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| author | Justin Ruggles <justin.ruggles@gmail.com> | 2007-07-14 15:56:55 +0000 |
|---|---|---|
| committer | Justin Ruggles <justin.ruggles@gmail.com> | 2007-07-14 15:56:55 +0000 |
| commit | 98a27a8a84186d9b6c662cf332472c364df36db1 (patch) | |
| tree | 2eb7f2cd6f292b351f5ea5bb61e94b999fe5b3fa /libavcodec/ac3dec.c | |
| parent | 41277578b93941bbf98b7820c5dbb9bdad49cffe (diff) | |
| download | ffmpeg-98a27a8a84186d9b6c662cf332472c364df36db1.tar.gz | |
AC-3 decoder, soc revision 38, Aug 7 00:03:00 2006 UTC by cloud9
major code cleanup.
correct implementation of imdct.
implemented imdct for block switching also.
when coupling is not in use all the
ac3 streams are decoded correctly.
but when coupling is in use there is a bug.
i am currently finding the root of the bug.
if anybody can help.
Originally committed as revision 9657 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/ac3dec.c')
| -rw-r--r-- | libavcodec/ac3dec.c | 1533 |
1 files changed, 833 insertions, 700 deletions
diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c index 53b0202d09..c26b8f6700 100644 --- a/libavcodec/ac3dec.c +++ b/libavcodec/ac3dec.c @@ -33,178 +33,27 @@ #include "dsputil.h" #include "avutil.h" #include "common.h" +#include "math.h" + +#define N 512 /* constant for IMDCT Block size */ #define MAX_CHANNELS 6 #define BLOCK_SIZE 256 #define AUDIO_BLOCKS 6 - -/* Synchronization information. */ -typedef struct { - uint16_t sync_word; //synchronization word = always 0x0b77 - uint16_t crc1; //crc for the first 5/8 of the frame - uint8_t fscod; //sampling rate code - uint8_t frmsizecod; //frame size code - - /* Derived Attributes */ - int sampling_rate; //sampling rate - 48, 44.1 or 32 kHz (value in Hz) - int bit_rate; //nominal bit rate (value in kbps) - int framesize; //frame size - 16 bit words -} ac3_sync_info; - -/* flags for the BSI. */ -#define AC3_BSI_LFEON 0x00000001 //low frequency effects channel on -#define AC3_BSI_COMPRE 0x00000002 //compression exists -#define AC3_BSI_LANGCODE 0x00000004 //langcode exists -#define AC3_BSI_AUDPRODIE 0x00000008 //audio production information exists -#define AC3_BSI_COMPR2E 0x00000010 //compr2 exists -#define AC3_BSI_LANGCOD2E 0x00000020 //langcod2 exists -#define AC3_BSI_AUDPRODI2E 0x00000040 //audio production information 2 exists -#define AC3_BSI_COPYRIGHTB 0x00000080 //copyright -#define AC3_BSI_ORIGBS 0x00000100 //original bit stream -#define AC3_BSI_TIMECOD1E 0x00000200 //timecod1 exists -#define AC3_BSI_TIMECOD2E 0x00000400 //timecod2 exists -#define AC3_BSI_ADDBSIE 0x00000800 //additional bit stream information exists - -/* Bit Stream Information. */ -typedef struct { - uint32_t flags; - uint8_t bsid; //bit stream identification - uint8_t bsmod; //bit stream mode - type of service - uint8_t acmod; //audio coding mode - which channels are in use - uint8_t cmixlev; //center mix level - uint8_t surmixlev; //surround mix level - uint8_t dsurmod; //dynamic surround encoded - uint8_t dialnorm; //dialog normalization - uint8_t compr; //compression gain word - uint8_t langcod; //language code - uint8_t mixlevel; //mixing level - uint8_t roomtyp; //room type - uint8_t dialnorm2; //dialogue normalization for 1+1 mode - uint8_t compr2; //compression gain word for 1+1 mode - uint8_t langcod2; //language code for 1+1 mode - uint8_t mixlevel2; //mixing level for 1+1 mode - uint8_t roomtyp2; //room type for 1+1 mode - uint16_t timecod1; //timecode 1 - uint16_t timecod2; //timecode 2 - uint8_t addbsil; //additional bit stream information length - - /* Dervied Attributes */ - int nfchans; //number of full bandwidth channels - derived from acmod -} ac3_bsi; - -/* #defs relevant to Audio Block. */ -#define MAX_FBW_CHANNELS 5 //maximum full bandwidth channels -#define NUM_LFE_GROUPS 3 //number of LFE Groups -#define MAX_NUM_SEGS 8 //maximum number of segments per delta bit allocation -#define NUM_LFE_MANTS 7 //number of lfe mantissas -#define MAX_CPL_SUBNDS 18 //maximum number of coupling sub bands -#define MAX_CPL_BNDS 18 //maximum number of coupling bands -#define MAX_CPL_GRPS 253 //maximum number of coupling groups -#define MAX_CHNL_GRPS 88 //maximum number of channel groups -#define MAX_NUM_MANTISSAS 256 //maximum number of mantissas - -/* flags for the Audio Block. */ -#define AC3_AB_DYNRNGE 0x00000001 //dynamic range control exists -#define AC3_AB_DYNRNG2E 0x00000002 //dynamic range control 2 exists -#define AC3_AB_CPLSTRE 0x00000004 //coupling strategy exists -#define AC3_AB_CPLINU 0x00000008 //coupling in use -#define AC3_AB_PHSFLGINU 0x00000010 //phase flag in use -#define AC3_AB_REMATSTR 0x00000020 //rematrixing required -#define AC3_AB_LFEEXPSTR 0x00000100 //lfe exponent strategy -#define AC3_AB_BAIE 0x00000200 //bit allocation information exists -#define AC3_AB_SNROFFSTE 0x00000400 //SNR offset exists -#define AC3_AB_CPLLEAKE 0x00000800 //coupling leak initialization exists -#define AC3_AB_DELTBAIE 0x00001000 //delta bit allocation information exists -#define AC3_AB_SKIPLE 0x00002000 //skip length exists - /* Exponent strategies. */ #define AC3_EXPSTR_D15 0x01 #define AC3_EXPSTR_D25 0x02 #define AC3_EXPSTR_D45 0x03 #define AC3_EXPSTR_REUSE 0x00 -/* Bit allocation strategies */ +/* Bit allocation strategies. */ #define AC3_DBASTR_NEW 0x01 #define AC3_DBASTR_NONE 0x02 #define AC3_DBASTR_RESERVED 0x03 #define AC3_DBASTR_REUSE 0x00 -/* Audio Block */ -typedef struct { - uint32_t flags; - uint8_t blksw; //block switch flags for channels in use - uint8_t dithflag; //dithering flags for channels in use - int8_t dynrng; //dynamic range word - int8_t dynrng2; //dynamic range word for 1+1 mode - uint8_t chincpl; //channel in coupling flags for channels in use - uint8_t cplbegf; //coupling begin frequency code - uint8_t cplendf; //coupling end frequency code - uint32_t cplbndstrc; //coupling band structure - uint8_t cplcoe; //coupling co-ordinates exists for the channel in use - uint32_t phsflg; //phase flag per band - uint8_t rematflg; //rematrixing flag - uint8_t cplexpstr; //coupling exponent strategy - uint8_t chexpstr[5]; //channel exponent strategy - uint8_t lfeexpstr; //lfe exponent strategy - uint8_t chbwcod[5]; //channel bandwdith code for channels in use - uint8_t cplabsexp; //coupling absolute exponent - uint8_t gainrng[5]; //gain range - uint8_t sdcycod; //slow decay code - uint8_t fdcycod; //fast decay code - uint8_t sgaincod; //slow gain code - uint8_t dbpbcod; //dB per bit code - uint8_t floorcod; //masking floor code - uint8_t csnroffst; //coarse SNR offset - uint8_t cplfsnroffst; //coupling fine SNR offset - uint8_t cplfgaincod; //coupling fast gain code - uint8_t fsnroffst[5]; //fine SNR offset for channels in use - uint8_t fgaincod[5]; //fast gain code for channels in use - uint8_t lfefsnroffst; //lfe fine SNR offset - uint8_t lfefgaincod; //lfe fast gain code - uint8_t cplfleak; //coupling fast leak initialization value - uint8_t cplsleak; //coupling slow leak initialization value - uint8_t cpldeltbae; //coupling delta bit allocation exists - uint8_t deltbae[5]; //delta bit allocation exists for channels in use - uint8_t cpldeltnseg; //coupling delta bit allocation number of segments - uint8_t cpldeltoffst[8]; //coupling delta offset - uint8_t cpldeltlen[8]; //coupling delta len - uint8_t cpldeltba[8]; //coupling delta bit allocation - uint8_t deltnseg[5]; //delta bit allocation number of segments per channel - uint8_t deltoffst[5][8]; //delta offset for channels in use - uint8_t deltlen[5][8]; //delta len for channels in use - uint8_t deltba[5][8]; //delta bit allocation - uint16_t skipl; //skip length - - /* Derived Attributes */ - int ncplsubnd; //number of active coupling sub bands = 3 + cplendf - cplbegf - int ncplbnd; //derived from ncplsubnd and cplbndstrc - int ncplgrps; //derived from ncplsubnd, cplexpstr - int nchgrps[5]; //derived from chexpstr, and cplbegf or chbwcod - int ncplmant; //derived from ncplsubnd = 12 * ncplsubnd - - uint8_t cplstrtmant; //coupling start mantissa - uint8_t cplendmant; //coupling end mantissa - uint8_t endmant[5]; //channel end mantissas - - uint8_t dcplexps[256]; //decoded coupling exponents - uint8_t dexps[5][256]; //decoded fbw channel exponents - uint8_t dlfeexps[256]; //decoded lfe exponents - uint8_t cplbap[256]; //coupling bit allocation parameters table - uint8_t bap[5][256]; //fbw channels bit allocation parameters table - uint8_t lfebap[256]; //lfe bit allocaiton parameters table - - DECLARE_ALIGNED_16(float, transform_coeffs[MAX_CHANNELS][BLOCK_SIZE]); //transform coefficients - DECLARE_ALIGNED_16(float, output[MAX_CHANNELS][BLOCK_SIZE]); //output of the block - DECLARE_ALIGNED_16(float, delay[MAX_CHANNELS][BLOCK_SIZE]); //delay (for overlap and add) - DECLARE_ALIGNED_16(float, tmp_imdct[BLOCK_SIZE]); //temporary storage for ff_imdct_calc - DECLARE_ALIGNED_16(float, tmp_output[BLOCK_SIZE * 2]); //output of ff_imdct_calc - float cplco[5][18]; //coupling coordinates - float chcoeffs[6]; //channel coefficients for downmix -} ac3_audio_block; - - - +/* Output and input configurations. */ #define AC3_OUTPUT_UNMODIFIED 0x01 #define AC3_OUTPUT_MONO 0x02 #define AC3_OUTPUT_STEREO 0x04 @@ -220,25 +69,116 @@ typedef struct { #define AC3_INPUT_2F_2R 0x06 #define AC3_INPUT_3F_2R 0x07 -/* BEGIN Mersenne Twister Code. */ -#define N 624 -#define M 397 +/* Mersenne Twister */ +#define NMT 624 +#define MMT 397 #define MATRIX_A 0x9908b0df #define UPPER_MASK 0x80000000 #define LOWER_MASK 0x7fffffff + typedef struct { - uint32_t mt[N]; + uint32_t mt[NMT]; int mti; } dither_state; +/* Mersenne Twister */ + +typedef struct { + uint32_t flags; + uint16_t crc1; + uint8_t fscod; + + uint8_t acmod; + uint8_t cmixlev; + uint8_t surmixlev; + uint8_t dsurmod; + + uint8_t blksw; + uint8_t dithflag; + uint8_t cplinu; + uint8_t chincpl; + uint8_t phsflginu; + uint8_t cplbegf; + uint8_t cplendf; + uint8_t cplcoe; + uint32_t cplbndstrc; + uint8_t rematstr; + uint8_t rematflg; + uint8_t cplexpstr; + uint8_t lfeexpstr; + uint8_t chexpstr[5]; + uint8_t sdcycod; + uint8_t fdcycod; + uint8_t sgaincod; + uint8_t dbpbcod; + uint8_t floorcod; + uint8_t csnroffst; + uint8_t cplfsnroffst; + uint8_t cplfgaincod; + uint8_t fsnroffst[5]; + uint8_t fgaincod[5]; + uint8_t lfefsnroffst; + uint8_t lfefgaincod; + uint8_t cplfleak; + uint8_t cplsleak; + uint8_t cpldeltbae; + uint8_t deltbae[5]; + uint8_t cpldeltnseg; + uint8_t cpldeltoffst[8]; + uint8_t cpldeltlen[8]; + uint8_t cpldeltba[8]; + uint8_t deltnseg[5]; + uint8_t deltoffst[5][8]; + uint8_t deltlen[5][8]; + uint8_t deltba[5][8]; + + /* Derived Attributes. */ + int sampling_rate; + int bit_rate; + int frame_size; + + int nfchans; + int lfeon; + + float chcoeffs[6]; + float cplco[5][18]; + int ncplbnd; + int ncplsubnd; + int cplstrtmant; + int cplendmant; + int endmant[5]; + uint8_t dcplexps[256]; + uint8_t dexps[5][256]; + uint8_t dlfeexps[256]; + uint8_t cplbap[256]; + uint8_t bap[5][256]; + uint8_t lfebap[256]; + int blkoutput; + + DECLARE_ALIGNED_16(float, transform_coeffs[MAX_CHANNELS][BLOCK_SIZE]); + + /* For IMDCT. */ + FFTContext fft_64; //N/8 point IFFT context + FFTContext fft_128; //N/4 point IFFT context + DECLARE_ALIGNED_16(float, output[MAX_CHANNELS][BLOCK_SIZE]); + DECLARE_ALIGNED_16(float, delay[MAX_CHANNELS][BLOCK_SIZE]); + DECLARE_ALIGNED_16(float, tmp_imdct[BLOCK_SIZE]); + DECLARE_ALIGNED_16(float, tmp_output[BLOCK_SIZE * 2]); + + /* Miscellaneous. */ + GetBitContext gb; + dither_state dith_state; +} AC3DecodeContext; + +/* BEGIN Mersenne Twister Code. */ static void dither_seed(dither_state *state, uint32_t seed) { if (seed == 0) seed = 0x1f2e3d4c; state->mt[0] = seed; - for (state->mti = 1; state->mti < N; state->mti++) + for (state->mti = 1; state->mti < NMT; state->mti++) state->mt[state->mti] = ((69069 * state->mt[state->mti - 1]) + 1); } @@ -248,17 +188,17 @@ static uint32_t dither_uint32(dither_state *state) static const uint32_t mag01[2] = { 0x00, MATRIX_A }; int kk; - if (state->mti >= N) { - for (kk = 0; kk < N - M; kk++) { + if (state->mti >= NMT) { + for (kk = 0; kk < NMT - MMT; kk++) { y = (state->mt[kk] & UPPER_MASK) | (state->mt[kk + 1] & LOWER_MASK); - state->mt[kk] = state->mt[kk + M] ^ (y >> 1) ^ mag01[y & 0x01]; + state->mt[kk] = state->mt[kk + MMT] ^ (y >> 1) ^ mag01[y & 0x01]; } - for (;kk < N - 1; kk++) { + for (;kk < NMT - 1; kk++) { y = (state->mt[kk] & UPPER_MASK) | (state->mt[kk + 1] & LOWER_MASK); - state->mt[kk] = state->mt[kk + (M - N)] ^ (y >> 1) ^ mag01[y & 0x01]; + state->mt[kk] = state->mt[kk + (MMT - NMT)] ^ (y >> 1) ^ mag01[y & 0x01]; } - y = (state->mt[N - 1] & UPPER_MASK) | (state->mt[0] & LOWER_MASK); - state->mt[N - 1] = state->mt[M - 1] ^ (y >> 1) ^ mag01[y & 0x01]; + y = (state->mt[NMT - 1] & UPPER_MASK) | (state->mt[0] & LOWER_MASK); + state->mt[NMT - 1] = state->mt[MMT - 1] ^ (y >> 1) ^ mag01[y & 0x01]; state->mti = 0; } @@ -279,21 +219,61 @@ static inline int16_t dither_int16(dither_state *state) /* END Mersenne Twister */ -/* AC3 Context. */ -typedef struct { - ac3_sync_info sync_info; - ac3_bsi bsi; - ac3_audio_block audio_block; - dither_state state; - MDCTContext imdct_ctx_256; - MDCTContext imdct_ctx_512; - GetBitContext gb; - int output; -} AC3DecodeContext; +static void generate_quantizers_table(int16_t quantizers[], int level, int length) +{ + int i; + + for (i = 0; i < length; i++) + quantizers[i] = ((2 * i - level + 1) << 15) / level; +} + +static void generate_quantizers_table_1(int16_t quantizers[], int level, int length1, int length2, int size) +{ + int i, j; + int16_t v; + + for (i = 0; i < length1; i++) { + v = ((2 * i - level + 1) << 15) / level; + for (j = 0; j < length2; j++) + quantizers[i * length2 + j] = v; + } + + for (i = length1 * length2; i < size; i++) + quantizers[i] = 0; +} + +static void generate_quantizers_table_2(int16_t quantizers[], int level, int length1, int length2, int size) +{ + int i, j; + int16_t v; + + for (i = 0; i < length1; i++) { + v = ((2 * (i % level) - level + 1) << 15) / level; + for (j = 0; j < length2; j++) + quantizers[i * length2 + j] = v; + } + + for (i = length1 * length2; i < size; i++) + quantizers[i] = 0; + +} + +static void generate_quantizers_table_3(int16_t quantizers[], int level, int length1, int length2, int size) +{ + int i, j; + + for (i = 0; i < length1; i++) + for (j = 0; j < length2; j++) + quantizers[i * length2 + j] = ((2 * (j % level) - level + 1) << 15) / level; -static void ac3_common_init1(void) + for (i = length1 * length2; i < size; i++) + quantizers[i] = 0; +} + +static void ac3_tables_init(void) { int i, j, k, l, v; + float alpha; /* compute bndtab and masktab from bandsz */ k = 0; l = 0; @@ -305,21 +285,74 @@ static void ac3_common_init1(void) } masktab[253] = masktab[254] = masktab[255] = 0; bndtab[50] = 0; + + /* Exponent Decoding Tables */ + for (i = 0; i < 5; i++) { + v = i - 2; + for (j = 0; j < 25; j++) + exp_1[i * 25 + j] = v; + } + + for (i = 0; i < 25; i++) { + v = (i % 5) - 2; + for (j = 0; j < 5; j++) + exp_2[i * 5 + j] = v; + } + + for (i = 0; i < 25; i++) { + v = -2; + for (j = 0; j < 5; j++) + exp_3[i * 5 + j] = v++; + } + + for (i = 125; i < 128; i++) + exp_1[i] = exp_2[i] = exp_3[i] = 25; + /* End Exponent Decoding Tables */ + + /* Quantizer ungrouping tables. */ + // for level-3 quantizers + generate_quantizers_table_1(l3_quantizers_1, 3, 3, 9, 32); + generate_quantizers_table_2(l3_quantizers_2, 3, 9, 3, 32); + generate_quantizers_table_3(l3_quantizers_3, 3, 9, 3, 32); + + //for level-5 quantizers + generate_quantizers_table_1(l5_quantizers_1, 5, 5, 25, 128); + generate_quantizers_table_2(l5_quantizers_2, 5, 25, 5, 128); + generate_quantizers_table_3(l5_quantizers_3, 5, 25, 5, 128); + + //for level-7 quantizers + generate_quantizers_table(l7_quantizers, 7, 7); + + //for level-4 quantizers + generate_quantizers_table_2(l11_quantizers_1, 11, 11, 11, 128); + generate_quantizers_table_3(l11_quantizers_2, 11, 11, 11, 128); + + //for level-15 quantizers + generate_quantizers_table(l15_quantizers, 15, 15); + + /* Twiddle Factors for IMDCT. */ + for(i = 0; i < N / 4; i++) { + alpha = 2 * M_PI * (8 * i + 1) / (8 * N); + x_cos1[i] = -cos(alpha); + x_sin1[i] = -sin(alpha); + } + + for (i = 0; i < N / 8; i++) { + alpha = 2 * M_PI * (8 * i + 1) / (4 * N); + x_cos2[i] = -cos(alpha); + x_sin2[i] = -sin(alpha); + } } static int ac3_decode_init(AVCodecContext *avctx) { AC3DecodeContext *ctx = avctx->priv_data; - int i; - - ac3_common_init1(); - ff_mdct_init(&ctx->imdct_ctx_256, 8, 1); - ff_mdct_init(&ctx->imdct_ctx_512, 9, 1); - dither_seed(&ctx->state, 0); - for (i = 0; i < MAX_CHANNELS; i++) - memset(ctx->audio_block.delay[i], 0, sizeof(ctx->audio_block.delay[i])); + ac3_tables_init(); + ff_fft_init(&ctx->fft_64, 6, 1); + ff_fft_init(&ctx->fft_128, 7, 1); + dither_seed(&ctx->dith_state, 0); return 0; } @@ -338,128 +371,99 @@ static int ac3_synchronize(uint8_t *buf, int buf_size) //Returns -1 when 'fscod' is not valid; static int ac3_parse_sync_info(AC3DecodeContext *ctx) { - ac3_sync_info *sync_info = &ctx->sync_info; - ac3_bsi *bsi = &ctx->bsi; GetBitContext *gb = &ctx->gb; + int frmsizecod, bsid; - sync_info->sync_word = get_bits(gb, 16); - sync_info->crc1 = get_bits(gb, 16); - sync_info->fscod = get_bits(gb, 2); - if (sync_info->fscod == 0x03) + memset (ctx, sizeof (AC3DecodeContext), 0); + + skip_bits(gb, 16); //skip the sync_word, sync_info->sync_word = get_bits(gb, 16); + ctx->crc1 = get_bits(gb, 16); + ctx->fscod = get_bits(gb, 2); + if (ctx->fscod == 0x03) return 0; - sync_info->frmsizecod = get_bits(gb, 6); - if (sync_info->frmsizecod >= 38) + frmsizecod = get_bits(gb, 6); + if (frmsizecod >= 38) return 0; - sync_info->sampling_rate = ac3_freqs[sync_info->fscod]; - sync_info->bit_rate = ac3_bitratetab[sync_info->frmsizecod >> 1]; + ctx->sampling_rate = ac3_freqs[ctx->fscod]; + ctx->bit_rate = ac3_bitratetab[frmsizecod >> 1]; /* we include it here in order to determine validity of ac3 frame */ - bsi->bsid = get_bits(gb, 5); - if (bsi->bsid > 0x08) + bsid = get_bits(gb, 5); + if (bsid > 0x08) return 0; - bsi->bsmod = get_bits(gb, 3); + skip_bits(gb, 3); //skip the bsmod, bsi->bsmod = get_bits(gb, 3); - switch (sync_info->fscod) { + switch (ctx->fscod) { case 0x00: - sync_info->framesize = 4 * sync_info->bit_rate; - return sync_info->framesize; + ctx->frame_size = 4 * ctx->bit_rate; + return ctx->frame_size; case 0x01: - sync_info->framesize = 2 * (320 * sync_info->bit_rate / 147 + (sync_info->frmsizecod & 1)); - return sync_info->framesize; + ctx->frame_size = 2 * (320 * ctx->bit_rate / 147 + (frmsizecod & 1)); + return ctx->frame_size; case 0x02: - sync_info->framesize = 6 * sync_info->bit_rate; - return sync_info->framesize; + ctx->frame_size = 6 * ctx->bit_rate; + return ctx->frame_size; } /* never reached */ return 0; } -//Returns -1 when -static int ac3_parse_bsi(AC3DecodeContext *ctx) +static void ac3_parse_bsi(AC3DecodeContext *ctx) { - ac3_bsi *bsi = &ctx->bsi; - uint32_t *flags = &bsi->flags; GetBitContext *gb = &ctx->gb; int i; - *flags = 0; - bsi->cmixlev = 0; - bsi->surmixlev = 0; - bsi->dsurmod = 0; - bsi->nfchans = 0; - ctx->audio_block.cpldeltbae = AC3_DBASTR_NONE; - ctx->audio_block.cpldeltnseg = 0; + ctx->cmixlev = 0; + ctx->surmixlev = 0; + ctx->dsurmod = 0; + ctx->nfchans = 0; + ctx->cpldeltbae = AC3_DBASTR_NONE; + ctx->cpldeltnseg = 0; for (i = 0; i < 5; i++) { - ctx->audio_block.deltbae[i] = AC3_DBASTR_NONE; - ctx->audio_block.deltnseg[i] = 0; + ctx->deltbae[i] = AC3_DBASTR_NONE; + ctx->deltnseg[i] = 0; } - bsi->acmod = get_bits(gb, 3); - if (bsi->acmod & 0x01 && bsi->acmod != 0x01) - bsi->cmixlev = get_bits(gb, 2); - if (bsi->acmod & 0x04) - bsi->surmixlev = get_bits(gb, 2); - if (bsi->acmod == 0x02) - bsi->dsurmod = get_bits(gb, 2); - if (get_bits1(gb)) - *flags |= AC3_BSI_LFEON; - bsi->dialnorm = get_bits(gb, 5); - if (get_bits1(gb)) { - *flags |= AC3_BSI_COMPRE; - bsi->compr = get_bits(gb, 8); - } - if (get_bits1(gb)) { - *flags |= AC3_BSI_LANGCODE; - bsi->langcod = get_bits(gb, 8); - } - if (get_bits1(gb)) { - *flags |= AC3_BSI_AUDPRODIE; - bsi->mixlevel = get_bits(gb, 5); - bsi->roomtyp = get_bits(gb, 2); - } - if (bsi->acmod == 0x00) { - bsi->dialnorm2 = get_bits(gb, 5); - if (get_bits1(gb)) { - *flags |= AC3_BSI_COMPR2E; - bsi->compr2 = get_bits(gb, 8); - } - if (get_bits1(gb)) { - *flags |= AC3_BSI_LANGCOD2E; - bsi->langcod2 = get_bits(gb, 8); - } - if (get_bits1(gb)) { - *flags |= AC3_BSI_AUDPRODIE; - bsi->mixlevel2 = get_bits(gb, 5); - bsi->roomtyp2 = get_bits(gb, 2); - } - } + ctx->acmod = get_bits(gb, 3); + ctx->nfchans = nfchans_tbl[ctx->acmod]; + + if (ctx->acmod & 0x01 && ctx->acmod != 0x01) + ctx->cmixlev = get_bits(gb, 2); + if (ctx->acmod & 0x04) + ctx->surmixlev = get_bits(gb, 2); + if (ctx->acmod == 0x02) + ctx->dsurmod = get_bits(gb, 2); + + ctx->lfeon = get_bits1(gb); + + i = !(ctx->acmod); + do { + skip_bits(gb, 5); //skip dialog normalization + if (get_bits1(gb)) + skip_bits(gb, 8); //skip compression + if (get_bits1(gb)) + skip_bits(gb, 8); //skip language code + if (get_bits1(gb)) + skip_bits(gb, 7); //skip audio production information + } while (i--); + + skip_bits(gb, 2); //skip copyright bit and original bitstream bit + if (get_bits1(gb)) - *flags |= AC3_BSI_COPYRIGHTB; + skip_bits(gb, 14); //skip timecode1 if (get_bits1(gb)) - *flags |= AC3_BSI_ORIGBS; - if (get_bits1(gb)) { - *flags |= AC3_BSI_TIMECOD1E; - bsi->timecod1 = get_bits(gb, 14); - } - if (get_bits1(gb)) { - *flags |= AC3_BSI_TIMECOD2E; - bsi->timecod2 = get_bits(gb, 14); - } + skip_bits(gb, 14); //skip timecode2 + if (get_bits1(gb)) { - *flags |= AC3_BSI_ADDBSIE; - bsi->addbsil = get_bits(gb, 6); + i = get_bits(gb, 6); //additional bsi length do { skip_bits(gb, 8); - } while(bsi->addbsil--); + } while(i--); } - - bsi->nfchans = nfchans_tbl[bsi->acmod]; - - return 0; } - /* Decodes the grouped exponents and stores them +/* Decodes the grouped exponents and stores them * in decoded exponents (dexps). * The code is derived from liba52. * Uses liba52 tables. @@ -467,6 +471,7 @@ static int ac3_parse_bsi(AC3DecodeContext *ctx) static int decode_exponents(GetBitContext *gb, int expstr, int ngrps, uint8_t absexp, uint8_t *dexps) { int exps; + av_log(NULL, AV_LOG_INFO, "%d\n", ngrps); while (ngrps--) { exps = get_bits(gb, 7); @@ -560,39 +565,38 @@ static inline int calc_lowcomp(int a, int b0, int b1, int bin) */ static void do_bit_allocation1(AC3DecodeContext *ctx, int chnl) { - ac3_audio_block *ab = &ctx->audio_block; int sdecay, fdecay, sgain, dbknee, floor; int lowcomp = 0, fgain = 0, snroffset = 0, fastleak = 0, slowleak = 0; int psd[256], bndpsd[50], excite[50], mask[50], delta; int start = 0, end = 0, bin = 0, i = 0, j = 0, k = 0, lastbin = 0, bndstrt = 0; int bndend = 0, begin = 0, deltnseg = 0, band = 0, seg = 0, address = 0; - int fscod = ctx->sync_info.fscod; + int fscod = ctx->fscod; uint8_t *exps, *deltoffst = 0, *deltlen = 0, *deltba = 0; uint8_t *baps; int do_delta = 0; /* initialization */ - sdecay = sdecaytab[ab->sdcycod]; - fdecay = fdecaytab[ab->fdcycod]; - sgain = sgaintab[ab->sgaincod]; - dbknee = dbkneetab[ab->dbpbcod]; - floor = floortab[ab->floorcod]; + sdecay = sdecaytab[ctx->sdcycod]; + fdecay = fdecaytab[ctx->fdcycod]; + sgain = sgaintab[ctx->sgaincod]; + dbknee = dbkneetab[ctx->dbpbcod]; + floor = floortab[ctx->floorcod]; if (chnl == 5) { - start = ab->cplstrtmant; - end = ab->cplendmant; - fgain = fgaintab[ab->cplfgaincod]; - snroffset = (((ab->csnroffst - 15) << 4) + ab->cplfsnroffst) << 2; - fastleak = (ab->cplfleak << 8) + 768; - slowleak = (ab->cplsleak << 8) + 768; - exps = ab->dcplexps; - baps = ab->cplbap; - if (ab->cpldeltbae == AC3_DBASTR_NEW || ab->cpldeltbae == AC3_DBASTR_REUSE) { + start = ctx->cplstrtmant; + end = ctx->cplendmant; + fgain = fgaintab[ctx->cplfgaincod]; + snroffset = (((ctx->csnroffst - 15) << 4) + ctx->cplfsnroffst) << 2; + fastleak = (ctx->cplfleak << 8) + 768; + slowleak = (ctx->cplsleak << 8) + 768; + exps = ctx->dcplexps; + baps = ctx->cplbap; + if (ctx->cpldeltbae == AC3_DBASTR_NEW) { do_delta = 1; - deltnseg = ab->cpldeltnseg; - deltoffst = ab->cpldeltoffst; - deltlen = ab->cpldeltlen; - deltba = ab->cpldeltba; + deltnseg = ctx->cpldeltnseg; + deltoffst = ctx->cpldeltoffst; + deltlen = ctx->cpldeltlen; + deltba = ctx->cpldeltba; } } else if (chnl == 6) { @@ -601,27 +605,27 @@ static void do_bit_allocation1(AC3DecodeContext *ctx, int chnl) lowcomp = 0; fastleak = 0; slowleak = 0; - fgain = fgaintab[ab->lfefgaincod]; - snroffset = (((ab->csnroffst - 15) << 4) + ab->lfefsnroffst) << 2; - exps = ab->dlfeexps; - baps = ab->lfebap; + fgain = fgaintab[ctx->lfefgaincod]; + snroffset = (((ctx->csnroffst - 15) << 4) + ctx->lfefsnroffst) << 2; + exps = ctx->dlfeexps; + baps = ctx->lfebap; } else { start = 0; - end = ab->endmant[chnl]; + end = ctx->endmant[chnl]; lowcomp = 0; fastleak = 0; slowleak = 0; - fgain = fgaintab[ab->fgaincod[chnl]]; - snroffset = (((ab->csnroffst - 15) << 4) + ab->fsnroffst[chnl]) << 2; - exps = ab->dexps[chnl]; - baps = ab->bap[chnl]; - if (ab->deltbae[chnl] == AC3_DBASTR_NEW || ab->deltbae[chnl] == AC3_DBASTR_REUSE) { + fgain = fgaintab[ctx->fgaincod[chnl]]; + snroffset = (((ctx->csnroffst - 15) << 4) + ctx->fsnroffst[chnl]) << 2; + exps = ctx->dexps[chnl]; + baps = ctx->bap[chnl]; + if (ctx->deltbae[chnl] == AC3_DBASTR_NEW) { do_delta = 1; - deltnseg = ab->deltnseg[chnl]; - deltoffst = ab->deltoffst[chnl]; - deltlen = ab->deltlen[chnl]; - deltba = ab->deltba[chnl]; + deltnseg = ctx->deltnseg[chnl]; + deltoffst = ctx->deltoffst[chnl]; + deltlen = ctx->deltlen[chnl]; + deltba = ctx->deltba[chnl]; } } @@ -731,47 +735,48 @@ static void do_bit_allocation1(AC3DecodeContext *ctx, int chnl) static void do_bit_allocation(AC3DecodeContext *ctx, int flags) { - ac3_audio_block *ab = &ctx->audio_block; - int i, snroffst = 0; + int i, zerosnroffst = 1; if (!flags) /* bit allocation is not required */ return; - if (ab->flags & AC3_AB_SNROFFSTE) { /* check whether snroffsts are zero */ - snroffst += ab->csnroffst; - if (ab->flags & ab->chincpl) - snroffst += ab->cplfsnroffst; - for (i = 0; i < ctx->bsi.nfchans; i++) - snroffst += ab->fsnroffst[i]; - if (ctx->bsi.flags & AC3_BSI_LFEON) - snroffst += ab->lfefsnroffst; - if (!snroffst) { - memset(ab->cplbap, 0, sizeof (ab->cplbap)); - for (i = 0; i < ctx->bsi.nfchans; i++) - memset(ab->bap[i], 0, sizeof (ab->bap[i])); - memset(ab->lfebap, 0, sizeof (ab->lfebap)); - - return; - } + /* Check if snroffsets are zero. */ + if ((ctx->csnroffst) || (ctx->chincpl && ctx->cplfsnroffst) || + (ctx->lfeon && ctx->lfefsnroffst)) + zerosnroffst = 0; + if (zerosnroffst) + for (i = 0; i < ctx->nfchans; i++) + if (ctx->fsnroffst[i]) { + zerosnroffst = 0; + break; + } + + if (zerosnroffst) { + memset(ctx->cplbap, 0, sizeof (ctx->cplbap)); + for (i = 0; i < ctx->nfchans; i++) + memset(ctx->bap[i], 0, sizeof (ctx->bap[i])); + memset(ctx->lfebap, 0, sizeof (ctx->lfebap)); + return; } /* perform bit allocation */ - if (ab->chincpl && (flags & 64)) + if (ctx->cplinu && (flags & 64)) do_bit_allocation1(ctx, 5); - for (i = 0; i < ctx->bsi.nfchans; i++) + for (i = 0; i < ctx->nfchans; i++) if (flags & (1 << i)) do_bit_allocation1(ctx, i); - if ((ctx->bsi.flags & AC3_BSI_LFEON) && (flags & 32)) + if (ctx->lfeon && (flags & 32)) do_bit_allocation1(ctx, 6); } typedef struct { /* grouped mantissas for 3-level 5-leve and 11-level quantization */ - uint8_t gcodesl3[3]; - uint8_t gcodesl5[3]; - uint8_t gcodesl11[3]; + int16_t l3_quantizers[3]; + int16_t l5_quantizers[3]; + int16_t l11_quantizers[2]; int l3ptr; int l5ptr; int l11ptr; + int bits; } mant_groups; #define TRANSFORM_COEFF(tc, m, e, f) (tc) = (m) * (f)[(e)] @@ -783,91 +788,115 @@ typedef struct { /* grouped mantissas for 3-level 5-leve and 11-level quantizati */ static int get_transform_coeffs_cpling(AC3DecodeContext *ctx, mant_groups *m) { - ac3_audio_block *ab = &ctx->audio_block; GetBitContext *gb = &ctx->gb; - int sbnd, bin, ch, index, gcode; + int ch, bin, start, end, cplbndstrc, bnd, gcode, tbap; float cplcos[5], cplcoeff; - uint8_t *exps = ab->dcplexps; - uint8_t *bap = ab->cplbap; - - for (sbnd = ab->cplbegf; sbnd < ab->cplendf + 3; sbnd++) { - for (ch = 0; ch < ctx->bsi.nfchans; ch++) - cplcos[ch] = ab->chcoeffs[ch] * ab->cplco[ch][sbnd]; - for (bin = 0; bin < 12; bin++) { - index = sbnd * 12 + bin + 37; - switch(bap[index]) { + uint8_t *exps = ctx->dcplexps; + uint8_t *bap = ctx->cplbap; + + int bits_consumed = m->bits; + + cplbndstrc = ctx->cplbndstrc; + start = ctx->cplstrtmant; + bnd = 0; + + while (start < ctx->cplendmant) { + end = start + 12; + while (cplbndstrc & 1) { + end += 12; + cplbndstrc >>= 1; + } + cplbndstrc >>= 1; + for (ch = 0; ch < ctx->nfchans; ch++) + cplcos[ch] = ctx->chcoeffs[ch] * ctx->cplco[ch][bnd]; + bnd++; + + while (start < end) { + tbap = bap[start]; + switch(tbap) { case 0: - for (ch = 0; ch < ctx->bsi.nfchans; ctx++) - if (((ab->chincpl) >> ch) & 1) { - if (((ab->dithflag) >> ch) & 1) { - TRANSFORM_COEFF(cplcoeff, dither_int16(&ctx->state), exps[index], scale_factors); - ab->transform_coeffs[ch + 1][index] = cplcoeff * cplcos[ch]; + for (ch = 0; ch < ctx->nfchans; ctx++) + if (((ctx->chincpl) >> ch) & 1) { + if (((ctx->dithflag) >> ch) & 1) { + TRANSFORM_COEFF(cplcoeff, dither_int16(&ctx->dith_state), exps[start], scale_factors); + ctx->transform_coeffs[ch + 1][start] = cplcoeff * cplcos[ch]; } else - ab->transform_coeffs[ch + 1][index] = 0; + ctx->transform_coeffs[ch + 1][start] = 0; } + start++; continue; case 1: if (m->l3ptr > 2) { gcode = get_bits(gb, 5); - if (gcode > 26) - return -1; - m->gcodesl3[0] = gcode / 9; - m->gcodesl3[1] = (gcode % 9) / 3; - m->gcodesl3[2] = (gcode % 9) % 3; + /*if (gcode > 26) + return -1;*/ + m->l3_quantizers[0] = l3_quantizers_1[gcode]; + m->l3_quantizers[1] = l3_quantizers_2[gcode]; + m->l3_quantizers[2] = l3_quantizers_3[gcode]; m->l3ptr = 0; + m->bits += 5; } - TRANSFORM_COEFF(cplcoeff, l3_q_tab[m->gcodesl3[m->l3ptr++]], exps[index], scale_factors); + TRANSFORM_COEFF(cplcoeff, m->l3_quantizers[m->l3ptr++], exps[start], scale_factors); break; case 2: if (m->l5ptr > 2) { gcode = get_bits(gb, 7); - if (gcode > 124) - return -1; - m->gcodesl5[0] = gcode / 25; - m->gcodesl5[1] = (gcode % 25) / 5; - m->gcodesl5[2] = (gcode % 25) % 5; + /*if (gcode > 124) + return -1;*/ + m->l5_quantizers[0] = l5_quantizers_1[gcode]; + m->l5_quantizers[1] = l5_quantizers_2[gcode]; + m->l5_quantizers[2] = l5_quantizers_3[gcode]; m->l5ptr = 0; + m->bits += 7; } - TRANSFORM_COEFF(cplcoeff, l5_q_tab[m->gcodesl5[m->l5ptr++]], exps[index], scale_factors); + TRANSFORM_COEFF(cplcoeff, m->l5_quantizers[m->l5ptr++], exps[start], scale_factors); break; case 3: gcode = get_bits(gb, 3); - if (gcode > 6) - return -1; - TRANSFORM_COEFF(cplcoeff, l7_q_tab[gcode], exps[index], scale_factors); + /*if (gcode > 6) + return -1;*/ + m->bits += 3; + TRANSFORM_COEFF(cplcoeff, l7_quantizers[gcode], exps[start], scale_factors); break; case 4: if (m->l11ptr > 1) { gcode = get_bits(gb, 7); - if (gcode > 120) - return -1; - m->gcodesl11[0] = gcode / 11; - m->gcodesl11[1] = gcode % 11; + /*if (gcode > 120) + return -1;*/ + m->l11_quantizers[0] = l11_quantizers_1[gcode]; + m->l11_quantizers[1] = l11_quantizers_2[gcode]; m->l11ptr = 0; + m->bits += 7; } - TRANSFORM_COEFF(cplcoeff, l11_q_tab[m->gcodesl11[m->l11ptr++]], exps[index], scale_factors); + TRANSFORM_COEFF(cplcoeff, m->l11_quantizers[m->l11ptr++], exps[start], scale_factors); break; case 5: gcode = get_bits(gb, 4); - if (gcode > 14) - return -1; - TRANSFORM_COEFF(cplcoeff, l15_q_tab[gcode], exps[index], scale_factors); + /*if (gcode > 14) + return -1;*/ + m->bits += 4; + TRANSFORM_COEFF(cplcoeff, l15_quantizers[gcode], exps[start], scale_factors); break; default: - TRANSFORM_COEFF(cplcoeff, get_bits(gb, qntztab[bap[index]]) << (16 - qntztab[bap[index]]), - exps[index], scale_factors); + m->bits += qntztab[bap[bin]]; + TRANSFORM_COEFF(cplcoeff, get_bits(gb, qntztab[tbap]) << (16 - qntztab[tbap]), + exps[bin], scale_factors); } - for (ch = 0; ch < ctx->bsi.nfchans; ch++) - if (((ab->chincpl) >> ch) & 1) - ab->transform_coeffs[ch][index] = cplcoeff * cplcos[ch]; + for (ch = 0; ch < ctx->nfchans; ch++) + if ((ctx->chincpl >> ch) & 1) + ctx->transform_coeffs[ch][bin] = cplcoeff * cplcos[ch]; + start++; } } + bits_consumed = m->bits - bits_consumed; + av_log(NULL, AV_LOG_INFO, "\tbits consumed by coupling = %d\n", bits_consumed); + return 0; } @@ -878,13 +907,17 @@ static int get_transform_coeffs_ch(uint8_t *exps, uint8_t *bap, float chcoeff, { int i; int gcode; + int tbap; float factors[25]; + int bits_consumed = m->bits; + for (i = 0; i < 25; i++) factors[i] = scale_factors[i] * chcoeff; for (i = start; i < end; i++) { - switch (bap[i]) { + tbap = bap[i]; + switch (tbap) { case 0: if (!dith_flag) { coeffs[i] = 0; @@ -899,102 +932,115 @@ static int get_transform_coeffs_ch(uint8_t *exps, uint8_t *bap, float chcoeff, case 1: if (m->l3ptr > 2) { gcode = get_bits(gb, 5); - if (gcode > 26) - return -1; - m->gcodesl3[0] = gcode / 9; - m->gcodesl3[1] = (gcode % 9) / 3; - m->gcodesl3[2] = (gcode % 9) % 3; + /*if (gcode > 26) + return -1;*/ + m->l3_quantizers[0] = l3_quantizers_1[gcode]; + m->l3_quantizers[1] = l3_quantizers_2[gcode]; + m->l3_quantizers[2] = l3_quantizers_3[gcode]; m->l3ptr = 0; + m->bits += 5; } - TRANSFORM_COEFF(coeffs[i], l3_q_tab[m->gcodesl3[m->l3ptr++]], exps[i], factors); + TRANSFORM_COEFF(coeffs[i], m->l3_quantizers[m->l3ptr++], exps[i], factors); continue; case 2: if (m->l5ptr > 2) { gcode = get_bits(gb, 7); - if (gcode > 124) - return -1; - m->gcodesl5[0] = gcode / 25; - m->gcodesl5[1] = (gcode % 25) / 5; - m->gcodesl5[2] = (gcode % 25) % 5; + /*if (gcode > 124) + return -1;*/ + m->l5_quantizers[0] = l5_quantizers_1[gcode]; + m->l5_quantizers[1] = l5_quantizers_2[gcode]; + m->l5_quantizers[2] = l5_quantizers_3[gcode]; m->l5ptr = 0; + m->bits += 7; } - TRANSFORM_COEFF(coeffs[i], l5_q_tab[m->gcodesl5[m->l5ptr++]], exps[i], factors); + TRANSFORM_COEFF(coeffs[i], m->l5_quantizers[m->l5ptr++], exps[i], factors); continue; case 3: gcode = get_bits(gb, 3); - if (gcode > 6) - return -1; - TRANSFORM_COEFF(coeffs[i], l7_q_tab[gcode], exps[i], factors); + /*if (gcode > 6) + return -1; */ + m->bits += 3; + TRANSFORM_COEFF(coeffs[i], l7_quantizers[gcode], exps[i], factors); continue; case 4: if (m->l11ptr > 1) { gcode = get_bits(gb, 7); - if (gcode > 120) - return -1; - m->gcodesl11[0] = gcode / 11; - m->gcodesl11[1] = gcode % 11; + /*if (gcode > 120) + return -1;*/ + m->l11_quantizers[0] = l11_quantizers_1[gcode]; + m->l11_quantizers[1] = l11_quantizers_2[gcode]; m->l11ptr = 0; + m->bits += 7; } - TRANSFORM_COEFF(coeffs[i], l11_q_tab[m->gcodesl11[m->l11ptr++]], exps[i], factors); + TRANSFORM_COEFF(coeffs[i], m->l11_quantizers[m->l11ptr++], exps[i], factors); continue; case 5: gcode = get_bits(gb, 4); - if (gcode > 14) - return -1; - TRANSFORM_COEFF(coeffs[i], l15_q_tab[gcode], exps[i], factors); + /*if (gcode > 14) + return -1;*/ + m->bits += 4; + TRANSFORM_COEFF(coeffs[i], l15_quantizers[gcode], exps[i], factors); continue; default: - TRANSFORM_COEFF(coeffs[i], get_bits(gb, qntztab[bap[i]]) << (16 - qntztab[bap[i]]), exps[i], factors); + m->bits += qntztab[bap[i]]; + TRANSFORM_COEFF(coeffs[i], get_bits(gb, qntztab[tbap]) << (16 - qntztab[tbap]), exps[i], factors); continue; } } + bits_consumed = m->bits - bits_consumed; + av_log(NULL, AV_LOG_INFO, "\tbits consumed by channel = %d\n", bits_consumed); + return 0; } static int get_transform_coeffs(AC3DecodeContext * ctx) { int i, end; - ac3_audio_block *ab = &ctx->audio_block; int got_cplchan = 0; int dithflag = 0; mant_groups m; m.l3ptr = m.l5ptr = m.l11ptr = 3; + m.bits = 0; - for (i = 0; i < ctx->bsi.nfchans; i++) { - dithflag = ab->dithflag & (1 << i); + for (i = 0; i < ctx->nfchans; i++) { + dithflag = (ctx->dithflag >> i) & 1; /* transform coefficients for individual channel */ - if (get_transform_coeffs_ch(ab->dexps[i], ab->bap[i], ab->chcoeffs[i], ab->transform_coeffs[i + 1], - 0, ab->endmant[i], dithflag, &ctx->gb, &ctx->state, &m)) + if (get_transform_coeffs_ch(ctx->dexps[i], ctx->bap[i], ctx->chcoeffs[i], ctx->transform_coeffs[i + 1], + 0, ctx->endmant[i], dithflag, &ctx->gb, &ctx->dith_state, &m)) return -1; /* tranform coefficients for coupling channels */ - if (((ab->chincpl) >> i & 1)) { + if ((ctx->chincpl >> i) & 1) { if (!got_cplchan) { - if (get_transform_coeffs_cpling(ctx, &m)) + if (get_transform_coeffs_cpling(ctx, &m)) { + av_log(NULL, AV_LOG_ERROR, "error in decoupling channels\n"); return -1; + } got_cplchan = 1; } - end = ab->cplendmant; + end = ctx->cplendmant; } else - end = ab->endmant[i]; + end = ctx->endmant[i]; do - ab->transform_coeffs[i + 1][end] = 0; + ctx->transform_coeffs[i + 1][end] = 0; while(++end < 256); } - if (ctx->bsi.flags & AC3_BSI_LFEON) { - if (get_transform_coeffs_ch(ab->dlfeexps, ab->lfebap, 1.0f, ab->transform_coeffs[0], 0, 7, 0, &ctx->gb, &ctx->state, &m)) + if (ctx->lfeon) { + if (get_transform_coeffs_ch(ctx->dlfeexps, ctx->lfebap, 1.0f, ctx->transform_coeffs[0], 0, 7, 0, &ctx->gb, &ctx->dith_state, &m)) return -1; for (i = 7; i < 256; i++) { - ab->transform_coeffs[0][i] = 0; + ctx->transform_coeffs[0][i] = 0; } } + av_log(NULL, AV_LOG_INFO, "bits consumed by get_transform_coeffs = %d\n", m.bits); + return 0; } @@ -1003,31 +1049,30 @@ static void do_rematrixing1(AC3DecodeContext *ctx, int start, int end) float tmp0, tmp1; while (start < end) { - tmp0 = ctx->audio_block.transform_coeffs[1][start]; - tmp1 = ctx->audio_block.transform_coeffs[2][start]; - ctx->audio_block.transform_coeffs[1][start] = tmp0 + tmp1; - ctx->audio_block.transform_coeffs[2][start] = tmp0 - tmp1; + tmp0 = ctx->transform_coeffs[1][start]; + tmp1 = ctx->transform_coeffs[2][start]; + ctx->transform_coeffs[1][start] = tmp0 + tmp1; + ctx->transform_coeffs[2][start] = tmp0 - tmp1; start++; } } static void do_rematrixing(AC3DecodeContext *ctx) { - ac3_audio_block *ab = &ctx->audio_block; uint8_t bnd1 = 13, bnd2 = 25, bnd3 = 37, bnd4 = 61; uint8_t bndend; - bndend = FFMIN(ab->endmant[0], ab->endmant[1]); - if (ab->rematflg & 1) + bndend = FFMIN(ctx->endmant[0], ctx->endmant[1]); + if (ctx->rematflg & 1) do_rematrixing1(ctx, bnd1, bnd2); - if (ab->rematflg & 2) + if (ctx->rematflg & 2) do_rematrixing1(ctx, bnd2, bnd3); - if (ab->rematflg & 4) { - if (ab->cplbegf > 0 && ab->cplbegf <= 2 && (ab->chincpl)) + if (ctx->rematflg & 4) { + if (ctx->cplbegf > 0 && ctx->cplbegf <= 2 && (ctx->chincpl)) do_rematrixing1(ctx, bnd3, bndend); else { do_rematrixing1(ctx, bnd3, bnd4); - if (ab->rematflg & 8) + if (ctx->rematflg & 8) do_rematrixing1(ctx, bnd4, bndend); } } @@ -1035,11 +1080,10 @@ static void do_rematrixing(AC3DecodeContext *ctx) static void get_downmix_coeffs(AC3DecodeContext *ctx) { - int from = ctx->bsi.acmod; - int to = ctx->output; - float clev = clevs[ctx->bsi.cmixlev]; - float slev = slevs[ctx->bsi.surmixlev]; - ac3_audio_block *ab = &ctx->audio_block; + int from = ctx->acmod; + int to = ctx->blkoutput; + float clev = clevs[ctx->cmixlev]; + float slev = slevs[ctx->surmixlev]; if (to == AC3_OUTPUT_UNMODIFIED) return; @@ -1049,107 +1093,107 @@ static void get_downmix_coeffs(AC3DecodeContext *ctx) switch (to) { case AC3_OUTPUT_MONO: case AC3_OUTPUT_STEREO: /* We Assume that sum of both mono channels is requested */ - ab->chcoeffs[0] *= LEVEL_MINUS_6DB; - ab->chcoeffs[1] *= LEVEL_MINUS_6DB; + ctx->chcoeffs[0] *= LEVEL_MINUS_6DB; + ctx->chcoeffs[1] *= LEVEL_MINUS_6DB; break; } break; case AC3_INPUT_MONO: switch (to) { case AC3_OUTPUT_STEREO: - ab->chcoeffs[0] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[0] *= LEVEL_MINUS_3DB; break; } break; case AC3_INPUT_STEREO: switch (to) { case AC3_OUTPUT_MONO: - ab->chcoeffs[0] *= LEVEL_MINUS_3DB; - ab->chcoeffs[1] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[0] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[1] *= LEVEL_MINUS_3DB; break; } break; case AC3_INPUT_3F: switch (to) { case AC3_OUTPUT_MONO: - ab->chcoeffs[0] *= LEVEL_MINUS_3DB; - ab->chcoeffs[2] *= LEVEL_MINUS_3DB; - ab->chcoeffs[1] *= clev * LEVEL_PLUS_3DB; + ctx->chcoeffs[0] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[2] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[1] *= clev * LEVEL_PLUS_3DB; break; case AC3_OUTPUT_STEREO: - ab->chcoeffs[1] *= clev; + ctx->chcoeffs[1] *= clev; break; } break; case AC3_INPUT_2F_1R: switch (to) { case AC3_OUTPUT_MONO: - ab->chcoeffs[0] *= LEVEL_MINUS_3DB; - ab->chcoeffs[1] *= LEVEL_MINUS_3DB; - ab->chcoeffs[2] *= slev * LEVEL_MINUS_3DB; + ctx->chcoeffs[0] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[1] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[2] *= slev * LEVEL_MINUS_3DB; break; case AC3_OUTPUT_STEREO: - ab->chcoeffs[2] *= slev * LEVEL_MINUS_3DB; + ctx->chcoeffs[2] *= slev * LEVEL_MINUS_3DB; break; case AC3_OUTPUT_DOLBY: - ab->chcoeffs[2] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[2] *= LEVEL_MINUS_3DB; break; } break; case AC3_INPUT_3F_1R: switch (to) { case AC3_OUTPUT_MONO: - ab->chcoeffs[0] *= LEVEL_MINUS_3DB; - ab->chcoeffs[2] *= LEVEL_MINUS_3DB; - ab->chcoeffs[1] *= clev * LEVEL_PLUS_3DB; - ab->chcoeffs[3] *= slev * LEVEL_MINUS_3DB; + ctx->chcoeffs[0] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[2] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[1] *= clev * LEVEL_PLUS_3DB; + ctx->chcoeffs[3] *= slev * LEVEL_MINUS_3DB; break; case AC3_OUTPUT_STEREO: - ab->chcoeffs[1] *= clev; - ab->chcoeffs[3] *= slev * LEVEL_MINUS_3DB; + ctx->chcoeffs[1] *= clev; + ctx->chcoeffs[3] *= slev * LEVEL_MINUS_3DB; break; case AC3_OUTPUT_DOLBY: - ab->chcoeffs[1] *= LEVEL_MINUS_3DB; - ab->chcoeffs[3] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[1] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[3] *= LEVEL_MINUS_3DB; break; } break; case AC3_INPUT_2F_2R: switch (to) { case AC3_OUTPUT_MONO: - ab->chcoeffs[0] *= LEVEL_MINUS_3DB; - ab->chcoeffs[1] *= LEVEL_MINUS_3DB; - ab->chcoeffs[2] *= slev * LEVEL_MINUS_3DB; - ab->chcoeffs[3] *= slev * LEVEL_MINUS_3DB; + ctx->chcoeffs[0] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[1] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[2] *= slev * LEVEL_MINUS_3DB; + ctx->chcoeffs[3] *= slev * LEVEL_MINUS_3DB; break; case AC3_OUTPUT_STEREO: - ab->chcoeffs[2] *= slev; - ab->chcoeffs[3] *= slev; + ctx->chcoeffs[2] *= slev; + ctx->chcoeffs[3] *= slev; break; case AC3_OUTPUT_DOLBY: - ab->chcoeffs[2] *= LEVEL_MINUS_3DB; - ab->chcoeffs[3] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[2] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[3] *= LEVEL_MINUS_3DB; break; } break; case AC3_INPUT_3F_2R: switch (to) { case AC3_OUTPUT_MONO: - ab->chcoeffs[0] *= LEVEL_MINUS_3DB; - ab->chcoeffs[2] *= LEVEL_MINUS_3DB; - ab->chcoeffs[1] *= clev * LEVEL_PLUS_3DB; - ab->chcoeffs[3] *= slev * LEVEL_MINUS_3DB; - ab->chcoeffs[4] *= slev * LEVEL_MINUS_3DB; + ctx->chcoeffs[0] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[2] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[1] *= clev * LEVEL_PLUS_3DB; + ctx->chcoeffs[3] *= slev * LEVEL_MINUS_3DB; + ctx->chcoeffs[4] *= slev * LEVEL_MINUS_3DB; break; case AC3_OUTPUT_STEREO: - ab->chcoeffs[1] *= clev; - ab->chcoeffs[3] *= slev; - ab->chcoeffs[4] *= slev; + ctx->chcoeffs[1] *= clev; + ctx->chcoeffs[3] *= slev; + ctx->chcoeffs[4] *= slev; break; case AC3_OUTPUT_DOLBY: - ab->chcoeffs[1] *= LEVEL_MINUS_3DB; - ab->chcoeffs[3] *= LEVEL_MINUS_3DB; - ab->chcoeffs[4] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[1] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[3] *= LEVEL_MINUS_3DB; + ctx->chcoeffs[4] *= LEVEL_MINUS_3DB; break; } break; @@ -1159,7 +1203,7 @@ static void get_downmix_coeffs(AC3DecodeContext *ctx) static inline void mix_dualmono_to_mono(AC3DecodeContext *ctx) { int i; - float (*output)[BLOCK_SIZE] = ctx->audio_block.output; + float (*output)[BLOCK_SIZE] = ctx->output; for (i = 0; i < 256; i++) output[1][i] += output[2][i]; @@ -1170,7 +1214,7 @@ static inline void mix_dualmono_to_stereo(AC3DecodeContext *ctx) { int i; float tmp; - float (*output)[BLOCK_SIZE] = ctx->audio_block.output; + float (*output)[BLOCK_SIZE] = ctx->output; for (i = 0; i < 256; i++) { tmp = output[1][i] + output[2][i]; @@ -1181,7 +1225,7 @@ static inline void mix_dualmono_to_stereo(AC3DecodeContext *ctx) static inline void upmix_mono_to_stereo(AC3DecodeContext *ctx) { int i; - float (*output)[BLOCK_SIZE] = ctx->audio_block.output; + float (*output)[BLOCK_SIZE] = ctx->output; for (i = 0; i < 256; i++) output[2][i] = output[1][i]; @@ -1190,7 +1234,7 @@ static inline void upmix_mono_to_stereo(AC3DecodeContext *ctx) static inline void mix_stereo_to_mono(AC3DecodeContext *ctx) { int i; - float (*output)[BLOCK_SIZE] = ctx->audio_block.output; + float (*output)[BLOCK_SIZE] = ctx->output; for (i = 0; i < 256; i++) output[1][i] += output[2][i]; @@ -1200,7 +1244,7 @@ static inline void mix_stereo_to_mono(AC3DecodeContext *ctx) static inline void mix_3f_to_mono(AC3DecodeContext *ctx) { int i; - float (*output)[BLOCK_SIZE] = ctx->audio_block.output; + float (*output)[BLOCK_SIZE] = ctx->output; for (i = 0; i < 256; i++) output[1][i] += (output[2][i] + output[3][i]); @@ -1211,7 +1255,7 @@ static inline void mix_3f_to_mono(AC3DecodeContext *ctx) static inline void mix_3f_to_stereo(AC3DecodeContext *ctx) { int i; - float (*output)[BLOCK_SIZE] = ctx->audio_block.output; + float (*output)[BLOCK_SIZE] = ctx->output; for (i = 0; i < 256; i++) { output[1][i] += output[2][i]; @@ -1223,7 +1267,7 @@ static inline void mix_3f_to_stereo(AC3DecodeContext *ctx) static inline void mix_2f_1r_to_mono(AC3DecodeContext *ctx) { int i; - float (*output)[BLOCK_SIZE] = ctx->audio_block.output; + float (*output)[BLOCK_SIZE] = ctx->output; for (i = 0; i < 256; i++) output[1][i] += (output[2][i] + output[3][i]); @@ -1235,7 +1279,7 @@ static inline void mix_2f_1r_to_mono(AC3DecodeContext *ctx) static inline void mix_2f_1r_to_stereo(AC3DecodeContext *ctx) { int i; - float (*output)[BLOCK_SIZE] = ctx->audio_block.output; + float (*output)[BLOCK_SIZE] = ctx->output; for (i = 0; i < 256; i++) { output[1][i] += output[2][i]; @@ -1247,7 +1291,7 @@ static inline void mix_2f_1r_to_stereo(AC3DecodeContext *ctx) static inline void mix_2f_1r_to_dolby(AC3DecodeContext *ctx) { int i; - float (*output)[BLOCK_SIZE] = ctx->audio_block.output; + float (*output)[BLOCK_SIZE] = ctx->output; for (i = 0; i < 256; i++) { output[1][i] -= output[3][i]; @@ -1259,7 +1303,7 @@ static inline void mix_2f_1r_to_dolby(AC3DecodeContext *ctx) static inline void mix_3f_1r_to_mono(AC3DecodeContext *ctx) { int i; - float (*output)[BLOCK_SIZE] = ctx->audio_block.output; + float (*output)[BLOCK_SIZE] = ctx->output; for (i = 0; i < 256; i++) output[1][i] = (output[2][i] + output[3][i] + output[4][i]); @@ -1271,7 +1315,7 @@ static inline void mix_3f_1r_to_mono(AC3DecodeContext *ctx) static inline void mix_3f_1r_to_stereo(AC3DecodeContext *ctx) { int i; - float (*output)[BLOCK_SIZE] = ctx->audio_block.output; + float (*output)[BLOCK_SIZE] = ctx->output; for (i = 0; i < 256; i++) { output[1][i] += (output[2][i] + output[4][i]); @@ -1284,7 +1328,7 @@ static inline void mix_3f_1r_to_stereo(AC3DecodeContext *ctx) static inline void mix_3f_1r_to_dolby(AC3DecodeContext *ctx) { int i; - float (*output)[BLOCK_SIZE] = ctx->audio_block.output; + float (*output)[BLOCK_SIZE] = ctx->output; for (i = 0; i < 256; i++) { output[1][i] += (output[2][i] - output[4][i]); @@ -1297,7 +1341,7 @@ static inline void mix_3f_1r_to_dolby(AC3DecodeContext *ctx) static inline void mix_2f_2r_to_mono(AC3DecodeContext *ctx) { int i; - float (*output)[BLOCK_SIZE] = ctx->audio_block.output; + float (*output)[BLOCK_SIZE] = ctx->output; for (i = 0; i < 256; i++) output[1][i] = (output[2][i] + output[3][i] + output[4][i]); @@ -1309,7 +1353,7 @@ static inline void mix_2f_2r_to_mono(AC3DecodeContext *ctx) static inline void mix_2f_2r_to_stereo(AC3DecodeContext *ctx) { int i; - float (*output)[BLOCK_SIZE] = ctx->audio_block.output; + float (*output)[BLOCK_SIZE] = ctx->output; for (i = 0; i < 256; i++) { output[1][i] += output[3][i]; @@ -1322,7 +1366,7 @@ static inline void mix_2f_2r_to_stereo(AC3DecodeContext *ctx) static inline void mix_2f_2r_to_dolby(AC3DecodeContext *ctx) { int i; - float (*output)[BLOCK_SIZE] = ctx->audio_block.output; + float (*output)[BLOCK_SIZE] = ctx->output; for (i = 0; i < 256; i++) { output[1][i] -= output[3][i]; @@ -1335,7 +1379,7 @@ static inline void mix_2f_2r_to_dolby(AC3DecodeContext *ctx) static inline void mix_3f_2r_to_mono(AC3DecodeContext *ctx) { int i; - float (*output)[BLOCK_SIZE] = ctx->audio_block.output; + float (*output)[BLOCK_SIZE] = ctx->output; for (i = 0; i < 256; i++) output[1][i] += (output[2][i] + output[3][i] + output[4][i] + output[5][i]); @@ -1348,7 +1392,7 @@ static inline void mix_3f_2r_to_mono(AC3DecodeContext *ctx) static inline void mix_3f_2r_to_stereo(AC3DecodeContext *ctx) { int i; - float (*output)[BLOCK_SIZE] = ctx->audio_block.output; + float (*output)[BLOCK_SIZE] = ctx->output; for (i = 0; i < 256; i++) { output[1][i] += (output[2][i] + output[4][i]); @@ -1362,7 +1406,7 @@ static inline void mix_3f_2r_to_stereo(AC3DecodeContext *ctx) static inline void mix_3f_2r_to_dolby(AC3DecodeContext *ctx) { int i; - float (*output)[BLOCK_SIZE] = ctx->audio_block.output; + float (*output)[BLOCK_SIZE] = ctx->output; for (i = 0; i < 256; i++) { output[1][i] += (output[2][i] - output[4][i] - output[5][i]); @@ -1375,8 +1419,8 @@ static inline void mix_3f_2r_to_dolby(AC3DecodeContext *ctx) static void do_downmix(AC3DecodeContext *ctx) { - int from = ctx->bsi.acmod; - int to = ctx->output; + int from = ctx->acmod; + int to = ctx->blkoutput; switch (from) { case AC3_INPUT_DUALMONO: @@ -1484,294 +1528,383 @@ static void dump_floats(const char *name, int prec, const float *tab, int n) av_log(NULL, AV_LOG_INFO, "\n"); } -static inline void overlap_and_add(float *tmp_output, float *delay, float *output) +#define CMUL(pre, pim, are, aim, bre, bim) \ +{\ + float _are = (are);\ + float _aim = (aim);\ + float _bre = (bre);\ + float _bim = (bim);\ + (pre) = _are * _bre - _aim * _bim;\ + (pim) = _are * _bim + _aim * _bre;\ +} + +static void do_imdct_256(FFTContext *fft_ctx, float *coeffs, float *output, + float *delay, float *tmp_imdct, float *tmp_output) { - int n; + int k, n2, n4, n8; + float x1[128], x2[128]; + FFTComplex *z1 = (FFTComplex *)tmp_imdct; + FFTComplex *z2 = (FFTComplex *)(tmp_imdct + 128); + + n2 = N / 2; + n4 = N / 4; + n8 = N / 8; + + for (k = 0; k < n4; k++) { + x1[k] = coeffs[2 * k]; + x2[k] = coeffs[2 * k + 1]; + } + + /* Pre IFFT Complex Multiply Step. */ + for (k = 0; k < n8; k++) { + CMUL(z1[k].re, z1[k].im, x1[n4 - 2 * k - 1], x1[2 * k], x_cos2[k], x_sin2[k]); + CMUL(z2[k].re, z2[k].im, x2[n4 - 2 * k - 1], x2[2 * k], x_cos2[k], x_sin2[k]); + } + + /* Permutation needed before calling ff_fft_calc. */ + ff_fft_permute(fft_ctx, z1); + ff_fft_permute(fft_ctx, z2); + + /* N/8 pointe complex IFFT. */ + ff_fft_calc(fft_ctx, z1); + ff_fft_calc(fft_ctx, z2); + + /* Post IFFT Complex Multiply Step. */ + for (k = 0; k < n8; k++) { + CMUL(z1[k].re, z1[k].im, z1[k].re, z1[k].im, x_cos2[k], x_sin2[k]); + CMUL(z2[k].re, z2[k].im, z2[k].re, z2[k].im, x_cos2[k], x_sin2[k]); + } + + /* Windowing and de-interleaving step. */ + for (k = 0; k < n8; k++) { + tmp_output[2 * k] = -z1[k].im * window[2 * k]; + tmp_output[2 * k + 1] = z1[n8 - k - 1].re * window[2 * k + 1]; + tmp_output[n4 + 2 * k] = -z1[k].re * window[n4 + 2 * k]; + tmp_output[n4 + 2 * k + 1] = z1[n8 - k - 1].im * window[n4 + 2 * k + 1]; + tmp_output[n2 + 2 * k] = -z2[k].re * window[n2 - 2 * k - 1]; + tmp_output[n2 + 2* k + 1] = z2[n8 - k - 1].im * window[n2 - 2 * k - 2]; + tmp_output[3 * n4 + 2 * k] = z2[k].im * window[n4 - 2 * k - 1] ; + tmp_output[3 * n4 + 2 * k + 1] = -z2[n8 - k - 1].re * window[n4 - 2 * k - 2] ; + } - for (n = 0; n < BLOCK_SIZE; n++) - output[n] = (tmp_output[n] * window[n] + delay[n] * window[255 - n]); - memcpy(delay, tmp_output + BLOCK_SIZE, BLOCK_SIZE * sizeof (float)); + /* Overlap and add step. */ + for (k = 0; k < n2; k++) { + output[k] = 2 * (tmp_output[k] + delay[k]); + delay[k] = tmp_output[n2 + k]; + } } +static void do_imdct_512(FFTContext *fft_ctx, float *coeffs, float *output, + float *delay, float *tmp_imdct, float *tmp_output) +{ + int k, n2, n4, n8; + FFTComplex *z = (FFTComplex *)tmp_imdct; + + n2 = N / 2; + n4 = N / 4; + n8 = N / 8; + + + /* Pre IFFT Complex Multiply Step. */ + for (k = 0; k < n4; k++) + CMUL(z[k].re, z[k].im, coeffs[n2 - 2 * k - 1], coeffs[2 * k], x_cos1[k], x_sin1[k]); + + /* Permutation needed before calling ff_fft_calc. */ + ff_fft_permute(fft_ctx, z); + + /* N/4 pointe complex IFFT. */ + ff_fft_calc(fft_ctx, z); + + /* Post IFFT Complex Multiply Step. */ + for (k = 0; k < n4; k++) + CMUL(z[k].re, z[k].im, z[k].re, z[k].im, x_cos1[k], x_sin1[k]); + + /* Windowing and de-interleaving step. */ + for (k = 0; k < n8; k++) { + tmp_output[2 * k] = -z[n8 + k].im * window[2 * k]; + tmp_output[2 * k + 1] = z[n8 - k - 1].re * window[2 * k + 1]; + tmp_output[n4 + 2 * k] = -z[k].re * window[n4 + 2 * k]; + tmp_output[n4 + 2 * k + 1] = z[n4 - k - 1].im * window[n4 + 2 * k + 1]; + tmp_output[n2 + 2 * k] = -z[n8 + k].re * window[n2 - 2 * k - 1]; + tmp_output[n2 + 2* k + 1] = z[n8 - k - 1].im * window[n2 - 2 * k - 2]; + tmp_output[3 * n4 + 2 * k] = z[k].im * window[n4 - 2 * k - 1] ; + tmp_output[3 * n4 + 2 * k + 1] = -z[n4 - k - 1].re * window[n4 - 2 * k - 2] ; + } + + /* Overlap and add step. */ + for (k = 0; k < n2; k++) { + output[k] = 2 * (tmp_output[k] + delay[k]); + delay[k] = tmp_output[n2 + k]; + } +} static inline void do_imdct(AC3DecodeContext *ctx) { - ac3_audio_block *ab = &ctx->audio_block; int i; - if (ctx->output & AC3_OUTPUT_LFEON) { - av_log(NULL, AV_LOG_INFO, "imdct lfe\n"); - ff_imdct_calc(&ctx->imdct_ctx_512, ab->tmp_output, ab->transform_coeffs[0], ab->tmp_imdct); - overlap_and_add(ab->tmp_output, ab->delay[0], ab->output[0]); + if (ctx->blkoutput & AC3_OUTPUT_LFEON) { + do_imdct_512(&ctx->fft_128, ctx->transform_coeffs[0], ctx->output[0], + ctx->delay[0], ctx->tmp_imdct, ctx->tmp_output); } - for (i = 0; i < ctx->bsi.nfchans + 1; i++) { - if (!(((ab->blksw) >> i) & 1)) { - //av_log(NULL, AV_LOG_INFO, "imdct channel %d - block switching not enabled\n", i); - ff_imdct_calc(&ctx->imdct_ctx_512, ab->tmp_output, ab->transform_coeffs[i + 1], ab->tmp_imdct); - overlap_and_add(ab->tmp_output, ab->delay[i + 1], ab->output[i + 1]); + for (i = 0; i < ctx->nfchans + 1; i++) { + if (!(((ctx->blksw) >> i) & 1)) { + do_imdct_512(&ctx->fft_128, ctx->transform_coeffs[i + 1], ctx->output[i + 1], + ctx->delay[i + 1], ctx->tmp_imdct, ctx->tmp_output); } else { - av_log(NULL, AV_LOG_INFO, "imdct channel %d skipping - block switching enabled\n", i); + do_imdct_256(&ctx->fft_64, ctx->transform_coeffs[i + 1], ctx->output[i + 1], + ctx->delay[i + 1], ctx->tmp_imdct, ctx->tmp_output); } } } -static int ac3_parse_audio_block(AC3DecodeContext * ctx, int index) +static int ac3_parse_audio_block(AC3DecodeContext * ctx) { - ac3_audio_block *ab = &ctx->audio_block; - int nfchans = ctx->bsi.nfchans; - int acmod = ctx->bsi.acmod; + int nfchans = ctx->nfchans; + int acmod = ctx->acmod; int i, bnd, rbnd, seg, grpsize; GetBitContext *gb = &ctx->gb; - uint32_t *flags = &ab->flags; int bit_alloc_flags = 0; float drange, tmpco; uint8_t *dexps; int mstrcplco, cplcoexp, cplcomant, sbnd, cplbndstrc; + int dynrng, chbwcod, ngrps, cplabsexp, skipl; - *flags = 0; - ab->blksw = 0; for (i = 0; i < 5; i++) - ab->chcoeffs[i] = 2.0; + ctx->chcoeffs[i] = 1.0; + for (i = 0; i < nfchans; i++) /*block switch flag */ - ab->blksw |= get_bits1(gb) << i; - ab->dithflag = 0; + ctx->blksw |= get_bits1(gb) << i; + for (i = 0; i < nfchans; i++) /* dithering flag */ - ab->dithflag |= get_bits1(gb) << i; + ctx->dithflag |= get_bits1(gb) << i; + if (get_bits1(gb)) { /* dynamic range */ - *flags |= AC3_AB_DYNRNGE; - ab->dynrng = get_bits(gb, 8); - drange = ((((ab->dynrng & 0x1f) | 0x20) << 13) * scale_factors[3 - (ab->dynrng >> 5)]); + dynrng = get_bits(gb, 8); + drange = ((((dynrng & 0x1f) | 0x20) << 13) * scale_factors[3 - (dynrng >> 5)]); for (i = 0; i < nfchans; i++) - ab->chcoeffs[i] *= drange; - } - if (acmod == 0x00) { /* dynamic range 1+1 mode */ - if (get_bits1(gb)) { - *flags |= AC3_AB_DYNRNG2E; - ab->dynrng2 = get_bits(gb, 8); - drange = ((((ab->dynrng2 & 0x1f) | 0x20) << 13) * scale_factors[3 - (ab->dynrng2 >> 5)]); - ab->chcoeffs[1] *= drange; - } + ctx->chcoeffs[i] *= drange; } + + if (acmod == 0x00 && get_bits1(gb)) { /* dynamic range 1+1 mode */ + dynrng = get_bits(gb, 8); + drange = ((((dynrng & 0x1f) | 0x20) << 13) * scale_factors[3 - (dynrng >> 5)]); + ctx->chcoeffs[1] *= drange; + } + get_downmix_coeffs(ctx); + if (get_bits1(gb)) { /* coupling strategy */ - *flags |= AC3_AB_CPLSTRE; - ab->cplbndstrc = 0; - ab->chincpl = 0; - if (get_bits1(gb)) { /* coupling in use */ - *flags |= AC3_AB_CPLINU; + ctx->cplinu = get_bits1(gb); + if (ctx->cplinu) { /* coupling in use */ + ctx->chincpl = 0; for (i = 0; i < nfchans; i++) - ab->chincpl |= get_bits1(gb) << i; + ctx->chincpl |= get_bits1(gb) << i; + + if (acmod == 0x00 || acmod == 0x01) //atleast two shared channels required + return -1; + if (acmod == 0x02) - if (get_bits1(gb)) /* phase flag in use */ - *flags |= AC3_AB_PHSFLGINU; - ab->cplbegf = get_bits(gb, 4); - ab->cplendf = get_bits(gb, 4); - if (3 + ab->cplendf - ab->cplbegf < 0) + ctx->phsflginu = get_bits1(gb); //phase flag in use + + ctx->cplbegf = get_bits(gb, 4); + ctx->cplendf = get_bits(gb, 4); + + if (3 + ctx->cplendf - ctx->cplbegf < 0) { + av_log(NULL, AV_LOG_ERROR, "cplendf = %d < cplbegf = %d\n", ctx->cplendf, ctx->cplbegf); return -1; - ab->ncplbnd = ab->ncplsubnd = 3 + ab->cplendf - ab->cplbegf; - ab->cplstrtmant = ab->cplbegf * 12 + 37; - ab->cplendmant = ab->cplendf * 12 + 73; - for (i = 0; i < ab->ncplsubnd - 1; i++) /* coupling band structure */ + } + + ctx->ncplbnd = ctx->ncplsubnd = 3 + ctx->cplendf - ctx->cplbegf; + ctx->cplstrtmant = ctx->cplbegf * 12 + 37; + ctx->cplendmant = ctx->cplendf * 12 + 73; + ctx->cplbndstrc = 0; + for (i = 0; i < ctx->ncplsubnd - 1; i++) /* coupling band structure */ if (get_bits1(gb)) { - ab->cplbndstrc |= 1 << i; - ab->ncplbnd--; + ctx->cplbndstrc |= 1 << i; + ctx->ncplbnd--; } } } - if (ab->chincpl) { - ab->cplcoe = 0; + + if (ctx->cplinu) { + ctx->cplcoe = 0; + for (i = 0; i < nfchans; i++) - if ((ab->chincpl) >> i & 1) + if ((ctx->chincpl) >> i & 1) if (get_bits1(gb)) { /* coupling co-ordinates */ - ab->cplcoe |= 1 << i; + ctx->cplcoe = 1; mstrcplco = 3 * get_bits(gb, 2); - sbnd = ab->cplbegf; - cplbndstrc = ab->cplbndstrc; - for (bnd = 0; bnd < ab->ncplbnd; bnd++) { + cplbndstrc = ctx->cplbndstrc; + for (bnd = 0; bnd < ctx->ncplbnd; bnd++) { cplcoexp = get_bits(gb, 4); cplcomant = get_bits(gb, 4); if (cplcoexp == 15) cplcomant <<= 14; else cplcomant = (cplcomant | 0x10) << 13; - tmpco = ab->cplco[i][sbnd++] = cplcomant * scale_factors[cplcoexp + mstrcplco]; - while (cplbndstrc & 1) { - ab->cplco[i][sbnd++] = tmpco; - cplbndstrc >>= 1; - } - cplbndstrc >>= 1; - } - } - ab->phsflg = 0; - if ((acmod == 0x02) && (*flags & AC3_AB_PHSFLGINU) && (ab->cplcoe & 1 || ab->cplcoe & (1 << 1))) { - sbnd = ab->cplbegf; - cplbndstrc = ab->cplbndstrc; - for (bnd = 0; bnd < ab->ncplbnd; bnd++) - if (get_bits1(gb)) { - ab->phsflg |= 1 << bnd; - ab->cplco[1][sbnd] = -ab->cplco[1][sbnd]; - sbnd++; - while (cplbndstrc & 1) { - ab->cplco[1][sbnd] = -ab->cplco[1][sbnd]; - sbnd++; - cplbndstrc >>= 1; - } - cplbndstrc >>= 1; - } else { - sbnd++; - while (cplbndstrc & 1) { - sbnd++; - cplbndstrc >>= 1; + ctx->cplco[i][bnd] = cplcomant * scale_factors[cplcoexp + mstrcplco]; } - cplbndstrc >>= 1; } - } + + if (acmod == 0x02 && ctx->phsflginu && ctx->cplcoe) + for (bnd = 0; bnd < ctx->ncplbnd; bnd++) + if (get_bits1(gb)) + ctx->cplco[1][bnd] = -ctx->cplco[1][bnd]; } - ab->rematflg = 0; - if (acmod == 0x02) /* rematrixing */ - if (get_bits1(gb)) { - *flags |= AC3_AB_REMATSTR; - if (!(ab->chincpl) || ab->cplbegf > 2) + + if (acmod == 0x02) {/* rematrixing */ + ctx->rematstr = get_bits1(gb); + if (ctx->rematstr) { + ctx->rematflg = 0; + + if (!(ctx->cplinu) || ctx->cplbegf > 2) for (rbnd = 0; rbnd < 4; rbnd++) - ab->rematflg |= get_bits1(gb) << rbnd; - if (ab->cplbegf > 0 && ab->cplbegf <= 2 && (ab->chincpl)) + ctx->rematflg |= get_bits1(gb) << rbnd; + if (ctx->cplbegf > 0 && ctx->cplbegf <= 2 && ctx->cplinu) for (rbnd = 0; rbnd < 3; rbnd++) - ab->rematflg |= get_bits1(gb) << rbnd; - if (ab->cplbegf == 0 && (ab->chincpl)) + ctx->rematflg |= get_bits1(gb) << rbnd; + if (ctx->cplbegf == 0 && ctx->cplinu) for (rbnd = 0; rbnd < 2; rbnd++) - ab->rematflg |= get_bits1(gb) << rbnd; + ctx->rematflg |= get_bits1(gb) << rbnd; } - ab->cplexpstr = AC3_EXPSTR_REUSE; - ab->lfeexpstr = AC3_EXPSTR_REUSE; - if (ab->chincpl) /* coupling exponent strategy */ - ab->cplexpstr = get_bits(gb, 2); - for (i = 0; i < nfchans; i++) /* channel exponent strategy */ - ab->chexpstr[i] = get_bits(gb, 2); - if (ctx->bsi.flags & AC3_BSI_LFEON) /* lfe exponent strategy */ - ab->lfeexpstr = get_bits1(gb); + } + + ctx->cplexpstr = AC3_EXPSTR_REUSE; + ctx->lfeexpstr = AC3_EXPSTR_REUSE; + if (ctx->cplinu) /* coupling exponent strategy */ + ctx->cplexpstr = get_bits(gb, 2); + for (i = 0; i < nfchans; i++) /* channel exponent strategy */ + ctx->chexpstr[i] = get_bits(gb, 2); + if (ctx->lfeon) /* lfe exponent strategy */ + ctx->lfeexpstr = get_bits1(gb); + for (i = 0; i < nfchans; i++) /* channel bandwidth code */ - if (ab->chexpstr[i] != AC3_EXPSTR_REUSE) { - if (((ab->chincpl) >> i) & 1) { - ab->endmant[i] = ab->cplstrtmant; - } + if (ctx->chexpstr[i] != AC3_EXPSTR_REUSE) { + if ((ctx->chincpl >> i) & 1) + ctx->endmant[i] = ctx->cplstrtmant; else { - ab->chbwcod[i] = get_bits(gb, 6); - if (ab->chbwcod[i] > 60) { - av_log(NULL, AV_LOG_ERROR, "chbwcod = %d > 60", ab->chbwcod[i]); + chbwcod = get_bits(gb, 6); + if (chbwcod > 60) { + av_log(NULL, AV_LOG_ERROR, "chbwcod = %d > 60", chbwcod); return -1; } - ab->endmant[i] = ab->chbwcod[i] * 3 + 73; + ctx->endmant[i] = chbwcod * 3 + 73; + av_log(NULL, AV_LOG_INFO, "i = %d \t chbwcod = %d \t endmant = %d\n", i, chbwcod, ctx->endmant[i]); } } - if (ab->cplexpstr != AC3_EXPSTR_REUSE) {/* coupling exponents */ + + if (ctx->cplexpstr != AC3_EXPSTR_REUSE) {/* coupling exponents */ bit_alloc_flags |= 64; - ab->cplabsexp = get_bits(gb, 4) << 1; - ab->ncplgrps = (ab->cplendmant - ab->cplstrtmant) / (3 << (ab->cplexpstr - 1)); - if (decode_exponents(gb, ab->cplexpstr, ab->ncplgrps, ab->cplabsexp, ab->dcplexps + ab->cplstrtmant)) { + cplabsexp = get_bits(gb, 4) << 1; + ngrps = (ctx->cplendmant - ctx->cplstrtmant) / (3 << (ctx->cplexpstr - 1)); + if (decode_exponents(gb, ctx->cplexpstr, ngrps, cplabsexp, ctx->dcplexps + ctx->cplstrtmant)) { av_log(NULL, AV_LOG_ERROR, "error decoding coupling exponents\n"); return -1; } } + for (i = 0; i < nfchans; i++) /* fbw channel exponents */ - if (ab->chexpstr[i] != AC3_EXPSTR_REUSE) { + if (ctx->chexpstr[i] != AC3_EXPSTR_REUSE) { bit_alloc_flags |= 1 << i; - grpsize = 3 << (ab->chexpstr[i] - 1); - ab->nchgrps[i] = (ab->endmant[i] + grpsize - 4) / grpsize; - dexps = ab->dexps[i]; + grpsize = 3 << (ctx->chexpstr[i] - 1); + ngrps = (ctx->endmant[i] + grpsize - 4) / grpsize; + dexps = ctx->dexps[i]; dexps[0] = get_bits(gb, 4); - if (decode_exponents(gb, ab->chexpstr[i], ab->nchgrps[i], dexps[0], dexps + 1)) { + if (decode_exponents(gb, ctx->chexpstr[i], ngrps, dexps[0], dexps + 1)) { av_log(NULL, AV_LOG_ERROR, "error decoding channel %d exponents\n", i); return -1; } - ab->gainrng[i] = get_bits(gb, 2); + skip_bits(gb, 2); /* skip gainrng */ } - if (ab->lfeexpstr != AC3_EXPSTR_REUSE) { /* lfe exponents */ + + if (ctx->lfeexpstr != AC3_EXPSTR_REUSE) { /* lfe exponents */ bit_alloc_flags |= 32; - ab->dlfeexps[0] = get_bits(gb, 4); - if (decode_exponents(gb, ab->lfeexpstr, 2, ab->dlfeexps[0], ab->dlfeexps + 1)) { + ctx->dlfeexps[0] = get_bits(gb, 4); + if (decode_exponents(gb, ctx->lfeexpstr, 2, ctx->dlfeexps[0], ctx->dlfeexps + 1)) { av_log(NULL, AV_LOG_ERROR, "error decoding lfe exponents\n"); return -1; } } if (get_bits1(gb)) { /* bit allocation information */ - *flags |= AC3_AB_BAIE; bit_alloc_flags |= 127; - ab->sdcycod = get_bits(gb, 2); - ab->fdcycod = get_bits(gb, 2); - ab->sgaincod = get_bits(gb, 2); - ab->dbpbcod = get_bits(gb, 2); - ab->floorcod = get_bits(gb, 3); + ctx->sdcycod = get_bits(gb, 2); + ctx->fdcycod = get_bits(gb, 2); + ctx->sgaincod = get_bits(gb, 2); + ctx->dbpbcod = get_bits(gb, 2); + ctx->floorcod = get_bits(gb, 3); } + if (get_bits1(gb)) { /* snroffset */ - *flags |= AC3_AB_SNROFFSTE; bit_alloc_flags |= 127; - ab->csnroffst = get_bits(gb, 6); - if (ab->chincpl) { /* couling fine snr offset and fast gain code */ - ab->cplfsnroffst = get_bits(gb, 4); - ab->cplfgaincod = get_bits(gb, 3); + ctx->csnroffst = get_bits(gb, 6); + if (ctx->cplinu) { /* couling fine snr offset and fast gain code */ + ctx->cplfsnroffst = get_bits(gb, 4); + ctx->cplfgaincod = get_bits(gb, 3); } for (i = 0; i < nfchans; i++) { /* channel fine snr offset and fast gain code */ - ab->fsnroffst[i] = get_bits(gb, 4); - ab->fgaincod[i] = get_bits(gb, 3); + ctx->fsnroffst[i] = get_bits(gb, 4); + ctx->fgaincod[i] = get_bits(gb, 3); } - if (ctx->bsi.flags & AC3_BSI_LFEON) { /* lfe fine snr offset and fast gain code */ - ab->lfefsnroffst = get_bits(gb, 4); - ab->lfefgaincod = get_bits(gb, 3); + if (ctx->lfeon) { /* lfe fine snr offset and fast gain code */ + ctx->lfefsnroffst = get_bits(gb, 4); + ctx->lfefgaincod = get_bits(gb, 3); } } - if (ab->chincpl) - if (get_bits1(gb)) { /* coupling leak information */ - bit_alloc_flags |= 64; - *flags |= AC3_AB_CPLLEAKE; - ab->cplfleak = get_bits(gb, 3); - ab->cplsleak = get_bits(gb, 3); - } - ab->cpldeltbae = AC3_DBASTR_RESERVED; - for (i = 0; i < nfchans; i++) - ab->deltbae[i] = AC3_DBASTR_RESERVED; + + ctx->cplfleak = 0; + ctx->cplsleak = 0; + if (ctx->cplinu && get_bits1(gb)) { /* coupling leak information */ + bit_alloc_flags |= 64; + ctx->cplfleak = get_bits(gb, 3); + ctx->cplsleak = get_bits(gb, 3); + } + if (get_bits1(gb)) { /* delta bit allocation information */ - *flags |= AC3_AB_DELTBAIE; bit_alloc_flags |= 127; - if (ab->chincpl) { - ab->cpldeltbae = get_bits(gb, 2); - if (ab->cpldeltbae == AC3_DBASTR_RESERVED) { + + if (ctx->cplinu) { + ctx->cpldeltbae = get_bits(gb, 2); + if (ctx->cpldeltbae == AC3_DBASTR_RESERVED) { av_log(NULL, AV_LOG_ERROR, "coupling delta bit allocation strategy reserved\n"); return -1; } } + for (i = 0; i < nfchans; i++) { - ab->deltbae[i] = get_bits(gb, 2); - if (ab->deltbae[i] == AC3_DBASTR_RESERVED) { + ctx->deltbae[i] = get_bits(gb, 2); + if (ctx->deltbae[i] == AC3_DBASTR_RESERVED) { av_log(NULL, AV_LOG_ERROR, "delta bit allocation strategy reserved\n"); return -1; } } - if (ab->chincpl) - if (ab->cpldeltbae == AC3_DBASTR_NEW) { /*coupling delta offset, len and bit allocation */ - ab->cpldeltnseg = get_bits(gb, 3); - for (seg = 0; seg <= ab->cpldeltnseg; seg++) { - ab->cpldeltoffst[seg] = get_bits(gb, 5); - ab->cpldeltlen[seg] = get_bits(gb, 4); - ab->cpldeltba[seg] = get_bits(gb, 3); + + if (ctx->cplinu) + if (ctx->cpldeltbae == AC3_DBASTR_NEW) { /*coupling delta offset, len and bit allocation */ + ctx->cpldeltnseg = get_bits(gb, 3); + for (seg = 0; seg <= ctx->cpldeltnseg; seg++) { + ctx->cpldeltoffst[seg] = get_bits(gb, 5); + ctx->cpldeltlen[seg] = get_bits(gb, 4); + ctx->cpldeltba[seg] = get_bits(gb, 3); } } + for (i = 0; i < nfchans; i++) - if (ab->deltbae[i] == AC3_DBASTR_NEW) {/*channel delta offset, len and bit allocation */ - ab->deltnseg[i] = get_bits(gb, 3); - for (seg = 0; seg <= ab->deltnseg[i]; seg++) { - ab->deltoffst[i][seg] = get_bits(gb, 5); - ab->deltlen[i][seg] = get_bits(gb, 4); - ab->deltba[i][seg] = get_bits(gb, 3); + if (ctx->deltbae[i] == AC3_DBASTR_NEW) {/*channel delta offset, len and bit allocation */ + ctx->deltnseg[i] = get_bits(gb, 3); + for (seg = 0; seg <= ctx->deltnseg[i]; seg++) { + ctx->deltoffst[i][seg] = get_bits(gb, 5); + ctx->deltlen[i][seg] = get_bits(gb, 4); + ctx->deltba[i][seg] = get_bits(gb, 3); } } } do_bit_allocation (ctx, bit_alloc_flags); /* perform the bit allocation */ + if (get_bits1(gb)) { /* unused dummy data */ - *flags |= AC3_AB_SKIPLE; - ab->skipl = get_bits(gb, 9); - while(ab->skipl--) + skipl = get_bits(gb, 9); + while(skipl--) skip_bits(gb, 8); } /* unpack the transform coefficients @@ -1782,15 +1915,15 @@ static int ac3_parse_audio_block(AC3DecodeContext * ctx, int index) return -1; } /*for (i = 0; i < nfchans; i++) - dump_floats("channel transform coefficients", 10, ab->transform_coeffs[i + 1], BLOCK_SIZE);*/ + dump_floats("channel transform coefficients", 10, ctx->transform_coeffs[i + 1], BLOCK_SIZE);*/ /* recover coefficients if rematrixing is in use */ - if (*flags & AC3_AB_REMATSTR) + if (ctx->rematflg) do_rematrixing(ctx); do_imdct(ctx); /*for(i = 0; i < nfchans; i++) - dump_floats("channel output", 10, ab->output[i + 1], BLOCK_SIZE);*/ + dump_floats("channel output", 10, ctx->output[i + 1], BLOCK_SIZE);*/ do_downmix(ctx); @@ -1809,7 +1942,6 @@ static int frame_count = 0; static int ac3_decode_frame(AVCodecContext * avctx, void *data, int *data_size, uint8_t *buf, int buf_size) { AC3DecodeContext *ctx = (AC3DecodeContext *)avctx->priv_data; - ac3_audio_block *ab = &ctx->audio_block; int frame_start; int16_t *out_samples = (int16_t *)data; int i, j, k, value; @@ -1845,49 +1977,50 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, int *data_size, //If 'bsid' is not valid decoder shall not decode the audio as per the standard. ac3_parse_bsi(ctx); - avctx->sample_rate = ctx->sync_info.sampling_rate; - avctx->bit_rate = ctx->sync_info.bit_rate; + avctx->sample_rate = ctx->sampling_rate; + avctx->bit_rate = ctx->bit_rate; + avctx->channels = 0; if (avctx->channels == 0) { - ctx->output |= AC3_OUTPUT_UNMODIFIED; - avctx->channels = ctx->bsi.nfchans; - } else if ((ctx->bsi.nfchans + ((ctx->bsi.flags & AC3_BSI_LFEON) ? 1 : 0)) < avctx->channels) { + ctx->blkoutput |= AC3_OUTPUT_UNMODIFIED; + avctx->channels = ctx->nfchans; + } else if (ctx->nfchans + ctx->lfeon < avctx->channels) { av_log(avctx, AV_LOG_INFO, "ac3_decoder: AC3 Source Channels Are Less Then Specified %d: Output to %d Channels\n", - avctx->channels, (ctx->bsi.nfchans + ((ctx->bsi.flags & AC3_BSI_LFEON) ? 1 : 0))); - avctx->channels = ctx->bsi.nfchans; - ctx->output |= AC3_OUTPUT_UNMODIFIED; + avctx->channels, ctx->nfchans + ctx->lfeon); + avctx->channels = ctx->nfchans; + ctx->blkoutput |= AC3_OUTPUT_UNMODIFIED; } else if (avctx->channels == 1) { - ctx->output |= AC3_OUTPUT_MONO; + ctx->blkoutput |= AC3_OUTPUT_MONO; } else if (avctx->channels == 2) { - if (ctx->bsi.dsurmod == 0x02) - ctx->output |= AC3_OUTPUT_DOLBY; + if (ctx->dsurmod == 0x02) + ctx->blkoutput |= AC3_OUTPUT_DOLBY; else - ctx->output |= AC3_OUTPUT_STEREO; + ctx->blkoutput |= AC3_OUTPUT_STEREO; } - if (ctx->bsi.flags & AC3_BSI_LFEON) { + if (ctx->lfeon) { avctx->channels++; - ctx->output |= AC3_OUTPUT_LFEON; + ctx->blkoutput |= AC3_OUTPUT_LFEON; } av_log(avctx, AV_LOG_INFO, "channels = %d \t bit rate = %d \t sampling rate = %d \n", avctx->channels, avctx->bit_rate * 1000, avctx->sample_rate); //Parse the Audio Blocks. for (i = 0; i < AUDIO_BLOCKS; i++) { - if (ac3_parse_audio_block(ctx, i)) { + if (ac3_parse_audio_block(ctx)) { av_log(avctx, AV_LOG_ERROR, "error parsing the audio block\n"); *data_size = 0; - return ctx->sync_info.framesize; + return ctx->frame_size; } - j = ((ctx->output & AC3_OUTPUT_LFEON) ? 0 : 1); + j = ((ctx->blkoutput & AC3_OUTPUT_LFEON) ? 0 : 1); for (k = 0; k < BLOCK_SIZE; k++) { - j = ((ctx->output & AC3_OUTPUT_LFEON) ? 0 : 1); + j = ((ctx->blkoutput & AC3_OUTPUT_LFEON) ? 0 : 1); for (;j < avctx->channels + 1; j++) { - value = convert(ab->output[j][k]); + value = convert(ctx->output[j][k]); *(out_samples++) = value; } } } *data_size = AUDIO_BLOCKS * BLOCK_SIZE * avctx->channels * sizeof (int16_t); - return ctx->sync_info.framesize; + return ctx->frame_size; } static int ac3_decode_end(AVCodecContext *ctx) |