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author | Michael Niedermayer <michaelni@gmx.at> | 2003-11-29 08:37:51 +0000 |
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committer | Michael Niedermayer <michaelni@gmx.at> | 2003-11-29 08:37:51 +0000 |
commit | dba019dabab2314d00e30b8d53a5ae46de711953 (patch) | |
tree | 2db9e7aecbaaace4bdb20191662ad559c87a5f5f /libavcodec | |
parent | cc15c9312782e260fdebb895a8f5ecef4ac7f806 (diff) | |
download | ffmpeg-dba019dabab2314d00e30b8d53a5ae46de711953.tar.gz |
h263 alternative inter vlc support
Originally committed as revision 2541 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec')
-rw-r--r-- | libavcodec/avcodec.h | 4 | ||||
-rw-r--r-- | libavcodec/h263.c | 69 | ||||
-rw-r--r-- | libavcodec/mpegvideo.c | 1 | ||||
-rw-r--r-- | libavcodec/mpegvideo.h | 3 |
4 files changed, 64 insertions, 13 deletions
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h index d5eacab310..58a522747e 100644 --- a/libavcodec/avcodec.h +++ b/libavcodec/avcodec.h @@ -229,7 +229,7 @@ static const __attribute__((unused)) int Motion_Est_QTab[] = */ #define CODEC_FLAG_QSCALE 0x0002 ///< use fixed qscale -#define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed +#define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / Advanced prediction for H263 #define CODEC_FLAG_QPEL 0x0010 ///< use qpel MC #define CODEC_FLAG_GMC 0x0020 ///< use GMC #define CODEC_FLAG_MV0 0x0040 ///< always try a MB with MV=<0,0> @@ -258,6 +258,7 @@ static const __attribute__((unused)) int Motion_Est_QTab[] = #define CODEC_FLAG_H263P_UMV 0x02000000 ///< Unlimited motion vector #define CODEC_FLAG_CBP_RD 0x04000000 ///< use rate distortion optimization for cbp #define CODEC_FLAG_QP_RD 0x08000000 ///< use rate distortion optimization for qp selectioon +#define CODEC_FLAG_H263P_AIV 0x00000008 ///< H263 Alternative inter vlc /* For advanced prediction mode, we reuse the 4MV flag */ /* Unsupported options : * Syntax Arithmetic coding (SAC) @@ -265,7 +266,6 @@ static const __attribute__((unused)) int Motion_Est_QTab[] = * Slice structured * Reference Picture Selection * Independant Segment Decoding - * Alternative Inter * VLC * Modified Quantization */ /* /Fx */ /* codec capabilities */ diff --git a/libavcodec/h263.c b/libavcodec/h263.c index a3cf187654..80bacc23a0 100644 --- a/libavcodec/h263.c +++ b/libavcodec/h263.c @@ -246,7 +246,7 @@ void h263_encode_picture_header(MpegEncContext * s, int picture_number) put_bits(&s->pb,1,0); /* Slice Structured: off */ put_bits(&s->pb,1,0); /* Reference Picture Selection: off */ put_bits(&s->pb,1,0); /* Independent Segment Decoding: off */ - put_bits(&s->pb,1,0); /* Alternative Inter VLC: off */ + put_bits(&s->pb,1,s->alt_inter_vlc); /* Alternative Inter VLC */ put_bits(&s->pb,1,0); /* Modified Quantization: off */ put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */ put_bits(&s->pb,3,0); /* Reserved */ @@ -1071,9 +1071,10 @@ void h263_encode_mb(MpegEncContext * s, put_bits(&s->pb, 1, 0); /* mb coded */ cbpc = cbp & 3; - if(s->dquant) cbpc+= 8; cbpy = cbp >> 2; - cbpy ^= 0xf; + if(s->alt_inter_vlc==0 || cbpc!=3) + cbpy ^= 0xF; + if(s->dquant) cbpc+= 8; if(s->mv_type==MV_TYPE_16X16){ put_bits(&s->pb, inter_MCBPC_bits[cbpc], @@ -1804,6 +1805,42 @@ static void h263_encode_block(MpegEncContext * s, DCTELEM * block, int n) i = 0; if (s->h263_aic && s->mb_intra) rl = &rl_intra_aic; + + if(s->alt_inter_vlc && !s->mb_intra){ + int aic_vlc_bits=0; + int inter_vlc_bits=0; + int wrong_pos=-1; + int aic_code; + + last_index = s->block_last_index[n]; + last_non_zero = i - 1; + for (; i <= last_index; i++) { + j = s->intra_scantable.permutated[i]; + level = block[j]; + if (level) { + run = i - last_non_zero - 1; + last = (i == last_index); + + code = get_rl_index(rl, last, run, level); + aic_code = get_rl_index(&rl_intra_aic, last, run, level); + inter_vlc_bits += rl->table_vlc[code][1]+1; + aic_vlc_bits += rl_intra_aic.table_vlc[aic_code][1]+1; + + if (code == rl->n) { + inter_vlc_bits += 1+6+8; + } + if (aic_code == rl_intra_aic.n) { + aic_vlc_bits += 1+6+8; + wrong_pos += run + 1; + }else + wrong_pos += wrong_run[aic_code]; + last_non_zero = i; + } + } + i = 0; + if(aic_vlc_bits < inter_vlc_bits && wrong_pos > 63) + rl = &rl_intra_aic; + } } /* AC coefs */ @@ -3474,7 +3511,11 @@ int ff_h263_decode_mb(MpegEncContext *s, s->mcsel= get_bits1(&s->gb); else s->mcsel= 0; cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1); - cbp = (cbpc & 3) | ((cbpy ^ 0xf) << 2); + + if(s->alt_inter_vlc==0 || (cbpc & 3)!=3) + cbpy ^= 0xF; + + cbp = (cbpc & 3) | (cbpy << 2); if (dquant) { change_qscale(s, quant_tab[get_bits(&s->gb, 2)]); } @@ -3865,6 +3906,7 @@ static int h263_decode_block(MpegEncContext * s, DCTELEM * block, int code, level, i, j, last, run; RLTable *rl = &rl_inter; const uint8_t *scan_table; + GetBitContext gb= s->gb; scan_table = s->intra_scantable.permutated; if (s->h263_aic && s->mb_intra) { @@ -3916,7 +3958,7 @@ static int h263_decode_block(MpegEncContext * s, DCTELEM * block, s->block_last_index[n] = i - 1; return 0; } - +retry: for(;;) { code = get_vlc2(&s->gb, rl->vlc.table, TEX_VLC_BITS, 2); if (code < 0){ @@ -3957,6 +3999,14 @@ static int h263_decode_block(MpegEncContext * s, DCTELEM * block, } i += run; if (i >= 64){ + if(s->alt_inter_vlc && rl == &rl_inter && !s->mb_intra){ + //looks like a hack but no, its the way its supposed to work ... + rl = &rl_intra_aic; + i = 0; + s->gb= gb; + memset(block, 0, sizeof(DCTELEM)*64); + goto retry; + } av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d\n", s->mb_x, s->mb_y); return -1; } @@ -4408,9 +4458,7 @@ int h263_decode_picture_header(MpegEncContext *s) if (get_bits1(&s->gb) != 0) { av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n"); } - if (get_bits1(&s->gb) != 0) { - av_log(s->avctx, AV_LOG_ERROR, "Alternative Inter VLC not supported\n"); - } + s->alt_inter_vlc= get_bits1(&s->gb); if (get_bits1(&s->gb) != 0) { av_log(s->avctx, AV_LOG_ERROR, "Modified Quantization not supported\n"); } @@ -4491,14 +4539,15 @@ int h263_decode_picture_header(MpegEncContext *s) } if(s->avctx->debug&FF_DEBUG_PICT_INFO){ - av_log(s->avctx, AV_LOG_DEBUG, "qp:%d %c size:%d rnd:%d%s%s%s%s%s\n", + av_log(s->avctx, AV_LOG_DEBUG, "qp:%d %c size:%d rnd:%d%s%s%s%s%s%s\n", s->qscale, av_get_pict_type_char(s->pict_type), s->gb.size_in_bits, 1-s->no_rounding, s->obmc ? " AP" : "", s->umvplus ? " UMV" : "", s->h263_long_vectors ? " LONG" : "", s->h263_plus ? " +" : "", - s->h263_aic ? " AIC" : "" + s->h263_aic ? " AIC" : "", + s->alt_inter_vlc ? " AIV" : "" ); } #if 1 diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c index 1186d34e96..1fe94e729e 100644 --- a/libavcodec/mpegvideo.c +++ b/libavcodec/mpegvideo.c @@ -779,6 +779,7 @@ int MPV_encode_init(AVCodecContext *avctx) /* Fx */ s->unrestricted_mv=(avctx->flags & CODEC_FLAG_H263P_UMV) ? 1:0; s->h263_aic= (avctx->flags & CODEC_FLAG_H263P_AIC) ? 1:0; + s->alt_inter_vlc= (avctx->flags & CODEC_FLAG_H263P_AIV) ? 1:0; /* /Fx */ /* These are just to be sure */ s->umvplus = 1; diff --git a/libavcodec/mpegvideo.h b/libavcodec/mpegvideo.h index 1381023807..62b004fa3b 100644 --- a/libavcodec/mpegvideo.h +++ b/libavcodec/mpegvideo.h @@ -519,12 +519,13 @@ typedef struct MpegEncContext { /* H.263 specific */ int gob_number; int gob_index; + int obmc; ///< overlapped block motion compensation /* H.263+ specific */ int umvplus; ///< == H263+ && unrestricted_mv int h263_aic; ///< Advanded INTRA Coding (AIC) int h263_aic_dir; ///< AIC direction: 0 = left, 1 = top - int obmc; ///< overlapped block motion compensation + int alt_inter_vlc; ///< alternative inter vlc /* mpeg4 specific */ int time_increment_resolution; |