/* * PCM codecs * Copyright (c) 2001 Fabrice Bellard. * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file pcm.c * PCM codecs */ #include "avcodec.h" #include "bitstream.h" // for ff_reverse #include "bytestream.h" #define MAX_CHANNELS 64 /* from g711.c by SUN microsystems (unrestricted use) */ #define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */ #define QUANT_MASK (0xf) /* Quantization field mask. */ #define NSEGS (8) /* Number of A-law segments. */ #define SEG_SHIFT (4) /* Left shift for segment number. */ #define SEG_MASK (0x70) /* Segment field mask. */ #define BIAS (0x84) /* Bias for linear code. */ /* * alaw2linear() - Convert an A-law value to 16-bit linear PCM * */ static av_cold int alaw2linear(unsigned char a_val) { int t; int seg; a_val ^= 0x55; t = a_val & QUANT_MASK; seg = ((unsigned)a_val & SEG_MASK) >> SEG_SHIFT; if(seg) t= (t + t + 1 + 32) << (seg + 2); else t= (t + t + 1 ) << 3; return (a_val & SIGN_BIT) ? t : -t; } static av_cold int ulaw2linear(unsigned char u_val) { int t; /* Complement to obtain normal u-law value. */ u_val = ~u_val; /* * Extract and bias the quantization bits. Then * shift up by the segment number and subtract out the bias. */ t = ((u_val & QUANT_MASK) << 3) + BIAS; t <<= ((unsigned)u_val & SEG_MASK) >> SEG_SHIFT; return (u_val & SIGN_BIT) ? (BIAS - t) : (t - BIAS); } /* 16384 entries per table */ static uint8_t linear_to_alaw[16384]; static uint8_t linear_to_ulaw[16384]; static av_cold void build_xlaw_table(uint8_t *linear_to_xlaw, int (*xlaw2linear)(unsigned char), int mask) { int i, j, v, v1, v2; j = 0; for(i=0;i<128;i++) { if (i != 127) { v1 = xlaw2linear(i ^ mask); v2 = xlaw2linear((i + 1) ^ mask); v = (v1 + v2 + 4) >> 3; } else { v = 8192; } for(;j<v;j++) { linear_to_xlaw[8192 + j] = (i ^ mask); if (j > 0) linear_to_xlaw[8192 - j] = (i ^ (mask ^ 0x80)); } } linear_to_xlaw[0] = linear_to_xlaw[1]; } static av_cold int pcm_encode_init(AVCodecContext *avctx) { avctx->frame_size = 1; switch(avctx->codec->id) { case CODEC_ID_PCM_ALAW: build_xlaw_table(linear_to_alaw, alaw2linear, 0xd5); break; case CODEC_ID_PCM_MULAW: build_xlaw_table(linear_to_ulaw, ulaw2linear, 0xff); break; default: break; } switch(avctx->codec->id) { case CODEC_ID_PCM_S32LE: case CODEC_ID_PCM_S32BE: case CODEC_ID_PCM_U32LE: case CODEC_ID_PCM_U32BE: avctx->block_align = 4 * avctx->channels; break; case CODEC_ID_PCM_S24LE: case CODEC_ID_PCM_S24BE: case CODEC_ID_PCM_U24LE: case CODEC_ID_PCM_U24BE: case CODEC_ID_PCM_S24DAUD: avctx->block_align = 3 * avctx->channels; break; case CODEC_ID_PCM_S16LE: case CODEC_ID_PCM_S16BE: case CODEC_ID_PCM_U16LE: case CODEC_ID_PCM_U16BE: avctx->block_align = 2 * avctx->channels; break; case CODEC_ID_PCM_S8: case CODEC_ID_PCM_U8: case CODEC_ID_PCM_MULAW: case CODEC_ID_PCM_ALAW: avctx->block_align = avctx->channels; break; default: break; } avctx->coded_frame= avcodec_alloc_frame(); avctx->coded_frame->key_frame= 1; return 0; } static av_cold int pcm_encode_close(AVCodecContext *avctx) { av_freep(&avctx->coded_frame); return 0; } /** * \brief convert samples from 16 bit * \param bps byte per sample for the destination format, must be >= 2 * \param le 0 for big-, 1 for little-endian * \param us 0 for signed, 1 for unsigned output * \param samples input samples * \param dst output samples * \param n number of samples in samples buffer. */ static inline void encode_from16(int bps, int le, int us, short **samples, uint8_t **dst, int n) { int usum = us ? 0x8000 : 0; if (bps > 2) memset(*dst, 0, n * bps); if (le) *dst += bps - 2; for(;n>0;n--) { register int v = *(*samples)++; v += usum; if (le) AV_WL16(*dst, v); else AV_WB16(*dst, v); *dst += bps; } if (le) *dst -= bps - 2; } static int pcm_encode_frame(AVCodecContext *avctx, unsigned char *frame, int buf_size, void *data) { int n, sample_size, v; short *samples; unsigned char *dst; switch(avctx->codec->id) { case CODEC_ID_PCM_S32LE: case CODEC_ID_PCM_S32BE: case CODEC_ID_PCM_U32LE: case CODEC_ID_PCM_U32BE: sample_size = 4; break; case CODEC_ID_PCM_S24LE: case CODEC_ID_PCM_S24BE: case CODEC_ID_PCM_U24LE: case CODEC_ID_PCM_U24BE: case CODEC_ID_PCM_S24DAUD: sample_size = 3; break; case CODEC_ID_PCM_S16LE: case CODEC_ID_PCM_S16BE: case CODEC_ID_PCM_U16LE: case CODEC_ID_PCM_U16BE: sample_size = 2; break; default: sample_size = 1; break; } n = buf_size / sample_size; samples = data; dst = frame; switch(avctx->codec->id) { case CODEC_ID_PCM_S32LE: encode_from16(4, 1, 0, &samples, &dst, n); break; case CODEC_ID_PCM_S32BE: encode_from16(4, 0, 0, &samples, &dst, n); break; case CODEC_ID_PCM_U32LE: encode_from16(4, 1, 1, &samples, &dst, n); break; case CODEC_ID_PCM_U32BE: encode_from16(4, 0, 1, &samples, &dst, n); break; case CODEC_ID_PCM_S24LE: encode_from16(3, 1, 0, &samples, &dst, n); break; case CODEC_ID_PCM_S24BE: encode_from16(3, 0, 0, &samples, &dst, n); break; case CODEC_ID_PCM_U24LE: encode_from16(3, 1, 1, &samples, &dst, n); break; case CODEC_ID_PCM_U24BE: encode_from16(3, 0, 1, &samples, &dst, n); break; case CODEC_ID_PCM_S24DAUD: for(;n>0;n--) { uint32_t tmp = ff_reverse[*samples >> 8] + (ff_reverse[*samples & 0xff] << 8); tmp <<= 4; // sync flags would go here bytestream_put_be24(&dst, tmp); samples++; } break; case CODEC_ID_PCM_S16LE: for(;n>0;n--) { v = *samples++; bytestream_put_le16(&dst, v); } break; case CODEC_ID_PCM_S16BE: for(;n>0;n--) { v = *samples++; bytestream_put_be16(&dst, v); } break; case CODEC_ID_PCM_U16LE: for(;n>0;n--) { v = *samples++; v += 0x8000; bytestream_put_le16(&dst, v); } break; case CODEC_ID_PCM_U16BE: for(;n>0;n--) { v = *samples++; v += 0x8000; bytestream_put_be16(&dst, v); } break; case CODEC_ID_PCM_S8: for(;n>0;n--) { v = *samples++; *dst++ = v >> 8; } break; case CODEC_ID_PCM_U8: for(;n>0;n--) { v = *samples++; *dst++ = (v >> 8) + 128; } break; case CODEC_ID_PCM_ZORK: for(;n>0;n--) { v= *samples++ >> 8; if(v<0) v = -v; else v+= 128; *dst++ = v; } break; case CODEC_ID_PCM_ALAW: for(;n>0;n--) { v = *samples++; *dst++ = linear_to_alaw[(v + 32768) >> 2]; } break; case CODEC_ID_PCM_MULAW: for(;n>0;n--) { v = *samples++; *dst++ = linear_to_ulaw[(v + 32768) >> 2]; } break; default: return -1; } //avctx->frame_size = (dst - frame) / (sample_size * avctx->channels); return dst - frame; } typedef struct PCMDecode { short table[256]; } PCMDecode; static av_cold int pcm_decode_init(AVCodecContext * avctx) { PCMDecode *s = avctx->priv_data; int i; switch(avctx->codec->id) { case CODEC_ID_PCM_ALAW: for(i=0;i<256;i++) s->table[i] = alaw2linear(i); break; case CODEC_ID_PCM_MULAW: for(i=0;i<256;i++) s->table[i] = ulaw2linear(i); break; default: break; } return 0; } /** * \brief convert samples to 16 bit * \param bps byte per sample for the source format, must be >= 2 * \param le 0 for big-, 1 for little-endian * \param us 0 for signed, 1 for unsigned input * \param src input samples * \param samples output samples * \param src_len number of bytes in src */ static inline void decode_to16(int bps, int le, int us, const uint8_t **src, short **samples, int src_len) { int usum = us ? -0x8000 : 0; register int n = src_len / bps; if (le) *src += bps - 2; for(;n>0;n--) { register int v; if (le) v = AV_RL16(*src); else v = AV_RB16(*src); v += usum; *(*samples)++ = v; *src += bps; } if (le) *src -= bps - 2; } static int pcm_decode_frame(AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size) { PCMDecode *s = avctx->priv_data; int c, n; short *samples; const uint8_t *src, *src2[MAX_CHANNELS]; samples = data; src = buf; if(avctx->channels <= 0 || avctx->channels > MAX_CHANNELS){ av_log(avctx, AV_LOG_ERROR, "PCM channels out of bounds\n"); return -1; } n = avctx->channels * av_get_bits_per_sample(avctx->codec_id)/8; /* av_get_bits_per_sample returns 0 for CODEC_ID_PCM_DVD */ if (CODEC_ID_PCM_DVD == avctx->codec_id) /* 2 samples are interleaved per block in PCM_DVD */ n = 2 * avctx->channels * avctx->bits_per_sample/8; if(n && buf_size % n){ av_log(avctx, AV_LOG_ERROR, "invalid PCM packet\n"); return -1; } buf_size= FFMIN(buf_size, *data_size/2); *data_size=0; n = buf_size/avctx->channels; for(c=0;c<avctx->channels;c++) src2[c] = &src[c*n]; switch(avctx->codec->id) { case CODEC_ID_PCM_S32LE: decode_to16(4, 1, 0, &src, &samples, buf_size); break; case CODEC_ID_PCM_S32BE: decode_to16(4, 0, 0, &src, &samples, buf_size); break; case CODEC_ID_PCM_U32LE: decode_to16(4, 1, 1, &src, &samples, buf_size); break; case CODEC_ID_PCM_U32BE: decode_to16(4, 0, 1, &src, &samples, buf_size); break; case CODEC_ID_PCM_S24LE: decode_to16(3, 1, 0, &src, &samples, buf_size); break; case CODEC_ID_PCM_S24BE: decode_to16(3, 0, 0, &src, &samples, buf_size); break; case CODEC_ID_PCM_U24LE: decode_to16(3, 1, 1, &src, &samples, buf_size); break; case CODEC_ID_PCM_U24BE: decode_to16(3, 0, 1, &src, &samples, buf_size); break; case CODEC_ID_PCM_S24DAUD: n = buf_size / 3; for(;n>0;n--) { uint32_t v = bytestream_get_be24(&src); v >>= 4; // sync flags are here *samples++ = ff_reverse[(v >> 8) & 0xff] + (ff_reverse[v & 0xff] << 8); } break; case CODEC_ID_PCM_S16LE: n = buf_size >> 1; for(;n>0;n--) { *samples++ = bytestream_get_le16(&src); } break; case CODEC_ID_PCM_S16LE_PLANAR: for(n>>=1;n>0;n--) for(c=0;c<avctx->channels;c++) *samples++ = bytestream_get_le16(&src2[c]); src = src2[avctx->channels-1]; break; case CODEC_ID_PCM_S16BE: n = buf_size >> 1; for(;n>0;n--) { *samples++ = bytestream_get_be16(&src); } break; case CODEC_ID_PCM_U16LE: n = buf_size >> 1; for(;n>0;n--) { *samples++ = bytestream_get_le16(&src) - 0x8000; } break; case CODEC_ID_PCM_U16BE: n = buf_size >> 1; for(;n>0;n--) { *samples++ = bytestream_get_be16(&src) - 0x8000; } break; case CODEC_ID_PCM_S8: n = buf_size; for(;n>0;n--) { *samples++ = *src++ << 8; } break; case CODEC_ID_PCM_U8: n = buf_size; for(;n>0;n--) { *samples++ = ((int)*src++ - 128) << 8; } break; case CODEC_ID_PCM_ZORK: n = buf_size; for(;n>0;n--) { int x= *src++; if(x&128) x-= 128; else x = -x; *samples++ = x << 8; } break; case CODEC_ID_PCM_ALAW: case CODEC_ID_PCM_MULAW: n = buf_size; for(;n>0;n--) { *samples++ = s->table[*src++]; } break; case CODEC_ID_PCM_DVD: if(avctx->bits_per_sample != 20 && avctx->bits_per_sample != 24) { av_log(avctx, AV_LOG_ERROR, "PCM DVD unsupported sample depth\n"); return -1; } else { int jump = avctx->channels * (avctx->bits_per_sample-16) / 4; n = buf_size / (avctx->channels * 2 * avctx->bits_per_sample / 8); while (n--) { for (c=0; c < 2*avctx->channels; c++) *samples++ = bytestream_get_be16(&src); src += jump; } } break; default: return -1; } *data_size = (uint8_t *)samples - (uint8_t *)data; return src - buf; } #ifdef CONFIG_ENCODERS #define PCM_ENCODER(id,name,long_name_) \ AVCodec name ## _encoder = { \ #name, \ CODEC_TYPE_AUDIO, \ id, \ 0, \ pcm_encode_init, \ pcm_encode_frame, \ pcm_encode_close, \ NULL, \ .long_name = long_name_, \ }; #else #define PCM_ENCODER(id,name,long_name_) #endif #ifdef CONFIG_DECODERS #define PCM_DECODER(id,name,long_name_) \ AVCodec name ## _decoder = { \ #name, \ CODEC_TYPE_AUDIO, \ id, \ sizeof(PCMDecode), \ pcm_decode_init, \ NULL, \ NULL, \ pcm_decode_frame, \ .long_name = long_name_, \ }; #else #define PCM_DECODER(id,name,long_name_) #endif #define PCM_CODEC(id, name, long_name_) \ PCM_ENCODER(id,name,long_name_) PCM_DECODER(id,name,long_name_) PCM_CODEC (CODEC_ID_PCM_ALAW, pcm_alaw, "A-law PCM"); PCM_CODEC (CODEC_ID_PCM_DVD, pcm_dvd, "signed 16|20|24-bit big-endian PCM"); PCM_CODEC (CODEC_ID_PCM_MULAW, pcm_mulaw, "mu-law PCM"); PCM_CODEC (CODEC_ID_PCM_S8, pcm_s8, "signed 8-bit PCM"); PCM_CODEC (CODEC_ID_PCM_S16BE, pcm_s16be, "signed 16-bit big-endian PCM"); PCM_CODEC (CODEC_ID_PCM_S16LE, pcm_s16le, "signed 16-bit little-endian PCM"); PCM_DECODER(CODEC_ID_PCM_S16LE_PLANAR, pcm_s16le_planar, "16-bit little-endian planar PCM"); PCM_CODEC (CODEC_ID_PCM_S24BE, pcm_s24be, "signed 24-bit big-endian PCM"); PCM_CODEC (CODEC_ID_PCM_S24DAUD, pcm_s24daud, "D-Cinema audio signed 24-bit PCM"); PCM_CODEC (CODEC_ID_PCM_S24LE, pcm_s24le, "signed 24-bit little-endian PCM"); PCM_CODEC (CODEC_ID_PCM_S32BE, pcm_s32be, "signed 32-bit big-endian PCM"); PCM_CODEC (CODEC_ID_PCM_S32LE, pcm_s32le, "signed 32-bit little-endian PCM"); PCM_CODEC (CODEC_ID_PCM_U8, pcm_u8, "unsigned 8-bit PCM"); PCM_CODEC (CODEC_ID_PCM_U16BE, pcm_u16be, "unsigned 16-bit big-endian PCM"); PCM_CODEC (CODEC_ID_PCM_U16LE, pcm_u16le, "unsigned 16-bit little-endian PCM"); PCM_CODEC (CODEC_ID_PCM_U24BE, pcm_u24be, "unsigned 24-bit big-endian PCM"); PCM_CODEC (CODEC_ID_PCM_U24LE, pcm_u24le, "unsigned 24-bit little-endian PCM"); PCM_CODEC (CODEC_ID_PCM_U32BE, pcm_u32be, "unsigned 32-bit big-endian PCM"); PCM_CODEC (CODEC_ID_PCM_U32LE, pcm_u32le, "unsigned 32-bit little-endian PCM"); PCM_CODEC (CODEC_ID_PCM_ZORK, pcm_zork, "Zork PCM");