static int adpcm_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; ADPCMDecodeContext *c = avctx->priv_data; ADPCMChannelStatus *cs; int n, m, channel, i; short *samples; const uint8_t *src; int st; /* stereo */ int count1, count2; int nb_samples, coded_samples, ret; nb_samples = get_nb_samples(avctx, buf, buf_size, &coded_samples); if (nb_samples <= 0) { av_log(avctx, AV_LOG_ERROR, "invalid number of samples in packet\n"); return AVERROR_INVALIDDATA; } /* get output buffer */ c->frame.nb_samples = nb_samples; if ((ret = avctx->get_buffer(avctx, &c->frame)) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return ret; } samples = (short *)c->frame.data[0]; /* use coded_samples when applicable */ /* it is always <= nb_samples, so the output buffer will be large enough */ if (coded_samples) { if (coded_samples != nb_samples) av_log(avctx, AV_LOG_WARNING, "mismatch in coded sample count\n"); c->frame.nb_samples = nb_samples = coded_samples; } src = buf; st = avctx->channels == 2 ? 1 : 0; switch(avctx->codec->id) { case CODEC_ID_ADPCM_IMA_QT: /* In QuickTime, IMA is encoded by chunks of 34 bytes (=64 samples). Channel data is interleaved per-chunk. */ for (channel = 0; channel < avctx->channels; channel++) { int16_t predictor; int step_index; cs = &(c->status[channel]); /* (pppppp) (piiiiiii) */ /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */ predictor = AV_RB16(src); step_index = predictor & 0x7F; predictor &= 0xFF80; src += 2; if (cs->step_index == step_index) { int diff = (int)predictor - cs->predictor; if (diff < 0) diff = - diff; if (diff > 0x7f) goto update; } else { update: cs->step_index = step_index; cs->predictor = predictor; } if (cs->step_index > 88){ av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index); cs->step_index = 88; } samples = (short *)c->frame.data[0] + channel; for (m = 0; m < 32; m++) { *samples = adpcm_ima_qt_expand_nibble(cs, src[0] & 0x0F, 3); samples += avctx->channels; *samples = adpcm_ima_qt_expand_nibble(cs, src[0] >> 4 , 3); samples += avctx->channels; src ++; } } break; case CODEC_ID_ADPCM_IMA_WAV: if (avctx->block_align != 0 && buf_size > avctx->block_align) buf_size = avctx->block_align; for(i=0; i<avctx->channels; i++){ cs = &(c->status[i]); cs->predictor = *samples++ = (int16_t)bytestream_get_le16(&src); cs->step_index = *src++; if (cs->step_index > 88){ av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index); cs->step_index = 88; } if (*src++) av_log(avctx, AV_LOG_ERROR, "unused byte should be null but is %d!!\n", src[-1]); /* unused */ } for (n = (nb_samples - 1) / 8; n > 0; n--) { for (i = 0; i < avctx->channels; i++) { cs = &c->status[i]; for (m = 0; m < 4; m++) { uint8_t v = *src++; *samples = adpcm_ima_expand_nibble(cs, v & 0x0F, 3); samples += avctx->channels; *samples = adpcm_ima_expand_nibble(cs, v >> 4 , 3); samples += avctx->channels; } samples -= 8 * avctx->channels - 1; } samples += 7 * avctx->channels; } break; case CODEC_ID_ADPCM_4XM: for (i = 0; i < avctx->channels; i++) c->status[i].predictor= (int16_t)bytestream_get_le16(&src); for (i = 0; i < avctx->channels; i++) { c->status[i].step_index= (int16_t)bytestream_get_le16(&src); c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88); } for (i = 0; i < avctx->channels; i++) { samples = (short *)c->frame.data[0] + i; cs = &c->status[i]; for (n = nb_samples >> 1; n > 0; n--, src++) { uint8_t v = *src; *samples = adpcm_ima_expand_nibble(cs, v & 0x0F, 4); samples += avctx->channels; *samples = adpcm_ima_expand_nibble(cs, v >> 4 , 4); samples += avctx->channels; } } break; case CODEC_ID_ADPCM_MS: { int block_predictor; if (avctx->block_align != 0 && buf_size > avctx->block_align) buf_size = avctx->block_align; block_predictor = av_clip(*src++, 0, 6); c->status[0].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor]; c->status[0].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor]; if (st) { block_predictor = av_clip(*src++, 0, 6); c->status[1].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor]; c->status[1].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor]; } c->status[0].idelta = (int16_t)bytestream_get_le16(&src); if (st){ c->status[1].idelta = (int16_t)bytestream_get_le16(&src); } c->status[0].sample1 = bytestream_get_le16(&src); if (st) c->status[1].sample1 = bytestream_get_le16(&src); c->status[0].sample2 = bytestream_get_le16(&src); if (st) c->status[1].sample2 = bytestream_get_le16(&src); *samples++ = c->status[0].sample2; if (st) *samples++ = c->status[1].sample2; *samples++ = c->status[0].sample1; if (st) *samples++ = c->status[1].sample1; for(n = (nb_samples - 2) >> (1 - st); n > 0; n--, src++) { *samples++ = adpcm_ms_expand_nibble(&c->status[0 ], src[0] >> 4 ); *samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F); } break; } case CODEC_ID_ADPCM_IMA_DK4: if (avctx->block_align != 0 && buf_size > avctx->block_align) buf_size = avctx->block_align; for (channel = 0; channel < avctx->channels; channel++) { cs = &c->status[channel]; cs->predictor = (int16_t)bytestream_get_le16(&src); cs->step_index = av_clip(*src++, 0, 88); src++; *samples++ = cs->predictor; } for (n = nb_samples >> (1 - st); n > 0; n--, src++) { uint8_t v = *src; *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v >> 4 , 3); *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3); } break; case CODEC_ID_ADPCM_IMA_DK3: { unsigned char last_byte = 0; unsigned char nibble; int decode_top_nibble_next = 0; int end_of_packet = 0; int diff_channel; if (avctx->block_align != 0 && buf_size > avctx->block_align) buf_size = avctx->block_align; c->status[0].predictor = (int16_t)AV_RL16(src + 10); c->status[1].predictor = (int16_t)AV_RL16(src + 12); c->status[0].step_index = av_clip(src[14], 0, 88); c->status[1].step_index = av_clip(src[15], 0, 88); /* sign extend the predictors */ src += 16; diff_channel = c->status[1].predictor; /* the DK3_GET_NEXT_NIBBLE macro issues the break statement when * the buffer is consumed */ while (1) { /* for this algorithm, c->status[0] is the sum channel and * c->status[1] is the diff channel */ /* process the first predictor of the sum channel */ DK3_GET_NEXT_NIBBLE(); adpcm_ima_expand_nibble(&c->status[0], nibble, 3); /* process the diff channel predictor */ DK3_GET_NEXT_NIBBLE(); adpcm_ima_expand_nibble(&c->status[1], nibble, 3); /* process the first pair of stereo PCM samples */ diff_channel = (diff_channel + c->status[1].predictor) / 2; *samples++ = c->status[0].predictor + c->status[1].predictor; *samples++ = c->status[0].predictor - c->status[1].predictor; /* process the second predictor of the sum channel */ DK3_GET_NEXT_NIBBLE(); adpcm_ima_expand_nibble(&c->status[0], nibble, 3); /* process the second pair of stereo PCM samples */ diff_channel = (diff_channel + c->status[1].predictor) / 2; *samples++ = c->status[0].predictor + c->status[1].predictor; *samples++ = c->status[0].predictor - c->status[1].predictor; } break; } case CODEC_ID_ADPCM_IMA_ISS: for (channel = 0; channel < avctx->channels; channel++) { cs = &c->status[channel]; cs->predictor = (int16_t)bytestream_get_le16(&src); cs->step_index = av_clip(*src++, 0, 88); src++; } for (n = nb_samples >> (1 - st); n > 0; n--, src++) { uint8_t v1, v2; uint8_t v = *src; /* nibbles are swapped for mono */ if (st) { v1 = v >> 4; v2 = v & 0x0F; } else { v2 = v >> 4; v1 = v & 0x0F; } *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v1, 3); *samples++ = adpcm_ima_expand_nibble(&c->status[st], v2, 3); } break; case CODEC_ID_ADPCM_IMA_APC: while (src < buf + buf_size) { uint8_t v = *src++; *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4 , 3); *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3); } break; case CODEC_ID_ADPCM_IMA_WS: for (channel = 0; channel < avctx->channels; channel++) { const uint8_t *src0; int src_stride; int16_t *smp = samples + channel; if (c->vqa_version == 3) { src0 = src + channel * buf_size / 2; src_stride = 1; } else { src0 = src + channel; src_stride = avctx->channels; } for (n = nb_samples / 2; n > 0; n--) { uint8_t v = *src0; src0 += src_stride; *smp = adpcm_ima_expand_nibble(&c->status[channel], v >> 4 , 3); smp += avctx->channels; *smp = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3); smp += avctx->channels; } } src = buf + buf_size; break; case CODEC_ID_ADPCM_XA: while (buf_size >= 128) { xa_decode(samples, src, &c->status[0], &c->status[1], avctx->channels); src += 128; samples += 28 * 8; buf_size -= 128; } break; case CODEC_ID_ADPCM_IMA_EA_EACS: src += 4; // skip sample count (already read) for (i=0; i<=st; i++) c->status[i].step_index = av_clip(bytestream_get_le32(&src), 0, 88); for (i=0; i<=st; i++) c->status[i].predictor = bytestream_get_le32(&src); for (n = nb_samples >> (1 - st); n > 0; n--, src++) { *samples++ = adpcm_ima_expand_nibble(&c->status[0], *src>>4, 3); *samples++ = adpcm_ima_expand_nibble(&c->status[st], *src&0x0F, 3); } break; case CODEC_ID_ADPCM_IMA_EA_SEAD: for (n = nb_samples >> (1 - st); n > 0; n--, src++) { *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[0] >> 4, 6); *samples++ = adpcm_ima_expand_nibble(&c->status[st],src[0]&0x0F, 6); } break; case CODEC_ID_ADPCM_EA: { int32_t previous_left_sample, previous_right_sample; int32_t current_left_sample, current_right_sample; int32_t next_left_sample, next_right_sample; int32_t coeff1l, coeff2l, coeff1r, coeff2r; uint8_t shift_left, shift_right; /* Each EA ADPCM frame has a 12-byte header followed by 30-byte pieces, each coding 28 stereo samples. */ src += 4; // skip sample count (already read) current_left_sample = (int16_t)bytestream_get_le16(&src); previous_left_sample = (int16_t)bytestream_get_le16(&src); current_right_sample = (int16_t)bytestream_get_le16(&src); previous_right_sample = (int16_t)bytestream_get_le16(&src); for (count1 = 0; count1 < nb_samples / 28; count1++) { coeff1l = ea_adpcm_table[ *src >> 4 ]; coeff2l = ea_adpcm_table[(*src >> 4 ) + 4]; coeff1r = ea_adpcm_table[*src & 0x0F]; coeff2r = ea_adpcm_table[(*src & 0x0F) + 4]; src++; shift_left = 20 - (*src >> 4); shift_right = 20 - (*src & 0x0F); src++; for (count2 = 0; count2 < 28; count2++) { next_left_sample = sign_extend(*src >> 4, 4) << shift_left; next_right_sample = sign_extend(*src, 4) << shift_right; src++; next_left_sample = (next_left_sample + (current_left_sample * coeff1l) + (previous_left_sample * coeff2l) + 0x80) >> 8; next_right_sample = (next_right_sample + (current_right_sample * coeff1r) + (previous_right_sample * coeff2r) + 0x80) >> 8; previous_left_sample = current_left_sample; current_left_sample = av_clip_int16(next_left_sample); previous_right_sample = current_right_sample; current_right_sample = av_clip_int16(next_right_sample); *samples++ = (unsigned short)current_left_sample; *samples++ = (unsigned short)current_right_sample; } } if (src - buf == buf_size - 2) src += 2; // Skip terminating 0x0000 break; } case CODEC_ID_ADPCM_EA_MAXIS_XA: { int coeff[2][2], shift[2]; for(channel = 0; channel < avctx->channels; channel++) { for (i=0; i<2; i++) coeff[channel][i] = ea_adpcm_table[(*src >> 4) + 4*i]; shift[channel] = 20 - (*src & 0x0F); src++; } for (count1 = 0; count1 < nb_samples / 2; count1++) { for(i = 4; i >= 0; i-=4) { /* Pairwise samples LL RR (st) or LL LL (mono) */ for(channel = 0; channel < avctx->channels; channel++) { int32_t sample = sign_extend(src[channel] >> i, 4) << shift[channel]; sample = (sample + c->status[channel].sample1 * coeff[channel][0] + c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8; c->status[channel].sample2 = c->status[channel].sample1; c->status[channel].sample1 = av_clip_int16(sample); *samples++ = c->status[channel].sample1; } } src+=avctx->channels; } /* consume whole packet */ src = buf + buf_size; break; } case CODEC_ID_ADPCM_EA_R1: case CODEC_ID_ADPCM_EA_R2: case CODEC_ID_ADPCM_EA_R3: { /* channel numbering 2chan: 0=fl, 1=fr 4chan: 0=fl, 1=rl, 2=fr, 3=rr 6chan: 0=fl, 1=c, 2=fr, 3=rl, 4=rr, 5=sub */ const int big_endian = avctx->codec->id == CODEC_ID_ADPCM_EA_R3; int32_t previous_sample, current_sample, next_sample; int32_t coeff1, coeff2; uint8_t shift; unsigned int channel; uint16_t *samplesC; const uint8_t *srcC; const uint8_t *src_end = buf + buf_size; int count = 0; src += 4; // skip sample count (already read) for (channel=0; channel<avctx->channels; channel++) { int32_t offset = (big_endian ? bytestream_get_be32(&src) : bytestream_get_le32(&src)) + (avctx->channels-channel-1) * 4; if ((offset < 0) || (offset >= src_end - src - 4)) break; srcC = src + offset; samplesC = samples + channel; if (avctx->codec->id == CODEC_ID_ADPCM_EA_R1) { current_sample = (int16_t)bytestream_get_le16(&srcC); previous_sample = (int16_t)bytestream_get_le16(&srcC); } else { current_sample = c->status[channel].predictor; previous_sample = c->status[channel].prev_sample; } for (count1 = 0; count1 < nb_samples / 28; count1++) { if (*srcC == 0xEE) { /* only seen in R2 and R3 */ srcC++; if (srcC > src_end - 30*2) break; current_sample = (int16_t)bytestream_get_be16(&srcC); previous_sample = (int16_t)bytestream_get_be16(&srcC); for (count2=0; count2<28; count2++) { *samplesC = (int16_t)bytestream_get_be16(&srcC); samplesC += avctx->channels; } } else { coeff1 = ea_adpcm_table[ *srcC>>4 ]; coeff2 = ea_adpcm_table[(*srcC>>4) + 4]; shift = 20 - (*srcC++ & 0x0F); if (srcC > src_end - 14) break; for (count2=0; count2<28; count2++) { if (count2 & 1) next_sample = sign_extend(*srcC++, 4) << shift; else next_sample = sign_extend(*srcC >> 4, 4) << shift; next_sample += (current_sample * coeff1) + (previous_sample * coeff2); next_sample = av_clip_int16(next_sample >> 8); previous_sample = current_sample; current_sample = next_sample; *samplesC = current_sample; samplesC += avctx->channels; } } } if (!count) { count = count1; } else if (count != count1) { av_log(avctx, AV_LOG_WARNING, "per-channel sample count mismatch\n"); count = FFMAX(count, count1); } if (avctx->codec->id != CODEC_ID_ADPCM_EA_R1) { c->status[channel].predictor = current_sample; c->status[channel].prev_sample = previous_sample; } } c->frame.nb_samples = count * 28; src = src_end; break; } case CODEC_ID_ADPCM_EA_XAS: for (channel=0; channel<avctx->channels; channel++) { int coeff[2][4], shift[4]; short *s2, *s = &samples[channel]; for (n=0; n<4; n++, s+=32*avctx->channels) { for (i=0; i<2; i++) coeff[i][n] = ea_adpcm_table[(src[0]&0x0F)+4*i]; shift[n] = 20 - (src[2] & 0x0F); for (s2=s, i=0; i<2; i++, src+=2, s2+=avctx->channels) s2[0] = (src[0]&0xF0) + (src[1]<<8); } for (m=2; m<32; m+=2) { s = &samples[m*avctx->channels + channel]; for (n=0; n<4; n++, src++, s+=32*avctx->channels) { for (s2=s, i=0; i<8; i+=4, s2+=avctx->channels) { int level = sign_extend(*src >> (4 - i), 4) << shift[n]; int pred = s2[-1*avctx->channels] * coeff[0][n] + s2[-2*avctx->channels] * coeff[1][n]; s2[0] = av_clip_int16((level + pred + 0x80) >> 8); } } } } break; case CODEC_ID_ADPCM_IMA_AMV: case CODEC_ID_ADPCM_IMA_SMJPEG: if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV) { c->status[0].predictor = sign_extend(bytestream_get_le16(&src), 16); c->status[0].step_index = av_clip(bytestream_get_le16(&src), 0, 88); src += 4; } else { c->status[0].predictor = sign_extend(bytestream_get_be16(&src), 16); c->status[0].step_index = av_clip(bytestream_get_byte(&src), 0, 88); src += 1; } for (n = nb_samples >> (1 - st); n > 0; n--, src++) { char hi, lo; lo = *src & 0x0F; hi = *src >> 4; if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV) FFSWAP(char, hi, lo); *samples++ = adpcm_ima_expand_nibble(&c->status[0], lo, 3); *samples++ = adpcm_ima_expand_nibble(&c->status[0], hi, 3); } break; case CODEC_ID_ADPCM_CT: for (n = nb_samples >> (1 - st); n > 0; n--, src++) { uint8_t v = *src; *samples++ = adpcm_ct_expand_nibble(&c->status[0 ], v >> 4 ); *samples++ = adpcm_ct_expand_nibble(&c->status[st], v & 0x0F); } break; case CODEC_ID_ADPCM_SBPRO_4: case CODEC_ID_ADPCM_SBPRO_3: case CODEC_ID_ADPCM_SBPRO_2: if (!c->status[0].step_index) { /* the first byte is a raw sample */ *samples++ = 128 * (*src++ - 0x80); if (st) *samples++ = 128 * (*src++ - 0x80); c->status[0].step_index = 1; nb_samples--; } if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_4) { for (n = nb_samples >> (1 - st); n > 0; n--, src++) { *samples++ = adpcm_sbpro_expand_nibble(&c->status[0], src[0] >> 4, 4, 0); *samples++ = adpcm_sbpro_expand_nibble(&c->status[st], src[0] & 0x0F, 4, 0); } } else if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_3) { for (n = nb_samples / 3; n > 0; n--, src++) { *samples++ = adpcm_sbpro_expand_nibble(&c->status[0], src[0] >> 5 , 3, 0); *samples++ = adpcm_sbpro_expand_nibble(&c->status[0], (src[0] >> 2) & 0x07, 3, 0); *samples++ = adpcm_sbpro_expand_nibble(&c->status[0], src[0] & 0x03, 2, 0); } } else { for (n = nb_samples >> (2 - st); n > 0; n--, src++) { *samples++ = adpcm_sbpro_expand_nibble(&c->status[0], src[0] >> 6 , 2, 2); *samples++ = adpcm_sbpro_expand_nibble(&c->status[st], (src[0] >> 4) & 0x03, 2, 2); *samples++ = adpcm_sbpro_expand_nibble(&c->status[0], (src[0] >> 2) & 0x03, 2, 2); *samples++ = adpcm_sbpro_expand_nibble(&c->status[st], src[0] & 0x03, 2, 2); } } break; case CODEC_ID_ADPCM_SWF: { GetBitContext gb; const int *table; int k0, signmask, nb_bits, count; int size = buf_size*8; init_get_bits(&gb, buf, size); //read bits & initial values nb_bits = get_bits(&gb, 2)+2; //av_log(NULL,AV_LOG_INFO,"nb_bits: %d\n", nb_bits); table = swf_index_tables[nb_bits-2]; k0 = 1 << (nb_bits-2); signmask = 1 << (nb_bits-1); while (get_bits_count(&gb) <= size - 22*avctx->channels) { for (i = 0; i < avctx->channels; i++) { *samples++ = c->status[i].predictor = get_sbits(&gb, 16); c->status[i].step_index = get_bits(&gb, 6); } for (count = 0; get_bits_count(&gb) <= size - nb_bits*avctx->channels && count < 4095; count++) { int i; for (i = 0; i < avctx->channels; i++) { // similar to IMA adpcm int delta = get_bits(&gb, nb_bits); int step = ff_adpcm_step_table[c->status[i].step_index]; long vpdiff = 0; // vpdiff = (delta+0.5)*step/4 int k = k0; do { if (delta & k) vpdiff += step; step >>= 1; k >>= 1; } while(k); vpdiff += step; if (delta & signmask) c->status[i].predictor -= vpdiff; else c->status[i].predictor += vpdiff; c->status[i].step_index += table[delta & (~signmask)]; c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88); c->status[i].predictor = av_clip_int16(c->status[i].predictor); *samples++ = c->status[i].predictor; } } } src += buf_size; break; } case CODEC_ID_ADPCM_YAMAHA: for (n = nb_samples >> (1 - st); n > 0; n--, src++) { uint8_t v = *src; *samples++ = adpcm_yamaha_expand_nibble(&c->status[0 ], v & 0x0F); *samples++ = adpcm_yamaha_expand_nibble(&c->status[st], v >> 4 ); } break; case CODEC_ID_ADPCM_THP: { int table[2][16]; int prev[2][2]; int ch; src += 4; // skip channel size src += 4; // skip number of samples (already read) for (i = 0; i < 32; i++) table[0][i] = (int16_t)bytestream_get_be16(&src); /* Initialize the previous sample. */ for (i = 0; i < 4; i++) prev[0][i] = (int16_t)bytestream_get_be16(&src); for (ch = 0; ch <= st; ch++) { samples = (short *)c->frame.data[0] + ch; /* Read in every sample for this channel. */ for (i = 0; i < nb_samples / 14; i++) { int index = (*src >> 4) & 7; unsigned int exp = *src++ & 15; int factor1 = table[ch][index * 2]; int factor2 = table[ch][index * 2 + 1]; /* Decode 14 samples. */ for (n = 0; n < 14; n++) { int32_t sampledat; if(n&1) sampledat = sign_extend(*src++, 4); else sampledat = sign_extend(*src >> 4, 4); sampledat = ((prev[ch][0]*factor1 + prev[ch][1]*factor2) >> 11) + (sampledat << exp); *samples = av_clip_int16(sampledat); prev[ch][1] = prev[ch][0]; prev[ch][0] = *samples++; /* In case of stereo, skip one sample, this sample is for the other channel. */ samples += st; } } } break; } default: return -1; } *got_frame_ptr = 1; *(AVFrame *)data = c->frame; return src - buf; }