static av_cold int adpcm_decode_init(AVCodecContext * avctx) { ADPCMDecodeContext *c = avctx->priv_data; unsigned int min_channels = 1; unsigned int max_channels = 2; switch(avctx->codec->id) { case AV_CODEC_ID_ADPCM_DTK: case AV_CODEC_ID_ADPCM_EA: min_channels = 2; break; case AV_CODEC_ID_ADPCM_AFC: case AV_CODEC_ID_ADPCM_EA_R1: case AV_CODEC_ID_ADPCM_EA_R2: case AV_CODEC_ID_ADPCM_EA_R3: case AV_CODEC_ID_ADPCM_EA_XAS: max_channels = 6; break; case AV_CODEC_ID_ADPCM_THP: case AV_CODEC_ID_ADPCM_THP_LE: max_channels = 10; break; } if (avctx->channels < min_channels || avctx->channels > max_channels) { av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n"); return AVERROR(EINVAL); } switch(avctx->codec->id) { case AV_CODEC_ID_ADPCM_CT: c->status[0].step = c->status[1].step = 511; break; case AV_CODEC_ID_ADPCM_IMA_WAV: if (avctx->bits_per_coded_sample < 2 || avctx->bits_per_coded_sample > 5) return AVERROR_INVALIDDATA; break; case AV_CODEC_ID_ADPCM_IMA_APC: if (avctx->extradata && avctx->extradata_size >= 8) { c->status[0].predictor = AV_RL32(avctx->extradata); c->status[1].predictor = AV_RL32(avctx->extradata + 4); } break; case AV_CODEC_ID_ADPCM_IMA_WS: if (avctx->extradata && avctx->extradata_size >= 2) c->vqa_version = AV_RL16(avctx->extradata); break; default: break; } switch(avctx->codec->id) { case AV_CODEC_ID_ADPCM_IMA_QT: case AV_CODEC_ID_ADPCM_IMA_WAV: case AV_CODEC_ID_ADPCM_4XM: case AV_CODEC_ID_ADPCM_XA: case AV_CODEC_ID_ADPCM_EA_R1: case AV_CODEC_ID_ADPCM_EA_R2: case AV_CODEC_ID_ADPCM_EA_R3: case AV_CODEC_ID_ADPCM_EA_XAS: case AV_CODEC_ID_ADPCM_THP: case AV_CODEC_ID_ADPCM_THP_LE: case AV_CODEC_ID_ADPCM_AFC: case AV_CODEC_ID_ADPCM_DTK: avctx->sample_fmt = AV_SAMPLE_FMT_S16P; break; case AV_CODEC_ID_ADPCM_IMA_WS: avctx->sample_fmt = c->vqa_version == 3 ? AV_SAMPLE_FMT_S16P : AV_SAMPLE_FMT_S16; break; default: avctx->sample_fmt = AV_SAMPLE_FMT_S16; } return 0; }