static av_cold int ape_decode_init(AVCodecContext * avctx) { APEContext *s = avctx->priv_data; int i; if (avctx->extradata_size != 6) { av_log(avctx, AV_LOG_ERROR, "Incorrect extradata\n"); return -1; } if (avctx->bits_per_coded_sample != 16) { av_log(avctx, AV_LOG_ERROR, "Only 16-bit samples are supported\n"); return -1; } if (avctx->channels > 2) { av_log(avctx, AV_LOG_ERROR, "Only mono and stereo is supported\n"); return -1; } s->avctx = avctx; s->channels = avctx->channels; s->fileversion = AV_RL16(avctx->extradata); s->compression_level = AV_RL16(avctx->extradata + 2); s->flags = AV_RL16(avctx->extradata + 4); av_log(avctx, AV_LOG_DEBUG, "Compression Level: %d - Flags: %d\n", s->compression_level, s->flags); if (s->compression_level % 1000 || s->compression_level > COMPRESSION_LEVEL_INSANE) { av_log(avctx, AV_LOG_ERROR, "Incorrect compression level %d\n", s->compression_level); return -1; } s->fset = s->compression_level / 1000 - 1; for (i = 0; i < APE_FILTER_LEVELS; i++) { if (!ape_filter_orders[s->fset][i]) break; s->filterbuf[i] = av_malloc((ape_filter_orders[s->fset][i] * 3 + HISTORY_SIZE) * 4); } dsputil_init(&s->dsp, avctx); avctx->sample_fmt = AV_SAMPLE_FMT_S16; avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO; return 0; }