On 8/24/2023 6:52 AM, Paul B Mahol wrote:
Patches attached.
Stereo decoding have some issues with some predictors so not yet bitexact.
Please comment.
+static av_cold int osq_close(AVCodecContext *avctx)
+{
+ OSQContext *s = avctx->priv_data;
+
+ av_freep(&s->bitstream);
+ s->bitstream_size = 0;
+
+ for (int ch = 0; ch < avctx->ch_layout.nb_channels; ch++)
FFMIN(avctx->ch_layout.nb_channels, 2);
This being a FF_CODEC_CAP_INIT_CLEANUP decoder, osq_close() could be
called before osq_init() has a chance to validate nb_channels.
+ av_freep(&s->decode_buffer[ch]);
+
+ return 0;
+}
+
static av_cold int osq_init(AVCodecContext *avctx)
+{
+ OSQContext *s = avctx->priv_data;
+
+ if (avctx->extradata_size < 48)
+ return AVERROR(EINVAL);
+
+ if (avctx->extradata[0] != 1) {
+ av_log(avctx, AV_LOG_ERROR, "Unsupported version.\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ avctx->sample_rate = AV_RL32(avctx->extradata + 4);
+ if (avctx->sample_rate < 1)
+ return AVERROR_INVALIDDATA;
+
+ avctx->ch_layout.nb_channels = avctx->extradata[3];
You'd need to uninit ch_layout first, as the user may have filled it
with something (as is the case with the lavf demuxer).
+ if (avctx->ch_layout.nb_channels < 1)
+ return AVERROR_INVALIDDATA;
+
+ switch (avctx->extradata[2]) {
+ case 8: avctx->sample_fmt = AV_SAMPLE_FMT_U8P; break;
+ case 16: avctx->sample_fmt = AV_SAMPLE_FMT_S16P; break;
+ case 20:
+ case 24:
+ case 28:
+ case 32: avctx->sample_fmt = AV_SAMPLE_FMT_S32P; break;
+ default: return AVERROR_INVALIDDATA;
+ }
+
+ s->nb_samples = AV_RL64(avctx->extradata + 16);
+ s->frame_samples = AV_RL16(avctx->extradata + 8);
+ s->max_framesize = (s->frame_samples * 16 + 1024) *
avctx->ch_layout.nb_channels;
Do you even need to propagate this header using extradata? You can set
codecpar's sample_fmt and frame_size in the demuxer, much like you're
doing for sample_rate and ch_layout.
There doesn't seem to be a value that can't be propagated using the
proper existing fields here.
+
+ s->bitstream = av_calloc(s->max_framesize + AV_INPUT_BUFFER_PADDING_SIZE,
sizeof(*s->bitstream));
av_mallocz(). sizeof(*s->bitstream) is 1.
+ if (!s->bitstream)
+ return AVERROR(ENOMEM);
+
+ for (int ch = 0; ch < avctx->ch_layout.nb_channels; ch++) {
+ s->decode_buffer[ch] = av_calloc(s->frame_samples + 4,
+ sizeof(*s->decode_buffer[ch]));
+ if (!s->decode_buffer[ch])
+ return AVERROR(ENOMEM);
+ }
+
+ s->pkt = avctx->internal->in_pkt;
+
+ return 0;
+}
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