On Thu, Nov 10, 2011 at 10:44:55AM -0500, Justin Ruggles wrote:
> The Musepack SV7 reference encoder converts mono to stereo when encoding.
> ---
> libavcodec/mpc7.c | 9 ++++++++-
> 1 files changed, 8 insertions(+), 1 deletions(-)
>
> diff --git a/libavcodec/mpc7.c b/libavcodec/mpc7.c
> index 6f79c7b..fea60a1 100644
> --- a/libavcodec/mpc7.c
> +++ b/libavcodec/mpc7.c
> @@ -61,6 +61,13 @@ static av_cold int mpc7_decode_init(AVCodecContext * avctx)
> static VLC_TYPE hdr_table[1 << MPC7_HDR_BITS][2];
> static VLC_TYPE quant_tables[7224][2];
>
> + /* Musepack SV7 is always stereo */
> + if (avctx->channels != 2) {
> + av_log_ask_for_sample(avctx, "Unsupported number of channels: %d\n",
> + avctx->channels);
> + return AVERROR_PATCHWELCOME;
> + }
> +
> if(avctx->extradata_size < 16){
> av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n",
> avctx->extradata_size);
> return -1;
> @@ -88,7 +95,7 @@ static av_cold int mpc7_decode_init(AVCodecContext * avctx)
> c->frames_to_skip = 0;
>
> avctx->sample_fmt = AV_SAMPLE_FMT_S16;
> - avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO :
> AV_CH_LAYOUT_MONO;
> + avctx->channel_layout = AV_CH_LAYOUT_STEREO;
>
> if(vlc_initialized) return 0;
> av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
> --
Yes, but it still lies to be mono. There was an issue with one such file.
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