ad_spdif: better PTS sync

pts_bytes can't just be changed at the end. It must be offset to the pts
value, which is reset with each packet read from the demuxer. Make sure
the pts_byte field is always reset after receiving a new PTS, i.e.
increment it after actually writing to the output buffer.

Flush the AVFormatContext's write buffer, because otherwise the audio
PTS will jump around too much: the calculation doesn't use the exact
output buffer size if there's still data in the avio buffer.

1 files changed, 3 insertions, 1 deletions

diff --git a/audio/decode/ad_spdif.c b/audio/decode/ad_spdif.c
index f4fc430208..d0fa43aa25 100644
--- a/audio/decode/ad_spdif.c
+++ b/audio/decode/ad_spdif.c
@@ -220,12 +220,14 @@ static int decode_audio(sh_audio_t *sh, unsigned char *buf,
             sh->pts       = mpkt->pts;
             sh->pts_bytes = 0;
         }
+        int out_len = spdif_ctx->out_buffer_len;
         int ret = lavf_ctx->oformat->write_packet(lavf_ctx, &pkt);
+        avio_flush(lavf_ctx->pb);
+        sh->pts_bytes += spdif_ctx->out_buffer_len - out_len;
         talloc_free(mpkt);
         if (ret < 0)
             break;
     }
-    sh->pts_bytes += spdif_ctx->out_buffer_len;
     return spdif_ctx->out_buffer_len;
 }