vqf/twinvq: pass vqf COMM chunk info in extradata

This is needed because the twinvq decoder cannot rely on bit_rate to be set.
The API documentation says that bit_rate is set by libavcodec, not by the
user.

1 files changed, 11 insertions, 3 deletions

diff --git a/libavformat/vqf.c b/libavformat/vqf.c
index 4650a0b500..f2c1d8f146 100644
--- a/libavformat/vqf.c
+++ b/libavformat/vqf.c
@@ -70,6 +70,7 @@ static int vqf_read_header(AVFormatContext *s, AVFormatParameters *ap)
     int header_size;
     int read_bitrate = 0;
     int size;
+    uint8_t comm_chunk[12];
 
     if (!st)
         return AVERROR(ENOMEM);
@@ -100,9 +101,10 @@ static int vqf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 
         switch(chunk_tag){
         case MKTAG('C','O','M','M'):
-            st->codec->channels = avio_rb32(s->pb) + 1;
-            read_bitrate        = avio_rb32(s->pb);
-            rate_flag           = avio_rb32(s->pb);
+            avio_read(s->pb, comm_chunk, 12);
+            st->codec->channels = AV_RB32(comm_chunk    ) + 1;
+            read_bitrate        = AV_RB32(comm_chunk + 4);
+            rate_flag           = AV_RB32(comm_chunk + 8);
             avio_skip(s->pb, len-12);
 
             st->codec->bit_rate              = read_bitrate*1000;
@@ -192,6 +194,12 @@ static int vqf_read_header(AVFormatContext *s, AVFormatParameters *ap)
     c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate;
     av_set_pts_info(st, 64, 1, st->codec->sample_rate);
 
+    /* put first 12 bytes of COMM chunk in extradata */
+    if (!(st->codec->extradata = av_malloc(12 + FF_INPUT_BUFFER_PADDING_SIZE)))
+        return AVERROR(ENOMEM);
+    st->codec->extradata_size = 12;
+    memcpy(st->codec->extradata, comm_chunk, 12);
+
     return 0;
 }