libavformat: ff_get_bmp_header: return esize too

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 76853a3e0c)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/avidec.c

@@ -578,6 +578,7 @@ static int avi_read_header(AVFormatContext *s)
                 avio_skip(pb, size);
             } else {
                 uint64_t cur_pos = avio_tell(pb);
+                unsigned esize;
                 if (cur_pos < list_end)
                     size = FFMIN(size, list_end - cur_pos);
                 st = s->streams[stream_index];
@@ -591,7 +592,7 @@ static int avi_read_header(AVFormatContext *s)
                         avio_skip(pb, size);
                         break;
                     }
-                    tag1 = ff_get_bmp_header(pb, st);
+                    tag1 = ff_get_bmp_header(pb, st, &esize);
 
                     if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
                         st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;

libavformat/riff.c

@@ -652,10 +652,11 @@ enum CodecID ff_wav_codec_get_id(unsigned int tag, int bps)
     return id;
 }
 
-int ff_get_bmp_header(AVIOContext *pb, AVStream *st)
+int ff_get_bmp_header(AVIOContext *pb, AVStream *st, unsigned *esize)
 {
     int tag1;
-    avio_rl32(pb); /* size */
+    if(esize) *esize = avio_rl32(pb);
+    else               avio_rl32(pb);
     st->codec->width = avio_rl32(pb);
     st->codec->height = (int32_t)avio_rl32(pb);
     avio_rl16(pb); /* planes */

libavformat/riff.h

@@ -44,7 +44,7 @@ void ff_end_tag(AVIOContext *pb, int64_t start);
  * bits_per_encoded_sample fields. Does not read extradata.
  * @return codec tag
  */
-int ff_get_bmp_header(AVIOContext *pb, AVStream *st);
+int ff_get_bmp_header(AVIOContext *pb, AVStream *st, unsigned *esize);
 
 void ff_put_bmp_header(AVIOContext *pb, AVCodecContext *enc, const AVCodecTag *tags, int for_asf);
 int ff_put_wav_header(AVIOContext *pb, AVCodecContext *enc);

libavformat/wtvdec.c

@@ -522,7 +522,7 @@ static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
     AVIOContext *pb = wtv->pb;
 
     avio_skip(pb, 72);  // picture aspect ratio is unreliable
-    ff_get_bmp_header(pb, st);
+    ff_get_bmp_header(pb, st, NULL);
 
     return 72 + 40;
 }