From 456a70aeb826b7b84d30cc3cc279fa7c65fc7d4e Mon Sep 17 00:00:00 2001
From: Peter Ross <pross@xvid.org>
Date: Sun, 26 Dec 2010 01:23:44 +0000
Subject: add ff_get_bmp_header

Originally committed as revision 26091 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/avidec.c | 12 +-----------
 libavformat/riff.c   | 17 +++++++++++++++++
 libavformat/riff.h   |  7 +++++++
 3 files changed, 25 insertions(+), 11 deletions(-)

(limited to 'libavformat')

diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index d31af67620..15f48e8ac7 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -570,17 +570,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
                         url_fskip(pb, size);
                         break;
                     }
-                    get_le32(pb); /* size */
-                    st->codec->width = get_le32(pb);
-                    st->codec->height = (int32_t)get_le32(pb);
-                    get_le16(pb); /* panes */
-                    st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
-                    tag1 = get_le32(pb);
-                    get_le32(pb); /* ImageSize */
-                    get_le32(pb); /* XPelsPerMeter */
-                    get_le32(pb); /* YPelsPerMeter */
-                    get_le32(pb); /* ClrUsed */
-                    get_le32(pb); /* ClrImportant */
+                    tag1 = ff_get_bmp_header(pb, st);
 
                     if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
                         st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
diff --git a/libavformat/riff.c b/libavformat/riff.c
index 0fb2fd6d9e..3d584a3779 100644
--- a/libavformat/riff.c
+++ b/libavformat/riff.c
@@ -440,6 +440,23 @@ int ff_put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
     return hdrsize;
 }
 
+int ff_get_bmp_header(ByteIOContext *pb, AVStream *st)
+{
+    int tag1;
+    get_le32(pb); /* size */
+    st->codec->width = get_le32(pb);
+    st->codec->height = (int32_t)get_le32(pb);
+    get_le16(pb); /* planes */
+    st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
+    tag1 = get_le32(pb);
+    get_le32(pb); /* ImageSize */
+    get_le32(pb); /* XPelsPerMeter */
+    get_le32(pb); /* YPelsPerMeter */
+    get_le32(pb); /* ClrUsed */
+    get_le32(pb); /* ClrImportant */
+    return tag1;
+}
+
 /* BITMAPINFOHEADER header */
 void ff_put_bmp_header(ByteIOContext *pb, AVCodecContext *enc, const AVCodecTag *tags, int for_asf)
 {
diff --git a/libavformat/riff.h b/libavformat/riff.h
index 64d9eb6e3d..5045abcd31 100644
--- a/libavformat/riff.h
+++ b/libavformat/riff.h
@@ -35,6 +35,13 @@
 int64_t ff_start_tag(ByteIOContext *pb, const char *tag);
 void ff_end_tag(ByteIOContext *pb, int64_t start);
 
+/**
+ * Read BITMAPINFOHEADER structure and set AVStream codec width, height and
+ * bits_per_encoded_sample fields. Does not read extradata.
+ * @return codec tag
+ */
+int ff_get_bmp_header(ByteIOContext *pb, AVStream *st);
+
 void ff_put_bmp_header(ByteIOContext *pb, AVCodecContext *enc, const AVCodecTag *tags, int for_asf);
 int ff_put_wav_header(ByteIOContext *pb, AVCodecContext *enc);
 enum CodecID ff_wav_codec_get_id(unsigned int tag, int bps);
-- 
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