unified wav header parsing - added extradata support

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@1092 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libav/asf.c

@@ -745,7 +745,7 @@ static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
     ByteIOContext *pb = &s->pb;
     AVStream *st;
     ASFStream *asf_st;
-    int size, i, bps;
+    int size, i;
     INT64 gsize;
 
     av_set_pts_info(s, 32, 1, 1000); /* 32 bit pts in ms */
@@ -784,7 +784,7 @@ static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 	    asf->packet_size = asf->hdr.max_pktsize;
             asf->nb_packets = asf->hdr.packets_count;
         } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
-            int type, id, total_size;
+            int type, total_size;
             unsigned int tag1;
             INT64 pos1, pos2;
 
@@ -819,20 +819,7 @@ static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 	    st->codec.codec_type = type;
             st->codec.frame_rate = 1000000; // us
             if (type == CODEC_TYPE_AUDIO) {
-                id = get_le16(pb);
-                st->codec.codec_tag = id;
-                st->codec.channels = get_le16(pb);
-		st->codec.sample_rate = get_le32(pb);
-                st->codec.bit_rate = get_le32(pb) * 8;
-		st->codec.block_align = get_le16(pb); /* block align */
-                bps = get_le16(pb); /* bits per sample */
-                st->codec.codec_id = wav_codec_get_id(id, bps);
-		size = get_le16(pb);
-		if (size > 0) {
-		    st->extra_data = av_mallocz(size);
-		    get_buffer(pb, st->extra_data, size);
-		    st->extra_data_size = size;
-		}
+                get_wav_header(pb, &st->codec, 1);
 		/* We have to init the frame size at some point .... */
 		pos2 = url_ftell(pb);
 		if (gsize > (pos2 + 8 - pos1 + 24)) {

libav/avi.h

@@ -17,6 +17,8 @@ typedef struct CodecTag {
 void put_bmp_header(ByteIOContext *pb, AVCodecContext *enc, CodecTag *tags);
 int put_wav_header(ByteIOContext *pb, AVCodecContext *enc);
 int wav_codec_get_id(unsigned int tag, int bps);
+void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, 
+                    int has_extra_data);
 
 extern CodecTag codec_bmp_tags[];
 extern CodecTag codec_wav_tags[];

libav/avidec.c

@@ -51,7 +51,7 @@ int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
     ByteIOContext *pb = &s->pb;
     UINT32 tag, tag1;
     int codec_type, stream_index, size, frame_period, bit_rate;
-    int i, bps;
+    int i;
     AVStream *st;
 
     /* check RIFF header */
@@ -160,19 +160,7 @@ int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
                     url_fskip(pb, size - 5 * 4);
                     break;
                 case CODEC_TYPE_AUDIO:
-                    tag1 = get_le16(pb);
-                    st->codec.codec_type = CODEC_TYPE_AUDIO;
-                    st->codec.codec_tag = tag1;
-#ifdef DEBUG
-                    printf("audio: 0x%x\n", tag1);
-#endif
-                    st->codec.channels = get_le16(pb);
-                    st->codec.sample_rate = get_le32(pb);
-                    st->codec.bit_rate = get_le32(pb) * 8;
-                    get_le16(pb); /* block align */
-                    bps = get_le16(pb);
-                    st->codec.codec_id = wav_codec_get_id(tag1, bps);
-                    url_fskip(pb, size - 4 * 4);
+                    get_wav_header(pb, &st->codec, (size >= 18));
                     break;
                 default:
                     url_fskip(pb, size);

libav/wav.c

 /* 
  * WAV encoder and decoder
- * Copyright (c) 2001 Fabrice Bellard.
+ * Copyright (c) 2001, 2002 Fabrice Bellard.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -29,6 +29,8 @@ CodecTag codec_wav_tags[] = {
     { CODEC_ID_PCM_MULAW, 0x07 },
     { CODEC_ID_ADPCM_MS, 0x02 },
     { CODEC_ID_ADPCM_IMA_WAV, 0x11 },
+    { CODEC_ID_WMAV1, 0x160 },
+    { CODEC_ID_WMAV2, 0x161 },
     { 0, 0 },
 };
 
@@ -101,6 +103,32 @@ int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
     return hdrsize;
 }
 
+void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, 
+                    int has_extra_data)
+{
+    int id, bps, size;
+
+    id = get_le16(pb);
+    codec->codec_type = CODEC_TYPE_AUDIO;
+    codec->codec_tag = id;
+    codec->fourcc = id;
+    codec->channels = get_le16(pb);
+    codec->sample_rate = get_le32(pb);
+    codec->bit_rate = get_le32(pb) * 8;
+    codec->block_align = get_le16(pb);
+    bps = get_le16(pb); /* bits per sample */
+    codec->codec_id = wav_codec_get_id(id, bps);
+    if (has_extra_data) {
+        size = get_le16(pb);
+        if (size > 0) {
+            codec->extradata = av_mallocz(size);
+            get_buffer(pb, codec->extradata, size);
+            codec->extradata_size = size;
+        }
+    }
+}
+
+
 int wav_codec_get_id(unsigned int tag, int bps)
 {
     int id;
@@ -213,8 +241,6 @@ static int wav_read_header(AVFormatContext *s,
     int size;
     unsigned int tag;
     ByteIOContext *pb = &s->pb;
-    unsigned int id, channels, rate, bit_rate, extra_size, bps;
-    unsigned int blkalign;
     AVStream *st;
 
     /* check RIFF header */
@@ -231,34 +257,15 @@ static int wav_read_header(AVFormatContext *s,
     size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
     if (size < 0)
         return -1;
-    id = get_le16(pb); 
-    channels = get_le16(pb);
-    rate = get_le32(pb);
-    bit_rate = get_le32(pb) * 8;
-    blkalign = get_le16(pb); /* block align */
-    bps = get_le16(pb); /* bits per sample */
-    if (size >= 18) {
-        /* wav_extra_size */
-        extra_size = get_le16(pb); 
-        /* skip unused data */
-        url_fseek(pb, size - 18, SEEK_CUR);
-    }
-
-    size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
-    if (size < 0)
-        return -1;
-    
-    /* now we are ready: build format streams */
     st = av_new_stream(s, 0);
     if (!st)
         return AVERROR_NOMEM;
 
-    st->codec.codec_type = CODEC_TYPE_AUDIO;
-    st->codec.codec_tag = id;
-    st->codec.codec_id = wav_codec_get_id(id, bps);
-    st->codec.channels = channels;
-    st->codec.sample_rate = rate;
-    st->codec.block_align = blkalign;
+    get_wav_header(pb, &st->codec, (size >= 18));
+    
+    size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
+    if (size < 0)
+        return -1;
     return 0;
 }