correct pcm in flv handling

Originally committed as revision 3968 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/flvdec.c

@@ -60,7 +60,7 @@ static int flv_read_header(AVFormatContext *s,
 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     int ret, i, type, size, pts, flags, is_audio;
-    AVStream *st;
+    AVStream *st = NULL;
     
  for(;;){
     url_fskip(&s->pb, 4); /* size of previous packet */
@@ -122,7 +122,12 @@ static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
             else
                 st->codec.sample_rate = (44100<<((flags>>2)&3))>>3;
             switch(flags >> 4){/* 0: uncompressed 1: ADPCM 2: mp3 5: Nellymoser 8kHz mono 6: Nellymoser*/
+	    case 0: if (flags&2) st->codec.codec_id = CODEC_ID_PCM_S16BE;
+		    else st->codec.codec_id = CODEC_ID_PCM_S8; break;
             case 2: st->codec.codec_id = CODEC_ID_MP3; break;
+	    // this is not listed at FLV but at SWF, strange...
+	    case 3: if (flags&2) st->codec.codec_id = CODEC_ID_PCM_S16LE;
+		    else st->codec.codec_id = CODEC_ID_PCM_S8; break;
             default:
                 st->codec.codec_tag= (flags >> 4);
             }

libavformat/flvenc.c

@@ -35,7 +35,7 @@ static void put_be24(ByteIOContext *pb, int value)
 }
 
 static int get_audio_flags(AVCodecContext *enc){
-    int flags = 0x02;
+    int flags = 0;
 
     switch (enc->sample_rate) {
         case    44100:
@@ -61,7 +61,15 @@ static int get_audio_flags(AVCodecContext *enc){
     
     switch(enc->codec_id){
     case CODEC_ID_MP3:
-        flags |= 0x20;
+        flags |= 0x20 | 0x2;
+        break;
+    case CODEC_ID_PCM_S8:
+	break;
+    case CODEC_ID_PCM_S16BE:
+	flags |= 0x60 | 0x2;
+	break;
+    case CODEC_ID_PCM_S16LE:
+	flags |= 0x2;
 	break;
     case 0:
         flags |= enc->codec_tag<<4;
@@ -155,7 +163,7 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
     put_be32(pb,flv->reserved);
     put_byte(pb,flags);
     put_buffer(pb, pkt->data, size);
-    put_be32(pb,size+1+11); // reserved
+    put_be32(pb,size+1+11); // previous tag size
     
     put_flush_packet(pb);
     return 0;