libavformat/flvenc: refactoring: extracted method for writing codec headers

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/flvenc.c

@@ -343,12 +343,74 @@ static int unsupported_codec(AVFormatContext *s,
     return AVERROR(ENOSYS);
 }
 
+static void flv_write_codec_header(AVFormatContext* s, AVCodecParameters* par) {
+    int64_t data_size;
+    AVIOContext *pb = s->pb;
+    FLVContext *flv = s->priv_data;
+
+    if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
+            || par->codec_id == AV_CODEC_ID_MPEG4) {
+        int64_t pos;
+        avio_w8(pb,
+                par->codec_type == AVMEDIA_TYPE_VIDEO ?
+                        FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
+        avio_wb24(pb, 0); // size patched later
+        avio_wb24(pb, 0); // ts
+        avio_w8(pb, 0);   // ts ext
+        avio_wb24(pb, 0); // streamid
+        pos = avio_tell(pb);
+        if (par->codec_id == AV_CODEC_ID_AAC) {
+            avio_w8(pb, get_audio_flags(s, par));
+            avio_w8(pb, 0); // AAC sequence header
+
+            if (!par->extradata_size && flv->flags & 1) {
+                PutBitContext pbc;
+                int samplerate_index;
+                int channels = flv->audio_par->channels
+                        - (flv->audio_par->channels == 8 ? 1 : 0);
+                uint8_t data[2];
+
+                for (samplerate_index = 0; samplerate_index < 16;
+                        samplerate_index++)
+                    if (flv->audio_par->sample_rate
+                            == mpeg4audio_sample_rates[samplerate_index])
+                        break;
+
+                init_put_bits(&pbc, data, sizeof(data));
+                put_bits(&pbc, 5, flv->audio_par->profile + 1); //profile
+                put_bits(&pbc, 4, samplerate_index); //sample rate index
+                put_bits(&pbc, 4, channels);
+                put_bits(&pbc, 1, 0); //frame length - 1024 samples
+                put_bits(&pbc, 1, 0); //does not depend on core coder
+                put_bits(&pbc, 1, 0); //is not extension
+                flush_put_bits(&pbc);
+
+                avio_w8(pb, data[0]);
+                avio_w8(pb, data[1]);
+
+                av_log(s, AV_LOG_WARNING, "AAC sequence header: %02x %02x.\n",
+                        data[0], data[1]);
+            }
+            avio_write(pb, par->extradata, par->extradata_size);
+        } else {
+            avio_w8(pb, par->codec_tag | FLV_FRAME_KEY); // flags
+            avio_w8(pb, 0); // AVC sequence header
+            avio_wb24(pb, 0); // composition time
+            ff_isom_write_avcc(pb, par->extradata, par->extradata_size);
+        }
+        data_size = avio_tell(pb) - pos;
+        avio_seek(pb, -data_size - 10, SEEK_CUR);
+        avio_wb24(pb, data_size);
+        avio_skip(pb, data_size + 10 - 3);
+        avio_wb32(pb, data_size + 11); // previous tag size
+    }
+}
+
 static int flv_write_header(AVFormatContext *s)
 {
     int i;
     AVIOContext *pb = s->pb;
     FLVContext *flv = s->priv_data;
-    int64_t data_size;
 
     for (i = 0; i < s->nb_streams; i++) {
         AVCodecParameters *par = s->streams[i]->codecpar;
@@ -446,57 +508,7 @@ static int flv_write_header(AVFormatContext *s)
     write_metadata(s, 0);
 
     for (i = 0; i < s->nb_streams; i++) {
-        AVCodecParameters *par = s->streams[i]->codecpar;
+        flv_write_codec_header(s, s->streams[i]->codecpar);
-        if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4) {
-            int64_t pos;
-            avio_w8(pb, par->codec_type == AVMEDIA_TYPE_VIDEO ?
-                    FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
-            avio_wb24(pb, 0); // size patched later
-            avio_wb24(pb, 0); // ts
-            avio_w8(pb, 0);   // ts ext
-            avio_wb24(pb, 0); // streamid
-            pos = avio_tell(pb);
-            if (par->codec_id == AV_CODEC_ID_AAC) {
-                avio_w8(pb, get_audio_flags(s, par));
-                avio_w8(pb, 0); // AAC sequence header
-
-                if (!par->extradata_size && flv->flags & 1) {
-                    PutBitContext pbc;
-                    int samplerate_index;
-                    int channels = flv->audio_par->channels - (flv->audio_par->channels == 8 ? 1 : 0);
-                    uint8_t data[2];
-
-                    for (samplerate_index = 0; samplerate_index < 16; samplerate_index++)
-                        if (flv->audio_par->sample_rate == mpeg4audio_sample_rates[samplerate_index])
-                            break;
-
-                    init_put_bits(&pbc, data, sizeof(data));
-                    put_bits(&pbc, 5, flv->audio_par->profile + 1); //profile
-                    put_bits(&pbc, 4, samplerate_index); //sample rate index
-                    put_bits(&pbc, 4, channels);
-                    put_bits(&pbc, 1, 0); //frame length - 1024 samples
-                    put_bits(&pbc, 1, 0); //does not depend on core coder
-                    put_bits(&pbc, 1, 0); //is not extension
-                    flush_put_bits(&pbc);
-
-                    avio_w8(pb, data[0]);
-                    avio_w8(pb, data[1]);
-
-                    av_log(s, AV_LOG_WARNING, "AAC sequence header: %02x %02x.\n", data[0], data[1]);
-                }
-                avio_write(pb, par->extradata, par->extradata_size);
-            } else {
-                avio_w8(pb, par->codec_tag | FLV_FRAME_KEY); // flags
-                avio_w8(pb, 0); // AVC sequence header
-                avio_wb24(pb, 0); // composition time
-                ff_isom_write_avcc(pb, par->extradata, par->extradata_size);
-            }
-            data_size = avio_tell(pb) - pos;
-            avio_seek(pb, -data_size - 10, SEEK_CUR);
-            avio_wb24(pb, data_size);
-            avio_skip(pb, data_size + 10 - 3);
-            avio_wb32(pb, data_size + 11); // previous tag size
-        }
     }
 
     return 0;