[libav-commits] flvenc: move metadata updates into a single function

Andrew Stone git at libav.org
Mon Nov 17 09:32:43 CET 2014


Module: libav
Branch: master
Commit: 4d0cd5f58c892276716f46f4b2702915e5018215

Author:    Andrew Stone <andrew at clovar.com>
Committer: Anton Khirnov <anton at khirnov.net>
Date:      Fri Nov  7 16:09:09 2014 -0500

flvenc: move metadata updates into a single function

Signed-off-by: Anton Khirnov <anton at khirnov.net>

---

 libavformat/flvenc.c |  193 +++++++++++++++++++++++++++-----------------------
 1 file changed, 103 insertions(+), 90 deletions(-)

diff --git a/libavformat/flvenc.c b/libavformat/flvenc.c
index cc4c782..7cb1f61 100644
--- a/libavformat/flvenc.c
+++ b/libavformat/flvenc.c
@@ -60,6 +60,11 @@ typedef struct FLVContext {
     int64_t filesize_offset;
     int64_t duration;
     int64_t delay;      ///< first dts delay (needed for AVC & Speex)
+
+    AVCodecContext *audio_enc;
+    AVCodecContext *video_enc;
+    double framerate;
+    AVCodecContext *data_enc;
 } FLVContext;
 
 typedef struct FLVStreamContext {
@@ -187,85 +192,14 @@ static void put_amf_bool(AVIOContext *pb, int b)
     avio_w8(pb, !!b);
 }
 
-static int flv_write_header(AVFormatContext *s)
+static void write_metadata(AVFormatContext *s)
 {
     AVIOContext *pb = s->pb;
     FLVContext *flv = s->priv_data;
-    AVCodecContext *audio_enc = NULL, *video_enc = NULL, *data_enc = NULL;
     int i, metadata_count = 0;
-    double framerate = 0.0;
     int64_t metadata_size_pos, data_size, metadata_count_pos;
     AVDictionaryEntry *tag = NULL;
 
-    for (i = 0; i < s->nb_streams; i++) {
-        AVCodecContext *enc = s->streams[i]->codec;
-        FLVStreamContext *sc;
-        switch (enc->codec_type) {
-        case AVMEDIA_TYPE_VIDEO:
-            if (s->streams[i]->avg_frame_rate.den &&
-                s->streams[i]->avg_frame_rate.num) {
-                framerate = av_q2d(s->streams[i]->avg_frame_rate);
-            }
-            if (video_enc) {
-                av_log(s, AV_LOG_ERROR,
-                       "at most one video stream is supported in flv\n");
-                return AVERROR(EINVAL);
-            }
-            video_enc = enc;
-            if (enc->codec_tag == 0) {
-                av_log(s, AV_LOG_ERROR, "video codec not compatible with flv\n");
-                return -1;
-            }
-            break;
-        case AVMEDIA_TYPE_AUDIO:
-            if (audio_enc) {
-                av_log(s, AV_LOG_ERROR,
-                       "at most one audio stream is supported in flv\n");
-                return AVERROR(EINVAL);
-            }
-            audio_enc = enc;
-            if (get_audio_flags(s, enc) < 0)
-                return AVERROR_INVALIDDATA;
-            break;
-        case AVMEDIA_TYPE_DATA:
-            if (enc->codec_id != AV_CODEC_ID_TEXT) {
-                av_log(s, AV_LOG_ERROR, "codec not compatible with flv\n");
-                return AVERROR_INVALIDDATA;
-            }
-            data_enc = enc;
-            break;
-        default:
-            av_log(s, AV_LOG_ERROR, "codec not compatible with flv\n");
-            return -1;
-        }
-        avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
-
-        sc = av_mallocz(sizeof(FLVStreamContext));
-        if (!sc)
-            return AVERROR(ENOMEM);
-        s->streams[i]->priv_data = sc;
-        sc->last_ts = -1;
-    }
-
-    flv->delay = AV_NOPTS_VALUE;
-
-    avio_write(pb, "FLV", 3);
-    avio_w8(pb, 1);
-    avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc +
-                FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
-    avio_wb32(pb, 9);
-    avio_wb32(pb, 0);
-
-    for (i = 0; i < s->nb_streams; i++)
-        if (s->streams[i]->codec->codec_tag == 5) {
-            avio_w8(pb, 8);     // message type
-            avio_wb24(pb, 0);   // include flags
-            avio_wb24(pb, 0);   // time stamp
-            avio_wb32(pb, 0);   // reserved
-            avio_wb32(pb, 11);  // size
-            flv->reserved = 5;
-        }
-
     /* write meta_tag */
     avio_w8(pb, 18);            // tag type META
     metadata_size_pos = avio_tell(pb);
@@ -282,57 +216,57 @@ static int flv_write_header(AVFormatContext *s)
     /* mixed array (hash) with size and string/type/data tuples */
     avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
     metadata_count_pos = avio_tell(pb);
-    metadata_count = 4 * !!video_enc +
-                     5 * !!audio_enc +
-                     1 * !!data_enc  +
+    metadata_count = 4 * !!flv->video_enc +
+                     5 * !!flv->audio_enc +
+                     1 * !!flv->data_enc  +
                      2; // +2 for duration and file size
 
     avio_wb32(pb, metadata_count);
 
     put_amf_string(pb, "duration");
-    flv->duration_offset= avio_tell(pb);
+    flv->duration_offset = avio_tell(pb);
 
     // fill in the guessed duration, it'll be corrected later if incorrect
     put_amf_double(pb, s->duration / AV_TIME_BASE);
 
-    if (video_enc) {
+    if (flv->video_enc) {
         put_amf_string(pb, "width");
-        put_amf_double(pb, video_enc->width);
+        put_amf_double(pb, flv->video_enc->width);
 
         put_amf_string(pb, "height");
-        put_amf_double(pb, video_enc->height);
+        put_amf_double(pb, flv->video_enc->height);
 
         put_amf_string(pb, "videodatarate");
-        put_amf_double(pb, video_enc->bit_rate / 1024.0);
+        put_amf_double(pb, flv->video_enc->bit_rate / 1024.0);
 
-        if (framerate != 0.0) {
+        if (flv->framerate != 0.0) {
             put_amf_string(pb, "framerate");
-            put_amf_double(pb, framerate);
+            put_amf_double(pb, flv->framerate);
             metadata_count++;
         }
 
         put_amf_string(pb, "videocodecid");
-        put_amf_double(pb, video_enc->codec_tag);
+        put_amf_double(pb, flv->video_enc->codec_tag);
     }
 
-    if (audio_enc) {
+    if (flv->audio_enc) {
         put_amf_string(pb, "audiodatarate");
-        put_amf_double(pb, audio_enc->bit_rate / 1024.0);
+        put_amf_double(pb, flv->audio_enc->bit_rate / 1024.0);
 
         put_amf_string(pb, "audiosamplerate");
-        put_amf_double(pb, audio_enc->sample_rate);
+        put_amf_double(pb, flv->audio_enc->sample_rate);
 
         put_amf_string(pb, "audiosamplesize");
-        put_amf_double(pb, audio_enc->codec_id == AV_CODEC_ID_PCM_U8 ? 8 : 16);
+        put_amf_double(pb, flv->audio_enc->codec_id == AV_CODEC_ID_PCM_U8 ? 8 : 16);
 
         put_amf_string(pb, "stereo");
-        put_amf_bool(pb, audio_enc->channels == 2);
+        put_amf_bool(pb, flv->audio_enc->channels == 2);
 
         put_amf_string(pb, "audiocodecid");
-        put_amf_double(pb, audio_enc->codec_tag);
+        put_amf_double(pb, flv->audio_enc->codec_tag);
     }
 
-    if (data_enc) {
+    if (flv->data_enc) {
         put_amf_string(pb, "datastream");
         put_amf_double(pb, 0.0);
     }
@@ -361,6 +295,85 @@ static int flv_write_header(AVFormatContext *s)
     avio_wb24(pb, data_size);
     avio_skip(pb, data_size + 10 - 3);
     avio_wb32(pb, data_size + 11);
+}
+
+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++) {
+        AVCodecContext *enc = s->streams[i]->codec;
+        FLVStreamContext *sc;
+        switch (enc->codec_type) {
+        case AVMEDIA_TYPE_VIDEO:
+            if (s->streams[i]->avg_frame_rate.den &&
+                s->streams[i]->avg_frame_rate.num) {
+                flv->framerate = av_q2d(s->streams[i]->avg_frame_rate);
+            }
+            if (flv->video_enc) {
+                av_log(s, AV_LOG_ERROR,
+                       "at most one video stream is supported in flv\n");
+                return AVERROR(EINVAL);
+            }
+            flv->video_enc = enc;
+            if (enc->codec_tag == 0) {
+                av_log(s, AV_LOG_ERROR, "video codec not compatible with flv\n");
+                return -1;
+            }
+            break;
+        case AVMEDIA_TYPE_AUDIO:
+            if (flv->audio_enc) {
+                av_log(s, AV_LOG_ERROR,
+                       "at most one audio stream is supported in flv\n");
+                return AVERROR(EINVAL);
+            }
+            flv->audio_enc = enc;
+            if (get_audio_flags(s, enc) < 0)
+                return AVERROR_INVALIDDATA;
+            break;
+        case AVMEDIA_TYPE_DATA:
+            if (enc->codec_id != AV_CODEC_ID_TEXT) {
+                av_log(s, AV_LOG_ERROR, "codec not compatible with flv\n");
+                return AVERROR_INVALIDDATA;
+            }
+            flv->data_enc = enc;
+            break;
+        default:
+            av_log(s, AV_LOG_ERROR, "codec not compatible with flv\n");
+            return -1;
+        }
+        avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
+
+        sc = av_mallocz(sizeof(FLVStreamContext));
+        if (!sc)
+            return AVERROR(ENOMEM);
+        s->streams[i]->priv_data = sc;
+        sc->last_ts = -1;
+    }
+
+    flv->delay = AV_NOPTS_VALUE;
+
+    avio_write(pb, "FLV", 3);
+    avio_w8(pb, 1);
+    avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!flv->audio_enc +
+                FLV_HEADER_FLAG_HASVIDEO * !!flv->video_enc);
+    avio_wb32(pb, 9);
+    avio_wb32(pb, 0);
+
+    for (i = 0; i < s->nb_streams; i++)
+        if (s->streams[i]->codec->codec_tag == 5) {
+            avio_w8(pb, 8);     // message type
+            avio_wb24(pb, 0);   // include flags
+            avio_wb24(pb, 0);   // time stamp
+            avio_wb32(pb, 0);   // reserved
+            avio_wb32(pb, 11);  // size
+            flv->reserved = 5;
+        }
+
+    write_metadata(s);
 
     for (i = 0; i < s->nb_streams; i++) {
         AVCodecContext *enc = s->streams[i]->codec;



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