[FFmpeg-devel] [PATCH 4/5] ogg: allow streams to update metadata

[Ben Boeckel]

---
 libavformat/oggdec.c | 28 +++++++++++++++++++++++-----
 libavformat/oggdec.h |  2 ++
 2 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/libavformat/oggdec.c b/libavformat/oggdec.c
index 9f8d665..3c0617e 100644
--- a/libavformat/oggdec.c
+++ b/libavformat/oggdec.c
@@ -77,6 +77,8 @@ static int ogg_save(AVFormatContext *s)
         struct ogg_stream *os = ogg->streams + i;
         os->buf = av_mallocz(os->bufsize + FF_INPUT_BUFFER_PADDING_SIZE);
         memcpy(os->buf, ost->streams[i].buf, os->bufpos);
+        os->new_metadata      = NULL;
+        os->new_metadata_size = 0;
     }
 
     ogg->state = ost;
@@ -142,6 +144,9 @@ static int ogg_reset(AVFormatContext *s)
         if (start_pos <= s->data_offset) {
             os->lastpts = 0;
         }
+        av_free(os->new_metadata);
+        os->new_metadata      = NULL;
+        os->new_metadata_size = 0;
     }
 
     ogg->page_pos = -1;
@@ -243,11 +248,13 @@ static int ogg_new_stream(AVFormatContext *s, uint32_t serial)
     ogg->streams = os;
     os           = ogg->streams + idx;
     memset(os, 0, sizeof(*os));
-    os->serial        = serial;
-    os->bufsize       = DECODER_BUFFER_SIZE;
-    os->buf           = av_malloc(os->bufsize + FF_INPUT_BUFFER_PADDING_SIZE);
-    os->header        = -1;
-    os->start_granule = OGG_NOGRANULE_VALUE;
+    os->serial            = serial;
+    os->bufsize           = DECODER_BUFFER_SIZE;
+    os->buf               = av_malloc(os->bufsize + FF_INPUT_BUFFER_PADDING_SIZE);
+    os->header            = -1;
+    os->start_granule     = OGG_NOGRANULE_VALUE;
+    os->new_metadata      = NULL;
+    os->new_metadata_size = 0;
     if (!os->buf)
         return AVERROR(ENOMEM);
 
@@ -639,6 +646,7 @@ static int ogg_read_close(AVFormatContext *s)
             ogg->streams[i].codec->cleanup(s, i);
         }
         av_free(ogg->streams[i].private);
+        av_free(ogg->streams[i].new_metadata);
     }
     av_free(ogg->streams);
     return 0;
@@ -786,6 +794,16 @@ retry:
         AV_WL32(side_data + 4, os->end_trimming);
     }
 
+    if (os->new_metadata) {
+        uint8_t *side_data = av_packet_new_side_data(pkt,
+                                                     AV_PKT_DATA_STRINGS_METADATA,
+                                                     os->new_metadata_size);
+        memcpy(side_data, os->new_metadata, os->new_metadata_size);
+        av_free(os->new_metadata);
+        os->new_metadata = NULL;
+        os->new_metadata_size = 0;
+    }
+
     return psize;
 }
 
diff --git a/libavformat/oggdec.h b/libavformat/oggdec.h
index c31859f..cad1950 100644
--- a/libavformat/oggdec.h
+++ b/libavformat/oggdec.h
@@ -85,6 +85,8 @@ struct ogg_stream {
     int got_data;   ///< 1 if the stream got some data (non-initial packets), 0 otherwise
     int nb_header; ///< set to the number of parsed headers
     int end_trimming; ///< set the number of packets to drop from the end
+    uint8_t *new_metadata;
+    unsigned int new_metadata_size;
     void *private;
 };
 
-- 
1.8.3.1