[FFmpeg-devel] [PATCH v4 1/6] Pass ogg/opus secondary header packets to the

[Romain Beauxis <romain.beauxis@gmail.com>]

These changes make it possible to access the initial header packets of
secondary chained ogg/opus bitstreams.

libavformat/oggparseopus.c: Parse extradata from
 secondary chained streams header packet.

libavformat/oggdec.c: Do not force ogg stream header parsing on
secondary ogg/opus chained streams.

libavcodec/opus/dec.c: Ignore opus header packets from secondary chained
streams.
---
 libavcodec/opus/dec.c      |  5 +++++
 libavformat/oggdec.c       |  4 ----
 libavformat/oggparseopus.c | 11 +++++++++++
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/libavcodec/opus/dec.c b/libavcodec/opus/dec.c
index 6c59dc1f46..88a650c81c 100644
--- a/libavcodec/opus/dec.c
+++ b/libavcodec/opus/dec.c
@@ -486,6 +486,11 @@ static int opus_decode_packet(AVCodecContext *avctx, AVFrame *frame,
     int delayed_samples = 0;
     int i, ret;
 
+    if (buf_size > 8 && (
+       !memcmp(buf, "OpusHead", 8) ||
+       !memcmp(buf, "OpusTags", 8)))
+        return buf_size;
+
     /* calculate the number of delayed samples */
     for (int i = 0; i < c->p.nb_streams; i++) {
         OpusStreamContext *s = &c->streams[i];
diff --git a/libavformat/oggdec.c b/libavformat/oggdec.c
index 5339fdd32c..4425279ce8 100644
--- a/libavformat/oggdec.c
+++ b/libavformat/oggdec.c
@@ -239,10 +239,6 @@ static int ogg_replace_stream(AVFormatContext *s, uint32_t serial, char *magic,
     os->start_trimming = 0;
     os->end_trimming = 0;
 
-    /* Chained files have extradata as a new packet */
-    if (codec == &ff_opus_codec)
-        os->header = -1;
-
     return i;
 }
 
diff --git a/libavformat/oggparseopus.c b/libavformat/oggparseopus.c
index 218e9df581..950b93bd31 100644
--- a/libavformat/oggparseopus.c
+++ b/libavformat/oggparseopus.c
@@ -125,6 +125,17 @@ static int opus_packet(AVFormatContext *avf, int idx)
         return AVERROR_INVALIDDATA;
     }
 
+    if (os->psize > 8 && !memcmp(packet, "OpusHead", 8)) {
+        if ((ret = ff_alloc_extradata(st->codecpar, os->psize)) < 0)
+            return ret;
+
+        memcpy(st->codecpar->extradata, packet, os->psize);
+        return 0;
+    }
+
+    if (os->psize > 8 && !memcmp(packet, "OpusTags", 8))
+        return 0;
+
     if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && !(os->flags & OGG_FLAG_EOS)) {
         int seg, d;
         int duration;
-- 
2.39.5 (Apple Git-154)

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