[FFmpeg-devel] [PATCH 3/6] avformat/movenc: enable handle_eac3 to handle AC-3 tracks

[Jan Ekström]

From: Jan Ekström <jan.ekstrom at 24i.com>

Add the AC-3 frame type, as well as early exit from additional packet
parsing in case of AC-3, as only a single packet is required to get
the required information.

Signed-off-by: Jan Ekström <jan.ekstrom at 24i.com>
---
 libavformat/movenc.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 87cd066c95..c24b11cf5f 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -443,7 +443,8 @@ static int handle_eac3(MOVMuxContext *mov, AVPacket *pkt, MOVTrack *track)
 
         /* this should always be the case, given that our AC-3 parser
          * concatenates dependent frames to their independent parent */
-        if (hdr->frame_type == EAC3_FRAME_TYPE_INDEPENDENT) {
+        if (hdr->frame_type == EAC3_FRAME_TYPE_INDEPENDENT ||
+            hdr->frame_type == EAC3_FRAME_TYPE_AC3_CONVERT) {
             /* substream ids must be incremental */
             if (hdr->substreamid > info->num_ind_sub + 1) {
                 ret = AVERROR(EINVAL);
@@ -475,6 +476,14 @@ static int handle_eac3(MOVMuxContext *mov, AVPacket *pkt, MOVTrack *track)
         info->substream[hdr->substreamid].acmod = hdr->channel_mode;
         info->substream[hdr->substreamid].lfeon = hdr->lfe_on;
 
+        if (track->par->codec_id == AV_CODEC_ID_AC3) {
+            // with AC-3 we only require the information of a single packet,
+            // so we can finish as soon as the basic values of the bit stream
+            // have been set to the track's informational structure.
+            info->ec3_done = 1;
+            goto concatenate;
+        }
+
         /* Parse dependent substream(s), if any */
         if (pkt->size != hdr->frame_size) {
             int cumul_size = hdr->frame_size;
-- 
2.36.1