[FFmpeg-devel] [PATCH] avformat/cafenc: fixed packet_size calculation

[sergey radionov <rsatom@gmail.com>]

the problem is the very last packet
can be shorter than default packet_size
so it's required to exclude it from
packet_size calculations.
fixes #10465
---
 libavformat/cafenc.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/libavformat/cafenc.c b/libavformat/cafenc.c
index 67be59806c..fcc4838392 100644
--- a/libavformat/cafenc.c
+++ b/libavformat/cafenc.c
@@ -34,6 +34,8 @@ typedef struct {
     int size_buffer_size;
     int size_entries_used;
     int packets;
+    int64_t duration;
+    int64_t last_packet_duration;
 } CAFContext;
 
 static uint32_t codec_flags(enum AVCodecID codec_id) {
@@ -238,6 +240,8 @@ static int caf_write_packet(AVFormatContext *s, AVPacket *pkt)
                 pkt_sizes[caf->size_entries_used++] = 128 | top;
         }
         pkt_sizes[caf->size_entries_used++] = pkt->size & 127;
+        caf->duration += pkt->duration;
+        caf->last_packet_duration = pkt->duration;
         caf->packets++;
     }
     avio_write(s->pb, pkt->data, pkt->size);
@@ -259,7 +263,11 @@ static int caf_write_trailer(AVFormatContext *s)
         if (!par->block_align) {
             int packet_size = samples_per_packet(par);
             if (!packet_size) {
-                packet_size = st->duration / (caf->packets - 1);
+                if (caf->duration) {
+                    packet_size = (caf->duration - caf->last_packet_duration) / (caf->packets - 1);
+                } else {
+                    packet_size = st->duration / (caf->packets - 1);
+                }
                 avio_seek(pb, FRAME_SIZE_OFFSET, SEEK_SET);
                 avio_wb32(pb, packet_size);
             }
-- 
2.40.1

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