Andreas Rheinhardt:
> Andreas Rheinhardt:
>> When vobsub_read_packet() reads a packet, it uses a dedicated AVPacket
>> to get the subtitle timing and position from an FFDemuxSubtitlesQueue
>> (which has been filled with this data during reading the idx file in
>> vobsub_read_header); afterwards the actual subtitle data is read into
>> the packet destined for output and the timing and position are copied
>> to this packet. Afterwards, the local packet is unreferenced.
>>
>> This can be simplified: Simply use the output packet to get the timing
>> and position from the FFDemuxSubtitlesQueue. The packet's size will be
>> zero afterwards, so that it can be directly used to read the actual
>> subtitle data. This makes copying the packet fields as well as
>> unreferencing the local packet unecessary and also removes an instance
>> of usage of sizeof(AVPacket) in libavformat.
>>
>> The only difference is that the returned packet will already be flagged
>> as a keyframe. This currently only happens in compute_pkt_fields().
>>
>> Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@gmail.com>
>> ---
>> libavformat/mpeg.c | 23 +++++++----------------
>> 1 file changed, 7 insertions(+), 16 deletions(-)
>>
>> diff --git a/libavformat/mpeg.c b/libavformat/mpeg.c
>> index bd182e4429..7daa72f7ce 100644
>> --- a/libavformat/mpeg.c
>> +++ b/libavformat/mpeg.c
>> @@ -912,7 +912,6 @@ static int vobsub_read_packet(AVFormatContext *s,
>> AVPacket *pkt)
>> FFDemuxSubtitlesQueue *q;
>> AVIOContext *pb = vobsub->sub_ctx->pb;
>> int ret, psize, total_read = 0, i;
>> - AVPacket idx_pkt = { 0 };
>>
>> int64_t min_ts = INT64_MAX;
>> int sid = 0;
>> @@ -927,24 +926,22 @@ static int vobsub_read_packet(AVFormatContext *s,
>> AVPacket *pkt)
>> }
>> }
>> q = &vobsub->q[sid];
>> - ret = ff_subtitles_queue_read_packet(q, &idx_pkt);
>> + /* The returned packet will have size zero,
>> + * so that it can be directly used with av_grow_packet. */
>> + ret = ff_subtitles_queue_read_packet(q, pkt);
>> if (ret < 0)
>> return ret;
>>
>> /* compute maximum packet size using the next packet position. This is
>> * useful when the len in the header is non-sense */
>> if (q->current_sub_idx < q->nb_subs) {
>> - psize = q->subs[q->current_sub_idx].pos - idx_pkt.pos;
>> + psize = q->subs[q->current_sub_idx].pos - pkt->pos;
>> } else {
>> int64_t fsize = avio_size(pb);
>> - psize = fsize < 0 ? 0xffff : fsize - idx_pkt.pos;
>> + psize = fsize < 0 ? 0xffff : fsize - pkt->pos;
>> }
>>
>> - avio_seek(pb, idx_pkt.pos, SEEK_SET);
>> -
>> - av_init_packet(pkt);
>> - pkt->size = 0;
>> - pkt->data = NULL;
>> + avio_seek(pb, pkt->pos, SEEK_SET);
>>
>> do {
>> int n, to_read, startcode;
>> @@ -968,7 +965,7 @@ static int vobsub_read_packet(AVFormatContext *s,
>> AVPacket *pkt)
>> total_read += pkt_size;
>>
>> /* the current chunk doesn't match the stream index (unlikely) */
>> - if ((startcode & 0x1f) != s->streams[idx_pkt.stream_index]->id)
>> + if ((startcode & 0x1f) != s->streams[pkt->stream_index]->id)
>> break;
>>
>> ret = av_grow_packet(pkt, to_read);
>> @@ -980,16 +977,10 @@ static int vobsub_read_packet(AVFormatContext *s,
>> AVPacket *pkt)
>> pkt->size -= to_read - n;
>> } while (total_read < psize);
>>
>> - pkt->pts = pkt->dts = idx_pkt.pts;
>> - pkt->pos = idx_pkt.pos;
>> - pkt->stream_index = idx_pkt.stream_index;
>> -
>> - av_packet_unref(&idx_pkt);
>> return 0;
>>
>> fail:
>> av_packet_unref(pkt);
>> - av_packet_unref(&idx_pkt);
>> return ret;
>> }
>>
>>
> Ping.
>
> - Andreas
>
Another ping for the three unmerged patches of this patchset.
- Andreas
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