[FFmpeg-devel] [PATCH 2/2] lavf/assenc: handle extra sections after Events

[Rodger Combs]

> On Apr 4, 2015, at 08:47, wm4 <nfxjfg at googlemail.com> wrote:
> 
> On Sat,  4 Apr 2015 05:31:22 -0500
> Rodger Combs <rodger.combs at gmail.com <mailto:rodger.combs at gmail.com>> wrote:
> 
>> ---
>> libavformat/assenc.c | 28 ++++++++++++++++++++++++++--
>> 1 file changed, 26 insertions(+), 2 deletions(-)
>> 
>> diff --git a/libavformat/assenc.c b/libavformat/assenc.c
>> index 3fb9384..5222616 100644
>> --- a/libavformat/assenc.c
>> +++ b/libavformat/assenc.c
>> @@ -40,6 +40,8 @@ typedef struct ASSContext {
>>     int cache_size;
>>     int ssa_mode;
>>     int ignore_readorder;
>> +    uint8_t *trailer;
>> +    size_t trailer_size;
>> } ASSContext;
>> 
>> static int write_header(AVFormatContext *s)
>> @@ -55,8 +57,23 @@ static int write_header(AVFormatContext *s)
>>     ass->write_ts = avctx->codec_id == AV_CODEC_ID_ASS;
>>     avpriv_set_pts_info(s->streams[0], 64, 1, 100);
>>     if (avctx->extradata_size > 0) {
>> -        avio_write(s->pb, avctx->extradata, avctx->extradata_size);
>> -        if (avctx->extradata[avctx->extradata_size - 1] != '\n')
>> +        size_t header_size = avctx->extradata_size;
>> +        uint8_t *trailer = strstr(avctx->extradata, "\n[Events]");
>> +
>> +        if (trailer)
>> +            trailer = strstr(trailer, "Format:");
>> +        if (trailer)
>> +            trailer = strstr(trailer, "\n");
>> +
>> +        if (trailer++) {
>> +            header_size = (trailer - avctx->extradata);
>> +            ass->trailer_size = avctx->extradata_size - header_size;
>> +            if (ass->trailer_size)
>> +                ass->trailer = trailer;
>> +        }
>> +
>> +        avio_write(s->pb, avctx->extradata, header_size);
>> +        if (avctx->extradata[header_size - 1] != '\n')
>>             avio_write(s->pb, "\r\n", 2);
>>         ass->ssa_mode = !strstr(avctx->extradata, "\n[V4+ Styles]");
>>         if (!strstr(avctx->extradata, "\n[Events]"))
>> @@ -192,7 +209,14 @@ static int write_packet(AVFormatContext *s, AVPacket *pkt)
>> 
>> static int write_trailer(AVFormatContext *s)
>> {
>> +    ASSContext *ass = s->priv_data;
>> +
>>     purge_dialogues(s, 1);
>> +
>> +    if (ass->trailer) {
>> +        avio_write(s->pb, ass->trailer, ass->trailer_size);
>> +    }
>> +
>>     return 0;
>> }
>> 
> 
> What extra sections are these? Fonts?
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"Aegisub Extra Data". Generally it's script stuff.