Re: [FFmpeg-devel] [PATCH] avfilter/src_movie: activate & dr

[James Almer <jamrial@gmail.com>]

On 5/22/2023 11:48 AM, Anton Khirnov wrote:
> Quoting Paul B Mahol (2023-05-18 12:22:07)
>>  From af73b69a0be9033fddf222b6e9ac60799de85691 Mon Sep 17 00:00:00 2001
>> From: Paul B Mahol <onemda@gmail.com>
>> Date: Mon, 15 May 2023 21:54:25 +0200
>> Subject: [PATCH 26/27] avfilter/src_movie: dr support
>>
>> Signed-off-by: Paul B Mahol <onemda@gmail.com>
>> ---
>>   libavfilter/src_movie.c | 44 +++++++++++++++++++++++++++++++++++++++--
>>   1 file changed, 42 insertions(+), 2 deletions(-)
>>
>> diff --git a/libavfilter/src_movie.c b/libavfilter/src_movie.c
>> index 5937613d13..a2ecc5a625 100644
>> --- a/libavfilter/src_movie.c
>> +++ b/libavfilter/src_movie.c
>> @@ -23,7 +23,6 @@
>>    * @file
>>    * movie video source
>>    *
>> - * @todo use direct rendering (no allocation of a new frame)
>>    * @todo support a PTS correction mechanism
>>    */
>>   
>> @@ -156,6 +155,43 @@ static AVStream *find_stream(void *log, AVFormatContext *avf, const char *spec)
>>       return found;
>>   }
>>   
>> +static int get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
>> +{
>> +    int linesize_align[AV_NUM_DATA_POINTERS];
>> +    AVFilterLink *outlink = frame->opaque;
> 
> This is not guaranteed to be set. Use AVCodecContext.opaque instead.

How so? He set the AV_CODEC_FLAG_COPY_OPAQUE flag and the pkt.opaque 
field before calling avcodec_send_packet().

Also, this version is out of date. He pushed a more complete one (that 
could have sent to the list, admittedly).

> 
>> +    int w, h, ow, oh;
>> +    AVFrame *new;
>> +
>> +    h = oh = frame->height;
>> +    w = ow = frame->width;
>> +
>> +    if (!(avctx->codec->capabilities & AV_CODEC_CAP_DR1))
>> +        return avcodec_default_get_buffer2(avctx, frame, flags);
>> +
>> +    switch (avctx->codec_type) {
>> +    case AVMEDIA_TYPE_VIDEO:
>> +        avcodec_align_dimensions2(avctx, &w, &h, linesize_align);
>> +        new = ff_default_get_video_buffer(outlink, w, h);
>> +        break;
>> +    case AVMEDIA_TYPE_AUDIO:
>> +        new = ff_default_get_audio_buffer(outlink, frame->nb_samples);
>> +        break;
>> +    default:
>> +        return -1;
>> +    }
>> +
>> +    av_frame_copy_props(new, frame);
>> +    av_frame_unref(frame);
>> +    av_frame_move_ref(frame, new);
>> +    av_frame_free(&new);
>> +
>> +    frame->opaque = outlink;
> 
> For what purpose?
> 
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