Re: [FFmpeg-devel] [PATCH] libavcodec/qsvenc: Flush cached frames before reset encoder

[Andreas Rheinhardt <andreas.rheinhardt@outlook.com>]

wenbin.chen-at-intel.com@ffmpeg.org:
> From: Wenbin Chen <wenbin.chen@intel.com>
> 
> According to https://github.com/Intel-Media-SDK/MediaSDK/blob/master/doc/mediasdk-man.md#configuration-change.
> Before calling MFXVideoENCODE_Reset, The application needs to retrieve
> any cached frames in the SDK encoder.
> A loop is added before MFXVideoENCODE_Reset to retrieve cached frames
> and add them to async_fifo, so that dynamic configuration works when
> async_depth > 1.
> 
> Signed-off-by: Wenbin Chen <wenbin.chen@intel.com>
> ---
>  libavcodec/qsvenc.c | 118 +++++++++++++++++++++++---------------------
>  1 file changed, 63 insertions(+), 55 deletions(-)
> 
> diff --git a/libavcodec/qsvenc.c b/libavcodec/qsvenc.c
> index 2f0e94a914..f3b488dec8 100644
> --- a/libavcodec/qsvenc.c
> +++ b/libavcodec/qsvenc.c
> @@ -1600,7 +1600,7 @@ int ff_qsv_enc_init(AVCodecContext *avctx, QSVEncContext *q)
>  
>      q->param.AsyncDepth = q->async_depth;
>  
> -    q->async_fifo = av_fifo_alloc2(q->async_depth, sizeof(QSVPacket), 0);
> +    q->async_fifo = av_fifo_alloc2(q->async_depth, sizeof(QSVPacket), AV_FIFO_FLAG_AUTO_GROW);

If you use AV_FIFO_FLAG_AUTO_GROW, you need to handle av_fifo_write()
errors.

>      if (!q->async_fifo)
>          return AVERROR(ENOMEM);
>  
> @@ -2296,58 +2296,6 @@ static int update_pic_timing_sei(AVCodecContext *avctx, QSVEncContext *q)
>      return updated;
>  }
>  
> -static int update_parameters(AVCodecContext *avctx, QSVEncContext *q,
> -                             const AVFrame *frame)
> -{
> -    int needReset = 0, ret = 0;
> -
> -    if (!frame || avctx->codec_id == AV_CODEC_ID_MJPEG)
> -        return 0;
> -
> -    needReset = update_qp(avctx, q);
> -    needReset |= update_max_frame_size(avctx, q);
> -    needReset |= update_gop_size(avctx, q);
> -    needReset |= update_rir(avctx, q);
> -    needReset |= update_low_delay_brc(avctx, q);
> -    needReset |= update_frame_rate(avctx, q);
> -    needReset |= update_bitrate(avctx, q);
> -    needReset |= update_pic_timing_sei(avctx, q);
> -    ret = update_min_max_qp(avctx, q);
> -    if (ret < 0)
> -        return ret;
> -    needReset |= ret;
> -    if (!needReset)
> -        return 0;
> -
> -    if (avctx->hwaccel_context) {
> -        AVQSVContext *qsv = avctx->hwaccel_context;
> -        int i, j;
> -        q->param.ExtParam = q->extparam;
> -        for (i = 0; i < qsv->nb_ext_buffers; i++)
> -            q->param.ExtParam[i] = qsv->ext_buffers[i];
> -        q->param.NumExtParam = qsv->nb_ext_buffers;
> -
> -        for (i = 0; i < q->nb_extparam_internal; i++) {
> -            for (j = 0; j < qsv->nb_ext_buffers; j++) {
> -                if (qsv->ext_buffers[j]->BufferId == q->extparam_internal[i]->BufferId)
> -                    break;
> -            }
> -            if (j < qsv->nb_ext_buffers)
> -                continue;
> -            q->param.ExtParam[q->param.NumExtParam++] = q->extparam_internal[i];
> -        }
> -    } else {
> -        q->param.ExtParam    = q->extparam_internal;
> -        q->param.NumExtParam = q->nb_extparam_internal;
> -    }
> -    av_log(avctx, AV_LOG_DEBUG, "Parameter change, call msdk reset.\n");
> -    ret = MFXVideoENCODE_Reset(q->session, &q->param);
> -    if (ret < 0)
> -        return ff_qsv_print_error(avctx, ret, "Error during resetting");
> -
> -    return 0;
> -}
> -
>  static int encode_frame(AVCodecContext *avctx, QSVEncContext *q,
>                          const AVFrame *frame)
>  {
> @@ -2438,7 +2386,7 @@ static int encode_frame(AVCodecContext *avctx, QSVEncContext *q,
>  
>      if (ret < 0) {
>          ret = (ret == MFX_ERR_MORE_DATA) ?
> -               0 : ff_qsv_print_error(avctx, ret, "Error during encoding");
> +               AVERROR(EAGAIN) : ff_qsv_print_error(avctx, ret, "Error during encoding");
>          goto free;
>      }
>  
> @@ -2466,6 +2414,66 @@ nomem:
>      goto free;
>  }
>  
> +static int update_parameters(AVCodecContext *avctx, QSVEncContext *q,
> +                             const AVFrame *frame)
> +{
> +    int needReset = 0, ret = 0;
> +
> +    if (!frame || avctx->codec_id == AV_CODEC_ID_MJPEG)
> +        return 0;
> +
> +    needReset = update_qp(avctx, q);
> +    needReset |= update_max_frame_size(avctx, q);
> +    needReset |= update_gop_size(avctx, q);
> +    needReset |= update_rir(avctx, q);
> +    needReset |= update_low_delay_brc(avctx, q);
> +    needReset |= update_frame_rate(avctx, q);
> +    needReset |= update_bitrate(avctx, q);
> +    needReset |= update_pic_timing_sei(avctx, q);
> +    ret = update_min_max_qp(avctx, q);
> +    if (ret < 0)
> +        return ret;
> +    needReset |= ret;
> +    if (!needReset)
> +        return 0;
> +
> +    if (avctx->hwaccel_context) {
> +        AVQSVContext *qsv = avctx->hwaccel_context;
> +        int i, j;
> +        q->param.ExtParam = q->extparam;
> +        for (i = 0; i < qsv->nb_ext_buffers; i++)
> +            q->param.ExtParam[i] = qsv->ext_buffers[i];
> +        q->param.NumExtParam = qsv->nb_ext_buffers;
> +
> +        for (i = 0; i < q->nb_extparam_internal; i++) {
> +            for (j = 0; j < qsv->nb_ext_buffers; j++) {
> +                if (qsv->ext_buffers[j]->BufferId == q->extparam_internal[i]->BufferId)
> +                    break;
> +            }
> +            if (j < qsv->nb_ext_buffers)
> +                continue;
> +            q->param.ExtParam[q->param.NumExtParam++] = q->extparam_internal[i];
> +        }
> +    } else {
> +        q->param.ExtParam    = q->extparam_internal;
> +        q->param.NumExtParam = q->nb_extparam_internal;
> +    }
> +
> +    // Flush codec before reset configuration.
> +    while (ret != AVERROR(EAGAIN)) {
> +        ret = encode_frame(avctx, q, NULL);
> +        if (ret < 0 && ret != AVERROR(EAGAIN))
> +            return ret;
> +    }
> +
> +    av_log(avctx, AV_LOG_DEBUG, "Parameter change, call msdk reset.\n");
> +    ret = MFXVideoENCODE_Reset(q->session, &q->param);
> +    if (ret < 0)
> +        return ff_qsv_print_error(avctx, ret, "Error during resetting");
> +
> +    return 0;
> +}
> +
>  int ff_qsv_encode(AVCodecContext *avctx, QSVEncContext *q,
>                    AVPacket *pkt, const AVFrame *frame, int *got_packet)
>  {
> @@ -2476,7 +2484,7 @@ int ff_qsv_encode(AVCodecContext *avctx, QSVEncContext *q,
>          return ret;
>  
>      ret = encode_frame(avctx, q, frame);
> -    if (ret < 0)
> +    if (ret < 0 && ret != AVERROR(EAGAIN))
>          return ret;
>  
>      if ((av_fifo_can_read(q->async_fifo) >= q->async_depth) ||

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