[FFmpeg-devel] [PATCH] fftools/ffmpeg_opt: Don't duplicate array unnecessarily

[Andreas Rheinhardt]

Andreas Rheinhardt:
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>
> ---
>  fftools/ffmpeg.c     |  3 ---
>  fftools/ffmpeg.h     |  7 ++++---
>  fftools/ffmpeg_opt.c | 43 ++++++++-----------------------------------
>  3 files changed, 12 insertions(+), 41 deletions(-)
> 
> diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
> index c838e2604c..0bc11949f2 100644
> --- a/fftools/ffmpeg.c
> +++ b/fftools/ffmpeg.c
> @@ -555,9 +555,6 @@ static void ffmpeg_cleanup(int ret)
>  
>              avfilter_inout_free(&ofilter->out_tmp);
>              av_freep(&ofilter->name);
> -            av_freep(&ofilter->formats);
> -            av_freep(&ofilter->channel_layouts);
> -            av_freep(&ofilter->sample_rates);
>              av_freep(&fg->outputs[j]);
>          }
>          av_freep(&fg->outputs);
> diff --git a/fftools/ffmpeg.h b/fftools/ffmpeg.h
> index 1728010f56..f10b63c21f 100644
> --- a/fftools/ffmpeg.h
> +++ b/fftools/ffmpeg.h
> @@ -281,9 +281,10 @@ typedef struct OutputFilter {
>      uint64_t channel_layout;
>  
>      // those are only set if no format is specified and the encoder gives us multiple options
> -    int *formats;
> -    uint64_t *channel_layouts;
> -    int *sample_rates;
> +    // They point directly to the relevant lists of the encoder.
> +    const int *formats;
> +    const uint64_t *channel_layouts;
> +    const int *sample_rates;
>  } OutputFilter;
>  
>  typedef struct FilterGraph {
> diff --git a/fftools/ffmpeg_opt.c b/fftools/ffmpeg_opt.c
> index feed772452..8a0cad3f62 100644
> --- a/fftools/ffmpeg_opt.c
> +++ b/fftools/ffmpeg_opt.c
> @@ -2631,7 +2631,6 @@ loop_end:
>          /* set the filter output constraints */
>          if (ost->filter) {
>              OutputFilter *f = ost->filter;
> -            int count;
>              switch (ost->enc_ctx->codec_type) {
>              case AVMEDIA_TYPE_VIDEO:
>                  f->frame_rate = ost->frame_rate;
> @@ -2639,51 +2638,25 @@ loop_end:
>                  f->height     = ost->enc_ctx->height;
>                  if (ost->enc_ctx->pix_fmt != AV_PIX_FMT_NONE) {
>                      f->format = ost->enc_ctx->pix_fmt;
> -                } else if (ost->enc->pix_fmts) {
> -                    count = 0;
> -                    while (ost->enc->pix_fmts[count] != AV_PIX_FMT_NONE)
> -                        count++;
> -                    f->formats = av_calloc(count + 1, sizeof(*f->formats));
> -                    if (!f->formats)
> -                        exit_program(1);
> -                    memcpy(f->formats, ost->enc->pix_fmts, (count + 1) * sizeof(*f->formats));
> +                } else {
> +                    f->formats = ost->enc->pix_fmts;
>                  }
>                  break;
>              case AVMEDIA_TYPE_AUDIO:
>                  if (ost->enc_ctx->sample_fmt != AV_SAMPLE_FMT_NONE) {
>                      f->format = ost->enc_ctx->sample_fmt;
> -                } else if (ost->enc->sample_fmts) {
> -                    count = 0;
> -                    while (ost->enc->sample_fmts[count] != AV_SAMPLE_FMT_NONE)
> -                        count++;
> -                    f->formats = av_calloc(count + 1, sizeof(*f->formats));
> -                    if (!f->formats)
> -                        exit_program(1);
> -                    memcpy(f->formats, ost->enc->sample_fmts, (count + 1) * sizeof(*f->formats));
> +                } else {
> +                    f->formats = ost->enc->sample_fmts;
>                  }
>                  if (ost->enc_ctx->sample_rate) {
>                      f->sample_rate = ost->enc_ctx->sample_rate;
> -                } else if (ost->enc->supported_samplerates) {
> -                    count = 0;
> -                    while (ost->enc->supported_samplerates[count])
> -                        count++;
> -                    f->sample_rates = av_calloc(count + 1, sizeof(*f->sample_rates));
> -                    if (!f->sample_rates)
> -                        exit_program(1);
> -                    memcpy(f->sample_rates, ost->enc->supported_samplerates,
> -                           (count + 1) * sizeof(*f->sample_rates));
> +                } else {
> +                    f->sample_rates = ost->enc->supported_samplerates;
>                  }
>                  if (ost->enc_ctx->channels) {
>                      f->channel_layout = av_get_default_channel_layout(ost->enc_ctx->channels);
> -                } else if (ost->enc->channel_layouts) {
> -                    count = 0;
> -                    while (ost->enc->channel_layouts[count])
> -                        count++;
> -                    f->channel_layouts = av_calloc(count + 1, sizeof(*f->channel_layouts));
> -                    if (!f->channel_layouts)
> -                        exit_program(1);
> -                    memcpy(f->channel_layouts, ost->enc->channel_layouts,
> -                           (count + 1) * sizeof(*f->channel_layouts));
> +                } else {
> +                    f->channel_layouts = ost->enc->channel_layouts;
>                  }
>                  break;
>              }
> 

Will apply tonight unless there are objections.

- Andreas