Function hb_ff_set_sample_fmt

libhb/hbffmpeg.c:750–793

* Set sample format to the request format if supported by the codec. * The planar/packed variant of the requested format is the next best thing. */

 * The planar/packed variant of the requested format is the next best thing.
 */
void hb_ff_set_sample_fmt(AVCodecContext *context, const AVCodec *codec,
                          enum AVSampleFormat request_sample_fmt)
{
    if (context != NULL && codec != NULL && codec->type == AVMEDIA_TYPE_AUDIO)
    {
        const enum AVSampleFormat *sample_fmts = NULL;
        if (avcodec_get_supported_config(context, NULL,
                                         AV_CODEC_CONFIG_SAMPLE_FORMAT,
                                         0, (const void **)&sample_fmts, NULL) == 0 && sample_fmts != NULL)
        {
            const enum AVSampleFormat *fmt;
            enum AVSampleFormat next_best_fmt;

            next_best_fmt = (av_sample_fmt_is_planar(request_sample_fmt)  ?
                             av_get_packed_sample_fmt(request_sample_fmt) :
                             av_get_planar_sample_fmt(request_sample_fmt));

            context->request_sample_fmt = AV_SAMPLE_FMT_NONE;

            for (fmt = sample_fmts; *fmt != AV_SAMPLE_FMT_NONE; fmt++)
            {
                if (*fmt == request_sample_fmt)
                {
                    context->request_sample_fmt = request_sample_fmt;
                    break;
                }
                else if (*fmt == next_best_fmt)
                {
                    context->request_sample_fmt = next_best_fmt;
                }
            }

            /*
             * When encoding and AVCodec.sample_fmts exists, avcodec_open2()
             * will error out if AVCodecContext.sample_fmt isn't set.
             */
            if (context->request_sample_fmt == AV_SAMPLE_FMT_NONE)
            {
                context->request_sample_fmt = sample_fmts[0];
            }
            context->sample_fmt = context->request_sample_fmt;
        }
    }
}

int hb_av_can_use_zscale(enum AVPixelFormat pix_fmt,
                         int in_width, int in_height,