Function swr_init

libswresample/swresample.c:156–406

}

av_cold int swr_init(struct SwrContext *s){
    int ret;
    char l1[1024], l2[1024];

    clear_context(s);

    if((unsigned) s-> in_sample_fmt >= AV_SAMPLE_FMT_NB){
        av_log(s, AV_LOG_ERROR, "Requested input sample format %d is invalid\n", s->in_sample_fmt);
        return AVERROR(EINVAL);
    }
    if((unsigned) s->out_sample_fmt >= AV_SAMPLE_FMT_NB){
        av_log(s, AV_LOG_ERROR, "Requested output sample format %d is invalid\n", s->out_sample_fmt);
        return AVERROR(EINVAL);
    }

    if(s-> in_sample_rate <= 0){
        av_log(s, AV_LOG_ERROR, "Requested input sample rate %d is invalid\n", s->in_sample_rate);
        return AVERROR(EINVAL);
    }
    if(s->out_sample_rate <= 0){
        av_log(s, AV_LOG_ERROR, "Requested output sample rate %d is invalid\n", s->out_sample_rate);
        return AVERROR(EINVAL);
    }

    s->out.ch_count  = s-> user_out_chlayout.nb_channels;
    s-> in.ch_count  = s->  user_in_chlayout.nb_channels;

    if (swri_check_chlayout(s, &s->user_in_chlayout , "input") ||
        swri_check_chlayout(s, &s->user_out_chlayout, "output"))
        return AVERROR(EINVAL);

    ret  = av_channel_layout_copy(&s->in_ch_layout, &s->user_in_chlayout);
    ret |= av_channel_layout_copy(&s->out_ch_layout, &s->user_out_chlayout);
    ret |= av_channel_layout_copy(&s->used_ch_layout, &s->user_used_chlayout);
    if (ret < 0)
        return ret;

    s->int_sample_fmt= s->user_int_sample_fmt;

    s->dither.method = s->user_dither_method;

    switch(s->engine){
#if CONFIG_LIBSOXR
        case SWR_ENGINE_SOXR: s->resampler = &swri_soxr_resampler; break;
#endif
        case SWR_ENGINE_SWR : s->resampler = &swri_resampler; break;
        default:
            av_log(s, AV_LOG_ERROR, "Requested resampling engine is unavailable\n");
            return AVERROR(EINVAL);
    }

    if (!av_channel_layout_check(&s->used_ch_layout))
        av_channel_layout_default(&s->used_ch_layout, s->in.ch_count);

    if (s->used_ch_layout.nb_channels != s->in_ch_layout.nb_channels)
        av_channel_layout_uninit(&s->in_ch_layout);

    if (s->used_ch_layout.order == AV_CHANNEL_ORDER_UNSPEC)