setup_resampler()

bool MayaFlux::IO::SoundFileReader::setup_resampler ( const std::shared_ptr< FFmpegContext > &  ctx )

private

Set up the FFmpeg resampler if needed.

Returns

True if setup succeeded.

Definition at line 240 of file SoundFileReader.cpp.

{
    if (!ctx || !ctx->codec_context) {
        return false;
    }
 
    AVChannelLayout out_ch_layout;
    av_channel_layout_copy(&out_ch_layout, &ctx->codec_context->ch_layout);
 
    uint32_t out_sample_rate = m_target_sample_rate > 0 ? m_target_sample_rate : ctx->codec_context->sample_rate;
 
    AVSampleFormat out_sample_fmt = (m_audio_options & AudioReadOptions::DEINTERLEAVE) != AudioReadOptions::NONE
        ? AV_SAMPLE_FMT_DBLP
        : AV_SAMPLE_FMT_DBL;
 
    int ret = swr_alloc_set_opts2(&ctx->swr_context,
        &out_ch_layout, out_sample_fmt, out_sample_rate,
        &ctx->codec_context->ch_layout, ctx->codec_context->sample_fmt,
        ctx->codec_context->sample_rate,
        0, nullptr);
 
    av_channel_layout_uninit(&out_ch_layout);
 
    if (ret < 0 || !ctx->swr_context) {
        set_error("Failed to allocate resampler");
        return false;
    }
 
    if (swr_init(ctx->swr_context) < 0) {
        set_error("Failed to initialize resampler");
        return false;
    }
 
    return true;
}

References MayaFlux::IO::DEINTERLEAVE, m_audio_options, m_target_sample_rate, MayaFlux::IO::NONE, and set_error().

Referenced by open().

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