#pragma once

extern "C" {
#include <libavcodec/avcodec.h>
}

namespace engine {

/**
 * @brief Selection Priority:
 *  1. Exact match with sourceRate
 *  2. Lowest supported rate that is >= sourceRate (upsample as little as possible)
 *  3. Highest supported rate overall
 *      rates are below sourceRate, eg a low rate phone codec at 8khz
 */
inline int pickSampleRate(const AVCodec *encoder, int sourceRate)
{
    if (!encoder->supported_samplerates)
        return sourceRate;

    // 1: exact match
    for (const int *r = encoder->supported_samplerates; *r != 0; ++r)
        if (*r == sourceRate)
            return sourceRate;

    // 2: lowest rate >= sourceRate (minimal upsampling)
    int best = 0;
    for (const int *r = encoder->supported_samplerates; *r != 0; ++r) {
        if (*r >= sourceRate) {
            if (best == 0 || *r < best)
                best = *r;
        }
    }
    if (best != 0)
        return best;

    // 3: all supported rates are below sourceRate
    for (const int *r = encoder->supported_samplerates; *r != 0; ++r)
        if (*r > best)
            best = *r;

    return best;
}

} // namespace engine