Function avifDecoderIsKeyframe

src/read.c:7153–7171

}

avifBool avifDecoderIsKeyframe(const avifDecoder * decoder, uint32_t frameIndex)
{
    if (!decoder->data || (decoder->data->tiles.count == 0)) {
        // Nothing has been parsed yet
        return AVIF_FALSE;
    }

    // *All* tiles for the requested frameIndex must be keyframes in order for
    //  avifDecoderIsKeyframe() to return true, otherwise we may seek to a frame in which the color
    //  planes are a keyframe but the alpha plane isn't a keyframe, which will cause an alpha plane
    //  decode failure.
    for (unsigned int i = 0; i < decoder->data->tiles.count; ++i) {
        const avifTile * tile = &decoder->data->tiles.tile[i];
        if ((frameIndex >= tile->input->samples.count) || !tile->input->samples.sample[frameIndex].sync) {
            return AVIF_FALSE;
        }
    }
    return AVIF_TRUE;
}

uint32_t avifDecoderNearestKeyframe(const avifDecoder * decoder, uint32_t frameIndex)
{