Function av_hwframe_get_buffer

libavutil/hwcontext.c:506–568

}

int av_hwframe_get_buffer(AVBufferRef *hwframe_ref, AVFrame *frame, int flags)
{
    FFHWFramesContext *ctxi = (FFHWFramesContext*)hwframe_ref->data;
    AVHWFramesContext *ctx  = &ctxi->p;
    int ret;

    if (ctxi->source_frames) {
        // This is a derived frame context, so we allocate in the source
        // and map the frame immediately.
        AVFrame *src_frame;

        frame->format = ctx->format;
        frame->hw_frames_ctx = av_buffer_ref(hwframe_ref);
        if (!frame->hw_frames_ctx)
            return AVERROR(ENOMEM);

        src_frame = av_frame_alloc();
        if (!src_frame)
            return AVERROR(ENOMEM);

        ret = av_hwframe_get_buffer(ctxi->source_frames,
                                    src_frame, 0);
        if (ret < 0) {
            av_frame_free(&src_frame);
            return ret;
        }

        ret = av_hwframe_map(frame, src_frame,
                             ctxi->source_allocation_map_flags);
        if (ret) {
            av_log(ctx, AV_LOG_ERROR, "Failed to map frame into derived "
                   "frame context: %d.\n", ret);
            av_frame_free(&src_frame);
            return ret;
        }

        // Free the source frame immediately - the mapped frame still
        // contains a reference to it.
        av_frame_free(&src_frame);

        return 0;
    }

    if (!ctxi->hw_type->frames_get_buffer)
        return AVERROR(ENOSYS);

    if (!ctx->pool)
        return AVERROR(EINVAL);

    frame->hw_frames_ctx = av_buffer_ref(hwframe_ref);
    if (!frame->hw_frames_ctx)
        return AVERROR(ENOMEM);

    ret = ctxi->hw_type->frames_get_buffer(ctx, frame);
    if (ret < 0) {
        av_buffer_unref(&frame->hw_frames_ctx);
        return ret;
    }