Function av_hwframe_ctx_alloc

libavutil/hwcontext.c:263–307

}

AVBufferRef *av_hwframe_ctx_alloc(AVBufferRef *device_ref_in)
{
    FFHWDeviceContext *device_ctx = (FFHWDeviceContext*)device_ref_in->data;
    const HWContextType  *hw_type = device_ctx->hw_type;
    FFHWFramesContext *ctxi;
    AVHWFramesContext *ctx;
    AVBufferRef *buf, *device_ref = NULL;

    ctxi = av_mallocz(sizeof(*ctxi));
    if (!ctxi)
        return NULL;
    ctx  = &ctxi->p;

    if (hw_type->frames_hwctx_size) {
        ctx->hwctx = av_mallocz(hw_type->frames_hwctx_size);
        if (!ctx->hwctx)
            goto fail;
    }

    device_ref = av_buffer_ref(device_ref_in);
    if (!device_ref)
        goto fail;

    buf = av_buffer_create((uint8_t*)ctx, sizeof(*ctx),
                           hwframe_ctx_free, NULL,
                           AV_BUFFER_FLAG_READONLY);
    if (!buf)
        goto fail;

    ctx->av_class   = &hwframe_ctx_class;
    ctx->device_ref = device_ref;
    ctx->device_ctx = &device_ctx->p;
    ctx->format     = AV_PIX_FMT_NONE;
    ctx->sw_format  = AV_PIX_FMT_NONE;

    ctxi->hw_type = hw_type;

    return buf;

fail:
    av_buffer_unref(&device_ref);
    av_freep(&ctx->hwctx);
    av_freep(&ctx);
    return NULL;
}

static int hwframe_pool_prealloc(AVBufferRef *ref)
{