Function ff_get_buffer

libavcodec/decode.c:1747–1825

}

int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
{
    const FFHWAccel *hwaccel = ffhwaccel(avctx->hwaccel);
    int override_dimensions = 1;
    int ret;

    av_assert0(ff_codec_is_decoder(avctx->codec));

    if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
        if ((unsigned)avctx->width > INT_MAX - STRIDE_ALIGN ||
            (ret = av_image_check_size2(FFALIGN(avctx->width, STRIDE_ALIGN), avctx->height, avctx->max_pixels, AV_PIX_FMT_NONE, 0, avctx)) < 0 || avctx->pix_fmt<0) {
            av_log(avctx, AV_LOG_ERROR, "video_get_buffer: image parameters invalid\n");
            ret = AVERROR(EINVAL);
            goto fail;
        }

        if (frame->width <= 0 || frame->height <= 0) {
            frame->width  = FFMAX(avctx->width,  AV_CEIL_RSHIFT(avctx->coded_width,  avctx->lowres));
            frame->height = FFMAX(avctx->height, AV_CEIL_RSHIFT(avctx->coded_height, avctx->lowres));
            override_dimensions = 0;
        }

        if (frame->data[0] || frame->data[1] || frame->data[2] || frame->data[3]) {
            av_log(avctx, AV_LOG_ERROR, "pic->data[*]!=NULL in get_buffer_internal\n");
            ret = AVERROR(EINVAL);
            goto fail;
        }
    } else if (avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
        if (frame->nb_samples * (int64_t)avctx->ch_layout.nb_channels > avctx->max_samples) {
            av_log(avctx, AV_LOG_ERROR, "samples per frame %d, exceeds max_samples %"PRId64"\n", frame->nb_samples, avctx->max_samples);
            ret = AVERROR(EINVAL);
            goto fail;
        }
    }
    ret = ff_decode_frame_props(avctx, frame);
    if (ret < 0)
        goto fail;

    if (hwaccel) {
        if (hwaccel->alloc_frame) {
            ret = hwaccel->alloc_frame(avctx, frame);
            goto end;
        }
    } else {
        avctx->sw_pix_fmt = avctx->pix_fmt;
        ret = update_frame_props(avctx, frame);
        if (ret < 0)
            goto fail;
    }

    ret = avctx->get_buffer2(avctx, frame, flags);
    if (ret < 0)
        goto fail;

    validate_avframe_allocation(avctx, frame);

    ret = ff_attach_decode_data(frame);
    if (ret < 0)