scale

scale.c

static AVFrame* scale_encode_write_frame(AVFrame *frame, int src_w, int src_h,
        int dst_w, int dst_h) {
    int ret = 0;
    AVFrame *scale_frame;
    frame = av_frame_alloc();
    if (!frame) {
        av_log(NULL, AV_LOG_DEBUG, "Cannot get allocate scale frame\n");
        return frame;
    }
    SwsContext *scale_context = NULL;
    scale_context = sws_getContext(src_w, src_h,
            ifmt_ctx->video_codec->pix_fmts,
            dst_w, dst_h,
            ifmt_ctx->video_codec->pix_fmts, SWS_BILINEAR, NULL, NULL, NULL);
    if (!scale_context) {
        av_log(NULL, AV_LOG_DEBUG, "Cannot get scaling context\n");
        av_frame_free(&scale_frame);
        return frame;
    }
    
    ret = sws_scale(scale_context, (const uint8_t * const*) frame->data,
            (const int) frame->linesize, 0, src_h,
            scale_frame->data, frame->linesize);
    sws_freeContext(scale_context);
    if (ret < 0) {
        av_frame_free(&scale_frame);
        return frame;
    } else {
        av_frame_free(&frame);
        return scale_frame;
    }
}