[FFmpeg-devel] [PATCH v15 1/2] lavc/svt_hevc: add libsvt hevc encoder wrapper

[James Almer]

On 7/30/2019 2:59 AM, Limin Wang wrote:
>> +    if (avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {
>> +        EB_BUFFERHEADERTYPE *header_ptr = NULL;
>> +
>> +        svt_ret = EbH265EncStreamHeader(svt_enc->svt_handle, &header_ptr);
>> +        if (svt_ret != EB_ErrorNone) {
>> +            av_log(avctx, AV_LOG_ERROR, "Failed to build stream header\n");
>> +            goto failed_init_encoder;
>> +        }
>> +
>> +        avctx->extradata_size = header_ptr->nFilledLen;
>> +        avctx->extradata = av_malloc(avctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
> It's preferalbe to use av_mallocz

He was asked to do it this way as it's faster. No need to zero the whole
buffer if it's going to be written to immediately afterwards. Only the
trailing padding bytes needs to be zeroed.