[FFmpeg-devel] [PATCH] avformat/avcodec: Add DTS-UHD demuxer and parser, movenc support.

[Roy Funderburk]

On 6/13/23 11:35 AM, Paul B Mahol wrote:
> Doing allocation in probe?
> Probing should be very fast.

In line 143 of the avformat patch, memory allocation is removed from the probe

>>+int dtsuhd_frame(DTSUHD *h, const uint8_t *data, size_t data_bytes,
>>+                DTSUHDFrameInfo *fi, DTSUHDDescriptorInfo *di)
>>+{
>>+    gb = &h->gb;
>>+    init_get_bits(gb, data, data_bytes * 8);
> init_get_bits8, and check return code.

In line 986 of the avcodec patch, changed to using init_get_bits8 and added return code check.

>>+        fi->sync = h->is_sync_frame;
>>+        fi->frame_bytes = h->frame_bytes;
>>+        fi->sample_rate = h->sample_rate;
>>+        fi->sample_count = (h->frame_duration * fi->sample_rate) /(h->clock_rate * fraction);
>>+        fi->duration = (double)fi->sample_count / fi->sample_rate;
>Please  no double  type.
>Also make use of av_rescale.

Around line 1108 of the avcodec patch, I found the duration was not needed and removed it.


On 6/13/23 12:04 PM, Anton Khirnov wrote:
> Also do note that sharing structs across libraries opens you to various
> compatibility questions [2]. It might be easier to sidestep them by
> having a function in libavcodec that accepts AVCodecParameters and fills
> them according to the data, rather than pass codec-specific structs
> between libavformat and libavcodec.

In line 1061 of the avcodec patch, changed the function to: 
  int av_dtsuhd_frame(DTSUHD *h, const uint8_t *data, size_t data_bytes,
	AVCodecParameters *codecpar, uint8_t **udts, int *udts_size)



Thank you for reviewing this,
-Roy
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