/*!
* \param *media: A pointer to a MediaFile_t structure, containing every informations available about the current media file.
* \param tid: Track ID.
* \return A pointer to the newlee allocated DecodingContext.
*
* Initialize the DecodingContext and it's bitstream (with a MediaFile_t passed in parameters),
* then NAL Unit structure, then init all pointer's (sps, pps, sei) to NULL.
*/
DecodingContext_t *initDecodingContext(MediaFile_t *media, unsigned tid)
{
TRACE_INFO(H264, BLD_GREEN "initDecodingContext()" CLR_RESET);
DecodingContext_t *dc = NULL;
if (media != NULL &&
tid < media->tracks_video_count &&
media->tracks_video[tid] != NULL)
{
// DecodingContext allocation
dc = (DecodingContext_t*)calloc(1, sizeof(DecodingContext_t));
if (dc == NULL)
{
TRACE_ERROR(H264, "Unable to alloc new DecodingContext!");
}
else
{
// Select media and track
dc->MediaFile = media;
dc->VideoStream = media->tracks_video[tid];
dc->active_tid = tid;
// Init some quantization parameters
computeNormAdjust(dc);
// Init input bitstream
dc->bitstr = init_bitstream(media, media->tracks_video[tid]);
if (dc->bitstr == NULL)
{
free(dc);
dc = NULL;
}
else
{
// Init NAL Unit
dc->active_nalu = initNALU();
if (dc->active_nalu == NULL)
{
free(dc->bitstr);
dc->bitstr = NULL;
free(dc);
dc = NULL;
}
}
}
}
// Return the DecodingContext
return dc;
}
/*!
* \brief Free decoding context.
* \param *video A pointer to a VideoFile_t structure, containing every informations available about the current video file.
* \return A pointer to the newlee allocated DecodingContext.
*
* Initialize the DecodingContext and it's bitstream (with a VideoFile_t passed in parameters),
* then NAL Unit structure, then init all pointer's (sps, pps, sei) to NULL.
*/
DecodingContext_t *initDecodingContext(VideoFile_t *video)
{
TRACE_INFO(H264, BLD_GREEN "initDecodingContext()\n" CLR_RESET);
DecodingContext_t *dc = NULL;
if (video != NULL)
{
// DecodingContext allocation
dc = (DecodingContext_t*)calloc(1, sizeof(DecodingContext_t));
if (dc == NULL)
{
TRACE_ERROR(H264, "Unable to alloc new DecodingContext!\n");
}
else
{
// Init output variables
dc->output_format = 0;
dc->picture_quality = 75;
dc->picture_number = 1;
dc->picture_extractionmode = 0;
// Init input bitstream
dc->VideoFile = video;
dc->bitstr = init_bitstream(video, video->tracks_video[0]);
if (dc->bitstr == NULL)
{
free(dc);
dc = NULL;
}
else
{
// Init NAL Unit
dc->active_nalu = initNALU();
if (dc->active_nalu == NULL)
{
free(dc->bitstr);
dc->bitstr = NULL;
free(dc);
dc = NULL;
}
else
{
// Cleanup array of SPS and PPS
int i = 0;
for (i = 0; i < MAX_SPS; i++)
{
dc->sps_array[i] = NULL;
}
for (i = 0; i < MAX_PPS; i++)
{
dc->pps_array[i] = NULL;
}
dc->active_sei = NULL;
dc->active_slice = NULL;
dc->mb_array = NULL;
TRACE_1(H264, "* DecodingContext allocation success\n");
}
}
}
}
// Return the DecodingContext
return dc;
}
