int libavsmash_video_initialize_decoder_configuration
(
libavsmash_video_decode_handler_t *vdhp,
AVFormatContext *format_ctx,
int threads
)
{
char error_string[128] = { 0 };
if( libavsmash_video_get_summaries( vdhp ) < 0 )
return -1;
/* libavformat */
uint32_t type = AVMEDIA_TYPE_VIDEO;
uint32_t i;
for( i = 0; i < format_ctx->nb_streams && format_ctx->streams[i]->codecpar->codec_type != type; i++ );
if( i == format_ctx->nb_streams )
{
strcpy( error_string, "Failed to find stream by libavformat.\n" );
goto fail;
}
/* libavcodec */
AVCodecParameters *codecpar = format_ctx->streams[i]->codecpar;
if( libavsmash_find_and_open_decoder( &vdhp->config, codecpar, threads, 1 ) < 0 )
{
strcpy( error_string, "Failed to find and open the video decoder.\n" );
goto fail;
}
return initialize_decoder_configuration( vdhp->root, vdhp->track_id, &vdhp->config );
fail:;
lw_log_handler_t *lhp = libavsmash_video_get_log_handler( vdhp );
lw_log_show( lhp, LW_LOG_FATAL, "%s", error_string );
return -1;
}
static const VSFrameRef *VS_CC vs_filter_get_frame( int n, int activation_reason, void **instance_data, void **frame_data, VSFrameContext *frame_ctx, VSCore *core, const VSAPI *vsapi )
{
if( activation_reason != arInitial )
return NULL;
lsmas_handler_t *hp = (lsmas_handler_t *)*instance_data;
VSVideoInfo *vi = &hp->vi;
uint32_t sample_number = MIN( n + 1, vi->numFrames ); /* For L-SMASH, sample_number is 1-origin. */
libavsmash_video_decode_handler_t *vdhp = hp->vdhp;
libavsmash_video_output_handler_t *vohp = hp->vohp;
if( libavsmash_video_get_error( vdhp ) )
{
vsapi->setFilterError( "lsmas: failed to output a video frame.", frame_ctx );
return NULL;
}
/* Set up VapourSynth error handler. */
vs_basic_handler_t vsbh = { 0 };
vsbh.out = NULL;
vsbh.frame_ctx = frame_ctx;
vsbh.vsapi = vsapi;
lw_log_handler_t *lhp = libavsmash_video_get_log_handler( vdhp );
lhp->priv = &vsbh;
lhp->show_log = set_error;
/* Get and decode the desired video frame. */
vs_video_output_handler_t *vs_vohp = (vs_video_output_handler_t *)vohp->private_handler;
vs_vohp->frame_ctx = frame_ctx;
vs_vohp->core = core;
vs_vohp->vsapi = vsapi;
if( libavsmash_video_get_frame( vdhp, vohp, sample_number ) < 0 )
{
vsapi->setFilterError( "lsmas: failed to output a video frame.", frame_ctx );
return NULL;
}
/* Output video frame. */
AVFrame *av_frame = libavsmash_video_get_frame_buffer( vdhp );
VSFrameRef *vs_frame = make_frame( vohp, av_frame );
if( !vs_frame )
{
vsapi->setFilterError( "lsmas: failed to output a video frame.", frame_ctx );
return NULL;
}
set_frame_properties( vdhp, vi, av_frame, vs_frame, sample_number, vsapi );
return vs_frame;
}
/*****************************************************************************
* Others
*****************************************************************************/
int libavsmash_video_get_track
(
libavsmash_video_decode_handler_t *vdhp,
uint32_t track_number
)
{
lw_log_handler_t *lhp = libavsmash_video_get_log_handler( vdhp );
uint32_t track_id =
libavsmash_get_track_by_media_type
(
libavsmash_video_get_root( vdhp ),
ISOM_MEDIA_HANDLER_TYPE_VIDEO_TRACK,
track_number,
lhp
);
if( track_id == 0 )
return -1;
libavsmash_video_set_track_id( vdhp, track_id );
(void)libavsmash_video_fetch_sample_count ( vdhp );
(void)libavsmash_video_fetch_media_duration ( vdhp );
(void)libavsmash_video_fetch_media_timescale( vdhp );
return 0;
}