static inline int get_frame_length
(
libavsmash_audio_decode_handler_t *adhp,
uint32_t frame_number,
uint32_t *frame_length,
libavsmash_summary_t **sp
)
{
lsmash_sample_t sample;
if( lsmash_get_sample_info_from_media_timeline( adhp->root, adhp->track_ID, frame_number, &sample ) )
return -1;
*sp = &adhp->config.entries[ sample.index - 1 ];
libavsmash_summary_t *s = *sp;
if( s->extended.frame_length == 0 )
{
/* variable frame length
* Guess the frame length from sample duration. */
if( lsmash_get_sample_delta_from_media_timeline( adhp->root, adhp->track_ID, frame_number, frame_length ) )
return -1;
*frame_length *= s->extended.upsampling;
}
else
/* constant frame length */
*frame_length = s->extended.frame_length;
return 0;
}
int libavsmash_video_get_sample_duration
(
libavsmash_video_decode_handler_t *vdhp,
uint32_t coded_sample_number,
uint32_t *sample_duration
)
{
return lsmash_get_sample_delta_from_media_timeline( vdhp->root, vdhp->track_id, coded_sample_number, sample_duration );
}
uint64_t libavsmash_count_overall_pcm_samples
(
libavsmash_audio_decode_handler_t *adhp,
int output_sample_rate,
uint64_t *skip_decoded_samples /* converted to upsampled in this function */
)
{
codec_configuration_t *config = &adhp->config;
extended_summary_t *es = NULL;
/* Here, the decoder upsampling is defined only when libavcodec doesn't return upsampled length as AVCodecContext.frame_size. */
int current_sample_rate = 0; /* after the decoder upsampling */
uint32_t current_index = 0;
uint32_t current_frame_length = 0; /* before the decoder upsampling */
uint64_t sequence_pcm_count = 0; /* before the decoder upsampling */
uint64_t prior_sequences_pcm_count = 0; /* before the decoder upsampling */
uint64_t overall_pcm_count = 0; /* after the decoder and the resampler upsampling */
uint64_t orig_skip_decoded_samples = *skip_decoded_samples; /* before the decoder upsampling */
/* Count the number of output PCM audio samples in each sequence. */
*skip_decoded_samples = 0;
for( uint32_t i = 1; i <= adhp->frame_count; i++ )
{
/* Get configuration index. */
lsmash_sample_t sample;
if( lsmash_get_sample_info_from_media_timeline( adhp->root, adhp->track_ID, i, &sample ) )
continue;
if( current_index != sample.index )
{
es = &config->entries[ sample.index - 1 ].extended;
current_index = sample.index;
}
else if( !es )
continue;
/* Get audio frame length. */
uint32_t frame_length;
if( es->frame_length )
frame_length = es->frame_length;
else if( lsmash_get_sample_delta_from_media_timeline( adhp->root, adhp->track_ID, i, &frame_length ) )
continue;
/* */
if( (current_sample_rate != es->sample_rate && es->sample_rate > 0)
|| current_frame_length != frame_length )
{
/* Encountered a new sequence. */
if( current_sample_rate > 0 )
{
/* Add the number of decoded PCM audio samples which shall be skipped. */
if( orig_skip_decoded_samples > prior_sequences_pcm_count )
{
if( orig_skip_decoded_samples >= prior_sequences_pcm_count + sequence_pcm_count )
/* All decoded PCM audio samples in the previous sequence shall be skipped. */
*skip_decoded_samples += sequence_pcm_count * es->upsampling;
else
/* 0 < orig_skip_decoded_samples - prior_sequences_pcm_count < sequence_pcm_count
* Partial decoded PCM audio samples in the previous sequence are not skipped. */
*skip_decoded_samples += (orig_skip_decoded_samples - prior_sequences_pcm_count) * es->upsampling;
}
prior_sequences_pcm_count += sequence_pcm_count;
/* Add the number of output PCM audio samples in the previous sequence. */
overall_pcm_count += count_sequence_output_pcm_samples( sequence_pcm_count * es->upsampling,
*skip_decoded_samples,
current_sample_rate,
output_sample_rate );
sequence_pcm_count = 0;
}
current_sample_rate = es->sample_rate > 0 ? es->sample_rate : config->ctx->sample_rate;
current_frame_length = frame_length;
}
sequence_pcm_count += frame_length;
}
if( !es || (sequence_pcm_count == 0 && overall_pcm_count == 0) )
return 0;
/* Count the number of output PCM audio samples in the last sequence. */
if( orig_skip_decoded_samples > prior_sequences_pcm_count )
*skip_decoded_samples += (orig_skip_decoded_samples - prior_sequences_pcm_count) * es->upsampling;
current_sample_rate = es->sample_rate > 0 ? es->sample_rate : config->ctx->sample_rate;
overall_pcm_count += count_sequence_output_pcm_samples( sequence_pcm_count * es->upsampling,
*skip_decoded_samples,
current_sample_rate,
output_sample_rate );
/* Return the number of output PCM audio samples. */
return overall_pcm_count;
}
