static int decode_video_sample
(
libavsmash_video_decode_handler_t *vdhp,
AVFrame *picture,
int *got_picture,
uint32_t sample_number
)
{
codec_configuration_t *config = &vdhp->config;
AVPacket pkt = { 0 };
int ret = get_sample( vdhp->root, vdhp->track_id, sample_number, config, &pkt );
if( ret )
return ret;
if( pkt.flags != ISOM_SAMPLE_RANDOM_ACCESS_FLAG_NONE )
{
pkt.flags = AV_PKT_FLAG_KEY;
vdhp->last_rap_number = sample_number;
}
else
pkt.flags = 0;
av_frame_unref( picture );
uint64_t cts = pkt.pts;
ret = decode_video_packet( config->ctx, picture, got_picture, &pkt );
picture->pts = cts;
if( ret < 0 )
{
lw_log_show( &config->lh, LW_LOG_WARNING, "Failed to decode a video frame." );
return -1;
}
return 0;
}
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 int get_picture
(
libavsmash_video_decode_handler_t *vdhp,
AVFrame *picture,
uint32_t current,
uint32_t goal
)
{
codec_configuration_t *config = &vdhp->config;
int got_picture = (current > goal);
while( current <= goal )
{
int ret = decode_video_sample( vdhp, picture, &got_picture, current );
if( ret == -1 )
return -1;
else if( ret == 1 )
/* Sample doesn't exist. */
break;
++current;
if( config->update_pending )
/* A new decoder configuration is needed. Anyway, stop getting picture. */
break;
if( !got_picture )
{
/* Fundamental seek operations after the decoder initialization is already done, but
* more input samples are required to output and the goal become more distant. */
++ config->delay_count;
++ goal;
}
}
/* Flush the last frames. */
if( current > vdhp->sample_count && get_decoder_delay( config->ctx ) )
while( current <= goal )
{
AVPacket pkt = { 0 };
av_init_packet( &pkt );
pkt.data = NULL;
pkt.size = 0;
av_frame_unref( picture );
if( decode_video_packet( config->ctx, picture, &got_picture, &pkt ) < 0 )
{
lw_log_show( &config->lh, LW_LOG_WARNING, "Failed to decode and flush a video frame." );
return -1;
}
++current;
}
return got_picture ? 0 : -1;
}
int libavsmash_audio_initialize_decoder_configuration
(
libavsmash_audio_decode_handler_t *adhp,
AVFormatContext *format_ctx,
int threads
)
{
char error_string[128] = { 0 };
if( libavsmash_audio_get_summaries( adhp ) < 0 )
return -1;
/* libavformat */
uint32_t type = AVMEDIA_TYPE_AUDIO;
uint32_t i;
for( i = 0; i < format_ctx->nb_streams && format_ctx->streams[i]->codec->codec_type != type; i++ );
if( i == format_ctx->nb_streams )
{
strcpy( error_string, "Failed to find stream by libavformat.\n" );
goto fail;
}
/* libavcodec */
AVCodecContext *ctx = format_ctx->streams[i]->codec;
AVCodec *codec;
libavsmash_audio_set_codec_context( adhp, ctx );
codec = libavsmash_audio_find_decoder( adhp );
if( !codec )
{
sprintf( error_string, "Failed to find %s decoder.\n", codec->name );
goto fail;
}
ctx->thread_count = threads;
if( avcodec_open2( ctx, codec, NULL ) < 0 )
{
strcpy( error_string, "Failed to avcodec_open2.\n" );
goto fail;
}
return initialize_decoder_configuration( adhp->root, adhp->track_id, &adhp->config );
fail:;
lw_log_handler_t *lhp = libavsmash_audio_get_log_handler( adhp );
lw_log_show( lhp, LW_LOG_FATAL, "%s", error_string );
return -1;
}
void lwlibav_flush_buffers
(
lwlibav_decode_handler_t *dhp
)
{
/* Close and reopen the decoder even if the decoder implements avcodec_flush_buffers().
* It seems this brings about more stable composition when seeking. */
AVCodecContext *ctx = dhp->format->streams[ dhp->stream_index ]->codec;
const AVCodec *codec = ctx->codec;
avcodec_close( ctx );
ctx->codec_id = AV_CODEC_ID_NONE; /* AVCodecContext.codec_id is supposed to be set properly in avcodec_open2().
* This avoids avcodec_open2() failure by the difference of enum AVCodecID.
* For instance, when stream is encoded as AC-3,
* AVCodecContext.codec_id might have been set to AV_CODEC_ID_EAC3
* while AVCodec.id is set to AV_CODEC_ID_AC3. */
if( open_decoder( ctx, codec ) < 0 )
{
dhp->error = 1;
lw_log_show( &dhp->lh, LW_LOG_FATAL,
"Failed to flush buffers.\n"
"It is recommended you reopen the file." );
}
dhp->exh.delay_count = 0;
}
static int get_requested_picture
(
libavsmash_video_decode_handler_t *vdhp,
AVFrame *picture,
uint32_t sample_number
)
{
#define MAX_ERROR_COUNT 3 /* arbitrary */
codec_configuration_t *config = &vdhp->config;
uint32_t config_index;
if( sample_number < vdhp->first_valid_frame_number || vdhp->sample_count == 1 )
{
/* Get the index of the decoder configuration. */
lsmash_sample_t sample;
uint32_t decoding_sample_number = get_decoding_sample_number( vdhp->order_converter, vdhp->first_valid_frame_number );
if( lsmash_get_sample_info_from_media_timeline( vdhp->root, vdhp->track_id, decoding_sample_number, &sample ) < 0 )
goto video_fail;
config_index = sample.index;
/* Copy the first valid video frame data. */
av_frame_unref( picture );
if( av_frame_ref( picture, vdhp->first_valid_frame ) < 0 )
goto video_fail;
/* Force seeking at the next access for valid video frame. */
vdhp->last_sample_number = vdhp->sample_count + 1;
goto return_frame;
}
uint32_t start_number; /* number of sample, for normal decoding, where decoding starts excluding decoding delay */
uint32_t rap_number; /* number of sample, for seeking, where decoding starts excluding decoding delay */
int seek_mode = vdhp->seek_mode;
int roll_recovery = 0;
if( sample_number > vdhp->last_sample_number
&& sample_number <= vdhp->last_sample_number + vdhp->forward_seek_threshold )
{
start_number = vdhp->last_sample_number + 1 + config->delay_count;
rap_number = vdhp->last_rap_number;
}
else
{
roll_recovery = find_random_accessible_point( vdhp, sample_number, 0, &rap_number );
if( rap_number == vdhp->last_rap_number && sample_number > vdhp->last_sample_number )
{
roll_recovery = 0;
start_number = vdhp->last_sample_number + 1 + config->delay_count;
}
else
{
/* Require starting to decode from random accessible sample. */
vdhp->last_rap_number = rap_number;
start_number = seek_video( vdhp, picture, sample_number, rap_number, roll_recovery || seek_mode != SEEK_MODE_NORMAL );
}
}
/* Get the desired picture. */
int error_count = 0;
while( start_number == 0 /* Failed to seek. */
|| config->update_pending /* Need to update the decoder configuration to decode pictures. */
|| get_picture( vdhp, picture, start_number, sample_number + config->delay_count ) < 0 )
{
if( config->update_pending )
{
roll_recovery = find_random_accessible_point( vdhp, sample_number, 0, &rap_number );
vdhp->last_rap_number = rap_number;
}
else
{
/* Failed to get the desired picture. */
if( config->error || seek_mode == SEEK_MODE_AGGRESSIVE )
goto video_fail;
if( ++error_count > MAX_ERROR_COUNT || rap_number <= 1 )
{
if( seek_mode == SEEK_MODE_UNSAFE )
goto video_fail;
/* Retry to decode from the same random accessible sample with error ignorance. */
seek_mode = SEEK_MODE_AGGRESSIVE;
}
else
{
/* Retry to decode from more past random accessible sample. */
roll_recovery = find_random_accessible_point( vdhp, sample_number, rap_number - 1, &rap_number );
if( vdhp->last_rap_number == rap_number )
goto video_fail;
vdhp->last_rap_number = rap_number;
}
}
start_number = seek_video( vdhp, picture, sample_number, rap_number, roll_recovery || seek_mode != SEEK_MODE_NORMAL );
}
vdhp->last_sample_number = sample_number;
config_index = config->index;
return_frame:;
/* Don't exceed the maximum presentation size specified for each sequence. */
extended_summary_t *extended = &config->entries[ config_index - 1 ].extended;
if( config->ctx->width > extended->width )
config->ctx->width = extended->width;
if( config->ctx->height > extended->height )
config->ctx->height = extended->height;
return 0;
video_fail:
/* fatal error of decoding */
lw_log_show( &config->lh, LW_LOG_WARNING, "Couldn't read video frame." );
return -1;
#undef MAX_ERROR_COUNT
}
/* This function returns the number of the next sample. */
static uint32_t seek_video
(
libavsmash_video_decode_handler_t *vdhp,
AVFrame *picture,
uint32_t composition_sample_number,
uint32_t rap_number,
int error_ignorance
)
{
/* Prepare to decode from random accessible sample. */
codec_configuration_t *config = &vdhp->config;
if( config->update_pending )
/* Update the decoder configuration. */
update_configuration( vdhp->root, vdhp->track_id, config );
else
libavsmash_flush_buffers( config );
if( config->error )
return 0;
int got_picture;
int output_ready = 0;
uint64_t rap_cts = 0;
uint32_t i;
uint32_t decoder_delay = get_decoder_delay( config->ctx );
uint32_t goal = composition_sample_number + decoder_delay;
for( i = rap_number; i < goal; i++ )
{
if( config->index == config->queue.index )
config->delay_count = MIN( decoder_delay, i - rap_number );
int ret = decode_video_sample( vdhp, picture, &got_picture, i );
if( got_picture )
{
output_ready = 1;
if( decoder_delay > config->delay_count )
{
/* Shorten the distance to the goal if we got a frame earlier than expected. */
uint32_t new_decoder_delay = config->delay_count;
goal -= decoder_delay - new_decoder_delay;
decoder_delay = new_decoder_delay;
}
}
else if( output_ready )
{
/* More input samples are required to output and the goal become more distant. */
++decoder_delay;
++goal;
}
/* Some decoders return -1 when feeding a leading sample.
* We don't consider as an error if the return value -1 is caused by a leading sample since it's not fatal at all. */
if( i == vdhp->last_rap_number )
rap_cts = picture->pts;
if( ret == -1 && (uint64_t)picture->pts >= rap_cts && !error_ignorance )
{
lw_log_show( &config->lh, LW_LOG_WARNING, "Failed to decode a video frame." );
return 0;
}
else if( ret >= 1 )
/* No decoding occurs. */
break;
}
if( config->index == config->queue.index )
config->delay_count = MIN( decoder_delay, i - rap_number );
return i;
}
int libavsmash_video_setup_timestamp_info
(
libavsmash_video_decode_handler_t *vdhp,
libavsmash_video_output_handler_t *vohp,
int64_t *framerate_num,
int64_t *framerate_den
)
{
int err = -1;
uint64_t media_timescale = lsmash_get_media_timescale( vdhp->root, vdhp->track_id );
uint64_t media_duration = lsmash_get_media_duration_from_media_timeline( vdhp->root, vdhp->track_id );
if( media_duration == 0 )
media_duration = INT32_MAX;
if( vdhp->sample_count == 1 )
{
/* Calculate average framerate. */
reduce_fraction( &media_timescale, &media_duration );
*framerate_num = (int64_t)media_timescale;
*framerate_den = (int64_t)media_duration;
err = 0;
goto setup_finish;
}
lw_log_handler_t *lhp = &vdhp->config.lh;
lsmash_media_ts_list_t ts_list;
if( lsmash_get_media_timestamps( vdhp->root, vdhp->track_id, &ts_list ) < 0 )
{
lw_log_show( lhp, LW_LOG_ERROR, "Failed to get timestamps." );
goto setup_finish;
}
if( ts_list.sample_count != vdhp->sample_count )
{
lw_log_show( lhp, LW_LOG_ERROR, "Failed to count number of video samples." );
goto setup_finish;
}
uint32_t composition_sample_delay;
if( lsmash_get_max_sample_delay( &ts_list, &composition_sample_delay ) < 0 )
{
lsmash_delete_media_timestamps( &ts_list );
lw_log_show( lhp, LW_LOG_ERROR, "Failed to get composition delay." );
goto setup_finish;
}
if( composition_sample_delay )
{
/* Consider composition order for keyframe detection.
* Note: sample number for L-SMASH is 1-origin. */
vdhp->order_converter = (order_converter_t *)lw_malloc_zero( (ts_list.sample_count + 1) * sizeof(order_converter_t) );
if( !vdhp->order_converter )
{
lsmash_delete_media_timestamps( &ts_list );
lw_log_show( lhp, LW_LOG_ERROR, "Failed to allocate memory." );
goto setup_finish;
}
for( uint32_t i = 0; i < ts_list.sample_count; i++ )
ts_list.timestamp[i].dts = i + 1;
lsmash_sort_timestamps_composition_order( &ts_list );
for( uint32_t i = 0; i < ts_list.sample_count; i++ )
vdhp->order_converter[i + 1].composition_to_decoding = (uint32_t)ts_list.timestamp[i].dts;
}
/* Calculate average framerate. */
uint64_t largest_cts = ts_list.timestamp[0].cts;
uint64_t second_largest_cts = 0;
uint64_t first_duration = ts_list.timestamp[1].cts - ts_list.timestamp[0].cts;
uint64_t composition_timebase = first_duration;
int strict_cfr = 1;
for( uint32_t i = 1; i < ts_list.sample_count; i++ )
{
uint64_t duration = ts_list.timestamp[i].cts - ts_list.timestamp[i - 1].cts;
if( duration == 0 )
{
lsmash_delete_media_timestamps( &ts_list );
lw_log_show( lhp, LW_LOG_WARNING, "Detected CTS duplication at frame %" PRIu32, i );
err = 0;
goto setup_finish;
}
if( strict_cfr && duration != first_duration )
strict_cfr = 0;
composition_timebase = get_gcd( composition_timebase, duration );
second_largest_cts = largest_cts;
largest_cts = ts_list.timestamp[i].cts;
}
uint64_t reduce = reduce_fraction( &media_timescale, &composition_timebase );
uint64_t composition_duration = ((largest_cts - ts_list.timestamp[0].cts) + (largest_cts - second_largest_cts)) / reduce;
lsmash_delete_media_timestamps( &ts_list );
double avg_frame_rate = (vdhp->sample_count * ((double)media_timescale / composition_duration));
if( strict_cfr || !lw_try_rational_framerate( avg_frame_rate, framerate_num, framerate_den, composition_timebase ) )
{
uint64_t num = (uint64_t)(avg_frame_rate * composition_timebase + 0.5);
uint64_t den = composition_timebase;
if( num && den )
reduce_fraction( &num, &den );
else
{
num = 1;
den = 1;
}
*framerate_num = (int64_t)num;
*framerate_den = (int64_t)den;
}
err = 0;
setup_finish:;
if( vohp->vfr2cfr )
{
/* Override average framerate by specified output constant framerate. */
*framerate_num = (int64_t)vohp->cfr_num;
*framerate_den = (int64_t)vohp->cfr_den;
vohp->frame_count = ((double)vohp->cfr_num / vohp->cfr_den)
* ((double)media_duration / media_timescale)
+ 0.5;
}
else
vohp->frame_count = libavsmash_video_get_sample_count( vdhp );
uint32_t min_cts_sample_number = get_decoding_sample_number( vdhp->order_converter, 1 );
vdhp->config.error = lsmash_get_cts_from_media_timeline( vdhp->root, vdhp->track_id, min_cts_sample_number, &vdhp->min_cts );
return err;
}
uint64_t lwlibav_audio_get_pcm_samples
(
lwlibav_audio_decode_handler_t *adhp,
lwlibav_audio_output_handler_t *aohp,
void *buf,
int64_t start,
int64_t wanted_length
)
{
if( adhp->error )
return 0;
uint32_t frame_number;
uint32_t rap_number = 0;
uint32_t past_rap_number = 0;
uint64_t output_length = 0;
enum audio_output_flag output_flags = AUDIO_OUTPUT_NO_FLAGS;
AVPacket *pkt = &adhp->packet;
AVPacket *alter_pkt = &adhp->alter_packet;
int already_gotten;
aohp->request_length = wanted_length;
if( start > 0 && start == adhp->next_pcm_sample_number )
{
frame_number = adhp->last_frame_number;
output_length += output_pcm_samples_from_buffer( aohp, adhp->frame_buffer, (uint8_t **)&buf, &output_flags );
if( output_flags & AUDIO_OUTPUT_ENOUGH )
goto audio_out;
if( alter_pkt->size <= 0 )
++frame_number;
aohp->output_sample_offset = 0;
already_gotten = 0;
}
else
{
/* Seek audio stream. */
adhp->next_pcm_sample_number = 0;
adhp->last_frame_number = 0;
/* Get frame_number. */
uint64_t start_frame_pos;
if( start >= 0 )
start_frame_pos = start;
else
{
uint64_t silence_length = -start;
put_silence_audio_samples( (int)(silence_length * aohp->output_block_align), aohp->output_bits_per_sample == 8, (uint8_t **)&buf );
output_length += silence_length;
aohp->request_length -= silence_length;
start_frame_pos = 0;
}
frame_number = find_start_audio_frame( adhp, aohp->output_sample_rate, start_frame_pos, &aohp->output_sample_offset );
retry_seek:
av_packet_unref( pkt );
/* Flush audio resampler buffers. */
if( flush_resampler_buffers( aohp->avr_ctx ) < 0 )
{
adhp->error = 1;
lw_log_show( &adhp->lh, LW_LOG_FATAL,
"Failed to flush resampler buffers.\n"
"It is recommended you reopen the file." );
return 0;
}
/* Flush audio decoder buffers. */
lwlibav_extradata_handler_t *exhp = &adhp->exh;
int extradata_index = adhp->frame_list[frame_number].extradata_index;
if( extradata_index != exhp->current_index )
{
/* Update the extradata. */
rap_number = get_audio_rap( adhp, frame_number );
assert( rap_number != 0 );
lwlibav_update_configuration( (lwlibav_decode_handler_t *)adhp, rap_number, extradata_index, 0 );
}
else
lwlibav_flush_buffers( (lwlibav_decode_handler_t *)adhp );
if( adhp->error )
return 0;
/* Seek and get a audio packet. */
rap_number = seek_audio( adhp, frame_number, past_rap_number, pkt, output_flags != AUDIO_OUTPUT_NO_FLAGS ? adhp->frame_buffer : NULL );
already_gotten = 1;
}
do
{
if( already_gotten )
{
already_gotten = 0;
make_decodable_packet( alter_pkt, pkt );
}
else if( frame_number > adhp->frame_count )
{
av_packet_unref( pkt );
if( adhp->exh.delay_count || !(output_flags & AUDIO_OUTPUT_ENOUGH) )
{
/* Null packet */
av_init_packet( pkt );
make_null_packet( pkt );
*alter_pkt = *pkt;
if( adhp->exh.delay_count )
adhp->exh.delay_count -= 1;
}
else
goto audio_out;
}
else if( alter_pkt->size <= 0 )
{
/* Getting an audio packet must be after flushing all remaining samples in resampler's FIFO buffer. */
lwlibav_get_av_frame( adhp->format, adhp->stream_index, frame_number, pkt );
make_decodable_packet( alter_pkt, pkt );
}
/* Decode and output from an audio packet. */
output_flags = AUDIO_OUTPUT_NO_FLAGS;
output_length += output_pcm_samples_from_packet( aohp, adhp->ctx, alter_pkt, adhp->frame_buffer, (uint8_t **)&buf, &output_flags );
if( output_flags & AUDIO_DECODER_DELAY )
{
if( rap_number > 1 && (output_flags & AUDIO_DECODER_ERROR) )
{
/* Retry to seek from more past audio keyframe because libavformat might have failed seek.
* This operation occurs only at the first decoding time after seek. */
past_rap_number = get_audio_rap( adhp, rap_number - 1 );
if( past_rap_number
&& past_rap_number < rap_number )
goto retry_seek;
}
++ adhp->exh.delay_count;
}
else
/* Disable seek retry. */
rap_number = 0;
if( output_flags & AUDIO_RECONFIG_FAILURE )
{
adhp->error = 1;
lw_log_show( &adhp->lh, LW_LOG_FATAL,
"Failed to reconfigure resampler.\n"
"It is recommended you reopen the file." );
goto audio_out;
}
if( output_flags & AUDIO_OUTPUT_ENOUGH )
goto audio_out;
if( output_flags & (AUDIO_DECODER_ERROR | AUDIO_DECODER_RECEIVED_PACKET) )
++frame_number;
} while( 1 );
audio_out:
adhp->next_pcm_sample_number = start + output_length;
adhp->last_frame_number = frame_number;
return output_length;
}
uint64_t libavsmash_audio_get_pcm_samples
(
libavsmash_audio_decode_handler_t *adhp,
libavsmash_audio_output_handler_t *aohp,
void *buf,
int64_t start,
int64_t wanted_length
)
{
codec_configuration_t *config = &adhp->config;
if( config->error )
return 0;
uint32_t frame_number;
uint64_t output_length = 0;
enum audio_output_flag output_flags;
aohp->request_length = wanted_length;
if( start > 0 && start == adhp->next_pcm_sample_number )
{
frame_number = adhp->last_frame_number;
output_flags = AUDIO_OUTPUT_NO_FLAGS;
output_length += output_pcm_samples_from_buffer( aohp, adhp->frame_buffer, (uint8_t **)&buf, &output_flags );
if( output_flags & AUDIO_OUTPUT_ENOUGH )
goto audio_out;
if( adhp->packet.size <= 0 )
++frame_number;
aohp->output_sample_offset = 0;
}
else
{
/* Seek audio stream. */
if( flush_resampler_buffers( aohp->avr_ctx ) < 0 )
{
config->error = 1;
lw_log_show( &config->lh, LW_LOG_FATAL,
"Failed to flush resampler buffers.\n"
"It is recommended you reopen the file." );
return 0;
}
libavsmash_flush_buffers( config );
if( config->error )
return 0;
adhp->next_pcm_sample_number = 0;
adhp->last_frame_number = 0;
uint64_t start_frame_pos;
if( start >= 0 )
start_frame_pos = start;
else
{
uint64_t silence_length = -start;
put_silence_audio_samples( (int)(silence_length * aohp->output_block_align), aohp->output_bits_per_sample == 8, (uint8_t **)&buf );
output_length += silence_length;
aohp->request_length -= silence_length;
start_frame_pos = 0;
}
start_frame_pos += aohp->skip_decoded_samples;
frame_number = find_start_audio_frame( adhp, aohp->output_sample_rate, aohp->skip_decoded_samples, start_frame_pos, &aohp->output_sample_offset );
}
do
{
AVPacket *pkt = &adhp->packet;
if( frame_number > adhp->frame_count )
{
if( config->delay_count )
{
/* Null packet */
av_init_packet( pkt );
pkt->data = NULL;
pkt->size = 0;
-- config->delay_count;
}
else
goto audio_out;
}
else if( pkt->size <= 0 )
/* Getting an audio packet must be after flushing all remaining samples in resampler's FIFO buffer. */
while( get_sample( adhp->root, adhp->track_id, frame_number, config, pkt ) == 2 )
if( config->update_pending )
/* Update the decoder configuration. */
update_configuration( adhp->root, adhp->track_id, config );
/* Decode and output from an audio packet. */
output_flags = AUDIO_OUTPUT_NO_FLAGS;
output_length += output_pcm_samples_from_packet( aohp, config->ctx, pkt, adhp->frame_buffer, (uint8_t **)&buf, &output_flags );
if( output_flags & AUDIO_DECODER_DELAY )
++ config->delay_count;
if( output_flags & AUDIO_RECONFIG_FAILURE )
{
config->error = 1;
lw_log_show( &config->lh, LW_LOG_FATAL,
"Failed to reconfigure resampler.\n"
"It is recommended you reopen the file." );
goto audio_out;
}
if( output_flags & AUDIO_OUTPUT_ENOUGH )
goto audio_out;
++frame_number;
} while( 1 );
audio_out:
adhp->next_pcm_sample_number = start + output_length;
adhp->last_frame_number = frame_number;
return output_length;
}
void lwlibav_update_configuration
(
lwlibav_decode_handler_t *dhp,
uint32_t frame_number,
int extradata_index,
int64_t rap_pos
)
{
lwlibav_extradata_handler_t *exhp = &dhp->exh;
if( exhp->entry_count == 0 || extradata_index < 0 )
{
/* No need to update the extradata. */
exhp->current_index = extradata_index;
lwlibav_flush_buffers( dhp );
return;
}
AVCodecContext *ctx = dhp->format->streams[ dhp->stream_index ]->codec;
void *app_specific = ctx->opaque;
avcodec_close( ctx );
if( ctx->extradata )
{
av_freep( &ctx->extradata );
ctx->extradata_size = 0;
}
/* Find an appropriate decoder. */
char error_string[96] = { 0 };
lwlibav_extradata_t *entry = &exhp->entries[extradata_index];
const AVCodec *codec = find_decoder( entry->codec_id, dhp->preferred_decoder_names );
if( !codec )
{
strcpy( error_string, "Failed to find the decoder.\n" );
goto fail;
}
/* Get decoder default settings. */
int thread_count = ctx->thread_count;
if( avcodec_get_context_defaults3( ctx, codec ) < 0 )
{
strcpy( error_string, "Failed to get CODEC default.\n" );
goto fail;
}
/* Set up decoder basic settings. */
if( ctx->codec_type == AVMEDIA_TYPE_VIDEO )
set_video_basic_settings( dhp, frame_number );
else
set_audio_basic_settings( dhp, frame_number );
/* Update extradata. */
if( entry->extradata_size > 0 )
{
ctx->extradata = (uint8_t *)av_malloc( entry->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE );
if( !ctx->extradata )
{
strcpy( error_string, "Failed to allocate extradata.\n" );
goto fail;
}
ctx->extradata_size = entry->extradata_size;
memcpy( ctx->extradata, entry->extradata, ctx->extradata_size );
memset( ctx->extradata + ctx->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE );
}
/* AVCodecContext.codec_id is supposed to be set properly in avcodec_open2().
* See lwlibav_flush_buffers(), why this is needed. */
ctx->codec_id = AV_CODEC_ID_NONE;
/* This is needed by some CODECs such as UtVideo and raw video. */
ctx->codec_tag = entry->codec_tag;
/* Open an appropriate decoder.
* Here, we force single threaded decoding since some decoder doesn't do its proper initialization with multi-threaded decoding. */
ctx->thread_count = 1;
if( open_decoder( ctx, codec ) < 0 )
{
strcpy( error_string, "Failed to open decoder.\n" );
goto fail;
}
exhp->current_index = extradata_index;
exhp->delay_count = 0;
/* Set up decoder basic settings by actual decoding. */
if( ctx->codec_type == AVMEDIA_TYPE_VIDEO
? try_decode_video_frame( dhp, frame_number, rap_pos, error_string ) < 0
: try_decode_audio_frame( dhp, frame_number, error_string ) < 0 )
goto fail;
/* Reopen/flush with the requested number of threads. */
ctx->thread_count = thread_count;
int width = ctx->width;
int height = ctx->height;
lwlibav_flush_buffers( dhp );
ctx->get_buffer2 = exhp->get_buffer ? exhp->get_buffer : avcodec_default_get_buffer2;
ctx->opaque = app_specific;
/* avcodec_open2() may have changed resolution unexpectedly. */
ctx->width = width;
ctx->height = height;
return;
fail:
exhp->delay_count = 0;
dhp->error = 1;
lw_log_show( &dhp->lh, LW_LOG_FATAL,
"%sIt is recommended you reopen the file.", error_string );
}