1 /* $Id: muxmp4.c,v 1.24 2005/11/04 13:09:41 titer Exp $
3 This file is part of the HandBrake source code.
4 Homepage: <http://handbrake.fr/>.
5 It may be used under the terms of the GNU General Public License. */
12 void AddIPodUUID(MP4FileHandle, MP4TrackId);
14 struct hb_mux_object_s
23 /* Cumulated durations so far, in output & input timescale units (see MP4Mux) */
24 int64_t sum_dur; // duration in output timescale units
25 int64_t sum_dur_in; // duration in input 90KHz timescale units
27 // bias to keep render offsets in ctts atom positive (set up by encx264)
30 /* Chapter state information for muxing */
31 MP4TrackId chapter_track;
33 uint64_t chapter_duration;
35 /* Sample rate of the first audio track.
36 * Used for the timescale
46 struct hb_text_sample_s
53 /**********************************************************************
55 **********************************************************************
56 * Creates a buffer for a text track sample
57 *********************************************************************/
58 static struct hb_text_sample_s *MP4CreateTextSample( char *textString, uint64_t duration )
60 struct hb_text_sample_s *sample = NULL;
61 int stringLength = strlen(textString);
64 if( stringLength < 1024 )
66 sample = malloc( sizeof( struct hb_text_sample_s ) );
68 //textLength = (stringLength; // Account for BOM
69 sample->length = stringLength + 2 + 12; // Account for text length code and other marker
70 sample->duration = (MP4Duration)duration;
72 // 2-byte length marker
73 sample->sample[0] = (stringLength >> 8) & 0xff;
74 sample->sample[1] = stringLength & 0xff;
76 strncpy( (char *)&(sample->sample[2]), textString, stringLength );
80 // Modifier Length Marker
81 sample->sample[x] = 0x00;
82 sample->sample[x+1] = 0x00;
83 sample->sample[x+2] = 0x00;
84 sample->sample[x+3] = 0x0C;
87 sample->sample[x+4] = 'e';
88 sample->sample[x+5] = 'n';
89 sample->sample[x+6] = 'c';
90 sample->sample[x+7] = 'd';
93 sample->sample[x+8] = 0x00;
94 sample->sample[x+9] = 0x00;
95 sample->sample[x+10] = (256 >> 8) & 0xff;
96 sample->sample[x+11] = 256 & 0xff;
102 /**********************************************************************
103 * MP4GenerateChapterSample
104 **********************************************************************
105 * Creates a buffer for a text track sample
106 *********************************************************************/
107 static struct hb_text_sample_s *MP4GenerateChapterSample( hb_mux_object_t * m,
111 // We substract 1 from the chapter number because the chapters start at
112 // 1 but our name array starts at 0. We substract another 1 because we're
113 // writing the text of the previous chapter mark (when we get the start
114 // of chapter 2 we know the duration of chapter 1 & can write its mark).
115 hb_chapter_t *chapter_data = hb_list_item( m->job->title->list_chapter,
117 char tmp_buffer[1024];
118 char *string = tmp_buffer;
120 tmp_buffer[0] = '\0';
122 if( chapter_data != NULL )
124 string = chapter_data->title;
127 if( strlen(string) == 0 || strlen(string) >= 1024 )
129 snprintf( tmp_buffer, 1023, "Chapter %03i", chapter - 2 );
133 return MP4CreateTextSample( string, duration );
137 /**********************************************************************
139 **********************************************************************
140 * Allocates hb_mux_data_t structures, create file and write headers
141 *********************************************************************/
142 static int MP4Init( hb_mux_object_t * m )
144 hb_job_t * job = m->job;
145 hb_title_t * title = job->title;
148 hb_mux_data_t * mux_data;
150 u_int16_t language_code;
152 /* Flags for enabling/disabling tracks in an MP4. */
153 typedef enum { TRACK_DISABLED = 0x0, TRACK_ENABLED = 0x1, TRACK_IN_MOVIE = 0x2, TRACK_IN_PREVIEW = 0x4, TRACK_IN_POSTER = 0x8} track_header_flags;
155 if( (audio = hb_list_item(title->list_audio, 0)) != NULL )
157 /* Need the sample rate of the first audio track to use as the timescale. */
158 m->samplerate = audio->config.out.samplerate;
163 m->samplerate = 90000;
166 /* Create an empty mp4 file */
167 if (job->largeFileSize)
168 /* Use 64-bit MP4 file */
170 m->file = MP4Create( job->file, MP4_DETAILS_ERROR, MP4_CREATE_64BIT_DATA );
171 hb_log("Using 64-bit MP4 formatting.");
174 /* Limit MP4s to less than 4 GB */
176 m->file = MP4Create( job->file, MP4_DETAILS_ERROR, 0 );
179 if (m->file == MP4_INVALID_FILE_HANDLE)
181 hb_error("muxmp4.c: MP4Create failed!");
187 mux_data = malloc( sizeof( hb_mux_data_t ) );
188 job->mux_data = mux_data;
190 /* When using the standard 90000 timescale, QuickTime tends to have
191 synchronization issues (audio not playing at the correct speed).
192 To workaround this, we use the audio samplerate as the
194 if (!(MP4SetTimeScale( m->file, m->samplerate )))
196 hb_error("muxmp4.c: MP4SetTimeScale failed!");
201 if( job->vcodec == HB_VCODEC_X264 )
203 /* Stolen from mp4creator */
204 if(!(MP4SetVideoProfileLevel( m->file, 0x7F )))
206 hb_error("muxmp4.c: MP4SetVideoProfileLevel failed!");
211 mux_data->track = MP4AddH264VideoTrack( m->file, m->samplerate,
212 MP4_INVALID_DURATION, job->width, job->height,
213 job->config.h264.sps[1], /* AVCProfileIndication */
214 job->config.h264.sps[2], /* profile_compat */
215 job->config.h264.sps[3], /* AVCLevelIndication */
216 3 ); /* 4 bytes length before each NAL unit */
219 MP4AddH264SequenceParameterSet( m->file, mux_data->track,
220 job->config.h264.sps, job->config.h264.sps_length );
221 MP4AddH264PictureParameterSet( m->file, mux_data->track,
222 job->config.h264.pps, job->config.h264.pps_length );
224 if( job->h264_level == 30 || job->ipod_atom)
226 hb_log("About to add iPod atom");
227 AddIPodUUID(m->file, mux_data->track);
230 m->init_delay = job->config.h264.init_delay;
232 else /* FFmpeg or XviD */
234 if(!(MP4SetVideoProfileLevel( m->file, MPEG4_SP_L3 )))
236 hb_error("muxmp4.c: MP4SetVideoProfileLevel failed!");
240 mux_data->track = MP4AddVideoTrack( m->file, m->samplerate,
241 MP4_INVALID_DURATION, job->width, job->height,
242 MP4_MPEG4_VIDEO_TYPE );
243 if (mux_data->track == MP4_INVALID_TRACK_ID)
245 hb_error("muxmp4.c: MP4AddVideoTrack failed!");
251 /* VOL from FFmpeg or XviD */
252 if (!(MP4SetTrackESConfiguration( m->file, mux_data->track,
253 job->config.mpeg4.bytes, job->config.mpeg4.length )))
255 hb_error("muxmp4.c: MP4SetTrackESConfiguration failed!");
261 // COLR atom for color and gamma correction.
263 // http://developer.apple.com/quicktime/icefloe/dispatch019.html#colr
264 // http://forum.doom9.org/showthread.php?t=133982#post1090068
265 // we say anything that's likely to be HD content is ITU BT.709 and
266 // DVD, SD TV & other content is ITU BT.601. We look at the title height
267 // rather than the job height here to get uncropped input dimensions.
268 if ( job->title->height >= 720 )
270 // we guess that 720p or above is ITU BT.709 HD content
271 MP4AddColr(m->file, mux_data->track, 1, 1, 1);
275 // ITU BT.601 DVD or SD TV content
276 MP4AddColr(m->file, mux_data->track, 6, 1, 6);
279 if( job->pixel_ratio )
281 /* PASP atom for anamorphic video */
284 width = job->pixel_aspect_width;
286 height = job->pixel_aspect_height;
288 MP4AddPixelAspectRatio(m->file, mux_data->track, (uint32_t)width, (uint32_t)height);
290 MP4SetTrackFloatProperty(m->file, mux_data->track, "tkhd.width", job->width * (width / height));
293 /* add the audio tracks */
294 for( i = 0; i < hb_list_count( title->list_audio ); i++ )
296 static u_int8_t reserved2[16] = {
297 0x00, 0x00, 0x00, 0x00,
298 0x00, 0x00, 0x00, 0x00,
299 0x00, 0x02, 0x00, 0x10,
300 0x00, 0x00, 0x00, 0x00,
303 audio = hb_list_item( title->list_audio, i );
304 mux_data = malloc( sizeof( hb_mux_data_t ) );
305 audio->priv.mux_data = mux_data;
307 if( audio->config.out.codec == HB_ACODEC_AC3 )
309 mux_data->track = MP4AddAC3AudioTrack(
311 m->samplerate, 1536, MP4_MPEG4_AUDIO_TYPE );
312 MP4SetTrackBytesProperty(
313 m->file, mux_data->track,
315 (const u_int8_t*)"Surround", strlen("Surround"));
317 mux_data->track = MP4AddAudioTrack(
319 m->samplerate, 1024, MP4_MPEG4_AUDIO_TYPE );
320 MP4SetTrackBytesProperty(
321 m->file, mux_data->track,
323 (const u_int8_t*)"Stereo", strlen("Stereo"));
325 MP4SetAudioProfileLevel( m->file, 0x0F );
326 MP4SetTrackESConfiguration(
327 m->file, mux_data->track,
328 audio->priv.config.aac.bytes, audio->priv.config.aac.length );
330 /* Set the correct number of channels for this track */
331 reserved2[9] = (u_int8_t)HB_AMIXDOWN_GET_DISCRETE_CHANNEL_COUNT(audio->config.out.mixdown);
332 MP4SetTrackBytesProperty(m->file, mux_data->track, "mdia.minf.stbl.stsd.mp4a.reserved2", reserved2, sizeof(reserved2));
335 /* Set the language for this track */
336 /* The language is stored as 5-bit text - 0x60 */
337 language_code = audio->config.lang.iso639_2[0] - 0x60; language_code <<= 5;
338 language_code |= audio->config.lang.iso639_2[1] - 0x60; language_code <<= 5;
339 language_code |= audio->config.lang.iso639_2[2] - 0x60;
340 MP4SetTrackIntegerProperty(m->file, mux_data->track, "mdia.mdhd.language", language_code);
343 /* Set the audio track alternate group */
344 MP4SetTrackIntegerProperty(m->file, mux_data->track, "tkhd.alternate_group", 1);
346 /* If we ever upgrade mpeg4ip, the line above should be replaced with the line below.*/
347 // MP4SetTrackIntegerProperty(m->file, mux_data->track, "mdia.minf.stbl.stsd.mp4a.channels", (u_int16_t)HB_AMIXDOWN_GET_DISCRETE_CHANNEL_COUNT(audio->amixdown));
350 /* Enable the first audio track */
351 MP4SetTrackIntegerProperty(m->file, mux_data->track, "tkhd.flags", (TRACK_ENABLED | TRACK_IN_MOVIE));
354 /* Disable the other audio tracks so QuickTime doesn't play
357 MP4SetTrackIntegerProperty(m->file, mux_data->track, "tkhd.flags", (TRACK_DISABLED | TRACK_IN_MOVIE));
358 hb_log("Disabled extra audio track %i", mux_data->track-1);
363 if (job->chapter_markers)
365 /* add a text track for the chapters. We add the 'chap' atom to track
366 one which is usually the video track & should never be disabled.
367 The Quicktime spec says it doesn't matter which media track the
368 chap atom is on but it has to be an enabled track. */
369 MP4TrackId textTrack;
370 textTrack = MP4AddChapterTextTrack(m->file, 1);
372 m->chapter_track = textTrack;
373 m->chapter_duration = 0;
374 m->current_chapter = job->chapter_start;
377 /* Add encoded-by metadata listing version and build date */
379 tool_string = (char *)malloc(80);
380 snprintf( tool_string, 80, "HandBrake %s %i", HB_VERSION, HB_BUILD);
381 MP4SetMetadataTool(m->file, tool_string);
387 static int MP4Mux( hb_mux_object_t * m, hb_mux_data_t * mux_data,
390 hb_job_t * job = m->job;
394 if( mux_data == job->mux_data )
398 // if there are b-frames compute the render offset
399 // (we'll need it for both the video frame & the chapter track)
402 offset = ( buf->start + m->init_delay ) * m->samplerate / 90000 -
405 /* Add the sample before the new frame.
406 It is important that this be calculated prior to the duration
407 of the new video sample, as we want to sync to right after it.
408 (This is because of how durations for text tracks work in QT) */
409 if( job->chapter_markers && buf->new_chap )
411 struct hb_text_sample_s *sample;
413 // this chapter is postioned by writing out the previous chapter.
414 // the duration of the previous chapter is the duration up to but
415 // not including the current frame minus the duration of all
416 // chapters up to the previous.
417 duration = m->sum_dur - m->chapter_duration + offset;
420 /* The initial & final chapters can have very short durations
421 * (less than the error in our total duration estimate) so
422 * the duration calc above can result in a negative number.
423 * when this happens give the chapter a short duration (1/3
424 * of an ntsc frame time). */
425 duration = 1000 * m->samplerate / 90000;
428 sample = MP4GenerateChapterSample( m, duration, buf->new_chap );
430 if( !MP4WriteSample(m->file,
437 hb_error("Failed to write to output file, disk full?");
441 m->current_chapter = buf->new_chap;
442 m->chapter_duration += duration;
445 // since we're changing the sample rate we need to keep track of
446 // the truncation bias so that the audio and video don't go out
447 // of sync. m->sum_dur_in is the sum of the input durations so far.
448 // m->sum_dur is the sum of the output durations. Their difference
449 // (in output sample rate units) is the accumulated truncation bias.
450 int64_t bias = ( m->sum_dur_in * m->samplerate / 90000 ) - m->sum_dur;
451 int64_t dur_in = buf->stop - buf->start;
452 duration = dur_in * m->samplerate / 90000 + bias;
455 /* We got an illegal mp4/h264 duration. This shouldn't
456 be possible and usually indicates a bug in the upstream code.
457 Complain in the hope that someone will go find the bug but
458 try to fix the error so that the file will still be playable. */
459 hb_log("MP4Mux: illegal duration %lld, bias %lld, start %lld (%lld),"
460 "stop %lld (%lld), sum_dur %lld",
461 duration, bias, buf->start * m->samplerate / 90000, buf->start,
462 buf->stop * m->samplerate / 90000, buf->stop, m->sum_dur );
463 /* we don't know when the next frame starts so we can't pick a
464 valid duration for this one so we pick something "short"
465 (roughly 1/3 of an NTSC frame time) and rely on the bias calc
466 for the next frame to correct things (a duration underestimate
467 just results in a large bias on the next frame). */
468 duration = 1000 * m->samplerate / 90000;
470 m->sum_dur += duration;
471 m->sum_dur_in += dur_in;
476 duration = MP4_INVALID_DURATION;
479 // Here's where the sample actually gets muxed.
480 if( !MP4WriteSample( m->file,
486 ((buf->frametype & HB_FRAME_KEY) != 0) ) )
488 hb_error("Failed to write to output file, disk full?");
495 static int MP4End( hb_mux_object_t * m )
497 hb_job_t * job = m->job;
499 /* Write our final chapter marker */
500 if( m->job->chapter_markers )
502 int64_t duration = m->sum_dur - m->chapter_duration;
503 /* The final chapter can have a very short duration - if it's less
504 * than a second just skip it. */
505 if ( duration >= m->samplerate )
508 struct hb_text_sample_s *sample = MP4GenerateChapterSample( m, duration,
509 m->current_chapter + 1 );
510 if( ! MP4WriteSample(m->file, m->chapter_track, sample->sample,
511 sample->length, sample->duration, 0, true) )
513 hb_error("Failed to write to output file, disk full?");
522 // Insert track edit to get A/V back in sync. The edit amount is
524 int64_t edit_amt = m->init_delay * m->samplerate / 90000;
525 MP4AddTrackEdit(m->file, 1, MP4_INVALID_EDIT_ID, edit_amt,
526 MP4GetTrackDuration(m->file, 1), 0);
527 if ( m->job->chapter_markers )
529 // apply same edit to chapter track to keep it in sync with video
530 MP4AddTrackEdit(m->file, m->chapter_track, MP4_INVALID_EDIT_ID,
532 MP4GetTrackDuration(m->file, m->chapter_track), 0);
538 if ( job->mp4_optimize )
540 hb_log( "muxmp4: optimizing file" );
541 char filename[1024]; memset( filename, 0, 1024 );
542 snprintf( filename, 1024, "%s.tmp", job->file );
543 MP4Optimize( job->file, filename, MP4_DETAILS_ERROR );
545 rename( filename, job->file );
551 hb_mux_object_t * hb_mux_mp4_init( hb_job_t * job )
553 hb_mux_object_t * m = calloc( sizeof( hb_mux_object_t ), 1 );