X-Git-Url: http://git.osdn.jp/view?a=blobdiff_plain;f=libhb%2Fcommon.c;h=f7b9ee384ab277f4e0e2ba972c87bc54833044a7;hb=55b0015a8c50106e553bc2f48336cc2a1c495459;hp=560a839e6c82b503faeb221ae5fefea8ffb4b4dc;hpb=e839809fd651c5e101562bdb0551c5010c1b4794;p=handbrake-jp%2Fhandbrake-jp-git.git
diff --git a/libhb/common.c b/libhb/common.c
index 560a839e..f7b9ee38 100644
--- a/libhb/common.c
+++ b/libhb/common.c
@@ -1,14 +1,16 @@
/* $Id: common.c,v 1.15 2005/03/17 19:22:47 titer Exp $
This file is part of the HandBrake source code.
- Homepage: .
+ Homepage: .
It may be used under the terms of the GNU General Public License. */
#include
-#include
+#include
#include
#include "common.h"
+#include "lang.h"
+#include "hb.h"
/**********************************************************************
* Global variables
@@ -31,11 +33,50 @@ hb_rate_t hb_audio_bitrates[] =
{ { "32", 32 }, { "40", 40 }, { "48", 48 }, { "56", 56 },
{ "64", 64 }, { "80", 80 }, { "96", 96 }, { "112", 112 },
{ "128", 128 }, { "160", 160 }, { "192", 192 }, { "224", 224 },
- { "256", 256 }, { "320", 320 } };
+ { "256", 256 }, { "320", 320 }, { "384", 384 }, { "448", 448 },
+ { "768", 768 } };
int hb_audio_bitrates_count = sizeof( hb_audio_bitrates ) /
sizeof( hb_rate_t );
int hb_audio_bitrates_default = 8; /* 128 kbps */
+static hb_error_handler_t *error_handler = NULL;
+
+hb_mixdown_t hb_audio_mixdowns[] =
+{ { "Mono", "HB_AMIXDOWN_MONO", "mono", HB_AMIXDOWN_MONO },
+ { "Stereo", "HB_AMIXDOWN_STEREO", "stereo", HB_AMIXDOWN_STEREO },
+ { "Dolby Surround", "HB_AMIXDOWN_DOLBY", "dpl1", HB_AMIXDOWN_DOLBY },
+ { "Dolby Pro Logic II", "HB_AMIXDOWN_DOLBYPLII", "dpl2", HB_AMIXDOWN_DOLBYPLII },
+ { "6-channel discrete", "HB_AMIXDOWN_6CH", "6ch", HB_AMIXDOWN_6CH }
+};
+int hb_audio_mixdowns_count = sizeof( hb_audio_mixdowns ) /
+ sizeof( hb_mixdown_t );
+
+int hb_mixdown_get_mixdown_from_short_name( const char * short_name )
+{
+ int i;
+ for (i = 0; i < hb_audio_mixdowns_count; i++)
+ {
+ if (strcmp(hb_audio_mixdowns[i].short_name, short_name) == 0)
+ {
+ return hb_audio_mixdowns[i].amixdown;
+ }
+ }
+ return 0;
+}
+
+const char * hb_mixdown_get_short_name_from_mixdown( int amixdown )
+{
+ int i;
+ for (i = 0; i < hb_audio_mixdowns_count; i++)
+ {
+ if (hb_audio_mixdowns[i].amixdown == amixdown)
+ {
+ return hb_audio_mixdowns[i].short_name;
+ }
+ }
+ return "";
+}
+
/**********************************************************************
* hb_reduce
**********************************************************************
@@ -44,18 +85,26 @@ int hb_audio_bitrates_default = 8; /* 128 kbps */
*********************************************************************/
void hb_reduce( int *x, int *y, int num, int den )
{
- int lower = MIN( num, den );
- int i;
- *x = num;
- *y = den;
- for( i = lower - 1; i > 1; --i )
+ // find the greatest common divisor of num & den by Euclid's algorithm
+ int n = num, d = den;
+ while ( d )
{
- if( ( num % i == 0 ) && ( den % i == 0 ) )
- {
- *x = num / i;
- *y = den / i;
- break;
- }
+ int t = d;
+ d = n % d;
+ n = t;
+ }
+
+ // at this point n is the gcd. if it's non-zero remove it from num
+ // and den. Otherwise just return the original values.
+ if ( n )
+ {
+ *x = num / n;
+ *y = den / n;
+ }
+ else
+ {
+ *x = num;
+ *y = den;
}
}
@@ -70,49 +119,60 @@ void hb_fix_aspect( hb_job_t * job, int keep )
{
hb_title_t * title = job->title;
int i;
+ int min_width;
+ int min_height;
+ int modulus;
+
+ /* don't do anything unless the title has complete size info */
+ if ( title->height == 0 || title->width == 0 || title->aspect == 0 )
+ {
+ hb_log( "hb_fix_aspect: incomplete info for title %d: "
+ "height = %d, width = %d, aspect = %.3f",
+ title->index, title->height, title->width, title->aspect );
+ return;
+ }
+
+ // min_width and min_height should be multiples of modulus
+ min_width = 32;
+ min_height = 32;
+ modulus = job->modulus ? job->modulus : 16;
- /* Sanity checks:
- Widths and heights must be multiples of 16 and greater than or
- equal to 16
- Crop values must be multiples of 2, greater than or equal to 0
- and less than half of the dimension */
- job->width = MULTIPLE_16( job->width );
- job->height = MULTIPLE_16( job->height );
- job->width = MAX( 16, job->width );
- job->height = MAX( 16, job->height );
for( i = 0; i < 4; i++ )
{
- job->crop[i] = EVEN( job->crop[i] );
- job->crop[i] = MAX( 0, job->crop[i] );
+ // Sanity check crop values are zero or positive multiples of 2
if( i < 2 )
{
- /* Top, bottom */
- job->crop[i] = MIN( job->crop[i], ( title->height / 2 ) - 2 );
+ // Top, bottom
+ job->crop[i] = MIN( EVEN( job->crop[i] ), EVEN( ( title->height / 2 ) - ( min_height / 2 ) ) );
+ job->crop[i] = MAX( 0, job->crop[i] );
}
else
{
- /* Left, right */
- job->crop[i] = MIN( job->crop[i], ( title->width / 2 ) - 2 );
+ // Left, right
+ job->crop[i] = MIN( EVEN( job->crop[i] ), EVEN( ( title->width / 2 ) - ( min_width / 2 ) ) );
+ job->crop[i] = MAX( 0, job->crop[i] );
}
}
+ double par = (double)title->width / ( (double)title->height * title->aspect );
+ double cropped_sar = (double)( title->height - job->crop[0] - job->crop[1] ) /
+ (double)( title->width - job->crop[2] - job->crop[3] );
+ double ar = par * cropped_sar;
+
+ // Dimensions must be greater than minimum and multiple of modulus
if( keep == HB_KEEP_WIDTH )
{
- job->height = MULTIPLE_16(
- (uint64_t) job->width * title->width * HB_ASPECT_BASE *
- ( title->height - job->crop[0] - job->crop[1] ) /
- ( (uint64_t) title->height * title->aspect *
- ( title->width - job->crop[2] - job->crop[3] ) ) );
- job->height = MAX( 16, job->height );
+ job->width = MULTIPLE_MOD( job->width, modulus );
+ job->width = MAX( min_width, job->width );
+ job->height = MULTIPLE_MOD( (uint64_t)( (double)job->width * ar ), modulus );
+ job->height = MAX( min_height, job->height );
}
else
{
- job->width = MULTIPLE_16(
- (uint64_t) job->height * title->height * title->aspect *
- ( title->width - job->crop[2] - job->crop[3] ) /
- ( (uint64_t) title->width * HB_ASPECT_BASE *
- ( title->height - job->crop[0] - job->crop[1] ) ) );
- job->width = MAX( 16, job->width );
+ job->height = MULTIPLE_MOD( job->height, modulus );
+ job->height = MAX( min_height, job->height );
+ job->width = MULTIPLE_MOD( (uint64_t)( (double)job->height / ar ), modulus );
+ job->width = MAX( min_width, job->width );
}
}
@@ -140,11 +200,12 @@ int hb_calc_bitrate( hb_job_t * job, int size )
case HB_MUX_MP4:
case HB_MUX_PSP:
case HB_MUX_IPOD:
+ case HB_MUX_MKV:
overhead = 6;
- break;
+ break;
case HB_MUX_AVI:
overhead = 24;
- break;
+ break;
case HB_MUX_OGM:
overhead = 6;
break;
@@ -152,23 +213,6 @@ int hb_calc_bitrate( hb_job_t * job, int size )
return 0;
}
- /* How many audio samples we put in each frame */
- switch( job->acodec )
- {
- case HB_ACODEC_FAAC:
- case HB_ACODEC_VORBIS:
- samples_per_frame = 1024;
- break;
- case HB_ACODEC_LAME:
- samples_per_frame = 1152;
- break;
- case HB_ACODEC_AC3:
- samples_per_frame = 1536;
- break;
- default:
- return 0;
- }
-
/* Get the duration in seconds */
length = 0;
for( i = job->chapter_start; i <= job->chapter_end; i++ )
@@ -179,28 +223,70 @@ int hb_calc_bitrate( hb_job_t * job, int size )
length += 135000;
length /= 90000;
+ if( size == -1 )
+ {
+ hb_interjob_t * interjob = hb_interjob_get( job->h );
+ avail = job->vbitrate * 125 * length;
+ avail += length * interjob->vrate * overhead / interjob->vrate_base;
+ }
+
/* Video overhead */
avail -= length * job->vrate * overhead / job->vrate_base;
- for( i = 0; job->audios[i] >= 0; i++ )
+ if( size == -1 )
+ {
+ goto ret;
+ }
+
+ for( i = 0; i < hb_list_count(job->list_audio); i++ )
{
/* Audio data */
int abitrate;
- if( job->acodec & HB_ACODEC_AC3 )
+ audio = hb_list_item( job->list_audio, i);
+
+ /* How many audio samples we put in each frame */
+ switch( audio->config.out.codec )
+ {
+ case HB_ACODEC_FAAC:
+ case HB_ACODEC_CA_AAC:
+ case HB_ACODEC_VORBIS:
+ samples_per_frame = 1024;
+ break;
+ case HB_ACODEC_LAME:
+ samples_per_frame = 1152;
+ break;
+ case HB_ACODEC_AC3:
+ case HB_ACODEC_DCA:
+ samples_per_frame = 1536;
+ break;
+ default:
+ return 0;
+ }
+
+ if( audio->config.out.codec == HB_ACODEC_AC3 ||
+ audio->config.out.codec == HB_ACODEC_DCA)
{
- audio = hb_list_item( title->list_audio, job->audios[i] );
- abitrate = audio->bitrate / 8;
+ /*
+ * For pass through we take the bitrate from the input audio
+ * bitrate as we are simply passing it through.
+ */
+ abitrate = audio->config.in.bitrate / 8;
}
else
{
- abitrate = job->abitrate * 1000 / 8;
+ /*
+ * Where we are transcoding the audio we use the destination
+ * bitrate.
+ */
+ abitrate = audio->config.out.bitrate * 1000 / 8;
}
avail -= length * abitrate;
-
+
/* Audio overhead */
- avail -= length * job->arate * overhead / samples_per_frame;
+ avail -= length * audio->config.out.samplerate * overhead / samples_per_frame;
}
+ret:
if( avail < 0 )
{
return 0;
@@ -341,7 +427,7 @@ int hb_list_bytes( hb_list_t * l )
ret += buf->size - buf->cur;
}
- return ret;
+ return ret;
}
/**********************************************************************
@@ -356,14 +442,14 @@ void hb_list_seebytes( hb_list_t * l, uint8_t * dst, int size )
int copied;
int copying;
int i;
-
+
for( i = 0, copied = 0; copied < size; i++ )
{
buf = hb_list_item( l, i );
copying = MIN( buf->size - buf->cur, size - copied );
memcpy( &dst[copied], &buf->data[buf->cur], copying );
copied += copying;
- }
+ }
}
/**********************************************************************
@@ -383,7 +469,7 @@ void hb_list_getbytes( hb_list_t * l, uint8_t * dst, int size,
int copied;
int copying;
uint8_t has_pts;
-
+
/* So we won't have to deal with NULL pointers */
uint64_t dummy1, dummy2;
@@ -411,7 +497,7 @@ void hb_list_getbytes( hb_list_t * l, uint8_t * dst, int size,
}
copied += copying;
- }
+ }
}
/**********************************************************************
@@ -454,11 +540,11 @@ void hb_list_close( hb_list_t ** _l )
* hb_log
**********************************************************************
* If verbose mode is one, print message with timestamp. Messages
- * longer than 80 characters are stripped ;p
+ * longer than 180 characters are stripped ;p
*********************************************************************/
void hb_log( char * log, ... )
{
- char string[82]; /* 80 chars + \n + \0 */
+ char string[362]; /* 360 chars + \n + \0 */
time_t _now;
struct tm * now;
va_list args;
@@ -477,7 +563,7 @@ void hb_log( char * log, ... )
/* Convert the message to a string */
va_start( args, log );
- vsnprintf( string + 11, 69, log, args );
+ vsnprintf( string + 11, 349, log, args );
va_end( args );
/* Add the end of line */
@@ -487,12 +573,154 @@ void hb_log( char * log, ... )
fprintf( stderr, "%s", string );
}
+int global_verbosity_level; //Necessary for hb_deep_log
+/**********************************************************************
+ * hb_deep_log
+ **********************************************************************
+ * If verbose mode is >= level, print message with timestamp. Messages
+ * longer than 360 characters are stripped ;p
+ *********************************************************************/
+void hb_deep_log( hb_debug_level_t level, char * log, ... )
+{
+ char string[362]; /* 360 chars + \n + \0 */
+ time_t _now;
+ struct tm * now;
+ va_list args;
+
+ if( global_verbosity_level < level )
+ {
+ /* Hiding message */
+ return;
+ }
+
+ /* Get the time */
+ _now = time( NULL );
+ now = localtime( &_now );
+ sprintf( string, "[%02d:%02d:%02d] ",
+ now->tm_hour, now->tm_min, now->tm_sec );
+
+ /* Convert the message to a string */
+ va_start( args, log );
+ vsnprintf( string + 11, 349, log, args );
+ va_end( args );
+
+ /* Add the end of line */
+ strcat( string, "\n" );
+
+ /* Print it */
+ fprintf( stderr, "%s", string );
+}
+
+/**********************************************************************
+ * hb_error
+ **********************************************************************
+ * Using whatever output is available display this error.
+ *********************************************************************/
+void hb_error( char * log, ... )
+{
+ char string[181]; /* 180 chars + \0 */
+ char rep_string[181];
+ static char last_string[181];
+ static int last_error_count = 0;
+ static uint64_t last_series_error_time = 0;
+ static hb_lock_t *mutex = 0;
+ va_list args;
+ uint64_t time_now;
+
+ /* Convert the message to a string */
+ va_start( args, log );
+ vsnprintf( string, 180, log, args );
+ va_end( args );
+
+ if( !mutex )
+ {
+ mutex = hb_lock_init();
+ }
+
+ hb_lock( mutex );
+
+ time_now = hb_get_date();
+
+ if( strcmp( string, last_string) == 0 )
+ {
+ /*
+ * The last error and this one are the same, don't log it
+ * just count it instead, unless it was more than one second
+ * ago.
+ */
+ last_error_count++;
+ if( last_series_error_time + ( 1000 * 1 ) > time_now )
+ {
+ hb_unlock( mutex );
+ return;
+ }
+ }
+
+ /*
+ * A new error, or the same one more than 10sec since the last one
+ * did we have any of the same counted up?
+ */
+ if( last_error_count > 0 )
+ {
+ /*
+ * Print out the last error to ensure context for the last
+ * repeated message.
+ */
+ if( error_handler )
+ {
+ error_handler( last_string );
+ } else {
+ hb_log( "%s", last_string );
+ }
+
+ if( last_error_count > 1 )
+ {
+ /*
+ * Only print out the repeat message for more than 2 of the
+ * same, since we just printed out two of them already.
+ */
+ snprintf( rep_string, 180, "Last error repeated %d times",
+ last_error_count - 1 );
+
+ if( error_handler )
+ {
+ error_handler( rep_string );
+ } else {
+ hb_log( "%s", rep_string );
+ }
+ }
+
+ last_error_count = 0;
+ }
+
+ last_series_error_time = time_now;
+
+ strcpy( last_string, string );
+
+ /*
+ * Got the error in a single string, send it off to be dispatched.
+ */
+ if( error_handler )
+ {
+ error_handler( string );
+ } else {
+ hb_log( "%s", string );
+ }
+
+ hb_unlock( mutex );
+}
+
+void hb_register_error_handler( hb_error_handler_t * handler )
+{
+ error_handler = handler;
+}
+
/**********************************************************************
* hb_title_init
**********************************************************************
- *
+ *
*********************************************************************/
-hb_title_t * hb_title_init( char * dvd, int index )
+hb_title_t * hb_title_init( char * path, int index )
{
hb_title_t * t;
@@ -502,7 +730,10 @@ hb_title_t * hb_title_init( char * dvd, int index )
t->list_audio = hb_list_init();
t->list_chapter = hb_list_init();
t->list_subtitle = hb_list_init();
- strcat( t->dvd, dvd );
+ strcat( t->path, path );
+ // default to decoding mpeg2
+ t->video_id = 0xE0;
+ t->video_codec = WORK_DECMPEG2;
return t;
}
@@ -510,7 +741,7 @@ hb_title_t * hb_title_init( char * dvd, int index )
/**********************************************************************
* hb_title_close
**********************************************************************
- *
+ *
*********************************************************************/
void hb_title_close( hb_title_t ** _t )
{
@@ -525,14 +756,14 @@ void hb_title_close( hb_title_t ** _t )
free( audio );
}
hb_list_close( &t->list_audio );
-
+
while( ( chapter = hb_list_item( t->list_chapter, 0 ) ) )
{
hb_list_rem( t->list_chapter, chapter );
free( chapter );
}
hb_list_close( &t->list_chapter );
-
+
while( ( subtitle = hb_list_item( t->list_subtitle, 0 ) ) )
{
hb_list_rem( t->list_subtitle, subtitle );
@@ -540,7 +771,321 @@ void hb_title_close( hb_title_t ** _t )
}
hb_list_close( &t->list_subtitle );
+ if( t->metadata )
+ {
+ if( t->metadata->coverart )
+ {
+ free( t->metadata->coverart );
+ }
+ free( t->metadata );
+ }
+
free( t );
*_t = NULL;
}
+/**********************************************************************
+ * hb_filter_close
+ **********************************************************************
+ *
+ *********************************************************************/
+void hb_filter_close( hb_filter_object_t ** _f )
+{
+ hb_filter_object_t * f = *_f;
+
+ f->close( f->private_data );
+
+ if( f->name )
+ free( f->name );
+ if( f->settings )
+ free( f->settings );
+
+ free( f );
+ *_f = NULL;
+}
+
+/**********************************************************************
+ * hb_audio_copy
+ **********************************************************************
+ *
+ *********************************************************************/
+hb_audio_t *hb_audio_copy(const hb_audio_t *src)
+{
+ hb_audio_t *audio = NULL;
+
+ if( src )
+ {
+ audio = calloc(1, sizeof(*audio));
+ memcpy(audio, src, sizeof(*audio));
+ }
+ return audio;
+}
+
+/**********************************************************************
+ * hb_audio_new
+ **********************************************************************
+ *
+ *********************************************************************/
+void hb_audio_config_init(hb_audio_config_t * audiocfg)
+{
+ /* Set read only paramaters to invalid values */
+ audiocfg->in.codec = 0xDEADBEEF;
+ audiocfg->in.bitrate = -1;
+ audiocfg->in.samplerate = -1;
+ audiocfg->in.channel_layout = 0;
+ audiocfg->in.version = 0;
+ audiocfg->in.mode = 0;
+ audiocfg->flags.ac3 = 0;
+ audiocfg->lang.description[0] = 0;
+ audiocfg->lang.simple[0] = 0;
+ audiocfg->lang.iso639_2[0] = 0;
+
+ /* Initalize some sensable defaults */
+ audiocfg->in.track = audiocfg->out.track = 0;
+ audiocfg->out.codec = HB_ACODEC_FAAC;
+ audiocfg->out.bitrate = 128;
+ audiocfg->out.samplerate = 44100;
+ audiocfg->out.mixdown = HB_AMIXDOWN_DOLBYPLII;
+ audiocfg->out.dynamic_range_compression = 0;
+ audiocfg->out.name = NULL;
+}
+
+/**********************************************************************
+ * hb_audio_add
+ **********************************************************************
+ *
+ *********************************************************************/
+int hb_audio_add(const hb_job_t * job, const hb_audio_config_t * audiocfg)
+{
+ hb_title_t *title = job->title;
+ hb_audio_t *audio;
+
+ audio = hb_audio_copy( hb_list_item( title->list_audio, audiocfg->in.track ) );
+ if( audio == NULL )
+ {
+ /* We fail! */
+ return 0;
+ }
+
+ if( (audiocfg->in.bitrate != -1) && (audiocfg->in.codec != 0xDEADBEEF) )
+ {
+ /* This most likely means the client didn't call hb_audio_config_init
+ * so bail.
+ */
+ return 0;
+ }
+
+ /* Really shouldn't ignore the passed out track, but there is currently no
+ * way to handle duplicates or out-of-order track numbers.
+ */
+ audio->config.out.track = hb_list_count(job->list_audio) + 1;
+ audio->config.out.codec = audiocfg->out.codec;
+ if( audiocfg->out.codec == audio->config.in.codec )
+ {
+ /* Pass-through, copy from input. */
+ audio->config.out.samplerate = audio->config.in.samplerate;
+ audio->config.out.bitrate = audio->config.in.bitrate;
+ audio->config.out.dynamic_range_compression = 0;
+ audio->config.out.mixdown = 0;
+ }
+ else
+ {
+ /* Non pass-through, use what is given. */
+ audio->config.out.samplerate = audiocfg->out.samplerate;
+ audio->config.out.bitrate = audiocfg->out.bitrate;
+ audio->config.out.dynamic_range_compression = audiocfg->out.dynamic_range_compression;
+ audio->config.out.mixdown = audiocfg->out.mixdown;
+ }
+
+ hb_list_add(job->list_audio, audio);
+ return 1;
+}
+
+hb_audio_config_t * hb_list_audio_config_item(hb_list_t * list, int i)
+{
+ hb_audio_t *audio = NULL;
+
+ if( (audio = hb_list_item(list, i)) )
+ return &(audio->config);
+
+ return NULL;
+}
+
+/**********************************************************************
+ * hb_subtitle_copy
+ **********************************************************************
+ *
+ *********************************************************************/
+hb_subtitle_t *hb_subtitle_copy(const hb_subtitle_t *src)
+{
+ hb_subtitle_t *subtitle = NULL;
+
+ if( src )
+ {
+ subtitle = calloc(1, sizeof(*subtitle));
+ memcpy(subtitle, src, sizeof(*subtitle));
+ }
+ return subtitle;
+}
+
+/**********************************************************************
+ * hb_subtitle_add
+ **********************************************************************
+ *
+ *********************************************************************/
+int hb_subtitle_add(const hb_job_t * job, const hb_subtitle_config_t * subtitlecfg, int track)
+{
+ hb_title_t *title = job->title;
+ hb_subtitle_t *subtitle;
+
+ subtitle = hb_subtitle_copy( hb_list_item( title->list_subtitle, track ) );
+ if( subtitle == NULL )
+ {
+ /* We fail! */
+ return 0;
+ }
+ subtitle->config = *subtitlecfg;
+ hb_list_add(job->list_subtitle, subtitle);
+ return 1;
+}
+
+int hb_srt_add( const hb_job_t * job,
+ const hb_subtitle_config_t * subtitlecfg,
+ const char *lang )
+{
+ hb_subtitle_t *subtitle;
+ iso639_lang_t *language = NULL;
+ int retval = 0;
+
+ subtitle = calloc( 1, sizeof( *subtitle ) );
+
+ subtitle->id = (hb_list_count(job->list_subtitle) << 8) | 0xFF;
+ subtitle->format = TEXTSUB;
+ subtitle->source = SRTSUB;
+
+ language = lang_for_code2( lang );
+
+ if( language )
+ {
+
+ strcpy( subtitle->lang, language->eng_name );
+ strncpy( subtitle->iso639_2, lang, 4 );
+
+ subtitle->config = *subtitlecfg;
+ subtitle->config.dest = PASSTHRUSUB;
+
+ hb_list_add(job->list_subtitle, subtitle);
+ retval = 1;
+ }
+ return retval;
+}
+
+char * hb_strdup_printf( char * fmt, ... )
+{
+ int len;
+ va_list ap;
+ int size = 256;
+ char * str;
+ char * tmp;
+
+ str = malloc( size );
+ if ( str == NULL )
+ return NULL;
+
+ while (1)
+ {
+ /* Try to print in the allocated space. */
+ va_start( ap, fmt );
+ len = vsnprintf( str, size, fmt, ap );
+ va_end( ap );
+
+ /* If that worked, return the string. */
+ if ( len > -1 && len < size )
+ {
+ return str;
+ }
+
+ /* Else try again with more space. */
+ if ( len > -1 ) /* glibc 2.1 */
+ size = len + 1; /* precisely what is needed */
+ else /* glibc 2.0 */
+ size *= 2; /* twice the old size */
+ tmp = realloc( str, size );
+ if ( tmp == NULL )
+ {
+ free( str );
+ return NULL;
+ }
+ else
+ str = tmp;
+ }
+}
+
+/**********************************************************************
+ * hb_yuv2rgb
+ **********************************************************************
+ * Converts a YCbCr pixel to an RGB pixel.
+ *
+ * This conversion is lossy (due to rounding and clamping).
+ *
+ * Algorithm:
+ * http://en.wikipedia.org/w/index.php?title=YCbCr&oldid=361987695#Technical_details
+ *********************************************************************/
+int hb_yuv2rgb(int yuv)
+{
+ double y, Cr, Cb;
+ int r, g, b;
+
+ y = (yuv >> 16) & 0xff;
+ Cb = (yuv >> 8) & 0xff;
+ Cr = (yuv ) & 0xff;
+
+ r = 1.164 * (y - 16) + 2.018 * (Cb - 128);
+ g = 1.164 * (y - 16) - 0.813 * (Cr - 128) - 0.391 * (Cb - 128);
+ b = 1.164 * (y - 16) + 1.596 * (Cr - 128);
+
+ r = (r < 0) ? 0 : r;
+ g = (g < 0) ? 0 : g;
+ b = (b < 0) ? 0 : b;
+
+ r = (r > 255) ? 255 : r;
+ g = (g > 255) ? 255 : g;
+ b = (b > 255) ? 255 : b;
+
+ return (r << 16) | (g << 8) | b;
+}
+
+/**********************************************************************
+ * hb_rgb2yuv
+ **********************************************************************
+ * Converts an RGB pixel to a YCbCr pixel.
+ *
+ * This conversion is lossy (due to rounding and clamping).
+ *
+ * Algorithm:
+ * http://en.wikipedia.org/w/index.php?title=YCbCr&oldid=361987695#Technical_details
+ *********************************************************************/
+int hb_rgb2yuv(int rgb)
+{
+ double r, g, b;
+ int y, Cr, Cb;
+
+ r = (rgb >> 16) & 0xff;
+ g = (rgb >> 8) & 0xff;
+ b = (rgb ) & 0xff;
+
+ y = 16. + ( 0.257 * r) + (0.504 * g) + (0.098 * b);
+ Cb = 128. + (-0.148 * r) - (0.291 * g) + (0.439 * b);
+ Cr = 128. + ( 0.439 * r) - (0.368 * g) - (0.071 * b);
+
+ y = (y < 0) ? 0 : y;
+ Cb = (Cb < 0) ? 0 : Cb;
+ Cr = (Cr < 0) ? 0 : Cr;
+
+ y = (y > 255) ? 255 : y;
+ Cb = (Cb > 255) ? 255 : Cb;
+ Cr = (Cr > 255) ? 255 : Cr;
+
+ return (y << 16) | (Cb << 8) | Cr;
+}
+