/* $Id: enclame.c,v 1.9 2005/03/05 14:27:05 titer Exp $
This file is part of the HandBrake source code.
- Homepage: <http://handbrake.m0k.org/>.
+ Homepage: <http://handbrake.fr/>.
It may be used under the terms of the GNU General Public License. */
#include "hb.h"
#include "lame/lame.h"
-struct hb_work_object_s
+int enclameInit( hb_work_object_t *, hb_job_t * );
+int enclameWork( hb_work_object_t *, hb_buffer_t **, hb_buffer_t ** );
+void enclameClose( hb_work_object_t * );
+
+hb_work_object_t hb_enclame =
{
- HB_WORK_COMMON;
+ WORK_ENCLAME,
+ "MP3 encoder (libmp3lame)",
+ enclameInit,
+ enclameWork,
+ enclameClose
+};
+struct hb_work_private_s
+{
hb_job_t * job;
- hb_audio_t * audio;
/* LAME handle */
lame_global_flags * lame;
+ int out_discrete_channels;
unsigned long input_samples;
unsigned long output_bytes;
uint8_t * buf;
int64_t pts;
};
-/***********************************************************************
- * Local prototypes
- **********************************************************************/
-static void Close( hb_work_object_t ** _w );
-static int Work( hb_work_object_t * w, hb_buffer_t ** buf_in,
- hb_buffer_t ** buf_out );
-
-/***********************************************************************
- * hb_work_enclame_init
- ***********************************************************************
- *
- **********************************************************************/
-hb_work_object_t * hb_work_enclame_init( hb_job_t * job, hb_audio_t * audio )
+int enclameInit( hb_work_object_t * w, hb_job_t * job )
{
- hb_work_object_t * w = calloc( sizeof( hb_work_object_t ), 1 );
- w->name = strdup( "MP3 encoder (libmp3lame)" );
- w->work = Work;
- w->close = Close;
+ hb_work_private_t * pv = calloc( 1, sizeof( hb_work_private_t ) );
+ hb_audio_t * audio = w->audio;
+
+ w->private_data = pv;
- w->job = job;
- w->audio = audio;
+ pv->job = job;
hb_log( "enclame: opening libmp3lame" );
- w->lame = lame_init();
- lame_set_brate( w->lame, job->abitrate );
- lame_set_in_samplerate( w->lame, job->arate );
- lame_set_out_samplerate( w->lame, job->arate );
- lame_init_params( w->lame );
-
- w->input_samples = 1152 * 2;
- w->output_bytes = LAME_MAXMP3BUFFER;
- w->buf = malloc( w->input_samples * sizeof( float ) );
+ pv->lame = lame_init();
+ // use ABR
+ lame_set_VBR( pv->lame, vbr_abr );
+ lame_set_VBR_mean_bitrate_kbps( pv->lame, audio->config.out.bitrate );
+ lame_set_in_samplerate( pv->lame, audio->config.out.samplerate );
+ lame_set_out_samplerate( pv->lame, audio->config.out.samplerate );
+
+ pv->out_discrete_channels = HB_AMIXDOWN_GET_DISCRETE_CHANNEL_COUNT(audio->config.out.mixdown);
+ // Lame's default encoding mode is JOINT_STEREO. This subtracts signal
+ // that is "common" to left and right (within some threshold) and encodes
+ // it separately. This improves quality at low bitrates, but hurts
+ // imaging (channel separation) at higher bitrates. So if the bitrate
+ // is suffeciently high, use regular STEREO mode.
+ if ( pv->out_discrete_channels == 1 )
+ {
+ lame_set_mode( pv->lame, MONO );
+ lame_set_num_channels( pv->lame, 1 );
+ }
+ else if ( audio->config.out.bitrate >= 128 )
+ {
+ lame_set_mode( pv->lame, STEREO );
+ }
+ lame_init_params( pv->lame );
+
+ pv->input_samples = 1152 * pv->out_discrete_channels;
+ pv->output_bytes = LAME_MAXMP3BUFFER;
+ pv->buf = malloc( pv->input_samples * sizeof( float ) );
- w->list = hb_list_init();
- w->pts = -1;
+ pv->list = hb_list_init();
+ pv->pts = -1;
- return w;
+ return 0;
}
/***********************************************************************
***********************************************************************
*
**********************************************************************/
-static void Close( hb_work_object_t ** _w )
+void enclameClose( hb_work_object_t * w )
{
- hb_work_object_t * w = *_w;
- free( w->name );
- free( w );
- *_w = NULL;
+ hb_work_private_t * pv = w->private_data;
+
+ lame_close( pv->lame );
+ hb_list_empty( &pv->list );
+ free( pv->buf );
+ free( pv );
+ w->private_data = NULL;
}
/***********************************************************************
**********************************************************************/
static hb_buffer_t * Encode( hb_work_object_t * w )
{
+ hb_work_private_t * pv = w->private_data;
+ hb_audio_t * audio = w->audio;
hb_buffer_t * buf;
- int16_t samples_s16[1152 * 2];
- uint64_t pts;
- int pos, i;
+ float samples[2][1152];
+ uint64_t pts, pos;
+ int i, j;
- if( hb_list_bytes( w->list ) < w->input_samples * sizeof( float ) )
+ if( hb_list_bytes( pv->list ) < pv->input_samples * sizeof( float ) )
{
return NULL;
}
- hb_list_getbytes( w->list, w->buf, w->input_samples * sizeof( float ),
+ hb_list_getbytes( pv->list, pv->buf, pv->input_samples * sizeof( float ),
&pts, &pos);
- for( i = 0; i < 1152 * 2; i++ )
+ memset(samples, 0, 2*1152*sizeof(float));
+ for( i = 0; i < 1152; i++ )
{
- samples_s16[i] = ((float*) w->buf)[i];
+ for( j = 0; j < pv->out_discrete_channels; j++ )
+ {
+ samples[j][i] = ((float *) pv->buf)[(pv->out_discrete_channels * i + j)];
+ }
}
- buf = hb_buffer_init( w->output_bytes );
- buf->start = pts + 90000 * pos / 2 / sizeof( float ) / w->job->arate;
- buf->stop = buf->start + 90000 * 1152 / w->job->arate;
- buf->size = lame_encode_buffer_interleaved( w->lame, samples_s16,
+ buf = hb_buffer_init( pv->output_bytes );
+ buf->start = pts + 90000 * pos / pv->out_discrete_channels / sizeof( float ) / audio->config.out.samplerate;
+ buf->stop = buf->start + 90000 * 1152 / audio->config.out.samplerate;
+ pv->pts = buf->stop;
+ buf->size = lame_encode_buffer_float(
+ pv->lame, samples[0], samples[1],
1152, buf->data, LAME_MAXMP3BUFFER );
- buf->key = 1;
+
+ buf->frametype = HB_FRAME_AUDIO;
if( !buf->size )
{
hb_buffer_close( &buf );
return NULL;
}
-
return buf;
}
***********************************************************************
*
**********************************************************************/
-static int Work( hb_work_object_t * w, hb_buffer_t ** buf_in,
+int enclameWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
hb_buffer_t ** buf_out )
{
+ hb_work_private_t * pv = w->private_data;
+ hb_audio_t * audio = w->audio;
+ hb_buffer_t * in = *buf_in;
hb_buffer_t * buf;
- hb_list_add( w->list, *buf_in );
+ if ( (*buf_in)->size <= 0 )
+ {
+ /* EOF on input - send it downstream & say we're done */
+
+ buf = hb_buffer_init( pv->output_bytes );
+ buf->size = lame_encode_flush( pv->lame, buf->data, LAME_MAXMP3BUFFER );
+ buf->start = pv->pts;
+ buf->stop = buf->start + 90000 * 1152 / audio->config.out.samplerate;
+ buf->frametype = HB_FRAME_AUDIO;
+ if( buf->size <= 0 )
+ {
+ hb_buffer_close( &buf );
+ }
+
+ // Add the flushed data
+ *buf_out = buf;
+
+ // Add the eof
+ if ( buf )
+ {
+ buf->next = in;
+ }
+ else
+ {
+ *buf_out = in;
+ }
+
+ *buf_in = NULL;
+ return HB_WORK_DONE;
+ }
+
+ hb_list_add( pv->list, *buf_in );
*buf_in = NULL;
*buf_out = buf = Encode( w );
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