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/* $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.fr/>.
It may be used under the terms of the GNU General Public License. */
#include "hb.h"
#include "lame/lame.h"
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 =
{
WORK_ENCLAME,
"MP3 encoder (libmp3lame)",
enclameInit,
enclameWork,
enclameClose
};
struct hb_work_private_s
{
hb_job_t * job;
/* LAME handle */
lame_global_flags * lame;
int out_discrete_channels;
unsigned long input_samples;
unsigned long output_bytes;
uint8_t * buf;
hb_list_t * list;
int64_t pts;
};
int enclameInit( hb_work_object_t * w, hb_job_t * job )
{
hb_work_private_t * pv = calloc( 1, sizeof( hb_work_private_t ) );
hb_audio_t * audio = w->audio;
w->private_data = pv;
pv->job = job;
hb_log( "enclame: opening libmp3lame" );
pv->lame = lame_init();
// use ABR
lame_set_scale( pv->lame, 32768.0 );
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 ) );
audio->config.out.samples_per_frame = 1152;
pv->list = hb_list_init();
pv->pts = -1;
return 0;
}
/***********************************************************************
* Close
***********************************************************************
*
**********************************************************************/
void enclameClose( hb_work_object_t * w )
{
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;
}
/***********************************************************************
* Encode
***********************************************************************
*
**********************************************************************/
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;
float samples[2][1152];
uint64_t pts, pos;
int i, j;
if( hb_list_bytes( pv->list ) < pv->input_samples * sizeof( float ) )
{
return NULL;
}
hb_list_getbytes( pv->list, pv->buf, pv->input_samples * sizeof( float ),
&pts, &pos);
for( i = 0; i < 1152; 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( 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->frametype = HB_FRAME_AUDIO;
if( !buf->size )
{
/* Encoding was successful but we got no data. Try to encode
more */
hb_buffer_close( &buf );
return Encode( w );
}
else if( buf->size < 0 )
{
hb_log( "enclame: lame_encode_buffer failed" );
hb_buffer_close( &buf );
return NULL;
}
return buf;
}
/***********************************************************************
* Work
***********************************************************************
*
**********************************************************************/
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;
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 );
while( buf )
{
buf->next = Encode( w );
buf = buf->next;
}
return HB_WORK_OK;
}
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