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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.m0k.org/>.
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
{
HB_WORK_COMMON;
hb_job_t * job;
hb_audio_t * audio;
/* LAME handle */
lame_global_flags * lame;
unsigned long input_samples;
unsigned long output_bytes;
uint8_t * buf;
hb_list_t * list;
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 )
{
hb_work_object_t * w = calloc( sizeof( hb_work_object_t ), 1 );
w->name = strdup( "MP3 encoder (libmp3lame)" );
w->work = Work;
w->close = Close;
w->job = job;
w->audio = audio;
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 ) );
w->list = hb_list_init();
w->pts = -1;
return w;
}
/***********************************************************************
* Close
***********************************************************************
*
**********************************************************************/
static void Close( hb_work_object_t ** _w )
{
hb_work_object_t * w = *_w;
free( w->name );
free( w );
*_w = NULL;
}
/***********************************************************************
* Encode
***********************************************************************
*
**********************************************************************/
static hb_buffer_t * Encode( hb_work_object_t * w )
{
hb_buffer_t * buf;
int16_t samples_s16[1152 * 2];
uint64_t pts;
int pos, i;
if( hb_list_bytes( w->list ) < w->input_samples * sizeof( float ) )
{
return NULL;
}
hb_list_getbytes( w->list, w->buf, w->input_samples * sizeof( float ),
&pts, &pos);
for( i = 0; i < 1152 * 2; i++ )
{
samples_s16[i] = ((float*) w->buf)[i];
}
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,
1152, buf->data, LAME_MAXMP3BUFFER );
buf->key = 1;
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
***********************************************************************
*
**********************************************************************/
static int Work( hb_work_object_t * w, hb_buffer_t ** buf_in,
hb_buffer_t ** buf_out )
{
hb_buffer_t * buf;
hb_list_add( w->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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