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/* $Id: Resample.c,v 1.4 2004/05/02 16:25:00 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 "HBInternal.h"
#include "samplerate.h"
struct HBWork
{
HB_WORK_COMMON_MEMBERS
HBHandle * handle;
HBAudio * audio;
float * samples;
SRC_STATE * state;
SRC_DATA data;
uint64_t in;
uint64_t out;
};
/* Local prototypes */
static int ResampleWork( HBWork * );
HBWork * HBResampleInit( HBHandle * handle, HBAudio * audio )
{
HBWork * w;
if( !( w = calloc( sizeof( HBWork ), 1 ) ) )
{
HBLog( "HBResampleInit: malloc() failed, gonna crash" );
return NULL;
}
w->name = strdup( "Resample" );
w->work = ResampleWork;
w->handle = handle;
w->audio = audio;
return w;
}
void HBResampleClose( HBWork ** _w )
{
HBWork * w = *_w;
if( w->samples ) free( w->samples );
if( w->state ) src_delete( w->state );
free( w->name );
free( w );
*_w = NULL;
}
static int ResampleWork( HBWork * w )
{
HBAudio * audio = w->audio;
HBBuffer * resampleBuffer;
float position;
if( HBFifoIsHalfFull( audio->resampleFifo ) )
{
return 0;
}
/* Initialization */
if( !w->samples )
{
int error;
/* Until a first packet comes, audio->inSampleRate is
undefined */
if( !HBFifoSize( audio->rawFifo ) )
{
return 0;
}
/* No, the user can't choose. 44100 Hz, take it or leave it */
audio->outSampleRate = 44100;
HBLog( "HBResample: in = %d Hz, out = %d Hz",
audio->inSampleRate, audio->outSampleRate );
/* Buffer in which we'll pop the samples from the decoder */
w->samples = malloc( audio->inSampleRate * 2 *
sizeof( float ) / 10 );
/* Init libsamplerate */
w->state = src_new( SRC_SINC_FASTEST, 2, &error );
/* Prepare the SRC_DATA structure */
w->data.data_in = w->samples;
w->data.input_frames = audio->inSampleRate / 10;
w->data.output_frames = audio->outSampleRate / 10;
w->data.src_ratio = (double) audio->outSampleRate /
(double) audio->inSampleRate;
w->data.end_of_input = 0;
}
/* Fix A/V synchro in case the audio track starts later than the
video */
if( audio->delay > 0 )
{
HBLog( "HBResample: adding %d ms of silence", audio->delay );
resampleBuffer = HBBufferInit( audio->delay *
audio->outSampleRate * 2 * sizeof( float ) / 1000 );
memset( resampleBuffer->data, 0, resampleBuffer->size );
if( !HBFifoPush( audio->resampleFifo, &resampleBuffer ) )
{
HBLog( "HBResample: HBFifoPush failed" );
}
audio->delay = 0;
return 1;
}
/* Get samples from the decoder */
if( !HBFifoGetBytes( audio->rawFifo, (uint8_t *) w->samples,
audio->inSampleRate * 2 * sizeof( float ) / 10,
&position ) )
{
return 0;
}
/* Init resampled buffer */
resampleBuffer = HBBufferInit( audio->outSampleRate * 2 *
sizeof( float ) / 10 );
resampleBuffer->position = position;
/* Resample */
w->data.data_out = resampleBuffer->dataf;
if( src_process( w->state, &w->data ) )
{
HBLog( "HBResample: src_process failed" );
}
resampleBuffer->size = w->data.output_frames_gen * 2 *
sizeof( float );
if( w->data.input_frames_used != w->data.input_frames )
{
/* Here we're basically f*cked */
HBLog( "HBResample: ohoh, %d/%d used",
w->data.input_frames_used, w->data.input_frames );
}
/* Send resampled data to the encoder */
if( !HBFifoPush( audio->resampleFifo, &resampleBuffer ) )
{
HBLog( "HBResample: HBFifoPush failed" );
}
return 1;
}
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