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/*
* aud_scan_avi.c
*
* Scans the audio track - AVI specific functions
*
* Copyright (C) Tilmann Bitterberg - June 2003
*
* This file is part of transcode, a video stream processing tool
*
* transcode is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* transcode is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Make; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "aud_scan_avi.h"
#include "aud_scan.h"
// ------------------------
// You must set the requested audio before entering this function
// the AVI file out must be filled with correct values.
// ------------------------
int sync_audio_video_avi2avi (double vid_ms, double *aud_ms, avi_t *in, avi_t *out)
{
static char *data = NULL;
int vbr = AVI_get_audio_vbr(out);
int mp3rate = AVI_audio_mp3rate(out);
int format = AVI_audio_format(out);
int chan = AVI_audio_channels(out);
long rate = AVI_audio_rate(out);
int bits = AVI_audio_bits(out);
long bytes = 0;
bits = (bits == 0)?16:bits;
if (!data) data = malloc(48000*16*4);
if (!data) fprintf (stderr, "Malloc failed at %s:%d\n", __FILE__, __LINE__);
if (format == 0x1) {
mp3rate = rate*chan*bits;
} else {
mp3rate *= 1000;
}
if (tc_format_ms_supported(format)) {
while (*aud_ms < vid_ms) {
if( (bytes = AVI_read_audio_chunk(in, data)) < 0) {
AVI_print_error("AVI audio read frame");
//*aud_ms = vid_ms;
return(-2);
}
//fprintf(stderr, "len (%ld)\n", bytes);
if(AVI_write_audio(out, data, bytes)<0) {
AVI_print_error("AVI write audio frame");
return(-1);
}
// pass-through null frames
if (bytes == 0) {
*aud_ms = vid_ms;
break;
}
if ( vbr && tc_get_audio_header(data, bytes, format, NULL, NULL, &mp3rate)<0) {
// if this is the last frame of the file, slurp in audio chunks
//if (n == frames-1) continue;
*aud_ms = vid_ms;
} else {
if (vbr) mp3rate *= 1000;
*aud_ms += (bytes*8.0*1000.0)/(double)mp3rate;
}
/*
fprintf(stderr, "%s track (%d) %8.0lf->%8.0lf len (%ld) rate (%ld)\n",
format==0x55?"MP3":format==0x1?"PCM":"AC3",
j, vid_ms, aud_ms[j], bytes, mp3rate);
*/
}
} else { // fallback for not supported audio format
do {
if ( (bytes = AVI_read_audio_chunk(in, data) ) < 0) {
AVI_print_error("AVI audio read frame");
return -2;
}
if(AVI_write_audio(out, data, bytes)<0) {
AVI_print_error("AVI write audio frame");
return(-1);
}
} while (AVI_can_read_audio(in));
}
return 0;
}
int sync_audio_video_avi2avi_ro (double vid_ms, double *aud_ms, avi_t *in)
{
static char *data = NULL;
int vbr = AVI_get_audio_vbr(in);
int mp3rate = AVI_audio_mp3rate(in);
int format = AVI_audio_format(in);
int chan = AVI_audio_channels(in);
long rate = AVI_audio_rate(in);
int bits = AVI_audio_bits(in);
long bytes = 0;
bits = (bits == 0)?16:bits;
if (!data) data = malloc(48000*16*4);
if (!data) fprintf (stderr, "Malloc failed at %s:%d\n", __FILE__, __LINE__);
if (format == 0x1) {
mp3rate = rate*chan*bits;
} else {
mp3rate *= 1000;
}
if (tc_format_ms_supported(format)) {
while (*aud_ms < vid_ms) {
if( (bytes = AVI_read_audio_chunk(in, data)) < 0) {
AVI_print_error("AVI audio read frame");
//*aud_ms = vid_ms;
return(-2);
}
//fprintf(stderr, "len (%ld)\n", bytes);
// pass-through null frames
if (bytes == 0) {
*aud_ms = vid_ms;
break;
}
if ( vbr && tc_get_audio_header(data, bytes, format, NULL, NULL, &mp3rate)<0) {
// if this is the last frame of the file, slurp in audio chunks
//if (n == frames-1) continue;
*aud_ms = vid_ms;
} else {
if (vbr) mp3rate *= 1000;
*aud_ms += (bytes*8.0*1000.0)/(double)mp3rate;
}
/*
fprintf(stderr, "%s track (%d) %8.0lf->%8.0lf len (%ld) rate (%ld)\n",
format==0x55?"MP3":format==0x1?"PCM":"AC3",
j, vid_ms, aud_ms[j], bytes, mp3rate);
*/
}
} else { // fallback for not supported audio format
do {
if ( (bytes = AVI_read_audio_chunk(in, data) ) < 0) {
AVI_print_error("AVI audio read frame");
return -2;
}
} while (AVI_can_read_audio(in));
}
return 0;
}
/*************************************************************************/
/*
* Local variables:
* c-file-style: "stroustrup"
* c-file-offsets: ((case-label . *) (statement-case-intro . *))
* indent-tabs-mode: nil
* End:
*
* vim: expandtab shiftwidth=4:
*/
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