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259 lines
6.3 KiB
259 lines
6.3 KiB
/*
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* export_mp2.c
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*
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* Copyright (C) Simone Karin Lehmann, June 2004, based on export_ac3 by Daniel Pittman
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* Copyright (C) Daniel Pittman, 2003, based on export_ogg.c which was:
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* Copyright (C) Tilmann Bitterberg, July 2002
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*
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* This file is part of transcode, a video stream processing tool
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*
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* transcode is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* transcode is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Make; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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/* Usage:
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This module processes audio streams only. There are no compile time depencies.
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At run time, sox and ffmpeg must be present.
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This module lets you encode audio to MPEG 1 Layer 2 audio aka mp2. It uses the
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ffmpeg encoder and therefor it's very fast. Just do
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-y <video_module>,mp2
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Additionaly this module can change the speed of the audio stream by a factor the
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user can specify. You need sox do do this. Use the module the follwing way
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-y <video_module>,mp2=speed=N
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where N is an unsigned float. N < 1.0 will slow down audio (meaning playing time will
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increase) whereas N > 1.0 will speed up audio (meaning playing time will decrease)
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The pitch of the audio is not corrected. E.g. to speed up audio by 25/23.976 (this
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is used to convert NTSC film material to PAL) use
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-y <video_module>,mp2=speed=1.0427093
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*/
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#define MOD_NAME "export_mp2.so"
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#define MOD_VERSION "v0.2.1 (2004-08-06)"
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#define MOD_CODEC "(audio) MPEG 1/2"
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#include "transcode.h"
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#include "libtc/optstr.h"
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#include <stdio.h>
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#include <unistd.h>
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static int verbose_flag=TC_QUIET;
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static int capability_flag=TC_CAP_PCM;
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#define MOD_PRE mp2
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#include "export_def.h"
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static FILE *pFile = NULL;
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static double speed = 0.0;
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static inline int p_write (char *buf, size_t len)
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{
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size_t n = 0;
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size_t r = 0;
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int fd = fileno (pFile);
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while (r < len)
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{
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if ((n = write (fd, buf + r, len - r)) < 0)
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return n;
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r += n;
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}
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return r;
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}
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/* ------------------------------------------------------------
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*
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* open codec
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*
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* ------------------------------------------------------------*/
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MOD_open
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{
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int result, srate;
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/* check for ffmpeg */
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if (tc_test_program("ffmpeg") != 0) return (TC_EXPORT_ERROR);
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if (param->flag == TC_AUDIO) {
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char buf [PATH_MAX];
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char out_fname [PATH_MAX];
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char *ptr = buf;
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strlcpy(out_fname, vob->audio_out_file, sizeof(out_fname));
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if (strcmp(vob->audio_out_file, vob->video_out_file) == 0)
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strlcat(out_fname, ".mpa", sizeof(out_fname));
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if (vob->mp3bitrate == 0) {
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tc_log_warn (MOD_NAME, "Audio bitrate 0 is not valid, cannot cope.");
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return(TC_EXPORT_ERROR);
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}
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srate = (vob->mp3frequency != 0) ? vob->mp3frequency : vob->a_rate;
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// need sox for speed changing?
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if (speed > 0.0) {
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/* check for sox */
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if (tc_test_program("sox") != 0) return (TC_EXPORT_ERROR);
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result = tc_snprintf(buf, PATH_MAX,
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"sox %s -s -c %d -r %d -t raw - -r %d -t wav - speed %.10f | ",
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vob->dm_bits == 16 ? "-w" : "-b",
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vob->dm_chan,
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vob->a_rate,
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vob->a_rate,
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speed);
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if (result < 0)
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return(TC_EXPORT_ERROR);
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ptr = buf + strlen(buf);
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}
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result = tc_snprintf (ptr, PATH_MAX - strlen(buf),
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"ffmpeg -y -f s%d%s -ac %d -ar %d -i - -ab %dk -ar %d -f mp2 %s%s",
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vob->dm_bits,
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((vob->dm_bits > 8) ? "le" : ""),
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vob->dm_chan,
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vob->a_rate,
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vob->mp3bitrate,
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srate,
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out_fname,
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vob->verbose > 1 ? "" : " >/dev/null 2>&1");
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if (result < 0)
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return(TC_EXPORT_ERROR);
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if (verbose > 0)
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tc_log_info (MOD_NAME, "%s", buf);
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if ((pFile = popen (buf, "w")) == NULL)
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return(TC_EXPORT_ERROR);
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return(0);
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}
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if (param->flag == TC_VIDEO)
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return(0);
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// invalid flag
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return(TC_EXPORT_ERROR);
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}
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/* ------------------------------------------------------------
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*
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* init codec
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*
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* ------------------------------------------------------------*/
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MOD_init
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{
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if(param->flag == TC_AUDIO)
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{
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if (vob->ex_a_string) {
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optstr_get(vob->ex_a_string, "speed", "%lf", &speed);
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}
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return(0);
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}
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if (param->flag == TC_VIDEO)
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return(0);
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// invalid flag
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return(TC_EXPORT_ERROR);
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}
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/* ------------------------------------------------------------
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*
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* encode and export
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*
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* ------------------------------------------------------------*/
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MOD_encode
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{
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if(param->flag == TC_AUDIO)
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{
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if (p_write (param->buffer, param->size) != param->size)
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{
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tc_log_perror(MOD_NAME, "write audio frame");
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return(TC_EXPORT_ERROR);
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}
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return (0);
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}
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if (param->flag == TC_VIDEO)
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return(0);
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// invalid flag
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return(TC_EXPORT_ERROR);
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}
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/* ------------------------------------------------------------
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*
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* stop codec
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*
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* ------------------------------------------------------------*/
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MOD_stop
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{
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if (param->flag == TC_VIDEO)
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return (0);
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if (param->flag == TC_AUDIO)
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return (0);
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return(TC_EXPORT_ERROR);
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}
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/* ------------------------------------------------------------
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*
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* close codec
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*
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* ------------------------------------------------------------*/
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MOD_close
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{
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if (param->flag == TC_VIDEO)
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return (0);
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if (param->flag == TC_AUDIO)
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{
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if (pFile)
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pclose (pFile);
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pFile = NULL;
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return(0);
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}
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return (TC_EXPORT_ERROR);
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}
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/* vim: sw=4
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*/
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