1 /*
2 * export_ac3.c
3 *
4 * Copyright (C) Daniel Pittman, 2003, based on export_ogg.c which was:
5 * Copyright (C) Tilmann Bitterberg, July 2002
6 *
7 * This file is part of transcode, a video stream processing tool
8 *
9 * transcode is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
12 * any later version.
13 *
14 * transcode is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with GNU Make; see the file COPYING. If not, write to
21 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
22 *
23 */
24
25 #define MOD_NAME "export_ac3.so"
26 #define MOD_VERSION "v0.1 (2003-02-26)"
27 #define MOD_CODEC "(video) null | (audio) ac3"
28
29 #include "transcode.h"
30
31 #include <stdio.h>
32 #include <unistd.h>
33
34 static int verbose_flag=TC_QUIET;
35 static int capability_flag=TC_CAP_PCM;
36
37 #define MOD_PRE ac3
38 #include "export_def.h"
39 static FILE *pFile = NULL;
40
p_write(char * buf,size_t len)41 static inline int p_write (char *buf, size_t len)
42 {
43 size_t n = 0;
44 size_t r = 0;
45 int fd = fileno (pFile);
46
47 while (r < len)
48 {
49 if ((n = write (fd, buf + r, len - r)) < 0)
50 return n;
51
52 r += n;
53 }
54
55 return r;
56 }
57
58 /* ------------------------------------------------------------
59 *
60 * open codec
61 *
62 * ------------------------------------------------------------*/
63
64 MOD_open
65 {
66 int result;
67
68 /* check for ffmpeg */
69 if (tc_test_program("ffmpeg") != 0) return (TC_EXPORT_ERROR);
70
71 if (param->flag == TC_AUDIO) {
72 char buf [PATH_MAX];
73
74 if (vob->mp3bitrate == 0) {
75 tc_log_warn (MOD_NAME, "Please set the export audio bitrate");
76 return(TC_EXPORT_ERROR);
77 }
78
79 if (vob->mp3frequency == 0) {
80 tc_log_warn (MOD_NAME, "Please set the export audio sample rate");
81 return(TC_EXPORT_ERROR);
82 }
83
84 tc_log_warn(MOD_NAME, "*** This module is non-optimal ***");
85 tc_log_warn(MOD_NAME, "*** Use -N 0x2000 instead of -y ...,ac3 (faster) ***");
86
87 result = tc_snprintf (buf, PATH_MAX,
88 "ffmpeg -y -f s%dle -ac %d -ar %d -i - -ab %dk -acodec ac3 %s%s",
89 vob->dm_bits,
90 vob->dm_chan,
91 vob->mp3frequency,
92 vob->mp3bitrate,
93 vob->audio_out_file,
94 vob->verbose > 1 ? "" : " >/dev/null 2>&1");
95
96 if (result < 0)
97 return(TC_EXPORT_ERROR);
98
99 if (verbose > 0)
100 tc_log_info(MOD_NAME, "%s", buf);
101
102 if ((pFile = popen (buf, "w")) == NULL)
103 return(TC_EXPORT_ERROR);
104
105 return(TC_EXPORT_OK);
106
107 }
108 if (param->flag == TC_VIDEO)
109 return(TC_EXPORT_OK);
110
111 // invalid flag
112 return(TC_EXPORT_ERROR);
113 }
114
115 /* ------------------------------------------------------------
116 *
117 * init codec
118 *
119 * ------------------------------------------------------------*/
120
121 MOD_init
122 {
123 if(param->flag == TC_AUDIO)
124 {
125 return(0);
126 }
127
128 if (param->flag == TC_VIDEO)
129 return(0);
130
131 // invalid flag
132 return(TC_EXPORT_ERROR);
133 }
134
135
136 /* ------------------------------------------------------------
137 *
138 * encode and export
139 *
140 * ------------------------------------------------------------*/
141
142 MOD_encode
143 {
144 if(param->flag == TC_AUDIO)
145 {
146 if (p_write (param->buffer, param->size) != param->size)
147 {
148 tc_log_perror(MOD_NAME, "write audio frame");
149 return(TC_EXPORT_ERROR);
150 }
151 return (0);
152 }
153
154 if (param->flag == TC_VIDEO)
155 return(0);
156
157 // invalid flag
158 return(TC_EXPORT_ERROR);
159 }
160
161
162 /* ------------------------------------------------------------
163 *
164 * stop codec
165 *
166 * ------------------------------------------------------------*/
167
168 MOD_stop
169 {
170 if (param->flag == TC_VIDEO)
171 return (0);
172
173 if (param->flag == TC_AUDIO)
174 return (0);
175
176 return(TC_EXPORT_ERROR);
177 }
178
179
180 /* ------------------------------------------------------------
181 *
182 * close codec
183 *
184 * ------------------------------------------------------------*/
185
186 MOD_close
187 {
188 if (param->flag == TC_VIDEO)
189 return (0);
190
191 if (param->flag == TC_AUDIO)
192 {
193 if (pFile)
194 pclose (pFile);
195
196 pFile = NULL;
197
198 return(0);
199 }
200
201 return (TC_EXPORT_ERROR);
202 }
203
204 /* vim: sw=4
205 */
206