FFmpeg: libavdevice/libcdio.c Source File

FFmpeg
libcdio.c
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1 /*
2  * Copyright (c) 2011 Anton Khirnov <anton@khirnov.net>
3  *
4  * This file is part of Libav.
5  *
6  * Libav is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * Libav is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * libcdio CD grabbing
24  */
25 
26 #include "config.h"
27 
28 #if HAVE_CDIO_PARANOIA_H
29 #include <cdio/cdda.h>
30 #include <cdio/paranoia.h>
31 #elif HAVE_CDIO_PARANOIA_PARANOIA_H
32 #include <cdio/paranoia/cdda.h>
33 #include <cdio/paranoia/paranoia.h>
34 #endif
35 
36 #include "libavutil/log.h"
37 #include "libavutil/mem.h"
38 #include "libavutil/opt.h"
39 
40 #include "libavformat/avformat.h"
41 #include "libavformat/internal.h"
42 
43  typedef struct CDIOContext {
44   const AVClass *class;
45   cdrom_drive_t *drive;
46   cdrom_paranoia_t *paranoia;
47   int32_t last_sector;
48 
49  /* private options */
50   int speed;
51   int paranoia_mode;
52 } CDIOContext;
53 
54  static av_cold int read_header(AVFormatContext *ctx)
55 {
56  CDIOContext *s = ctx->priv_data;
57  AVStream *st;
58  int ret, i;
59  char *err = NULL;
60 
61  if (!(st = avformat_new_stream(ctx, NULL)))
62  return AVERROR(ENOMEM);
63  s->drive = cdio_cddap_identify(ctx->filename, CDDA_MESSAGE_LOGIT, &err);
64  if (!s->drive) {
65  av_log(ctx, AV_LOG_ERROR, "Could not open drive %s.\n", ctx->filename);
66  return AVERROR(EINVAL);
67  }
68  if (err) {
69  av_log(ctx, AV_LOG_VERBOSE, "%s\n", err);
70  free(err);
71  }
72  if ((ret = cdio_cddap_open(s->drive)) < 0 || !s->drive->opened) {
73  av_log(ctx, AV_LOG_ERROR, "Could not open disk in drive %s.\n", ctx->filename);
74  return AVERROR(EINVAL);
75  }
76 
77  cdio_cddap_verbose_set(s->drive, CDDA_MESSAGE_LOGIT, CDDA_MESSAGE_LOGIT);
78  if (s->speed)
79  cdio_cddap_speed_set(s->drive, s->speed);
80 
81  s->paranoia = cdio_paranoia_init(s->drive);
82  if (!s->paranoia) {
83  av_log(ctx, AV_LOG_ERROR, "Could not init paranoia.\n");
84  return AVERROR(EINVAL);
85  }
86  cdio_paranoia_modeset(s->paranoia, s->paranoia_mode);
87 
88  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
89  if (s->drive->bigendianp)
90  st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
91  else
92  st->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
93  st->codec->sample_rate = 44100;
94  st->codec->channels = 2;
95  if (s->drive->audio_last_sector != CDIO_INVALID_LSN &&
96  s->drive->audio_first_sector != CDIO_INVALID_LSN)
97  st->duration = s->drive->audio_last_sector - s->drive->audio_first_sector;
98  else if (s->drive->tracks)
99  st->duration = s->drive->disc_toc[s->drive->tracks].dwStartSector;
100  avpriv_set_pts_info(st, 64, CDIO_CD_FRAMESIZE_RAW, 2*st->codec->channels*st->codec->sample_rate);
101 
102  for (i = 0; i < s->drive->tracks; i++) {
103  char title[16];
104  snprintf(title, sizeof(title), "track %02d", s->drive->disc_toc[i].bTrack);
105  avpriv_new_chapter(ctx, i, st->time_base, s->drive->disc_toc[i].dwStartSector,
106  s->drive->disc_toc[i+1].dwStartSector, title);
107  }
108 
109  s->last_sector = cdio_cddap_disc_lastsector(s->drive);
110 
111  return 0;
112 }
113 
114  static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
115 {
116  CDIOContext *s = ctx->priv_data;
117  int ret;
118  uint16_t *buf;
119  char *err = NULL;
120 
121  if (ctx->streams[0]->cur_dts > s->last_sector)
122  return AVERROR_EOF;
123 
124  buf = cdio_paranoia_read(s->paranoia, NULL);
125  if (!buf)
126  return AVERROR_EOF;
127 
128  if (err = cdio_cddap_errors(s->drive)) {
129  av_log(ctx, AV_LOG_ERROR, "%s\n", err);
130  free(err);
131  err = NULL;
132  }
133  if (err = cdio_cddap_messages(s->drive)) {
134  av_log(ctx, AV_LOG_VERBOSE, "%s\n", err);
135  free(err);
136  err = NULL;
137  }
138 
139  if ((ret = av_new_packet(pkt, CDIO_CD_FRAMESIZE_RAW)) < 0)
140  return ret;
141  memcpy(pkt->data, buf, CDIO_CD_FRAMESIZE_RAW);
142  return 0;
143 }
144 
145  static av_cold int read_close(AVFormatContext *ctx)
146 {
147  CDIOContext *s = ctx->priv_data;
148  cdio_paranoia_free(s->paranoia);
149  cdio_cddap_close(s->drive);
150  return 0;
151 }
152 
153  static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp,
154  int flags)
155 {
156  CDIOContext *s = ctx->priv_data;
157  AVStream *st = ctx->streams[0];
158 
159  cdio_paranoia_seek(s->paranoia, timestamp, SEEK_SET);
160  st->cur_dts = timestamp;
161  return 0;
162 }
163 
164  #define OFFSET(x) offsetof(CDIOContext, x)
165  #define DEC AV_OPT_FLAG_DECODING_PARAM
166  static const AVOption options[] = {
167  { "speed", "Drive reading speed.", OFFSET(speed), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, DEC },
168  { "paranoia_mode", "Error recovery mode.", OFFSET(paranoia_mode), AV_OPT_TYPE_FLAGS, { .i64 = 0 }, INT_MIN, INT_MAX, DEC, "paranoia_mode" },
169  { "verify", "Verify data integrity in overlap area", 0, AV_OPT_TYPE_CONST, { .i64 = PARANOIA_MODE_VERIFY }, 0, 0, DEC, "paranoia_mode" },
170  { "overlap", "Perform overlapped reads.", 0, AV_OPT_TYPE_CONST, { .i64 = PARANOIA_MODE_OVERLAP }, 0, 0, DEC, "paranoia_mode" },
171  { "neverskip", "Do not skip failed reads.", 0, AV_OPT_TYPE_CONST, { .i64 = PARANOIA_MODE_NEVERSKIP }, 0, 0, DEC, "paranoia_mode" },
172  { NULL },
173 };
174 
175  static const AVClass libcdio_class = {
176  .class_name = "libcdio indev",
177  .item_name = av_default_item_name,
178  .option = options,
179  .version = LIBAVUTIL_VERSION_INT,
180 };
181 
182  AVInputFormat ff_libcdio_demuxer = {
183  .name = "libcdio",
184  .read_header = read_header,
185  .read_packet = read_packet,
186  .read_close = read_close,
187  .read_seek = read_seek,
188  .priv_data_size = sizeof(CDIOContext),
189  .flags = AVFMT_NOFILE,
190  .priv_class = &libcdio_class,
191 };
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