FFmpeg
wc3movie.c
Go to the documentation of this file.
1 /*
2  * Wing Commander III Movie (.mve) File Demuxer
3  * Copyright (c) 2003 The FFmpeg project
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Wing Commander III Movie file demuxer
25  * by Mike Melanson (melanson@pcisys.net)
26  * for more information on the WC3 .mve file format, visit:
27  * http://www.pcisys.net/~melanson/codecs/
28  */
29 
30 #include "libavutil/avstring.h"
31 #include "libavutil/channel_layout.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/dict.h"
34 #include "avformat.h"
35 #include "internal.h"
36 
37 #define FORM_TAG MKTAG('F', 'O', 'R', 'M')
38 #define MOVE_TAG MKTAG('M', 'O', 'V', 'E')
39 #define PC__TAG MKTAG('_', 'P', 'C', '_')
40 #define SOND_TAG MKTAG('S', 'O', 'N', 'D')
41 #define BNAM_TAG MKTAG('B', 'N', 'A', 'M')
42 #define SIZE_TAG MKTAG('S', 'I', 'Z', 'E')
43 #define PALT_TAG MKTAG('P', 'A', 'L', 'T')
44 #define INDX_TAG MKTAG('I', 'N', 'D', 'X')
45 #define BRCH_TAG MKTAG('B', 'R', 'C', 'H')
46 #define SHOT_TAG MKTAG('S', 'H', 'O', 'T')
47 #define VGA__TAG MKTAG('V', 'G', 'A', ' ')
48 #define TEXT_TAG MKTAG('T', 'E', 'X', 'T')
49 #define AUDI_TAG MKTAG('A', 'U', 'D', 'I')
50 
51 /* video resolution unless otherwise specified */
52 #define WC3_DEFAULT_WIDTH 320
53 #define WC3_DEFAULT_HEIGHT 165
54 
55 /* always use the same PCM audio parameters */
56 #define WC3_SAMPLE_RATE 22050
57 #define WC3_AUDIO_CHANNELS 1
58 #define WC3_AUDIO_BITS 16
59 
60 /* nice, constant framerate */
61 #define WC3_FRAME_FPS 15
62 
63 #define PALETTE_SIZE (256 * 3)
64 
65 typedef struct Wc3DemuxContext {
66  int width;
67  int height;
68  int64_t pts;
69  int video_stream_index;
70  int audio_stream_index;
71 
72  AVPacket *vpkt;
73 
74 } Wc3DemuxContext;
75 
76 static int wc3_read_close(AVFormatContext *s)
77 {
78  Wc3DemuxContext *wc3 = s->priv_data;
79 
80  av_packet_free(&wc3->vpkt);
81 
82  return 0;
83 }
84 
85 static int wc3_probe(const AVProbeData *p)
86 {
87  if (p->buf_size < 12)
88  return 0;
89 
90  if ((AV_RL32(&p->buf[0]) != FORM_TAG) ||
91  (AV_RL32(&p->buf[8]) != MOVE_TAG))
92  return 0;
93 
94  return AVPROBE_SCORE_MAX;
95 }
96 
97 static int wc3_read_header(AVFormatContext *s)
98 {
99  Wc3DemuxContext *wc3 = s->priv_data;
100  AVIOContext *pb = s->pb;
101  unsigned int fourcc_tag;
102  unsigned int size;
103  AVStream *st;
104  int ret = 0;
105  char *buffer;
106 
107  /* default context members */
108  wc3->width = WC3_DEFAULT_WIDTH;
109  wc3->height = WC3_DEFAULT_HEIGHT;
110  wc3->pts = 0;
111  wc3->video_stream_index = wc3->audio_stream_index = 0;
112  wc3->vpkt = av_packet_alloc();
113  if (!wc3->vpkt)
114  return AVERROR(ENOMEM);
115 
116  /* skip the first 3 32-bit numbers */
117  avio_skip(pb, 12);
118 
119  /* traverse through the chunks and load the header information before
120  * the first BRCH tag */
121  fourcc_tag = avio_rl32(pb);
122  size = (avio_rb32(pb) + 1) & (~1);
123 
124  do {
125  switch (fourcc_tag) {
126 
127  case SOND_TAG:
128  case INDX_TAG:
129  /* SOND unknown, INDX unnecessary; ignore both */
130  avio_skip(pb, size);
131  break;
132 
133  case PC__TAG:
134  /* number of palettes, unneeded */
135  avio_skip(pb, 12);
136  break;
137 
138  case BNAM_TAG:
139  /* load up the name */
140  buffer = av_malloc(size+1);
141  if (!buffer)
142  return AVERROR(ENOMEM);
143  if ((ret = avio_read(pb, buffer, size)) != size) {
144  av_freep(&buffer);
145  return AVERROR(EIO);
146  }
147  buffer[size] = 0;
148  av_dict_set(&s->metadata, "title", buffer,
149  AV_DICT_DONT_STRDUP_VAL);
150  break;
151 
152  case SIZE_TAG:
153  /* video resolution override */
154  wc3->width = avio_rl32(pb);
155  wc3->height = avio_rl32(pb);
156  break;
157 
158  case PALT_TAG:
159  /* one of several palettes */
160  avio_seek(pb, -8, SEEK_CUR);
161  av_append_packet(pb, wc3->vpkt, 8 + PALETTE_SIZE);
162  break;
163 
164  default:
165  av_log(s, AV_LOG_ERROR, "unrecognized WC3 chunk: %s\n",
166  av_fourcc2str(fourcc_tag));
167  return AVERROR_INVALIDDATA;
168  }
169 
170  fourcc_tag = avio_rl32(pb);
171  /* chunk sizes are 16-bit aligned */
172  size = (avio_rb32(pb) + 1) & (~1);
173  if (avio_feof(pb))
174  return AVERROR(EIO);
175 
176  } while (fourcc_tag != BRCH_TAG);
177 
178  /* initialize the decoder streams */
179  st = avformat_new_stream(s, NULL);
180  if (!st)
181  return AVERROR(ENOMEM);
182  avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS);
183  wc3->video_stream_index = st->index;
184  st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
185  st->codecpar->codec_id = AV_CODEC_ID_XAN_WC3;
186  st->codecpar->codec_tag = 0; /* no fourcc */
187  st->codecpar->width = wc3->width;
188  st->codecpar->height = wc3->height;
189 
190  st = avformat_new_stream(s, NULL);
191  if (!st)
192  return AVERROR(ENOMEM);
193  avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS);
194  wc3->audio_stream_index = st->index;
195  st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
196  st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
197  st->codecpar->codec_tag = 1;
198  st->codecpar->channels = WC3_AUDIO_CHANNELS;
199  st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
200  st->codecpar->bits_per_coded_sample = WC3_AUDIO_BITS;
201  st->codecpar->sample_rate = WC3_SAMPLE_RATE;
202  st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate *
203  st->codecpar->bits_per_coded_sample;
204  st->codecpar->block_align = WC3_AUDIO_BITS * WC3_AUDIO_CHANNELS;
205 
206  return 0;
207 }
208 
209 static int wc3_read_packet(AVFormatContext *s,
210  AVPacket *pkt)
211 {
212  Wc3DemuxContext *wc3 = s->priv_data;
213  AVIOContext *pb = s->pb;
214  unsigned int fourcc_tag;
215  unsigned int size;
216  int packet_read = 0;
217  int ret = 0;
218  unsigned char text[1024];
219 
220  while (!packet_read) {
221 
222  fourcc_tag = avio_rl32(pb);
223  /* chunk sizes are 16-bit aligned */
224  size = (avio_rb32(pb) + 1) & (~1);
225  if (avio_feof(pb))
226  return AVERROR(EIO);
227 
228  switch (fourcc_tag) {
229 
230  case BRCH_TAG:
231  /* no-op */
232  break;
233 
234  case SHOT_TAG:
235  /* load up new palette */
236  avio_seek(pb, -8, SEEK_CUR);
237  av_append_packet(pb, wc3->vpkt, 8 + 4);
238  break;
239 
240  case VGA__TAG:
241  /* send out video chunk */
242  avio_seek(pb, -8, SEEK_CUR);
243  ret= av_append_packet(pb, wc3->vpkt, 8 + size);
244  // ignore error if we have some data
245  if (wc3->vpkt->size > 0)
246  ret = 0;
247  av_packet_move_ref(pkt, wc3->vpkt);
248  pkt->stream_index = wc3->video_stream_index;
249  pkt->pts = wc3->pts;
250  packet_read = 1;
251  break;
252 
253  case TEXT_TAG:
254  /* subtitle chunk */
255  if ((unsigned)size > sizeof(text) || (ret = avio_read(pb, text, size)) != size)
256  ret = AVERROR(EIO);
257  else {
258  int i = 0;
259  av_log (s, AV_LOG_DEBUG, "Subtitle time!\n");
260  if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)
261  return AVERROR_INVALIDDATA;
262  av_log (s, AV_LOG_DEBUG, " inglish: %s\n", &text[i + 1]);
263  i += text[i] + 1;
264  if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)
265  return AVERROR_INVALIDDATA;
266  av_log (s, AV_LOG_DEBUG, " doytsch: %s\n", &text[i + 1]);
267  i += text[i] + 1;
268  if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)
269  return AVERROR_INVALIDDATA;
270  av_log (s, AV_LOG_DEBUG, " fronsay: %s\n", &text[i + 1]);
271  }
272  break;
273 
274  case AUDI_TAG:
275  /* send out audio chunk */
276  ret= av_get_packet(pb, pkt, size);
277  pkt->stream_index = wc3->audio_stream_index;
278  pkt->pts = wc3->pts;
279 
280  /* time to advance pts */
281  wc3->pts++;
282 
283  packet_read = 1;
284  break;
285 
286  default:
287  av_log(s, AV_LOG_ERROR, "unrecognized WC3 chunk: %s\n",
288  av_fourcc2str(fourcc_tag));
289  ret = AVERROR_INVALIDDATA;
290  packet_read = 1;
291  break;
292  }
293  }
294 
295  return ret;
296 }
297 
298 const AVInputFormat ff_wc3_demuxer = {
299  .name = "wc3movie",
300  .long_name = NULL_IF_CONFIG_SMALL("Wing Commander III movie"),
301  .priv_data_size = sizeof(Wc3DemuxContext),
302  .flags_internal = FF_FMT_INIT_CLEANUP,
303  .read_probe = wc3_probe,
304  .read_header = wc3_read_header,
305  .read_packet = wc3_read_packet,
306  .read_close = wc3_read_close,
307 };
Wc3DemuxContext::audio_stream_index
int audio_stream_index
Definition: wc3movie.c:70
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:314
FF_FMT_INIT_CLEANUP
#define FF_FMT_INIT_CLEANUP
For an AVInputFormat with this flag set read_close() needs to be called by the caller upon read_heade...
Definition: internal.h:49
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:768
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_MONO
Definition: channel_layout.h:90
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
AVProbeData::buf_size
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:450
FORM_TAG
#define FORM_TAG
Definition: wc3movie.c:37
av_packet_free
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:75
PC__TAG
#define PC__TAG
Definition: wc3movie.c:39
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
Wc3DemuxContext::pts
int64_t pts
Definition: wc3movie.c:68
Wc3DemuxContext
Definition: wc3movie.c:65
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:459
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
WC3_SAMPLE_RATE
#define WC3_SAMPLE_RATE
Definition: wc3movie.c:56
AUDI_TAG
#define AUDI_TAG
Definition: wc3movie.c:49
wc3_read_header
static int wc3_read_header(AVFormatContext *s)
Definition: wc3movie.c:97
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:141
AV_DICT_DONT_STRDUP_VAL
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that's been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:72
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:790
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
AVInputFormat
Definition: avformat.h:650
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:655
TEXT_TAG
#define TEXT_TAG
Definition: wc3movie.c:48
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:449
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:126
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
AVFormatContext
Format I/O context.
Definition: avformat.h:1200
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1095
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
SOND_TAG
#define SOND_TAG
Definition: wc3movie.c:40
NULL
#define NULL
Definition: coverity.c:32
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
av_strnlen
size_t static size_t av_strnlen(const char *s, size_t len)
Get the count of continuous non zero chars starting from the beginning.
Definition: avstring.h:141
VGA__TAG
#define VGA__TAG
Definition: wc3movie.c:47
WC3_AUDIO_CHANNELS
#define WC3_AUDIO_CHANNELS
Definition: wc3movie.c:57
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:447
MOVE_TAG
#define MOVE_TAG
Definition: wc3movie.c:38
av_packet_move_ref
void av_packet_move_ref(AVPacket *dst, AVPacket *src)
Move every field in src to dst and reset src.
Definition: avpacket.c:481
WC3_DEFAULT_HEIGHT
#define WC3_DEFAULT_HEIGHT
Definition: wc3movie.c:53
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
ff_wc3_demuxer
const AVInputFormat ff_wc3_demuxer
Definition: wc3movie.c:298
BRCH_TAG
#define BRCH_TAG
Definition: wc3movie.c:45
SHOT_TAG
#define SHOT_TAG
Definition: wc3movie.c:46
BNAM_TAG
#define BNAM_TAG
Definition: wc3movie.c:41
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:759
Wc3DemuxContext::vpkt
AVPacket * vpkt
Definition: wc3movie.c:72
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
AVPacket::size
int size
Definition: packet.h:374
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
size
int size
Definition: twinvq_data.h:10344
av_packet_alloc
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: avpacket.c:64
WC3_AUDIO_BITS
#define WC3_AUDIO_BITS
Definition: wc3movie.c:58
AV_CODEC_ID_XAN_WC3
@ AV_CODEC_ID_XAN_WC3
Definition: codec_id.h:90
wc3_probe
static int wc3_probe(const AVProbeData *p)
Definition: wc3movie.c:85
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:366
AVCodecParameters::height
int height
Definition: codec_par.h:127
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:177
wc3_read_packet
static int wc3_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: wc3movie.c:209
wc3_read_close
static int wc3_read_close(AVFormatContext *s)
Definition: wc3movie.c:76
Wc3DemuxContext::width
int width
Definition: wc3movie.c:66
av_get_packet
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:197
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:935
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:260
av_append_packet
int av_append_packet(AVIOContext *s, AVPacket *pkt, int size)
Read data and append it to the current content of the AVPacket.
Definition: utils.c:213
avformat.h
dict.h
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AVStream::index
int index
stream index in AVFormatContext
Definition: avformat.h:943
channel_layout.h
PALETTE_SIZE
#define PALETTE_SIZE
Definition: wc3movie.c:63
SIZE_TAG
#define SIZE_TAG
Definition: wc3movie.c:42
buffer
the frame and frame reference mechanism is intended to as much as expensive copies of that data while still allowing the filters to produce correct results The data is stored in buffers represented by AVFrame structures Several references can point to the same frame buffer
Definition: filter_design.txt:49
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:641
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:1196
AVPacket::stream_index
int stream_index
Definition: packet.h:375
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:347
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
PALT_TAG
#define PALT_TAG
Definition: wc3movie.c:43
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:350
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
av_dict_set
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
AVCodecParameters::channel_layout
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
INDX_TAG
#define INDX_TAG
Definition: wc3movie.c:44
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
Wc3DemuxContext::video_stream_index
int video_stream_index
Definition: wc3movie.c:69
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
Wc3DemuxContext::height
int height
Definition: wc3movie.c:67
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
WC3_DEFAULT_WIDTH
#define WC3_DEFAULT_WIDTH
Definition: wc3movie.c:52
avstring.h
WC3_FRAME_FPS
#define WC3_FRAME_FPS
Definition: wc3movie.c:61
av_fourcc2str
#define av_fourcc2str(fourcc)
Definition: avutil.h:348
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:375
Generated on Wed Aug 24 2022 21:38:28 for FFmpeg by   doxygen 1.8.17