FFmpeg
wc3movie.c
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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"
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;
71 
73 
75 
76 static int wc3_probe(const AVProbeData *p)
77 {
78  if (p->buf_size < 12)
79  return 0;
80 
81  if ((AV_RL32(&p->buf[0]) != FORM_TAG) ||
82  (AV_RL32(&p->buf[8]) != MOVE_TAG))
83  return 0;
84 
85  return AVPROBE_SCORE_MAX;
86 }
87 
89 {
90  Wc3DemuxContext *wc3 = s->priv_data;
91  AVIOContext *pb = s->pb;
92  unsigned int fourcc_tag;
93  unsigned int size;
94  AVStream *st;
95  int ret = 0;
96  char *buffer;
97 
98  /* default context members */
99  wc3->width = WC3_DEFAULT_WIDTH;
100  wc3->height = WC3_DEFAULT_HEIGHT;
101  wc3->pts = 0;
102  wc3->video_stream_index = wc3->audio_stream_index = 0;
103  av_init_packet(&wc3->vpkt);
104  wc3->vpkt.data = NULL; wc3->vpkt.size = 0;
105 
106  /* skip the first 3 32-bit numbers */
107  avio_skip(pb, 12);
108 
109  /* traverse through the chunks and load the header information before
110  * the first BRCH tag */
111  fourcc_tag = avio_rl32(pb);
112  size = (avio_rb32(pb) + 1) & (~1);
113 
114  do {
115  switch (fourcc_tag) {
116 
117  case SOND_TAG:
118  case INDX_TAG:
119  /* SOND unknown, INDX unnecessary; ignore both */
120  avio_skip(pb, size);
121  break;
122 
123  case PC__TAG:
124  /* number of palettes, unneeded */
125  avio_skip(pb, 12);
126  break;
127 
128  case BNAM_TAG:
129  /* load up the name */
130  buffer = av_malloc(size+1);
131  if (!buffer)
132  return AVERROR(ENOMEM);
133  if ((ret = avio_read(pb, buffer, size)) != size) {
134  av_freep(&buffer);
135  return AVERROR(EIO);
136  }
137  buffer[size] = 0;
138  av_dict_set(&s->metadata, "title", buffer,
140  break;
141 
142  case SIZE_TAG:
143  /* video resolution override */
144  wc3->width = avio_rl32(pb);
145  wc3->height = avio_rl32(pb);
146  break;
147 
148  case PALT_TAG:
149  /* one of several palettes */
150  avio_seek(pb, -8, SEEK_CUR);
151  av_append_packet(pb, &wc3->vpkt, 8 + PALETTE_SIZE);
152  break;
153 
154  default:
155  av_log(s, AV_LOG_ERROR, "unrecognized WC3 chunk: %s\n",
156  av_fourcc2str(fourcc_tag));
157  return AVERROR_INVALIDDATA;
158  }
159 
160  fourcc_tag = avio_rl32(pb);
161  /* chunk sizes are 16-bit aligned */
162  size = (avio_rb32(pb) + 1) & (~1);
163  if (avio_feof(pb))
164  return AVERROR(EIO);
165 
166  } while (fourcc_tag != BRCH_TAG);
167 
168  /* initialize the decoder streams */
169  st = avformat_new_stream(s, NULL);
170  if (!st)
171  return AVERROR(ENOMEM);
173  wc3->video_stream_index = st->index;
176  st->codecpar->codec_tag = 0; /* no fourcc */
177  st->codecpar->width = wc3->width;
178  st->codecpar->height = wc3->height;
179 
180  st = avformat_new_stream(s, NULL);
181  if (!st)
182  return AVERROR(ENOMEM);
184  wc3->audio_stream_index = st->index;
187  st->codecpar->codec_tag = 1;
195 
196  return 0;
197 }
198 
200  AVPacket *pkt)
201 {
202  Wc3DemuxContext *wc3 = s->priv_data;
203  AVIOContext *pb = s->pb;
204  unsigned int fourcc_tag;
205  unsigned int size;
206  int packet_read = 0;
207  int ret = 0;
208  unsigned char text[1024];
209 
210  while (!packet_read) {
211 
212  fourcc_tag = avio_rl32(pb);
213  /* chunk sizes are 16-bit aligned */
214  size = (avio_rb32(pb) + 1) & (~1);
215  if (avio_feof(pb))
216  return AVERROR(EIO);
217 
218  switch (fourcc_tag) {
219 
220  case BRCH_TAG:
221  /* no-op */
222  break;
223 
224  case SHOT_TAG:
225  /* load up new palette */
226  avio_seek(pb, -8, SEEK_CUR);
227  av_append_packet(pb, &wc3->vpkt, 8 + 4);
228  break;
229 
230  case VGA__TAG:
231  /* send out video chunk */
232  avio_seek(pb, -8, SEEK_CUR);
233  ret= av_append_packet(pb, &wc3->vpkt, 8 + size);
234  // ignore error if we have some data
235  if (wc3->vpkt.size > 0)
236  ret = 0;
237  *pkt = wc3->vpkt;
238  wc3->vpkt.data = NULL; wc3->vpkt.size = 0;
239  pkt->stream_index = wc3->video_stream_index;
240  pkt->pts = wc3->pts;
241  packet_read = 1;
242  break;
243 
244  case TEXT_TAG:
245  /* subtitle chunk */
246  if ((unsigned)size > sizeof(text) || (ret = avio_read(pb, text, size)) != size)
247  ret = AVERROR(EIO);
248  else {
249  int i = 0;
250  av_log (s, AV_LOG_DEBUG, "Subtitle time!\n");
251  if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)
252  return AVERROR_INVALIDDATA;
253  av_log (s, AV_LOG_DEBUG, " inglish: %s\n", &text[i + 1]);
254  i += text[i] + 1;
255  if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)
256  return AVERROR_INVALIDDATA;
257  av_log (s, AV_LOG_DEBUG, " doytsch: %s\n", &text[i + 1]);
258  i += text[i] + 1;
259  if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)
260  return AVERROR_INVALIDDATA;
261  av_log (s, AV_LOG_DEBUG, " fronsay: %s\n", &text[i + 1]);
262  }
263  break;
264 
265  case AUDI_TAG:
266  /* send out audio chunk */
267  ret= av_get_packet(pb, pkt, size);
268  pkt->stream_index = wc3->audio_stream_index;
269  pkt->pts = wc3->pts;
270 
271  /* time to advance pts */
272  wc3->pts++;
273 
274  packet_read = 1;
275  break;
276 
277  default:
278  av_log(s, AV_LOG_ERROR, "unrecognized WC3 chunk: %s\n",
279  av_fourcc2str(fourcc_tag));
280  ret = AVERROR_INVALIDDATA;
281  packet_read = 1;
282  break;
283  }
284  }
285 
286  return ret;
287 }
288 
290 {
291  Wc3DemuxContext *wc3 = s->priv_data;
292 
293  if (wc3->vpkt.size > 0)
294  av_packet_unref(&wc3->vpkt);
295 
296  return 0;
297 }
298 
300  .name = "wc3movie",
301  .long_name = NULL_IF_CONFIG_SMALL("Wing Commander III movie"),
302  .priv_data_size = sizeof(Wc3DemuxContext),
307 };
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define WC3_AUDIO_BITS
Definition: wc3movie.c:58
#define BRCH_TAG
Definition: wc3movie.c:45
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:140
void avpriv_set_pts_info(AVStream *s, 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:4929
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3968
int index
stream index in AVFormatContext
Definition: avformat.h:882
int size
Definition: avcodec.h:1481
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
#define SIZE_TAG
Definition: wc3movie.c:42
#define WC3_DEFAULT_HEIGHT
Definition: wc3movie.c:53
#define INDX_TAG
Definition: wc3movie.c:44
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:334
static AVPacket pkt
int video_stream_index
Definition: wc3movie.c:69
Format I/O context.
Definition: avformat.h:1358
Public dictionary API.
int64_t pts
Definition: wc3movie.c:68
#define SHOT_TAG
Definition: wc3movie.c:46
#define TEXT_TAG
Definition: wc3movie.c:48
#define SOND_TAG
Definition: wc3movie.c:40
#define av_malloc(s)
int width
Video only.
Definition: avcodec.h:4034
static int wc3_read_close(AVFormatContext *s)
Definition: wc3movie.c:289
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:803
AVInputFormat ff_wc3_demuxer
Definition: wc3movie.c:299
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4502
uint8_t * data
Definition: avcodec.h:1480
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
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:310
ptrdiff_t size
Definition: opengl_enc.c:100
#define BNAM_TAG
Definition: wc3movie.c:41
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4070
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:650
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:320
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3997
#define PALT_TAG
Definition: wc3movie.c:43
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1598
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:772
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
#define AUDI_TAG
Definition: wc3movie.c:49
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
#define av_fourcc2str(fourcc)
Definition: avutil.h:348
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3964
#define WC3_DEFAULT_WIDTH
Definition: wc3movie.c:52
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:449
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
int block_align
Audio only.
Definition: avcodec.h:4085
audio channel layout utility functions
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that&#39;s been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:76
#define s(width, name)
Definition: cbs_vp9.c:257
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:881
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
int audio_stream_index
Definition: wc3movie.c:70
#define PALETTE_SIZE
Definition: wc3movie.c:63
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:599
#define PC__TAG
Definition: wc3movie.c:39
static int wc3_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: wc3movie.c:199
#define WC3_FRAME_FPS
Definition: wc3movie.c:61
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
#define FORM_TAG
Definition: wc3movie.c:37
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
#define WC3_AUDIO_CHANNELS
Definition: wc3movie.c:57
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int sample_rate
Audio only.
Definition: avcodec.h:4078
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
Main libavformat public API header.
#define WC3_SAMPLE_RATE
Definition: wc3movie.c:56
static int wc3_read_header(AVFormatContext *s)
Definition: wc3movie.c:88
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:33
AVPacket vpkt
Definition: wc3movie.c:72
void * priv_data
Format private data.
Definition: avformat.h:1386
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4010
int channels
Audio only.
Definition: avcodec.h:4074
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:361
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3972
#define VGA__TAG
Definition: wc3movie.c:47
static int wc3_probe(const AVProbeData *p)
Definition: wc3movie.c:76
int stream_index
Definition: avcodec.h:1482
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
#define AV_CH_LAYOUT_MONO
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1457
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1473
GLuint buffer
Definition: opengl_enc.c:101
#define MOVE_TAG
Definition: wc3movie.c:38