FFmpeg  4.1.11
rpl.c
Go to the documentation of this file.
1 /*
2  * ARMovie/RPL demuxer
3  * Copyright (c) 2007 Christian Ohm, 2008 Eli Friedman
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 #include <inttypes.h>
23 #include <stdlib.h>
24 
25 #include "libavutil/avstring.h"
26 #include "libavutil/dict.h"
27 #include "avformat.h"
28 #include "internal.h"
29 
30 #define RPL_SIGNATURE "ARMovie\x0A"
31 #define RPL_SIGNATURE_SIZE 8
32 
33 /** 256 is arbitrary, but should be big enough for any reasonable file. */
34 #define RPL_LINE_LENGTH 256
35 
36 static int rpl_probe(AVProbeData *p)
37 {
38  if (memcmp(p->buf, RPL_SIGNATURE, RPL_SIGNATURE_SIZE))
39  return 0;
40 
41  return AVPROBE_SCORE_MAX;
42 }
43 
44 typedef struct RPLContext {
45  // RPL header data
47 
48  // Stream position data
49  uint32_t chunk_number;
50  uint32_t chunk_part;
51  uint32_t frame_in_part;
52 } RPLContext;
53 
54 static int read_line(AVIOContext * pb, char* line, int bufsize)
55 {
56  int i;
57  for (i = 0; i < bufsize - 1; i++) {
58  int b = avio_r8(pb);
59  if (b == 0)
60  break;
61  if (b == '\n') {
62  line[i] = '\0';
63  return avio_feof(pb) ? -1 : 0;
64  }
65  line[i] = b;
66  }
67  line[i] = '\0';
68  return -1;
69 }
70 
71 static int32_t read_int(const char* line, const char** endptr, int* error)
72 {
73  unsigned long result = 0;
74  for (; *line>='0' && *line<='9'; line++) {
75  if (result > (0x7FFFFFFF - 9) / 10)
76  *error = -1;
77  result = 10 * result + *line - '0';
78  }
79  *endptr = line;
80  return result;
81 }
82 
84 {
85  char line[RPL_LINE_LENGTH];
86  const char *endptr;
87  *error |= read_line(pb, line, sizeof(line));
88  return read_int(line, &endptr, error);
89 }
90 
91 /** Parsing for fps, which can be a fraction. Unfortunately,
92  * the spec for the header leaves out a lot of details,
93  * so this is mostly guessing.
94  */
95 static AVRational read_fps(const char* line, int* error)
96 {
97  int64_t num, den = 1;
98  AVRational result;
99  num = read_int(line, &line, error);
100  if (*line == '.')
101  line++;
102  for (; *line>='0' && *line<='9'; line++) {
103  // Truncate any numerator too large to fit into an int64_t
104  if (num > (INT64_MAX - 9) / 10 || den > INT64_MAX / 10)
105  break;
106  num = 10 * num + (*line - '0');
107  den *= 10;
108  }
109  if (!num)
110  *error = -1;
111  av_reduce(&result.num, &result.den, num, den, 0x7FFFFFFF);
112  return result;
113 }
114 
116 {
117  AVIOContext *pb = s->pb;
118  RPLContext *rpl = s->priv_data;
119  AVStream *vst = NULL, *ast = NULL;
120  int total_audio_size;
121  int error = 0;
122  const char *endptr;
123  char audio_type[RPL_LINE_LENGTH];
124 
125  uint32_t i;
126 
127  int32_t audio_format, chunk_catalog_offset, number_of_chunks;
128  AVRational fps;
129 
130  char line[RPL_LINE_LENGTH];
131 
132  // The header for RPL/ARMovie files is 21 lines of text
133  // containing the various header fields. The fields are always
134  // in the same order, and other text besides the first
135  // number usually isn't important.
136  // (The spec says that there exists some significance
137  // for the text in a few cases; samples needed.)
138  error |= read_line(pb, line, sizeof(line)); // ARMovie
139  error |= read_line(pb, line, sizeof(line)); // movie name
140  av_dict_set(&s->metadata, "title" , line, 0);
141  error |= read_line(pb, line, sizeof(line)); // date/copyright
142  av_dict_set(&s->metadata, "copyright", line, 0);
143  error |= read_line(pb, line, sizeof(line)); // author and other
144  av_dict_set(&s->metadata, "author" , line, 0);
145 
146  // video headers
147  vst = avformat_new_stream(s, NULL);
148  if (!vst)
149  return AVERROR(ENOMEM);
151  vst->codecpar->codec_tag = read_line_and_int(pb, &error); // video format
152  vst->codecpar->width = read_line_and_int(pb, &error); // video width
153  vst->codecpar->height = read_line_and_int(pb, &error); // video height
154  vst->codecpar->bits_per_coded_sample = read_line_and_int(pb, &error); // video bits per sample
155  error |= read_line(pb, line, sizeof(line)); // video frames per second
156  fps = read_fps(line, &error);
157  avpriv_set_pts_info(vst, 32, fps.den, fps.num);
158 
159  // Figure out the video codec
160  switch (vst->codecpar->codec_tag) {
161 #if 0
162  case 122:
163  vst->codecpar->codec_id = AV_CODEC_ID_ESCAPE122;
164  break;
165 #endif
166  case 124:
168  // The header is wrong here, at least sometimes
169  vst->codecpar->bits_per_coded_sample = 16;
170  break;
171  case 130:
173  break;
174  default:
175  avpriv_report_missing_feature(s, "Video format %s",
178  }
179 
180  // Audio headers
181 
182  // ARMovie supports multiple audio tracks; I don't have any
183  // samples, though. This code will ignore additional tracks.
184  audio_format = read_line_and_int(pb, &error); // audio format ID
185  if (audio_format) {
186  ast = avformat_new_stream(s, NULL);
187  if (!ast)
188  return AVERROR(ENOMEM);
189  ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
190  ast->codecpar->codec_tag = audio_format;
191  ast->codecpar->sample_rate = read_line_and_int(pb, &error); // audio bitrate
192  ast->codecpar->channels = read_line_and_int(pb, &error); // number of audio channels
193  error |= read_line(pb, line, sizeof(line));
194  ast->codecpar->bits_per_coded_sample = read_int(line, &endptr, &error); // audio bits per sample
195  av_strlcpy(audio_type, endptr, RPL_LINE_LENGTH);
196  // At least one sample uses 0 for ADPCM, which is really 4 bits
197  // per sample.
198  if (ast->codecpar->bits_per_coded_sample == 0)
199  ast->codecpar->bits_per_coded_sample = 4;
200 
201  ast->codecpar->bit_rate = ast->codecpar->sample_rate *
202  (int64_t)ast->codecpar->channels;
203  if (ast->codecpar->bit_rate > INT64_MAX / ast->codecpar->bits_per_coded_sample)
204  return AVERROR_INVALIDDATA;
205  ast->codecpar->bit_rate *= ast->codecpar->bits_per_coded_sample;
206 
207  ast->codecpar->codec_id = AV_CODEC_ID_NONE;
208  switch (audio_format) {
209  case 1:
210  if (ast->codecpar->bits_per_coded_sample == 16) {
211  // 16-bit audio is always signed
212  ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
213  break;
214  } else if (ast->codecpar->bits_per_coded_sample == 8) {
215  if(strstr(audio_type, "unsigned") != NULL) {
216  ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
217  break;
218  } else if(strstr(audio_type, "linear") != NULL) {
219  ast->codecpar->codec_id = AV_CODEC_ID_PCM_S8;
220  break;
221  } else {
222  ast->codecpar->codec_id = AV_CODEC_ID_PCM_VIDC;
223  break;
224  }
225  }
226  // There are some other formats listed as legal per the spec;
227  // samples needed.
228  break;
229  case 101:
230  if (ast->codecpar->bits_per_coded_sample == 8) {
231  // The samples with this kind of audio that I have
232  // are all unsigned.
233  ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
234  break;
235  } else if (ast->codecpar->bits_per_coded_sample == 4) {
236  ast->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_EA_SEAD;
237  break;
238  }
239  break;
240  }
241  if (ast->codecpar->codec_id == AV_CODEC_ID_NONE)
242  avpriv_request_sample(s, "Audio format %"PRId32,
243  audio_format);
244  avpriv_set_pts_info(ast, 32, 1, ast->codecpar->bit_rate);
245  } else {
246  for (i = 0; i < 3; i++)
247  error |= read_line(pb, line, sizeof(line));
248  }
249 
250  if (s->nb_streams == 0)
251  return AVERROR_INVALIDDATA;
252 
253  rpl->frames_per_chunk = read_line_and_int(pb, &error); // video frames per chunk
254  if (rpl->frames_per_chunk > 1 && vst->codecpar->codec_tag != 124)
256  "Don't know how to split frames for video format %s. "
257  "Video stream will be broken!\n", av_fourcc2str(vst->codecpar->codec_tag));
258 
259  number_of_chunks = read_line_and_int(pb, &error); // number of chunks in the file
260  // The number in the header is actually the index of the last chunk.
261  number_of_chunks++;
262 
263  error |= read_line(pb, line, sizeof(line)); // "even" chunk size in bytes
264  error |= read_line(pb, line, sizeof(line)); // "odd" chunk size in bytes
265  chunk_catalog_offset = // offset of the "chunk catalog"
266  read_line_and_int(pb, &error); // (file index)
267  error |= read_line(pb, line, sizeof(line)); // offset to "helpful" sprite
268  error |= read_line(pb, line, sizeof(line)); // size of "helpful" sprite
269  error |= read_line(pb, line, sizeof(line)); // offset to key frame list
270 
271  // Read the index
272  avio_seek(pb, chunk_catalog_offset, SEEK_SET);
273  total_audio_size = 0;
274  for (i = 0; !error && i < number_of_chunks; i++) {
275  int64_t offset, video_size, audio_size;
276  error |= read_line(pb, line, sizeof(line));
277  if (3 != sscanf(line, "%"SCNd64" , %"SCNd64" ; %"SCNd64,
278  &offset, &video_size, &audio_size)) {
279  error = -1;
280  continue;
281  }
282  av_add_index_entry(vst, offset, i * rpl->frames_per_chunk,
283  video_size, rpl->frames_per_chunk, 0);
284  if (ast)
285  av_add_index_entry(ast, offset + video_size, total_audio_size,
286  audio_size, audio_size * 8, 0);
287  total_audio_size += audio_size * 8;
288  }
289 
290  if (error) return AVERROR(EIO);
291 
292  return 0;
293 }
294 
296 {
297  RPLContext *rpl = s->priv_data;
298  AVIOContext *pb = s->pb;
299  AVStream* stream;
300  AVIndexEntry* index_entry;
301  int ret;
302 
303  if (rpl->chunk_part == s->nb_streams) {
304  rpl->chunk_number++;
305  rpl->chunk_part = 0;
306  }
307 
308  stream = s->streams[rpl->chunk_part];
309 
310  if (rpl->chunk_number >= stream->nb_index_entries)
311  return AVERROR_EOF;
312 
313  index_entry = &stream->index_entries[rpl->chunk_number];
314 
315  if (rpl->frame_in_part == 0)
316  if (avio_seek(pb, index_entry->pos, SEEK_SET) < 0)
317  return AVERROR(EIO);
318 
319  if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
320  stream->codecpar->codec_tag == 124) {
321  // We have to split Escape 124 frames because there are
322  // multiple frames per chunk in Escape 124 samples.
323  uint32_t frame_size;
324 
325  avio_skip(pb, 4); /* flags */
326  frame_size = avio_rl32(pb);
327  if (avio_feof(pb) || avio_seek(pb, -8, SEEK_CUR) < 0 || !frame_size)
328  return AVERROR(EIO);
329 
330  ret = av_get_packet(pb, pkt, frame_size);
331  if (ret < 0)
332  return ret;
333  if (ret != frame_size) {
334  av_packet_unref(pkt);
335  return AVERROR(EIO);
336  }
337  pkt->duration = 1;
338  pkt->pts = index_entry->timestamp + rpl->frame_in_part;
339  pkt->stream_index = rpl->chunk_part;
340 
341  rpl->frame_in_part++;
342  if (rpl->frame_in_part == rpl->frames_per_chunk) {
343  rpl->frame_in_part = 0;
344  rpl->chunk_part++;
345  }
346  } else {
347  ret = av_get_packet(pb, pkt, index_entry->size);
348  if (ret < 0)
349  return ret;
350  if (ret != index_entry->size) {
351  av_packet_unref(pkt);
352  return AVERROR(EIO);
353  }
354 
355  if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
356  // frames_per_chunk should always be one here; the header
357  // parsing will warn if it isn't.
358  pkt->duration = rpl->frames_per_chunk;
359  } else {
360  // All the audio codecs supported in this container
361  // (at least so far) are constant-bitrate.
362  pkt->duration = ret * 8;
363  }
364  pkt->pts = index_entry->timestamp;
365  pkt->stream_index = rpl->chunk_part;
366  rpl->chunk_part++;
367  }
368 
369  // None of the Escape formats have keyframes, and the ADPCM
370  // format used doesn't have keyframes.
371  if (rpl->chunk_number == 0 && rpl->frame_in_part == 0)
372  pkt->flags |= AV_PKT_FLAG_KEY;
373 
374  return ret;
375 }
376 
378  .name = "rpl",
379  .long_name = NULL_IF_CONFIG_SMALL("RPL / ARMovie"),
380  .priv_data_size = sizeof(RPLContext),
384 };
#define NULL
Definition: coverity.c:32
static AVRational read_fps(const char *line, int *error)
Parsing for fps, which can be a fraction.
Definition: rpl.c:95
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:2048
Definition: rpl.c:44
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
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:4899
int64_t pos
Definition: avformat.h:803
#define avpriv_request_sample(...)
static int read_line(AVIOContext *pb, char *line, int bufsize)
Definition: rpl.c:54
uint32_t frame_in_part
Definition: rpl.c:51
uint32_t chunk_part
Definition: rpl.c:50
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3900
int num
Numerator.
Definition: rational.h:59
const char * b
Definition: vf_curves.c:116
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1103
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:331
static AVPacket pkt
int32_t frames_per_chunk
Definition: rpl.c:46
Format I/O context.
Definition: avformat.h:1351
Public dictionary API.
int width
Video only.
Definition: avcodec.h:3966
uint32_t chunk_number
Definition: rpl.c:49
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1463
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4469
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
#define AVERROR_EOF
End of file.
Definition: error.h:55
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:313
int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max)
Reduce a fraction.
Definition: rational.c:35
#define av_log(a,...)
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1477
static int rpl_read_header(AVFormatContext *s)
Definition: rpl.c:115
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:258
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1591
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:769
#define AVERROR(e)
Definition: error.h:43
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:804
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
#define av_fourcc2str(fourcc)
Definition: avutil.h:348
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3896
Definition: graph2dot.c:48
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
Definition: avstring.c:83
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1451
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:638
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1407
static int rpl_probe(AVProbeData *p)
Definition: rpl.c:36
static int32_t read_int(const char *line, const char **endptr, int *error)
Definition: rpl.c:71
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
int32_t
#define s(width, name)
Definition: cbs_vp9.c:257
AVInputFormat ff_rpl_demuxer
Definition: rpl.c:377
if(ret< 0)
Definition: vf_mcdeint.c:279
static void error(const char *err)
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:548
Stream structure.
Definition: avformat.h:874
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
int frame_size
Definition: mxfenc.c:2091
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:598
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
int nb_index_entries
Definition: avformat.h:1105
Rational number (pair of numerator and denominator).
Definition: rational.h:58
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
static int32_t read_line_and_int(AVIOContext *pb, int *error)
Definition: rpl.c:83
#define RPL_SIGNATURE
Definition: rpl.c:30
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
Main libavformat public API header.
static int rpl_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rpl.c:295
int den
Denominator.
Definition: rational.h:60
void * priv_data
Format private data.
Definition: avformat.h:1379
#define RPL_LINE_LENGTH
256 is arbitrary, but should be big enough for any reasonable file.
Definition: rpl.c:34
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:3942
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:647
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1021
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:358
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3904
int stream_index
Definition: avcodec.h:1447
This structure stores compressed data.
Definition: avcodec.h:1422
#define RPL_SIGNATURE_SIZE
Definition: rpl.c:31
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1438