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
rpl_probe(const AVProbeData * p)36 static int rpl_probe(const 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
46 int32_t frames_per_chunk;
47
48 // Stream position data
49 uint32_t chunk_number;
50 uint32_t chunk_part;
51 uint32_t frame_in_part;
52 } RPLContext;
53
read_line(AVIOContext * pb,char * line,int bufsize)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
read_int(const char * line,const char ** endptr,int * error)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
read_line_and_int(AVIOContext * pb,int * error)83 static int32_t read_line_and_int(AVIOContext * pb, int* error)
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 */
read_fps(const char * line,int * error)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
rpl_read_header(AVFormatContext * s)115 static int rpl_read_header(AVFormatContext *s)
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 video_format, 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 video_format = read_line_and_int(pb, &error);
148 if (video_format) {
149 vst = avformat_new_stream(s, NULL);
150 if (!vst)
151 return AVERROR(ENOMEM);
152 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
153 vst->codecpar->codec_tag = video_format;
154 vst->codecpar->width = read_line_and_int(pb, &error); // video width
155 vst->codecpar->height = read_line_and_int(pb, &error); // video height
156 vst->codecpar->bits_per_coded_sample = read_line_and_int(pb, &error); // video bits per sample
157
158 // Figure out the video codec
159 switch (vst->codecpar->codec_tag) {
160 #if 0
161 case 122:
162 vst->codecpar->codec_id = AV_CODEC_ID_ESCAPE122;
163 break;
164 #endif
165 case 124:
166 vst->codecpar->codec_id = AV_CODEC_ID_ESCAPE124;
167 // The header is wrong here, at least sometimes
168 vst->codecpar->bits_per_coded_sample = 16;
169 break;
170 case 130:
171 vst->codecpar->codec_id = AV_CODEC_ID_ESCAPE130;
172 break;
173 default:
174 avpriv_report_missing_feature(s, "Video format %s",
175 av_fourcc2str(vst->codecpar->codec_tag));
176 vst->codecpar->codec_id = AV_CODEC_ID_NONE;
177 }
178 } else {
179 for (i = 0; i < 3; i++)
180 error |= read_line(pb, line, sizeof(line));
181 }
182
183 error |= read_line(pb, line, sizeof(line)); // video frames per second
184 fps = read_fps(line, &error);
185 if (vst)
186 avpriv_set_pts_info(vst, 32, fps.den, fps.num);
187
188 // Audio headers
189
190 // ARMovie supports multiple audio tracks; I don't have any
191 // samples, though. This code will ignore additional tracks.
192 audio_format = read_line_and_int(pb, &error); // audio format ID
193 if (audio_format) {
194 ast = avformat_new_stream(s, NULL);
195 if (!ast)
196 return AVERROR(ENOMEM);
197 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
198 ast->codecpar->codec_tag = audio_format;
199 ast->codecpar->sample_rate = read_line_and_int(pb, &error); // audio bitrate
200 ast->codecpar->channels = read_line_and_int(pb, &error); // number of audio channels
201 error |= read_line(pb, line, sizeof(line));
202 ast->codecpar->bits_per_coded_sample = read_int(line, &endptr, &error); // audio bits per sample
203 av_strlcpy(audio_type, endptr, RPL_LINE_LENGTH);
204 // At least one sample uses 0 for ADPCM, which is really 4 bits
205 // per sample.
206 if (ast->codecpar->bits_per_coded_sample == 0)
207 ast->codecpar->bits_per_coded_sample = 4;
208
209 ast->codecpar->bit_rate = ast->codecpar->sample_rate *
210 ast->codecpar->bits_per_coded_sample *
211 ast->codecpar->channels;
212
213 ast->codecpar->codec_id = AV_CODEC_ID_NONE;
214 switch (audio_format) {
215 case 1:
216 if (ast->codecpar->bits_per_coded_sample == 16) {
217 // 16-bit audio is always signed
218 ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
219 break;
220 } else if (ast->codecpar->bits_per_coded_sample == 8) {
221 if(av_stristr(audio_type, "unsigned") != NULL) {
222 ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
223 break;
224 } else if(av_stristr(audio_type, "linear") != NULL) {
225 ast->codecpar->codec_id = AV_CODEC_ID_PCM_S8;
226 break;
227 } else {
228 ast->codecpar->codec_id = AV_CODEC_ID_PCM_VIDC;
229 break;
230 }
231 }
232 // There are some other formats listed as legal per the spec;
233 // samples needed.
234 break;
235 case 101:
236 if (ast->codecpar->bits_per_coded_sample == 8) {
237 // The samples with this kind of audio that I have
238 // are all unsigned.
239 ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
240 break;
241 } else if (ast->codecpar->bits_per_coded_sample == 4) {
242 ast->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_EA_SEAD;
243 break;
244 }
245 break;
246 }
247 if (ast->codecpar->codec_id == AV_CODEC_ID_NONE)
248 avpriv_request_sample(s, "Audio format %"PRId32,
249 audio_format);
250 avpriv_set_pts_info(ast, 32, 1, ast->codecpar->bit_rate);
251 } else {
252 for (i = 0; i < 3; i++)
253 error |= read_line(pb, line, sizeof(line));
254 }
255
256 if (s->nb_streams == 0)
257 return AVERROR_INVALIDDATA;
258
259 rpl->frames_per_chunk = read_line_and_int(pb, &error); // video frames per chunk
260 if (vst && rpl->frames_per_chunk > 1 && vst->codecpar->codec_tag != 124)
261 av_log(s, AV_LOG_WARNING,
262 "Don't know how to split frames for video format %s. "
263 "Video stream will be broken!\n", av_fourcc2str(vst->codecpar->codec_tag));
264
265 number_of_chunks = read_line_and_int(pb, &error); // number of chunks in the file
266 // The number in the header is actually the index of the last chunk.
267 number_of_chunks++;
268
269 error |= read_line(pb, line, sizeof(line)); // "even" chunk size in bytes
270 error |= read_line(pb, line, sizeof(line)); // "odd" chunk size in bytes
271 chunk_catalog_offset = // offset of the "chunk catalog"
272 read_line_and_int(pb, &error); // (file index)
273 error |= read_line(pb, line, sizeof(line)); // offset to "helpful" sprite
274 error |= read_line(pb, line, sizeof(line)); // size of "helpful" sprite
275 if (vst) {
276 error |= read_line(pb, line, sizeof(line)); // offset to key frame list
277 vst->duration = number_of_chunks * rpl->frames_per_chunk;
278 }
279
280 // Read the index
281 avio_seek(pb, chunk_catalog_offset, SEEK_SET);
282 total_audio_size = 0;
283 for (i = 0; !error && i < number_of_chunks; i++) {
284 int64_t offset, video_size, audio_size;
285 error |= read_line(pb, line, sizeof(line));
286 if (3 != sscanf(line, "%"SCNd64" , %"SCNd64" ; %"SCNd64,
287 &offset, &video_size, &audio_size)) {
288 error = -1;
289 continue;
290 }
291 if (vst)
292 av_add_index_entry(vst, offset, i * rpl->frames_per_chunk,
293 video_size, rpl->frames_per_chunk, 0);
294 if (ast)
295 av_add_index_entry(ast, offset + video_size, total_audio_size,
296 audio_size, audio_size * 8, 0);
297 total_audio_size += audio_size * 8;
298 }
299
300 if (error) return AVERROR(EIO);
301
302 return 0;
303 }
304
rpl_read_packet(AVFormatContext * s,AVPacket * pkt)305 static int rpl_read_packet(AVFormatContext *s, AVPacket *pkt)
306 {
307 RPLContext *rpl = s->priv_data;
308 AVIOContext *pb = s->pb;
309 AVStream* stream;
310 AVIndexEntry* index_entry;
311 int ret;
312
313 if (rpl->chunk_part == s->nb_streams) {
314 rpl->chunk_number++;
315 rpl->chunk_part = 0;
316 }
317
318 stream = s->streams[rpl->chunk_part];
319
320 if (rpl->chunk_number >= stream->nb_index_entries)
321 return AVERROR_EOF;
322
323 index_entry = &stream->index_entries[rpl->chunk_number];
324
325 if (rpl->frame_in_part == 0)
326 if (avio_seek(pb, index_entry->pos, SEEK_SET) < 0)
327 return AVERROR(EIO);
328
329 if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
330 stream->codecpar->codec_tag == 124) {
331 // We have to split Escape 124 frames because there are
332 // multiple frames per chunk in Escape 124 samples.
333 uint32_t frame_size;
334
335 avio_skip(pb, 4); /* flags */
336 frame_size = avio_rl32(pb);
337 if (avio_seek(pb, -8, SEEK_CUR) < 0)
338 return AVERROR(EIO);
339
340 ret = av_get_packet(pb, pkt, frame_size);
341 if (ret < 0)
342 return ret;
343 if (ret != frame_size) {
344 return AVERROR(EIO);
345 }
346 pkt->duration = 1;
347 pkt->pts = index_entry->timestamp + rpl->frame_in_part;
348 pkt->stream_index = rpl->chunk_part;
349
350 rpl->frame_in_part++;
351 if (rpl->frame_in_part == rpl->frames_per_chunk) {
352 rpl->frame_in_part = 0;
353 rpl->chunk_part++;
354 }
355 } else {
356 ret = av_get_packet(pb, pkt, index_entry->size);
357 if (ret < 0)
358 return ret;
359 if (ret != index_entry->size) {
360 return AVERROR(EIO);
361 }
362
363 if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
364 // frames_per_chunk should always be one here; the header
365 // parsing will warn if it isn't.
366 pkt->duration = rpl->frames_per_chunk;
367 } else {
368 // All the audio codecs supported in this container
369 // (at least so far) are constant-bitrate.
370 pkt->duration = ret * 8;
371 }
372 pkt->pts = index_entry->timestamp;
373 pkt->stream_index = rpl->chunk_part;
374 rpl->chunk_part++;
375 }
376
377 // None of the Escape formats have keyframes, and the ADPCM
378 // format used doesn't have keyframes.
379 if (rpl->chunk_number == 0 && rpl->frame_in_part == 0)
380 pkt->flags |= AV_PKT_FLAG_KEY;
381
382 return ret;
383 }
384
385 AVInputFormat ff_rpl_demuxer = {
386 .name = "rpl",
387 .long_name = NULL_IF_CONFIG_SMALL("RPL / ARMovie"),
388 .priv_data_size = sizeof(RPLContext),
389 .read_probe = rpl_probe,
390 .read_header = rpl_read_header,
391 .read_packet = rpl_read_packet,
392 };
393