1 /*
2 * 4X Technologies .4xm File Demuxer (no muxer)
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 * 4X Technologies file demuxer
25 * by Mike Melanson (melanson@pcisys.net)
26 * for more information on the .4xm file format, visit:
27 * http://www.pcisys.net/~melanson/codecs/
28 */
29
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/intfloat.h"
32 #include "libavcodec/internal.h"
33 #include "avformat.h"
34 #include "internal.h"
35
36 #define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
37 #define FOURXMV_TAG MKTAG('4', 'X', 'M', 'V')
38 #define LIST_TAG MKTAG('L', 'I', 'S', 'T')
39 #define HEAD_TAG MKTAG('H', 'E', 'A', 'D')
40 #define TRK__TAG MKTAG('T', 'R', 'K', '_')
41 #define MOVI_TAG MKTAG('M', 'O', 'V', 'I')
42 #define VTRK_TAG MKTAG('V', 'T', 'R', 'K')
43 #define STRK_TAG MKTAG('S', 'T', 'R', 'K')
44 #define std__TAG MKTAG('s', 't', 'd', '_')
45 #define name_TAG MKTAG('n', 'a', 'm', 'e')
46 #define vtrk_TAG MKTAG('v', 't', 'r', 'k')
47 #define strk_TAG MKTAG('s', 't', 'r', 'k')
48 #define ifrm_TAG MKTAG('i', 'f', 'r', 'm')
49 #define pfrm_TAG MKTAG('p', 'f', 'r', 'm')
50 #define cfrm_TAG MKTAG('c', 'f', 'r', 'm')
51 #define ifr2_TAG MKTAG('i', 'f', 'r', '2')
52 #define pfr2_TAG MKTAG('p', 'f', 'r', '2')
53 #define cfr2_TAG MKTAG('c', 'f', 'r', '2')
54 #define snd__TAG MKTAG('s', 'n', 'd', '_')
55
56 #define vtrk_SIZE 0x44
57 #define strk_SIZE 0x28
58
59 #define GET_LIST_HEADER() \
60 fourcc_tag = avio_rl32(pb); \
61 size = avio_rl32(pb); \
62 if (fourcc_tag != LIST_TAG) { \
63 ret = AVERROR_INVALIDDATA; \
64 goto fail; \
65 } \
66 fourcc_tag = avio_rl32(pb);
67
68 typedef struct AudioTrack {
69 int sample_rate;
70 int bits;
71 int channels;
72 int stream_index;
73 int adpcm;
74 int64_t audio_pts;
75 } AudioTrack;
76
77 typedef struct FourxmDemuxContext {
78 int video_stream_index;
79 int track_count;
80 AudioTrack *tracks;
81
82 int64_t video_pts;
83 AVRational fps;
84 } FourxmDemuxContext;
85
fourxm_probe(const AVProbeData * p)86 static int fourxm_probe(const AVProbeData *p)
87 {
88 if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
89 (AV_RL32(&p->buf[8]) != FOURXMV_TAG))
90 return 0;
91
92 return AVPROBE_SCORE_MAX;
93 }
94
parse_vtrk(AVFormatContext * s,FourxmDemuxContext * fourxm,uint8_t * buf,int size,int left)95 static int parse_vtrk(AVFormatContext *s,
96 FourxmDemuxContext *fourxm, uint8_t *buf, int size,
97 int left)
98 {
99 AVStream *st;
100 /* check that there is enough data */
101 if (size != vtrk_SIZE || left < size + 8) {
102 return AVERROR_INVALIDDATA;
103 }
104
105 /* allocate a new AVStream */
106 st = avformat_new_stream(s, NULL);
107 if (!st)
108 return AVERROR(ENOMEM);
109
110 avpriv_set_pts_info(st, 60, fourxm->fps.den, fourxm->fps.num);
111
112 fourxm->video_stream_index = st->index;
113
114 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
115 st->codecpar->codec_id = AV_CODEC_ID_4XM;
116
117 st->codecpar->extradata = av_mallocz(4 + AV_INPUT_BUFFER_PADDING_SIZE);
118 if (!st->codecpar->extradata)
119 return AVERROR(ENOMEM);
120 st->codecpar->extradata_size = 4;
121 AV_WL32(st->codecpar->extradata, AV_RL32(buf + 16));
122 st->codecpar->width = AV_RL32(buf + 36);
123 st->codecpar->height = AV_RL32(buf + 40);
124
125 return 0;
126 }
127
128
parse_strk(AVFormatContext * s,FourxmDemuxContext * fourxm,uint8_t * buf,int size,int left)129 static int parse_strk(AVFormatContext *s,
130 FourxmDemuxContext *fourxm, uint8_t *buf, int size,
131 int left)
132 {
133 AVStream *st;
134 int track;
135 /* check that there is enough data */
136 if (size != strk_SIZE || left < size + 8)
137 return AVERROR_INVALIDDATA;
138
139 track = AV_RL32(buf + 8);
140 if ((unsigned)track >= UINT_MAX / sizeof(AudioTrack) - 1) {
141 av_log(s, AV_LOG_ERROR, "current_track too large\n");
142 return AVERROR_INVALIDDATA;
143 }
144
145 if (track + 1 > fourxm->track_count) {
146 if (av_reallocp_array(&fourxm->tracks, track + 1, sizeof(AudioTrack)))
147 return AVERROR(ENOMEM);
148 memset(&fourxm->tracks[fourxm->track_count], 0,
149 sizeof(AudioTrack) * (track + 1 - fourxm->track_count));
150 fourxm->track_count = track + 1;
151 }
152 fourxm->tracks[track].adpcm = AV_RL32(buf + 12);
153 fourxm->tracks[track].channels = AV_RL32(buf + 36);
154 fourxm->tracks[track].sample_rate = AV_RL32(buf + 40);
155 fourxm->tracks[track].bits = AV_RL32(buf + 44);
156 fourxm->tracks[track].audio_pts = 0;
157
158 if (fourxm->tracks[track].channels <= 0 ||
159 fourxm->tracks[track].channels > FF_SANE_NB_CHANNELS ||
160 fourxm->tracks[track].sample_rate <= 0 ||
161 fourxm->tracks[track].bits <= 0 ||
162 fourxm->tracks[track].bits > INT_MAX / FF_SANE_NB_CHANNELS) {
163 av_log(s, AV_LOG_ERROR, "audio header invalid\n");
164 return AVERROR_INVALIDDATA;
165 }
166 if (!fourxm->tracks[track].adpcm && fourxm->tracks[track].bits<8) {
167 av_log(s, AV_LOG_ERROR, "bits unspecified for non ADPCM\n");
168 return AVERROR_INVALIDDATA;
169 }
170
171 if (fourxm->tracks[track].sample_rate > INT64_MAX / fourxm->tracks[track].bits / fourxm->tracks[track].channels) {
172 av_log(s, AV_LOG_ERROR, "Overflow during bit rate calculation %d * %d * %d\n",
173 fourxm->tracks[track].sample_rate, fourxm->tracks[track].bits, fourxm->tracks[track].channels);
174 return AVERROR_INVALIDDATA;
175 }
176
177 /* allocate a new AVStream */
178 st = avformat_new_stream(s, NULL);
179 if (!st)
180 return AVERROR(ENOMEM);
181
182 st->id = track;
183 avpriv_set_pts_info(st, 60, 1, fourxm->tracks[track].sample_rate);
184
185 fourxm->tracks[track].stream_index = st->index;
186
187 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
188 st->codecpar->codec_tag = 0;
189 st->codecpar->channels = fourxm->tracks[track].channels;
190 st->codecpar->sample_rate = fourxm->tracks[track].sample_rate;
191 st->codecpar->bits_per_coded_sample = fourxm->tracks[track].bits;
192 st->codecpar->bit_rate = (int64_t)st->codecpar->channels *
193 st->codecpar->sample_rate *
194 st->codecpar->bits_per_coded_sample;
195 st->codecpar->block_align = st->codecpar->channels *
196 st->codecpar->bits_per_coded_sample;
197
198 if (fourxm->tracks[track].adpcm){
199 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_4XM;
200 } else if (st->codecpar->bits_per_coded_sample == 8) {
201 st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
202 } else
203 st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
204
205 return 0;
206 }
207
fourxm_read_header(AVFormatContext * s)208 static int fourxm_read_header(AVFormatContext *s)
209 {
210 AVIOContext *pb = s->pb;
211 unsigned int fourcc_tag;
212 unsigned int size;
213 int header_size;
214 FourxmDemuxContext *fourxm = s->priv_data;
215 unsigned char *header = NULL;
216 int i, ret;
217
218 fourxm->track_count = 0;
219 fourxm->tracks = NULL;
220 fourxm->fps = (AVRational){1,1};
221 fourxm->video_stream_index = -1;
222
223 /* skip the first 3 32-bit numbers */
224 avio_skip(pb, 12);
225
226 /* check for LIST-HEAD */
227 GET_LIST_HEADER();
228 header_size = size - 4;
229 if (fourcc_tag != HEAD_TAG || header_size < 0)
230 return AVERROR_INVALIDDATA;
231
232 /* allocate space for the header and load the whole thing */
233 header = av_malloc(header_size);
234 if (!header)
235 return AVERROR(ENOMEM);
236 if (avio_read(pb, header, header_size) != header_size) {
237 av_free(header);
238 return AVERROR(EIO);
239 }
240
241 /* take the lazy approach and search for any and all vtrk and strk chunks */
242 for (i = 0; i < header_size - 8; i++) {
243 fourcc_tag = AV_RL32(&header[i]);
244 size = AV_RL32(&header[i + 4]);
245 if (size > header_size - i - 8 && (fourcc_tag == vtrk_TAG || fourcc_tag == strk_TAG)) {
246 av_log(s, AV_LOG_ERROR, "chunk larger than array %d>%d\n", size, header_size - i - 8);
247 ret = AVERROR_INVALIDDATA;
248 goto fail;
249 }
250
251 if (fourcc_tag == std__TAG) {
252 if (header_size - i < 16) {
253 av_log(s, AV_LOG_ERROR, "std TAG truncated\n");
254 ret = AVERROR_INVALIDDATA;
255 goto fail;
256 }
257 fourxm->fps = av_d2q(av_int2float(AV_RL32(&header[i + 12])), 10000);
258 } else if (fourcc_tag == vtrk_TAG) {
259 if ((ret = parse_vtrk(s, fourxm, header + i, size,
260 header_size - i)) < 0)
261 goto fail;
262
263 i += 8 + size;
264 } else if (fourcc_tag == strk_TAG) {
265 if ((ret = parse_strk(s, fourxm, header + i, size,
266 header_size - i)) < 0)
267 goto fail;
268
269 i += 8 + size;
270 }
271 }
272
273 /* skip over the LIST-MOVI chunk (which is where the stream should be */
274 GET_LIST_HEADER();
275 if (fourcc_tag != MOVI_TAG) {
276 ret = AVERROR_INVALIDDATA;
277 goto fail;
278 }
279
280 av_free(header);
281 /* initialize context members */
282 fourxm->video_pts = -1; /* first frame will push to 0 */
283
284 return 0;
285 fail:
286 av_freep(&fourxm->tracks);
287 av_free(header);
288 return ret;
289 }
290
fourxm_read_packet(AVFormatContext * s,AVPacket * pkt)291 static int fourxm_read_packet(AVFormatContext *s,
292 AVPacket *pkt)
293 {
294 FourxmDemuxContext *fourxm = s->priv_data;
295 AVIOContext *pb = s->pb;
296 unsigned int fourcc_tag;
297 unsigned int size;
298 int ret = 0;
299 unsigned int track_number;
300 int packet_read = 0;
301 unsigned char header[8];
302 int64_t audio_frame_count;
303
304 while (!packet_read) {
305 if ((ret = avio_read(s->pb, header, 8)) < 0)
306 return ret;
307 fourcc_tag = AV_RL32(&header[0]);
308 size = AV_RL32(&header[4]);
309 if (avio_feof(pb))
310 return AVERROR(EIO);
311 switch (fourcc_tag) {
312 case LIST_TAG:
313 /* this is a good time to bump the video pts */
314 fourxm->video_pts++;
315
316 /* skip the LIST-* tag and move on to the next fourcc */
317 avio_rl32(pb);
318 break;
319
320 case ifrm_TAG:
321 case pfrm_TAG:
322 case cfrm_TAG:
323 case ifr2_TAG:
324 case pfr2_TAG:
325 case cfr2_TAG:
326 /* allocate 8 more bytes than 'size' to account for fourcc
327 * and size */
328 if (size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE - 8)
329 return AVERROR_INVALIDDATA;
330 if (fourxm->video_stream_index < 0)
331 return AVERROR_INVALIDDATA;
332 if ((ret = av_new_packet(pkt, size + 8)) < 0)
333 return ret;
334 pkt->stream_index = fourxm->video_stream_index;
335 pkt->pts = fourxm->video_pts;
336 pkt->pos = avio_tell(s->pb);
337 memcpy(pkt->data, header, 8);
338 ret = avio_read(s->pb, &pkt->data[8], size);
339
340 if (ret < 0) {
341 av_packet_unref(pkt);
342 } else {
343 packet_read = 1;
344 av_shrink_packet(pkt, ret + 8);
345 }
346 break;
347
348 case snd__TAG:
349 track_number = avio_rl32(pb);
350 avio_skip(pb, 4);
351 size -= 8;
352
353 if (track_number < fourxm->track_count &&
354 fourxm->tracks[track_number].channels > 0) {
355 ret = av_get_packet(s->pb, pkt, size);
356 if (ret < 0)
357 return ret;
358 pkt->stream_index =
359 fourxm->tracks[track_number].stream_index;
360 pkt->pts = fourxm->tracks[track_number].audio_pts;
361 packet_read = 1;
362
363 /* pts accounting */
364 audio_frame_count = size;
365 if (fourxm->tracks[track_number].adpcm)
366 audio_frame_count -= 2 * (fourxm->tracks[track_number].channels);
367 audio_frame_count /= fourxm->tracks[track_number].channels;
368 if (fourxm->tracks[track_number].adpcm) {
369 audio_frame_count *= 2;
370 } else
371 audio_frame_count /=
372 (fourxm->tracks[track_number].bits / 8);
373 fourxm->tracks[track_number].audio_pts += audio_frame_count;
374 } else {
375 avio_skip(pb, size);
376 }
377 break;
378
379 default:
380 avio_skip(pb, size);
381 break;
382 }
383 }
384 return ret;
385 }
386
fourxm_read_close(AVFormatContext * s)387 static int fourxm_read_close(AVFormatContext *s)
388 {
389 FourxmDemuxContext *fourxm = s->priv_data;
390
391 av_freep(&fourxm->tracks);
392
393 return 0;
394 }
395
396 AVInputFormat ff_fourxm_demuxer = {
397 .name = "4xm",
398 .long_name = NULL_IF_CONFIG_SMALL("4X Technologies"),
399 .priv_data_size = sizeof(FourxmDemuxContext),
400 .read_probe = fourxm_probe,
401 .read_header = fourxm_read_header,
402 .read_packet = fourxm_read_packet,
403 .read_close = fourxm_read_close,
404 };
405