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path: root/libavformat/4xm.c (plain)
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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 return AVERROR_INVALIDDATA; \
64 fourcc_tag = avio_rl32(pb);
65
66typedef struct AudioTrack {
67 int sample_rate;
68 int bits;
69 int channels;
70 int stream_index;
71 int adpcm;
72 int64_t audio_pts;
73} AudioTrack;
74
75typedef struct FourxmDemuxContext {
76 int video_stream_index;
77 int track_count;
78 AudioTrack *tracks;
79
80 int64_t video_pts;
81 AVRational fps;
82} FourxmDemuxContext;
83
84static int fourxm_probe(AVProbeData *p)
85{
86 if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
87 (AV_RL32(&p->buf[8]) != FOURXMV_TAG))
88 return 0;
89
90 return AVPROBE_SCORE_MAX;
91}
92
93static int parse_vtrk(AVFormatContext *s,
94 FourxmDemuxContext *fourxm, uint8_t *buf, int size,
95 int left)
96{
97 AVStream *st;
98 /* check that there is enough data */
99 if (size != vtrk_SIZE || left < size + 8) {
100 return AVERROR_INVALIDDATA;
101 }
102
103 /* allocate a new AVStream */
104 st = avformat_new_stream(s, NULL);
105 if (!st)
106 return AVERROR(ENOMEM);
107
108 avpriv_set_pts_info(st, 60, fourxm->fps.den, fourxm->fps.num);
109
110 fourxm->video_stream_index = st->index;
111
112 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
113 st->codecpar->codec_id = AV_CODEC_ID_4XM;
114
115 st->codecpar->extradata = av_mallocz(4 + AV_INPUT_BUFFER_PADDING_SIZE);
116 if (!st->codecpar->extradata)
117 return AVERROR(ENOMEM);
118 st->codecpar->extradata_size = 4;
119 AV_WL32(st->codecpar->extradata, AV_RL32(buf + 16));
120 st->codecpar->width = AV_RL32(buf + 36);
121 st->codecpar->height = AV_RL32(buf + 40);
122
123 return 0;
124}
125
126
127static int parse_strk(AVFormatContext *s,
128 FourxmDemuxContext *fourxm, uint8_t *buf, int size,
129 int left)
130{
131 AVStream *st;
132 int track;
133 /* check that there is enough data */
134 if (size != strk_SIZE || left < size + 8)
135 return AVERROR_INVALIDDATA;
136
137 track = AV_RL32(buf + 8);
138 if ((unsigned)track >= UINT_MAX / sizeof(AudioTrack) - 1) {
139 av_log(s, AV_LOG_ERROR, "current_track too large\n");
140 return AVERROR_INVALIDDATA;
141 }
142
143 if (track + 1 > fourxm->track_count) {
144 if (av_reallocp_array(&fourxm->tracks, track + 1, sizeof(AudioTrack)))
145 return AVERROR(ENOMEM);
146 memset(&fourxm->tracks[fourxm->track_count], 0,
147 sizeof(AudioTrack) * (track + 1 - fourxm->track_count));
148 fourxm->track_count = track + 1;
149 }
150 fourxm->tracks[track].adpcm = AV_RL32(buf + 12);
151 fourxm->tracks[track].channels = AV_RL32(buf + 36);
152 fourxm->tracks[track].sample_rate = AV_RL32(buf + 40);
153 fourxm->tracks[track].bits = AV_RL32(buf + 44);
154 fourxm->tracks[track].audio_pts = 0;
155
156 if (fourxm->tracks[track].channels <= 0 ||
157 fourxm->tracks[track].channels > FF_SANE_NB_CHANNELS ||
158 fourxm->tracks[track].sample_rate <= 0 ||
159 fourxm->tracks[track].bits <= 0 ||
160 fourxm->tracks[track].bits > INT_MAX / FF_SANE_NB_CHANNELS) {
161 av_log(s, AV_LOG_ERROR, "audio header invalid\n");
162 return AVERROR_INVALIDDATA;
163 }
164 if (!fourxm->tracks[track].adpcm && fourxm->tracks[track].bits<8) {
165 av_log(s, AV_LOG_ERROR, "bits unspecified for non ADPCM\n");
166 return AVERROR_INVALIDDATA;
167 }
168
169 if (fourxm->tracks[track].sample_rate > INT64_MAX / fourxm->tracks[track].bits / fourxm->tracks[track].channels) {
170 av_log(s, AV_LOG_ERROR, "Overflow during bit rate calculation %d * %d * %d\n",
171 fourxm->tracks[track].sample_rate, fourxm->tracks[track].bits, fourxm->tracks[track].channels);
172 return AVERROR_INVALIDDATA;
173 }
174
175 /* allocate a new AVStream */
176 st = avformat_new_stream(s, NULL);
177 if (!st)
178 return AVERROR(ENOMEM);
179
180 st->id = track;
181 avpriv_set_pts_info(st, 60, 1, fourxm->tracks[track].sample_rate);
182
183 fourxm->tracks[track].stream_index = st->index;
184
185 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
186 st->codecpar->codec_tag = 0;
187 st->codecpar->channels = fourxm->tracks[track].channels;
188 st->codecpar->sample_rate = fourxm->tracks[track].sample_rate;
189 st->codecpar->bits_per_coded_sample = fourxm->tracks[track].bits;
190 st->codecpar->bit_rate = (int64_t)st->codecpar->channels *
191 st->codecpar->sample_rate *
192 st->codecpar->bits_per_coded_sample;
193 st->codecpar->block_align = st->codecpar->channels *
194 st->codecpar->bits_per_coded_sample;
195
196 if (fourxm->tracks[track].adpcm){
197 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_4XM;
198 } else if (st->codecpar->bits_per_coded_sample == 8) {
199 st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
200 } else
201 st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
202
203 return 0;
204}
205
206static int fourxm_read_header(AVFormatContext *s)
207{
208 AVIOContext *pb = s->pb;
209 unsigned int fourcc_tag;
210 unsigned int size;
211 int header_size;
212 FourxmDemuxContext *fourxm = s->priv_data;
213 unsigned char *header;
214 int i, ret;
215
216 fourxm->track_count = 0;
217 fourxm->tracks = NULL;
218 fourxm->fps = (AVRational){1,1};
219
220 /* skip the first 3 32-bit numbers */
221 avio_skip(pb, 12);
222
223 /* check for LIST-HEAD */
224 GET_LIST_HEADER();
225 header_size = size - 4;
226 if (fourcc_tag != HEAD_TAG || header_size < 0)
227 return AVERROR_INVALIDDATA;
228
229 /* allocate space for the header and load the whole thing */
230 header = av_malloc(header_size);
231 if (!header)
232 return AVERROR(ENOMEM);
233 if (avio_read(pb, header, header_size) != header_size) {
234 av_free(header);
235 return AVERROR(EIO);
236 }
237
238 /* take the lazy approach and search for any and all vtrk and strk chunks */
239 for (i = 0; i < header_size - 8; i++) {
240 fourcc_tag = AV_RL32(&header[i]);
241 size = AV_RL32(&header[i + 4]);
242 if (size > header_size - i - 8 && (fourcc_tag == vtrk_TAG || fourcc_tag == strk_TAG)) {
243 av_log(s, AV_LOG_ERROR, "chunk larger than array %d>%d\n", size, header_size - i - 8);
244 return AVERROR_INVALIDDATA;
245 }
246
247 if (fourcc_tag == std__TAG) {
248 if (header_size - i < 16) {
249 av_log(s, AV_LOG_ERROR, "std TAG truncated\n");
250 ret = AVERROR_INVALIDDATA;
251 goto fail;
252 }
253 fourxm->fps = av_d2q(av_int2float(AV_RL32(&header[i + 12])), 10000);
254 } else if (fourcc_tag == vtrk_TAG) {
255 if ((ret = parse_vtrk(s, fourxm, header + i, size,
256 header_size - i)) < 0)
257 goto fail;
258
259 i += 8 + size;
260 } else if (fourcc_tag == strk_TAG) {
261 if ((ret = parse_strk(s, fourxm, header + i, size,
262 header_size - i)) < 0)
263 goto fail;
264
265 i += 8 + size;
266 }
267 }
268
269 /* skip over the LIST-MOVI chunk (which is where the stream should be */
270 GET_LIST_HEADER();
271 if (fourcc_tag != MOVI_TAG) {
272 ret = AVERROR_INVALIDDATA;
273 goto fail;
274 }
275
276 av_free(header);
277 /* initialize context members */
278 fourxm->video_pts = -1; /* first frame will push to 0 */
279
280 return 0;
281fail:
282 av_freep(&fourxm->tracks);
283 av_free(header);
284 return ret;
285}
286
287static int fourxm_read_packet(AVFormatContext *s,
288 AVPacket *pkt)
289{
290 FourxmDemuxContext *fourxm = s->priv_data;
291 AVIOContext *pb = s->pb;
292 unsigned int fourcc_tag;
293 unsigned int size;
294 int ret = 0;
295 unsigned int track_number;
296 int packet_read = 0;
297 unsigned char header[8];
298 int audio_frame_count;
299
300 while (!packet_read) {
301 if ((ret = avio_read(s->pb, header, 8)) < 0)
302 return ret;
303 fourcc_tag = AV_RL32(&header[0]);
304 size = AV_RL32(&header[4]);
305 if (avio_feof(pb))
306 return AVERROR(EIO);
307 switch (fourcc_tag) {
308 case LIST_TAG:
309 /* this is a good time to bump the video pts */
310 fourxm->video_pts++;
311
312 /* skip the LIST-* tag and move on to the next fourcc */
313 avio_rl32(pb);
314 break;
315
316 case ifrm_TAG:
317 case pfrm_TAG:
318 case cfrm_TAG:
319 case ifr2_TAG:
320 case pfr2_TAG:
321 case cfr2_TAG:
322 /* allocate 8 more bytes than 'size' to account for fourcc
323 * and size */
324 if (size + 8 < size || av_new_packet(pkt, size + 8))
325 return AVERROR(EIO);
326 pkt->stream_index = fourxm->video_stream_index;
327 pkt->pts = fourxm->video_pts;
328 pkt->pos = avio_tell(s->pb);
329 memcpy(pkt->data, header, 8);
330 ret = avio_read(s->pb, &pkt->data[8], size);
331
332 if (ret < 0) {
333 av_packet_unref(pkt);
334 } else {
335 packet_read = 1;
336 av_shrink_packet(pkt, ret + 8);
337 }
338 break;
339
340 case snd__TAG:
341 track_number = avio_rl32(pb);
342 avio_skip(pb, 4);
343 size -= 8;
344
345 if (track_number < fourxm->track_count &&
346 fourxm->tracks[track_number].channels > 0) {
347 ret = av_get_packet(s->pb, pkt, size);
348 if (ret < 0)
349 return AVERROR(EIO);
350 pkt->stream_index =
351 fourxm->tracks[track_number].stream_index;
352 pkt->pts = fourxm->tracks[track_number].audio_pts;
353 packet_read = 1;
354
355 /* pts accounting */
356 audio_frame_count = size;
357 if (fourxm->tracks[track_number].adpcm)
358 audio_frame_count -= 2 * (fourxm->tracks[track_number].channels);
359 audio_frame_count /= fourxm->tracks[track_number].channels;
360 if (fourxm->tracks[track_number].adpcm) {
361 audio_frame_count *= 2;
362 } else
363 audio_frame_count /=
364 (fourxm->tracks[track_number].bits / 8);
365 fourxm->tracks[track_number].audio_pts += audio_frame_count;
366 } else {
367 avio_skip(pb, size);
368 }
369 break;
370
371 default:
372 avio_skip(pb, size);
373 break;
374 }
375 }
376 return ret;
377}
378
379static int fourxm_read_close(AVFormatContext *s)
380{
381 FourxmDemuxContext *fourxm = s->priv_data;
382
383 av_freep(&fourxm->tracks);
384
385 return 0;
386}
387
388AVInputFormat ff_fourxm_demuxer = {
389 .name = "4xm",
390 .long_name = NULL_IF_CONFIG_SMALL("4X Technologies"),
391 .priv_data_size = sizeof(FourxmDemuxContext),
392 .read_probe = fourxm_probe,
393 .read_header = fourxm_read_header,
394 .read_packet = fourxm_read_packet,
395 .read_close = fourxm_read_close,
396};
397
generated by cgit at 2024-05-17 07:00:01 (GMT)