Prefer av_freep() over av_free() for variables in the context for safety.
[libav.git] / libavformat / 4xm.c
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 4xm.c
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 "avformat.h"
32
33 #define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
34 #define FOURXMV_TAG MKTAG('4', 'X', 'M', 'V')
35 #define LIST_TAG MKTAG('L', 'I', 'S', 'T')
36 #define HEAD_TAG MKTAG('H', 'E', 'A', 'D')
37 #define TRK__TAG MKTAG('T', 'R', 'K', '_')
38 #define MOVI_TAG MKTAG('M', 'O', 'V', 'I')
39 #define VTRK_TAG MKTAG('V', 'T', 'R', 'K')
40 #define STRK_TAG MKTAG('S', 'T', 'R', 'K')
41 #define std__TAG MKTAG('s', 't', 'd', '_')
42 #define name_TAG MKTAG('n', 'a', 'm', 'e')
43 #define vtrk_TAG MKTAG('v', 't', 'r', 'k')
44 #define strk_TAG MKTAG('s', 't', 'r', 'k')
45 #define ifrm_TAG MKTAG('i', 'f', 'r', 'm')
46 #define pfrm_TAG MKTAG('p', 'f', 'r', 'm')
47 #define cfrm_TAG MKTAG('c', 'f', 'r', 'm')
48 #define ifr2_TAG MKTAG('i', 'f', 'r', '2')
49 #define pfr2_TAG MKTAG('p', 'f', 'r', '2')
50 #define cfr2_TAG MKTAG('c', 'f', 'r', '2')
51 #define snd__TAG MKTAG('s', 'n', 'd', '_')
52
53 #define vtrk_SIZE 0x44
54 #define strk_SIZE 0x28
55
56 #define GET_LIST_HEADER() \
57 fourcc_tag = get_le32(pb); \
58 size = get_le32(pb); \
59 if (fourcc_tag != LIST_TAG) \
60 return AVERROR_INVALIDDATA; \
61 fourcc_tag = get_le32(pb);
62
63 typedef struct AudioTrack {
64 int sample_rate;
65 int bits;
66 int channels;
67 int stream_index;
68 int adpcm;
69 int64_t audio_pts;
70 } AudioTrack;
71
72 typedef struct FourxmDemuxContext {
73 int width;
74 int height;
75 int video_stream_index;
76 int track_count;
77 AudioTrack *tracks;
78
79 int64_t video_pts;
80 float fps;
81 } FourxmDemuxContext;
82
83 static int fourxm_probe(AVProbeData *p)
84 {
85 if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
86 (AV_RL32(&p->buf[8]) != FOURXMV_TAG))
87 return 0;
88
89 return AVPROBE_SCORE_MAX;
90 }
91
92 static int fourxm_read_header(AVFormatContext *s,
93 AVFormatParameters *ap)
94 {
95 ByteIOContext *pb = s->pb;
96 unsigned int fourcc_tag;
97 unsigned int size;
98 int header_size;
99 FourxmDemuxContext *fourxm = s->priv_data;
100 unsigned char *header;
101 int i, ret;
102 AVStream *st;
103
104 fourxm->track_count = 0;
105 fourxm->tracks = NULL;
106 fourxm->fps = 1.0;
107
108 /* skip the first 3 32-bit numbers */
109 url_fseek(pb, 12, SEEK_CUR);
110
111 /* check for LIST-HEAD */
112 GET_LIST_HEADER();
113 header_size = size - 4;
114 if (fourcc_tag != HEAD_TAG || header_size < 0)
115 return AVERROR_INVALIDDATA;
116
117 /* allocate space for the header and load the whole thing */
118 header = av_malloc(header_size);
119 if (!header)
120 return AVERROR(ENOMEM);
121 if (get_buffer(pb, header, header_size) != header_size){
122 av_free(header);
123 return AVERROR(EIO);
124 }
125
126 /* take the lazy approach and search for any and all vtrk and strk chunks */
127 for (i = 0; i < header_size - 8; i++) {
128 fourcc_tag = AV_RL32(&header[i]);
129 size = AV_RL32(&header[i + 4]);
130
131 if (fourcc_tag == std__TAG) {
132 fourxm->fps = av_int2flt(AV_RL32(&header[i + 12]));
133 } else if (fourcc_tag == vtrk_TAG) {
134 /* check that there is enough data */
135 if (size != vtrk_SIZE) {
136 ret= AVERROR_INVALIDDATA;
137 goto fail;
138 }
139 fourxm->width = AV_RL32(&header[i + 36]);
140 fourxm->height = AV_RL32(&header[i + 40]);
141
142 /* allocate a new AVStream */
143 st = av_new_stream(s, 0);
144 if (!st){
145 ret= AVERROR(ENOMEM);
146 goto fail;
147 }
148 av_set_pts_info(st, 60, 1, fourxm->fps);
149
150 fourxm->video_stream_index = st->index;
151
152 st->codec->codec_type = CODEC_TYPE_VIDEO;
153 st->codec->codec_id = CODEC_ID_4XM;
154 st->codec->extradata_size = 4;
155 st->codec->extradata = av_malloc(4);
156 AV_WL32(st->codec->extradata, AV_RL32(&header[i + 16]));
157 st->codec->width = fourxm->width;
158 st->codec->height = fourxm->height;
159
160 i += 8 + size;
161 } else if (fourcc_tag == strk_TAG) {
162 int current_track;
163 /* check that there is enough data */
164 if (size != strk_SIZE) {
165 ret= AVERROR_INVALIDDATA;
166 goto fail;
167 }
168 current_track = AV_RL32(&header[i + 8]);
169 if (current_track + 1 > fourxm->track_count) {
170 fourxm->track_count = current_track + 1;
171 if((unsigned)fourxm->track_count >= UINT_MAX / sizeof(AudioTrack)){
172 ret= -1;
173 goto fail;
174 }
175 fourxm->tracks = av_realloc(fourxm->tracks,
176 fourxm->track_count * sizeof(AudioTrack));
177 if (!fourxm->tracks) {
178 ret= AVERROR(ENOMEM);
179 goto fail;
180 }
181 }
182 fourxm->tracks[current_track].adpcm = AV_RL32(&header[i + 12]);
183 fourxm->tracks[current_track].channels = AV_RL32(&header[i + 36]);
184 fourxm->tracks[current_track].sample_rate = AV_RL32(&header[i + 40]);
185 fourxm->tracks[current_track].bits = AV_RL32(&header[i + 44]);
186 fourxm->tracks[current_track].audio_pts = 0;
187 i += 8 + size;
188
189 /* allocate a new AVStream */
190 st = av_new_stream(s, current_track);
191 if (!st){
192 ret= AVERROR(ENOMEM);
193 goto fail;
194 }
195
196 av_set_pts_info(st, 60, 1, fourxm->tracks[current_track].sample_rate);
197
198 fourxm->tracks[current_track].stream_index = st->index;
199
200 st->codec->codec_type = CODEC_TYPE_AUDIO;
201 st->codec->codec_tag = 0;
202 st->codec->channels = fourxm->tracks[current_track].channels;
203 st->codec->sample_rate = fourxm->tracks[current_track].sample_rate;
204 st->codec->bits_per_coded_sample = fourxm->tracks[current_track].bits;
205 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
206 st->codec->bits_per_coded_sample;
207 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
208 if (fourxm->tracks[current_track].adpcm){
209 st->codec->codec_id = CODEC_ID_ADPCM_4XM;
210 }else if (st->codec->bits_per_coded_sample == 8){
211 st->codec->codec_id = CODEC_ID_PCM_U8;
212 }else
213 st->codec->codec_id = CODEC_ID_PCM_S16LE;
214 }
215 }
216
217 /* skip over the LIST-MOVI chunk (which is where the stream should be */
218 GET_LIST_HEADER();
219 if (fourcc_tag != MOVI_TAG){
220 ret= AVERROR_INVALIDDATA;
221 goto fail;
222 }
223
224 av_free(header);
225 /* initialize context members */
226 fourxm->video_pts = -1; /* first frame will push to 0 */
227
228 return 0;
229 fail:
230 av_freep(&fourxm->tracks);
231 av_free(header);
232 return ret;
233 }
234
235 static int fourxm_read_packet(AVFormatContext *s,
236 AVPacket *pkt)
237 {
238 FourxmDemuxContext *fourxm = s->priv_data;
239 ByteIOContext *pb = s->pb;
240 unsigned int fourcc_tag;
241 unsigned int size, out_size;
242 int ret = 0;
243 unsigned int track_number;
244 int packet_read = 0;
245 unsigned char header[8];
246 int audio_frame_count;
247
248 while (!packet_read) {
249
250 if ((ret = get_buffer(s->pb, header, 8)) < 0)
251 return ret;
252 fourcc_tag = AV_RL32(&header[0]);
253 size = AV_RL32(&header[4]);
254 if (url_feof(pb))
255 return AVERROR(EIO);
256 switch (fourcc_tag) {
257
258 case LIST_TAG:
259 /* this is a good time to bump the video pts */
260 fourxm->video_pts ++;
261
262 /* skip the LIST-* tag and move on to the next fourcc */
263 get_le32(pb);
264 break;
265
266 case ifrm_TAG:
267 case pfrm_TAG:
268 case cfrm_TAG:
269 case ifr2_TAG:
270 case pfr2_TAG:
271 case cfr2_TAG:
272 /* allocate 8 more bytes than 'size' to account for fourcc
273 * and size */
274 if (size + 8 < size || av_new_packet(pkt, size + 8))
275 return AVERROR(EIO);
276 pkt->stream_index = fourxm->video_stream_index;
277 pkt->pts = fourxm->video_pts;
278 pkt->pos = url_ftell(s->pb);
279 memcpy(pkt->data, header, 8);
280 ret = get_buffer(s->pb, &pkt->data[8], size);
281
282 if (ret < 0){
283 av_free_packet(pkt);
284 }else
285 packet_read = 1;
286 break;
287
288 case snd__TAG:
289 track_number = get_le32(pb);
290 out_size= get_le32(pb);
291 size-=8;
292
293 if (track_number < fourxm->track_count) {
294 ret= av_get_packet(s->pb, pkt, size);
295 if(ret<0)
296 return AVERROR(EIO);
297 pkt->stream_index =
298 fourxm->tracks[track_number].stream_index;
299 pkt->pts = fourxm->tracks[track_number].audio_pts;
300 packet_read = 1;
301
302 /* pts accounting */
303 audio_frame_count = size;
304 if (fourxm->tracks[track_number].adpcm)
305 audio_frame_count -=
306 2 * (fourxm->tracks[track_number].channels);
307 audio_frame_count /=
308 fourxm->tracks[track_number].channels;
309 if (fourxm->tracks[track_number].adpcm){
310 audio_frame_count *= 2;
311 }else
312 audio_frame_count /=
313 (fourxm->tracks[track_number].bits / 8);
314 fourxm->tracks[track_number].audio_pts += audio_frame_count;
315
316 } else {
317 url_fseek(pb, size, SEEK_CUR);
318 }
319 break;
320
321 default:
322 url_fseek(pb, size, SEEK_CUR);
323 break;
324 }
325 }
326 return ret;
327 }
328
329 static int fourxm_read_close(AVFormatContext *s)
330 {
331 FourxmDemuxContext *fourxm = s->priv_data;
332
333 av_freep(&fourxm->tracks);
334
335 return 0;
336 }
337
338 AVInputFormat fourxm_demuxer = {
339 "4xm",
340 NULL_IF_CONFIG_SMALL("4X Technologies format"),
341 sizeof(FourxmDemuxContext),
342 fourxm_probe,
343 fourxm_read_header,
344 fourxm_read_packet,
345 fourxm_read_close,
346 };