segafilm: fix leaks if reading the header fails
[libav.git] / libavformat / segafilm.c
1 /*
2 * Sega FILM Format (CPK) Demuxer
3 * Copyright (c) 2003 The ffmpeg Project
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 * Sega FILM (.cpk) file demuxer
25 * by Mike Melanson (melanson@pcisys.net)
26 * For more information regarding the Sega FILM file format, visit:
27 * http://www.pcisys.net/~melanson/codecs/
28 */
29
30 #include "libavutil/intreadwrite.h"
31 #include "avformat.h"
32 #include "internal.h"
33
34 #define FILM_TAG MKBETAG('F', 'I', 'L', 'M')
35 #define FDSC_TAG MKBETAG('F', 'D', 'S', 'C')
36 #define STAB_TAG MKBETAG('S', 'T', 'A', 'B')
37 #define CVID_TAG MKBETAG('c', 'v', 'i', 'd')
38 #define RAW_TAG MKBETAG('r', 'a', 'w', ' ')
39
40 typedef struct {
41 int stream;
42 int64_t sample_offset;
43 unsigned int sample_size;
44 int64_t pts;
45 int keyframe;
46 } film_sample;
47
48 typedef struct FilmDemuxContext {
49 int video_stream_index;
50 int audio_stream_index;
51
52 enum AVCodecID audio_type;
53 unsigned int audio_samplerate;
54 unsigned int audio_bits;
55 unsigned int audio_channels;
56
57 enum AVCodecID video_type;
58 unsigned int sample_count;
59 film_sample *sample_table;
60 unsigned int current_sample;
61
62 unsigned int base_clock;
63 unsigned int version;
64
65 /* buffer used for interleaving stereo PCM data */
66 unsigned char *stereo_buffer;
67 int stereo_buffer_size;
68 } FilmDemuxContext;
69
70 static int film_probe(AVProbeData *p)
71 {
72 if (AV_RB32(&p->buf[0]) != FILM_TAG)
73 return 0;
74
75 return AVPROBE_SCORE_MAX;
76 }
77
78 static int film_read_close(AVFormatContext *s)
79 {
80 FilmDemuxContext *film = s->priv_data;
81
82 av_freep(&film->sample_table);
83 av_freep(&film->stereo_buffer);
84
85 return 0;
86 }
87
88 static int film_read_header(AVFormatContext *s)
89 {
90 FilmDemuxContext *film = s->priv_data;
91 AVIOContext *pb = s->pb;
92 AVStream *st;
93 unsigned char scratch[256];
94 int i, ret;
95 unsigned int data_offset;
96 unsigned int audio_frame_counter;
97
98 film->sample_table = NULL;
99 film->stereo_buffer = NULL;
100 film->stereo_buffer_size = 0;
101
102 /* load the main FILM header */
103 if (avio_read(pb, scratch, 16) != 16)
104 return AVERROR(EIO);
105 data_offset = AV_RB32(&scratch[4]);
106 film->version = AV_RB32(&scratch[8]);
107
108 /* load the FDSC chunk */
109 if (film->version == 0) {
110 /* special case for Lemmings .film files; 20-byte header */
111 if (avio_read(pb, scratch, 20) != 20)
112 return AVERROR(EIO);
113 /* make some assumptions about the audio parameters */
114 film->audio_type = AV_CODEC_ID_PCM_S8;
115 film->audio_samplerate = 22050;
116 film->audio_channels = 1;
117 film->audio_bits = 8;
118 } else {
119 /* normal Saturn .cpk files; 32-byte header */
120 if (avio_read(pb, scratch, 32) != 32)
121 return AVERROR(EIO);
122 film->audio_samplerate = AV_RB16(&scratch[24]);
123 film->audio_channels = scratch[21];
124 if (!film->audio_channels || film->audio_channels > 2) {
125 av_log(s, AV_LOG_ERROR,
126 "Invalid number of channels: %d\n", film->audio_channels);
127 return AVERROR_INVALIDDATA;
128 }
129 film->audio_bits = scratch[22];
130 if (scratch[23] == 2)
131 film->audio_type = AV_CODEC_ID_ADPCM_ADX;
132 else if (film->audio_channels > 0) {
133 if (film->audio_bits == 8)
134 film->audio_type = AV_CODEC_ID_PCM_S8;
135 else if (film->audio_bits == 16)
136 film->audio_type = AV_CODEC_ID_PCM_S16BE;
137 else
138 film->audio_type = AV_CODEC_ID_NONE;
139 } else
140 film->audio_type = AV_CODEC_ID_NONE;
141 }
142
143 if (AV_RB32(&scratch[0]) != FDSC_TAG)
144 return AVERROR_INVALIDDATA;
145
146 if (AV_RB32(&scratch[8]) == CVID_TAG) {
147 film->video_type = AV_CODEC_ID_CINEPAK;
148 } else if (AV_RB32(&scratch[8]) == RAW_TAG) {
149 film->video_type = AV_CODEC_ID_RAWVIDEO;
150 } else {
151 film->video_type = AV_CODEC_ID_NONE;
152 }
153
154 /* initialize the decoder streams */
155 if (film->video_type) {
156 st = avformat_new_stream(s, NULL);
157 if (!st)
158 return AVERROR(ENOMEM);
159 film->video_stream_index = st->index;
160 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
161 st->codec->codec_id = film->video_type;
162 st->codec->codec_tag = 0; /* no fourcc */
163 st->codec->width = AV_RB32(&scratch[16]);
164 st->codec->height = AV_RB32(&scratch[12]);
165
166 if (film->video_type == AV_CODEC_ID_RAWVIDEO) {
167 if (scratch[20] == 24) {
168 st->codec->pix_fmt = AV_PIX_FMT_RGB24;
169 } else {
170 av_log(s, AV_LOG_ERROR, "raw video is using unhandled %dbpp\n", scratch[20]);
171 return -1;
172 }
173 }
174 }
175
176 if (film->audio_type) {
177 st = avformat_new_stream(s, NULL);
178 if (!st)
179 return AVERROR(ENOMEM);
180 film->audio_stream_index = st->index;
181 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
182 st->codec->codec_id = film->audio_type;
183 st->codec->codec_tag = 1;
184 st->codec->channels = film->audio_channels;
185 st->codec->sample_rate = film->audio_samplerate;
186
187 if (film->audio_type == AV_CODEC_ID_ADPCM_ADX) {
188 st->codec->bits_per_coded_sample = 18 * 8 / 32;
189 st->codec->block_align = st->codec->channels * 18;
190 st->need_parsing = AVSTREAM_PARSE_FULL;
191 } else {
192 st->codec->bits_per_coded_sample = film->audio_bits;
193 st->codec->block_align = st->codec->channels *
194 st->codec->bits_per_coded_sample / 8;
195 }
196
197 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
198 st->codec->bits_per_coded_sample;
199 }
200
201 /* load the sample table */
202 if (avio_read(pb, scratch, 16) != 16)
203 return AVERROR(EIO);
204 if (AV_RB32(&scratch[0]) != STAB_TAG)
205 return AVERROR_INVALIDDATA;
206 film->base_clock = AV_RB32(&scratch[8]);
207 film->sample_count = AV_RB32(&scratch[12]);
208 if(film->sample_count >= UINT_MAX / sizeof(film_sample))
209 return -1;
210 film->sample_table = av_malloc(film->sample_count * sizeof(film_sample));
211 if (!film->sample_table)
212 return AVERROR(ENOMEM);
213
214 for (i = 0; i < s->nb_streams; i++) {
215 st = s->streams[i];
216 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
217 avpriv_set_pts_info(st, 33, 1, film->base_clock);
218 else
219 avpriv_set_pts_info(st, 64, 1, film->audio_samplerate);
220 }
221
222 audio_frame_counter = 0;
223 for (i = 0; i < film->sample_count; i++) {
224 /* load the next sample record and transfer it to an internal struct */
225 if (avio_read(pb, scratch, 16) != 16) {
226 ret = AVERROR(EIO);
227 goto fail;
228 }
229 film->sample_table[i].sample_offset =
230 data_offset + AV_RB32(&scratch[0]);
231 film->sample_table[i].sample_size = AV_RB32(&scratch[4]);
232 if (film->sample_table[i].sample_size > INT_MAX / 4) {
233 ret = AVERROR_INVALIDDATA;
234 goto fail;
235 }
236 if (AV_RB32(&scratch[8]) == 0xFFFFFFFF) {
237 film->sample_table[i].stream = film->audio_stream_index;
238 film->sample_table[i].pts = audio_frame_counter;
239
240 if (film->audio_type == AV_CODEC_ID_ADPCM_ADX)
241 audio_frame_counter += (film->sample_table[i].sample_size * 32 /
242 (18 * film->audio_channels));
243 else if (film->audio_type != AV_CODEC_ID_NONE)
244 audio_frame_counter += (film->sample_table[i].sample_size /
245 (film->audio_channels * film->audio_bits / 8));
246 } else {
247 film->sample_table[i].stream = film->video_stream_index;
248 film->sample_table[i].pts = AV_RB32(&scratch[8]) & 0x7FFFFFFF;
249 film->sample_table[i].keyframe = (scratch[8] & 0x80) ? 0 : 1;
250 }
251 }
252
253 film->current_sample = 0;
254
255 return 0;
256 fail:
257 film_read_close(s);
258 return ret;
259 }
260
261 static int film_read_packet(AVFormatContext *s,
262 AVPacket *pkt)
263 {
264 FilmDemuxContext *film = s->priv_data;
265 AVIOContext *pb = s->pb;
266 film_sample *sample;
267 int ret = 0;
268 int i;
269 int left, right;
270
271 if (film->current_sample >= film->sample_count)
272 return AVERROR(EIO);
273
274 sample = &film->sample_table[film->current_sample];
275
276 /* position the stream (will probably be there anyway) */
277 avio_seek(pb, sample->sample_offset, SEEK_SET);
278
279 /* do a special song and dance when loading FILM Cinepak chunks */
280 if ((sample->stream == film->video_stream_index) &&
281 (film->video_type == AV_CODEC_ID_CINEPAK)) {
282 pkt->pos= avio_tell(pb);
283 if (av_new_packet(pkt, sample->sample_size))
284 return AVERROR(ENOMEM);
285 avio_read(pb, pkt->data, sample->sample_size);
286 } else if ((sample->stream == film->audio_stream_index) &&
287 (film->audio_channels == 2) &&
288 (film->audio_type != AV_CODEC_ID_ADPCM_ADX)) {
289 /* stereo PCM needs to be interleaved */
290
291 if (av_new_packet(pkt, sample->sample_size))
292 return AVERROR(ENOMEM);
293
294 /* make sure the interleave buffer is large enough */
295 if (sample->sample_size > film->stereo_buffer_size) {
296 av_free(film->stereo_buffer);
297 film->stereo_buffer_size = sample->sample_size;
298 film->stereo_buffer = av_malloc(film->stereo_buffer_size);
299 if (!film->stereo_buffer) {
300 film->stereo_buffer_size = 0;
301 return AVERROR(ENOMEM);
302 }
303 }
304
305 pkt->pos= avio_tell(pb);
306 ret = avio_read(pb, film->stereo_buffer, sample->sample_size);
307 if (ret != sample->sample_size)
308 ret = AVERROR(EIO);
309
310 left = 0;
311 right = sample->sample_size / 2;
312 for (i = 0; i < sample->sample_size; ) {
313 if (film->audio_bits == 8) {
314 pkt->data[i++] = film->stereo_buffer[left++];
315 pkt->data[i++] = film->stereo_buffer[right++];
316 } else {
317 pkt->data[i++] = film->stereo_buffer[left++];
318 pkt->data[i++] = film->stereo_buffer[left++];
319 pkt->data[i++] = film->stereo_buffer[right++];
320 pkt->data[i++] = film->stereo_buffer[right++];
321 }
322 }
323 } else {
324 ret= av_get_packet(pb, pkt, sample->sample_size);
325 if (ret != sample->sample_size)
326 ret = AVERROR(EIO);
327 }
328
329 pkt->stream_index = sample->stream;
330 pkt->pts = sample->pts;
331
332 film->current_sample++;
333
334 return ret;
335 }
336
337 AVInputFormat ff_segafilm_demuxer = {
338 .name = "film_cpk",
339 .long_name = NULL_IF_CONFIG_SMALL("Sega FILM / CPK"),
340 .priv_data_size = sizeof(FilmDemuxContext),
341 .read_probe = film_probe,
342 .read_header = film_read_header,
343 .read_packet = film_read_packet,
344 .read_close = film_read_close,
345 };