riff: fix invalid av_freep() calls on EOF in ff_read_riff_info
[libav.git] / libavformat / westwood.c
1 /*
2 * Westwood Studios Multimedia Formats Demuxer (VQA, AUD)
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 * Westwood Studios VQA & AUD file demuxers
25 * by Mike Melanson (melanson@pcisys.net)
26 * for more information on the Westwood file formats, visit:
27 * http://www.pcisys.net/~melanson/codecs/
28 * http://www.geocities.com/SiliconValley/8682/aud3.txt
29 *
30 * Implementation note: There is no definite file signature for AUD files.
31 * The demuxer uses a probabilistic strategy for content detection. This
32 * entails performing sanity checks on certain header values in order to
33 * qualify a file. Refer to wsaud_probe() for the precise parameters.
34 */
35
36 #include "libavutil/intreadwrite.h"
37 #include "avformat.h"
38 #include "internal.h"
39
40 #define AUD_HEADER_SIZE 12
41 #define AUD_CHUNK_PREAMBLE_SIZE 8
42 #define AUD_CHUNK_SIGNATURE 0x0000DEAF
43
44 #define FORM_TAG MKBETAG('F', 'O', 'R', 'M')
45 #define WVQA_TAG MKBETAG('W', 'V', 'Q', 'A')
46 #define VQHD_TAG MKBETAG('V', 'Q', 'H', 'D')
47 #define FINF_TAG MKBETAG('F', 'I', 'N', 'F')
48 #define SND0_TAG MKBETAG('S', 'N', 'D', '0')
49 #define SND1_TAG MKBETAG('S', 'N', 'D', '1')
50 #define SND2_TAG MKBETAG('S', 'N', 'D', '2')
51 #define VQFR_TAG MKBETAG('V', 'Q', 'F', 'R')
52
53 /* don't know what these tags are for, but acknowledge their existence */
54 #define CINF_TAG MKBETAG('C', 'I', 'N', 'F')
55 #define CINH_TAG MKBETAG('C', 'I', 'N', 'H')
56 #define CIND_TAG MKBETAG('C', 'I', 'N', 'D')
57 #define PINF_TAG MKBETAG('P', 'I', 'N', 'F')
58 #define PINH_TAG MKBETAG('P', 'I', 'N', 'H')
59 #define PIND_TAG MKBETAG('P', 'I', 'N', 'D')
60 #define CMDS_TAG MKBETAG('C', 'M', 'D', 'S')
61
62 #define VQA_HEADER_SIZE 0x2A
63 #define VQA_FRAMERATE 15
64 #define VQA_PREAMBLE_SIZE 8
65
66 typedef struct WsAudDemuxContext {
67 int audio_samplerate;
68 int audio_channels;
69 int audio_bits;
70 enum CodecID audio_type;
71 int audio_stream_index;
72 int64_t audio_frame_counter;
73 } WsAudDemuxContext;
74
75 typedef struct WsVqaDemuxContext {
76 int audio_samplerate;
77 int audio_channels;
78 int audio_bits;
79
80 int audio_stream_index;
81 int video_stream_index;
82
83 int64_t audio_frame_counter;
84 } WsVqaDemuxContext;
85
86 static int wsaud_probe(AVProbeData *p)
87 {
88 int field;
89
90 /* Probabilistic content detection strategy: There is no file signature
91 * so perform sanity checks on various header parameters:
92 * 8000 <= sample rate (16 bits) <= 48000 ==> 40001 acceptable numbers
93 * flags <= 0x03 (2 LSBs are used) ==> 4 acceptable numbers
94 * compression type (8 bits) = 1 or 99 ==> 2 acceptable numbers
95 * first audio chunk signature (32 bits) ==> 1 acceptable number
96 * The number space contains 2^64 numbers. There are 40001 * 4 * 2 * 1 =
97 * 320008 acceptable number combinations.
98 */
99
100 if (p->buf_size < AUD_HEADER_SIZE + AUD_CHUNK_PREAMBLE_SIZE)
101 return 0;
102
103 /* check sample rate */
104 field = AV_RL16(&p->buf[0]);
105 if ((field < 8000) || (field > 48000))
106 return 0;
107
108 /* enforce the rule that the top 6 bits of this flags field are reserved (0);
109 * this might not be true, but enforce it until deemed unnecessary */
110 if (p->buf[10] & 0xFC)
111 return 0;
112
113 /* note: only check for WS IMA (type 99) right now since there is no
114 * support for type 1 */
115 if (p->buf[11] != 99)
116 return 0;
117
118 /* read ahead to the first audio chunk and validate the first header signature */
119 if (AV_RL32(&p->buf[16]) != AUD_CHUNK_SIGNATURE)
120 return 0;
121
122 /* return 1/2 certainty since this file check is a little sketchy */
123 return AVPROBE_SCORE_MAX / 2;
124 }
125
126 static int wsaud_read_header(AVFormatContext *s,
127 AVFormatParameters *ap)
128 {
129 WsAudDemuxContext *wsaud = s->priv_data;
130 AVIOContext *pb = s->pb;
131 AVStream *st;
132 unsigned char header[AUD_HEADER_SIZE];
133
134 if (avio_read(pb, header, AUD_HEADER_SIZE) != AUD_HEADER_SIZE)
135 return AVERROR(EIO);
136 wsaud->audio_samplerate = AV_RL16(&header[0]);
137 if (header[11] == 99)
138 wsaud->audio_type = CODEC_ID_ADPCM_IMA_WS;
139 else
140 return AVERROR_INVALIDDATA;
141
142 /* flag 0 indicates stereo */
143 wsaud->audio_channels = (header[10] & 0x1) + 1;
144 /* flag 1 indicates 16 bit audio */
145 wsaud->audio_bits = (((header[10] & 0x2) >> 1) + 1) * 8;
146
147 /* initialize the audio decoder stream */
148 st = avformat_new_stream(s, NULL);
149 if (!st)
150 return AVERROR(ENOMEM);
151 avpriv_set_pts_info(st, 33, 1, wsaud->audio_samplerate);
152 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
153 st->codec->codec_id = wsaud->audio_type;
154 st->codec->codec_tag = 0; /* no tag */
155 st->codec->channels = wsaud->audio_channels;
156 st->codec->sample_rate = wsaud->audio_samplerate;
157 st->codec->bits_per_coded_sample = wsaud->audio_bits;
158 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
159 st->codec->bits_per_coded_sample / 4;
160 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
161
162 wsaud->audio_stream_index = st->index;
163 wsaud->audio_frame_counter = 0;
164
165 return 0;
166 }
167
168 static int wsaud_read_packet(AVFormatContext *s,
169 AVPacket *pkt)
170 {
171 WsAudDemuxContext *wsaud = s->priv_data;
172 AVIOContext *pb = s->pb;
173 unsigned char preamble[AUD_CHUNK_PREAMBLE_SIZE];
174 unsigned int chunk_size;
175 int ret = 0;
176
177 if (avio_read(pb, preamble, AUD_CHUNK_PREAMBLE_SIZE) !=
178 AUD_CHUNK_PREAMBLE_SIZE)
179 return AVERROR(EIO);
180
181 /* validate the chunk */
182 if (AV_RL32(&preamble[4]) != AUD_CHUNK_SIGNATURE)
183 return AVERROR_INVALIDDATA;
184
185 chunk_size = AV_RL16(&preamble[0]);
186 ret= av_get_packet(pb, pkt, chunk_size);
187 if (ret != chunk_size)
188 return AVERROR(EIO);
189 pkt->stream_index = wsaud->audio_stream_index;
190 pkt->pts = wsaud->audio_frame_counter;
191 pkt->pts /= wsaud->audio_samplerate;
192
193 /* 2 samples/byte, 1 or 2 samples per frame depending on stereo */
194 wsaud->audio_frame_counter += (chunk_size * 2) / wsaud->audio_channels;
195
196 return ret;
197 }
198
199 static int wsvqa_probe(AVProbeData *p)
200 {
201 /* need 12 bytes to qualify */
202 if (p->buf_size < 12)
203 return 0;
204
205 /* check for the VQA signatures */
206 if ((AV_RB32(&p->buf[0]) != FORM_TAG) ||
207 (AV_RB32(&p->buf[8]) != WVQA_TAG))
208 return 0;
209
210 return AVPROBE_SCORE_MAX;
211 }
212
213 static int wsvqa_read_header(AVFormatContext *s,
214 AVFormatParameters *ap)
215 {
216 WsVqaDemuxContext *wsvqa = s->priv_data;
217 AVIOContext *pb = s->pb;
218 AVStream *st;
219 unsigned char *header;
220 unsigned char scratch[VQA_PREAMBLE_SIZE];
221 unsigned int chunk_tag;
222 unsigned int chunk_size;
223
224 /* initialize the video decoder stream */
225 st = avformat_new_stream(s, NULL);
226 if (!st)
227 return AVERROR(ENOMEM);
228 avpriv_set_pts_info(st, 33, 1, VQA_FRAMERATE);
229 wsvqa->video_stream_index = st->index;
230 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
231 st->codec->codec_id = CODEC_ID_WS_VQA;
232 st->codec->codec_tag = 0; /* no fourcc */
233
234 /* skip to the start of the VQA header */
235 avio_seek(pb, 20, SEEK_SET);
236
237 /* the VQA header needs to go to the decoder */
238 st->codec->extradata_size = VQA_HEADER_SIZE;
239 st->codec->extradata = av_mallocz(VQA_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
240 header = (unsigned char *)st->codec->extradata;
241 if (avio_read(pb, st->codec->extradata, VQA_HEADER_SIZE) !=
242 VQA_HEADER_SIZE) {
243 av_free(st->codec->extradata);
244 return AVERROR(EIO);
245 }
246 st->codec->width = AV_RL16(&header[6]);
247 st->codec->height = AV_RL16(&header[8]);
248
249 /* initialize the audio decoder stream for VQA v1 or nonzero samplerate */
250 if (AV_RL16(&header[24]) || (AV_RL16(&header[0]) == 1 && AV_RL16(&header[2]) == 1)) {
251 st = avformat_new_stream(s, NULL);
252 if (!st)
253 return AVERROR(ENOMEM);
254 avpriv_set_pts_info(st, 33, 1, VQA_FRAMERATE);
255 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
256 if (AV_RL16(&header[0]) == 1)
257 st->codec->codec_id = CODEC_ID_WESTWOOD_SND1;
258 else
259 st->codec->codec_id = CODEC_ID_ADPCM_IMA_WS;
260 st->codec->codec_tag = 0; /* no tag */
261 st->codec->sample_rate = AV_RL16(&header[24]);
262 if (!st->codec->sample_rate)
263 st->codec->sample_rate = 22050;
264 st->codec->channels = header[26];
265 if (!st->codec->channels)
266 st->codec->channels = 1;
267 st->codec->bits_per_coded_sample = 16;
268 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
269 st->codec->bits_per_coded_sample / 4;
270 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
271
272 wsvqa->audio_stream_index = st->index;
273 wsvqa->audio_samplerate = st->codec->sample_rate;
274 wsvqa->audio_channels = st->codec->channels;
275 wsvqa->audio_frame_counter = 0;
276 }
277
278 /* there are 0 or more chunks before the FINF chunk; iterate until
279 * FINF has been skipped and the file will be ready to be demuxed */
280 do {
281 if (avio_read(pb, scratch, VQA_PREAMBLE_SIZE) != VQA_PREAMBLE_SIZE) {
282 av_free(st->codec->extradata);
283 return AVERROR(EIO);
284 }
285 chunk_tag = AV_RB32(&scratch[0]);
286 chunk_size = AV_RB32(&scratch[4]);
287
288 /* catch any unknown header tags, for curiousity */
289 switch (chunk_tag) {
290 case CINF_TAG:
291 case CINH_TAG:
292 case CIND_TAG:
293 case PINF_TAG:
294 case PINH_TAG:
295 case PIND_TAG:
296 case FINF_TAG:
297 case CMDS_TAG:
298 break;
299
300 default:
301 av_log (s, AV_LOG_ERROR, " note: unknown chunk seen (%c%c%c%c)\n",
302 scratch[0], scratch[1],
303 scratch[2], scratch[3]);
304 break;
305 }
306
307 avio_skip(pb, chunk_size);
308 } while (chunk_tag != FINF_TAG);
309
310 return 0;
311 }
312
313 static int wsvqa_read_packet(AVFormatContext *s,
314 AVPacket *pkt)
315 {
316 WsVqaDemuxContext *wsvqa = s->priv_data;
317 AVIOContext *pb = s->pb;
318 int ret = -1;
319 unsigned char preamble[VQA_PREAMBLE_SIZE];
320 unsigned int chunk_type;
321 unsigned int chunk_size;
322 int skip_byte;
323
324 while (avio_read(pb, preamble, VQA_PREAMBLE_SIZE) == VQA_PREAMBLE_SIZE) {
325 chunk_type = AV_RB32(&preamble[0]);
326 chunk_size = AV_RB32(&preamble[4]);
327 skip_byte = chunk_size & 0x01;
328
329 if ((chunk_type == SND2_TAG || chunk_type == SND1_TAG) && wsvqa->audio_channels == 0) {
330 av_log(s, AV_LOG_ERROR, "audio chunk without any audio header information found\n");
331 return AVERROR_INVALIDDATA;
332 }
333
334 if ((chunk_type == SND1_TAG) || (chunk_type == SND2_TAG) || (chunk_type == VQFR_TAG)) {
335
336 if (av_new_packet(pkt, chunk_size))
337 return AVERROR(EIO);
338 ret = avio_read(pb, pkt->data, chunk_size);
339 if (ret != chunk_size) {
340 av_free_packet(pkt);
341 return AVERROR(EIO);
342 }
343
344 if (chunk_type == SND2_TAG) {
345 pkt->stream_index = wsvqa->audio_stream_index;
346 /* 2 samples/byte, 1 or 2 samples per frame depending on stereo */
347 wsvqa->audio_frame_counter += (chunk_size * 2) / wsvqa->audio_channels;
348 } else if(chunk_type == SND1_TAG) {
349 pkt->stream_index = wsvqa->audio_stream_index;
350 /* unpacked size is stored in header */
351 wsvqa->audio_frame_counter += AV_RL16(pkt->data) / wsvqa->audio_channels;
352 } else {
353 pkt->stream_index = wsvqa->video_stream_index;
354 }
355 /* stay on 16-bit alignment */
356 if (skip_byte)
357 avio_skip(pb, 1);
358
359 return ret;
360 } else {
361 switch(chunk_type){
362 case CMDS_TAG:
363 case SND0_TAG:
364 break;
365 default:
366 av_log(s, AV_LOG_INFO, "Skipping unknown chunk 0x%08X\n", chunk_type);
367 }
368 avio_skip(pb, chunk_size + skip_byte);
369 }
370 }
371
372 return ret;
373 }
374
375 #if CONFIG_WSAUD_DEMUXER
376 AVInputFormat ff_wsaud_demuxer = {
377 .name = "wsaud",
378 .long_name = NULL_IF_CONFIG_SMALL("Westwood Studios audio format"),
379 .priv_data_size = sizeof(WsAudDemuxContext),
380 .read_probe = wsaud_probe,
381 .read_header = wsaud_read_header,
382 .read_packet = wsaud_read_packet,
383 };
384 #endif
385 #if CONFIG_WSVQA_DEMUXER
386 AVInputFormat ff_wsvqa_demuxer = {
387 .name = "wsvqa",
388 .long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA format"),
389 .priv_data_size = sizeof(WsVqaDemuxContext),
390 .read_probe = wsvqa_probe,
391 .read_header = wsvqa_read_header,
392 .read_packet = wsvqa_read_packet,
393 };
394 #endif