fixed double free
[libav.git] / libavformat / wav.c
CommitLineData
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1/*
2 * WAV encoder and decoder
e095026a 3 * Copyright (c) 2001, 2002 Fabrice Bellard.
de6d9b64 4 *
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5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
de6d9b64 9 *
19720f15 10 * This library is distributed in the hope that it will be useful,
de6d9b64 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
de6d9b64 14 *
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15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
de6d9b64 18 */
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19#include "avformat.h"
20#include "avi.h"
21
e8c00089 22const CodecTag codec_wav_tags[] = {
46a3d068 23 { CODEC_ID_MP2, 0x50 },
80783dc2 24 { CODEC_ID_MP3, 0x55 },
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25 { CODEC_ID_AC3, 0x2000 },
26 { CODEC_ID_PCM_S16LE, 0x01 },
27 { CODEC_ID_PCM_U8, 0x01 }, /* must come after s16le in this list */
28 { CODEC_ID_PCM_ALAW, 0x06 },
29 { CODEC_ID_PCM_MULAW, 0x07 },
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30 { CODEC_ID_ADPCM_MS, 0x02 },
31 { CODEC_ID_ADPCM_IMA_WAV, 0x11 },
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32 { CODEC_ID_ADPCM_IMA_DK4, 0x61 }, /* rogue format number */
33 { CODEC_ID_ADPCM_IMA_DK3, 0x62 }, /* rogue format number */
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34 { CODEC_ID_WMAV1, 0x160 },
35 { CODEC_ID_WMAV2, 0x161 },
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36 { 0, 0 },
37};
38
764ef400 39#ifdef CONFIG_ENCODERS
46a3d068 40/* WAVEFORMATEX header */
afc25d93 41/* returns the size or -1 on error */
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42int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
43{
bd5a6020 44 int bps, blkalign, bytespersec;
afc25d93 45 int hdrsize = 18;
46a3d068 46
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47 if(!enc->codec_tag)
48 enc->codec_tag = codec_get_tag(codec_wav_tags, enc->codec_id);
49 if(!enc->codec_tag)
46a3d068 50 return -1;
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51
52 put_le16(pb, enc->codec_tag);
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53 put_le16(pb, enc->channels);
54 put_le32(pb, enc->sample_rate);
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55 if (enc->codec_id == CODEC_ID_PCM_U8 ||
56 enc->codec_id == CODEC_ID_PCM_ALAW ||
57 enc->codec_id == CODEC_ID_PCM_MULAW) {
58 bps = 8;
80783dc2 59 } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
86bec9a1 60 bps = 0;
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61 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV || enc->codec_id == CODEC_ID_ADPCM_MS) {
62 bps = 4;
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63 } else {
64 bps = 16;
65 }
46a3d068 66
80783dc2 67 if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
86bec9a1 68 blkalign = 1;
4b1f4f23 69 //blkalign = 144 * enc->bit_rate/enc->sample_rate;
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70 } else if (enc->block_align != 0) { /* specified by the codec */
71 blkalign = enc->block_align;
4b1f4f23 72 } else
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73 blkalign = enc->channels*bps >> 3;
74 if (enc->codec_id == CODEC_ID_PCM_U8 ||
75 enc->codec_id == CODEC_ID_PCM_S16LE) {
76 bytespersec = enc->sample_rate * blkalign;
77 } else {
78 bytespersec = enc->bit_rate / 8;
79 }
80 put_le32(pb, bytespersec); /* bytes per second */
81 put_le16(pb, blkalign); /* block align */
82 put_le16(pb, bps); /* bits per sample */
80783dc2 83 if (enc->codec_id == CODEC_ID_MP3) {
86bec9a1 84 put_le16(pb, 12); /* wav_extra_size */
afc25d93 85 hdrsize += 12;
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86 put_le16(pb, 1); /* wID */
87 put_le32(pb, 2); /* fdwFlags */
88 put_le16(pb, 1152); /* nBlockSize */
89 put_le16(pb, 1); /* nFramesPerBlock */
90 put_le16(pb, 1393); /* nCodecDelay */
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91 } else if (enc->codec_id == CODEC_ID_MP2) {
92 put_le16(pb, 22); /* wav_extra_size */
afc25d93 93 hdrsize += 22;
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94 put_le16(pb, 2); /* fwHeadLayer */
95 put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
96 put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
97 put_le16(pb, 0); /* fwHeadModeExt */
98 put_le16(pb, 1); /* wHeadEmphasis */
99 put_le16(pb, 16); /* fwHeadFlags */
100 put_le32(pb, 0); /* dwPTSLow */
101 put_le32(pb, 0); /* dwPTSHigh */
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102 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
103 put_le16(pb, 2); /* wav_extra_size */
104 put_le16(pb, ((enc->block_align - 4 * enc->channels) / (4 * enc->channels)) * 8 + 1); /* wSamplesPerBlock */
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105 } else
106 put_le16(pb, 0); /* wav_extra_size */
107
afc25d93 108 return hdrsize;
46a3d068 109}
764ef400 110#endif //CONFIG_ENCODERS
46a3d068 111
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112/* We could be given one of the three possible structures here:
113 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
114 * is an expansion of the previous one with the fields added
115 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
116 * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
117 * an openended structure.
118 */
119void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
e095026a 120{
e8c00089 121 int id;
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122
123 id = get_le16(pb);
124 codec->codec_type = CODEC_TYPE_AUDIO;
125 codec->codec_tag = id;
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126 codec->channels = get_le16(pb);
127 codec->sample_rate = get_le32(pb);
128 codec->bit_rate = get_le32(pb) * 8;
129 codec->block_align = get_le16(pb);
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130 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
131 codec->bits_per_sample = 8;
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132 }else
133 codec->bits_per_sample = get_le16(pb);
134 codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
135
2e7973bb 136 if (size > 16) { /* We're obviously dealing with WAVEFORMATEX */
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137 codec->extradata_size = get_le16(pb);
138 if (codec->extradata_size > 0) {
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139 if (codec->extradata_size > size - 18)
140 codec->extradata_size = size - 18;
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141 codec->extradata = av_mallocz(codec->extradata_size);
142 get_buffer(pb, codec->extradata, codec->extradata_size);
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143 } else
144 codec->extradata_size = 0;
145
146 /* It is possible for the chunk to contain garbage at the end */
147 if (size - codec->extradata_size - 18 > 0)
148 url_fskip(pb, size - codec->extradata_size - 18);
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149 }
150}
151
152
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153int wav_codec_get_id(unsigned int tag, int bps)
154{
155 int id;
156 id = codec_get_id(codec_wav_tags, tag);
157 if (id <= 0)
158 return id;
159 /* handle specific u8 codec */
160 if (id == CODEC_ID_PCM_S16LE && bps == 8)
161 id = CODEC_ID_PCM_U8;
162 return id;
163}
164
764ef400 165#ifdef CONFIG_ENCODERS
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166typedef struct {
167 offset_t data;
168} WAVContext;
169
170static int wav_write_header(AVFormatContext *s)
171{
c9a65ca8 172 WAVContext *wav = s->priv_data;
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173 ByteIOContext *pb = &s->pb;
174 offset_t fmt;
175
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176 put_tag(pb, "RIFF");
177 put_le32(pb, 0); /* file length */
178 put_tag(pb, "WAVE");
179
180 /* format header */
181 fmt = start_tag(pb, "fmt ");
46a3d068 182 if (put_wav_header(pb, &s->streams[0]->codec) < 0) {
1ea4f593 183 av_free(wav);
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184 return -1;
185 }
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186 end_tag(pb, fmt);
187
188 /* data header */
189 wav->data = start_tag(pb, "data");
190
191 put_flush_packet(pb);
192
193 return 0;
194}
195
196static int wav_write_packet(AVFormatContext *s, int stream_index_ptr,
49057904 197 const uint8_t *buf, int size, int64_t pts)
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198{
199 ByteIOContext *pb = &s->pb;
200 put_buffer(pb, buf, size);
201 return 0;
202}
203
204static int wav_write_trailer(AVFormatContext *s)
205{
206 ByteIOContext *pb = &s->pb;
207 WAVContext *wav = s->priv_data;
208 offset_t file_size;
209
210 if (!url_is_streamed(&s->pb)) {
211 end_tag(pb, wav->data);
212
213 /* update file size */
214 file_size = url_ftell(pb);
215 url_fseek(pb, 4, SEEK_SET);
0c1a9eda 216 put_le32(pb, (uint32_t)(file_size - 8));
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217 url_fseek(pb, file_size, SEEK_SET);
218
219 put_flush_packet(pb);
220 }
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221 return 0;
222}
764ef400 223#endif //CONFIG_ENCODERS
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224
225/* return the size of the found tag */
226/* XXX: > 2GB ? */
0c1a9eda 227static int find_tag(ByteIOContext *pb, uint32_t tag1)
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228{
229 unsigned int tag;
230 int size;
231
232 for(;;) {
233 if (url_feof(pb))
234 return -1;
235 tag = get_le32(pb);
236 size = get_le32(pb);
237 if (tag == tag1)
238 break;
239 url_fseek(pb, size, SEEK_CUR);
240 }
241 if (size < 0)
242 size = 0x7fffffff;
243 return size;
244}
245
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246static int wav_probe(AVProbeData *p)
247{
248 /* check file header */
249 if (p->buf_size <= 32)
250 return 0;
251 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
252 p->buf[2] == 'F' && p->buf[3] == 'F' &&
253 p->buf[8] == 'W' && p->buf[9] == 'A' &&
254 p->buf[10] == 'V' && p->buf[11] == 'E')
255 return AVPROBE_SCORE_MAX;
256 else
257 return 0;
258}
259
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260/* wav input */
261static int wav_read_header(AVFormatContext *s,
262 AVFormatParameters *ap)
263{
264 int size;
265 unsigned int tag;
266 ByteIOContext *pb = &s->pb;
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267 AVStream *st;
268
269 /* check RIFF header */
270 tag = get_le32(pb);
271
272 if (tag != MKTAG('R', 'I', 'F', 'F'))
273 return -1;
274 get_le32(pb); /* file size */
275 tag = get_le32(pb);
276 if (tag != MKTAG('W', 'A', 'V', 'E'))
277 return -1;
278
279 /* parse fmt header */
280 size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
281 if (size < 0)
282 return -1;
c9a65ca8 283 st = av_new_stream(s, 0);
de6d9b64 284 if (!st)
c9a65ca8 285 return AVERROR_NOMEM;
de6d9b64 286
2e7973bb 287 get_wav_header(pb, &st->codec, size);
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288
289 size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
290 if (size < 0)
291 return -1;
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292 return 0;
293}
294
295#define MAX_SIZE 4096
296
297static int wav_read_packet(AVFormatContext *s,
298 AVPacket *pkt)
299{
94ef6864 300 int ret;
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301
302 if (url_feof(&s->pb))
303 return -EIO;
94ef6864 304 if (av_new_packet(pkt, MAX_SIZE))
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305 return -EIO;
306 pkt->stream_index = 0;
307
308 ret = get_buffer(&s->pb, pkt->data, pkt->size);
309 if (ret < 0)
310 av_free_packet(pkt);
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311 /* note: we need to modify the packet size here to handle the last
312 packet */
313 pkt->size = ret;
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314 return ret;
315}
316
317static int wav_read_close(AVFormatContext *s)
318{
319 return 0;
320}
321
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322static AVInputFormat wav_iformat = {
323 "wav",
324 "wav format",
325 0,
326 wav_probe,
327 wav_read_header,
328 wav_read_packet,
329 wav_read_close,
330};
331
764ef400 332#ifdef CONFIG_ENCODERS
c9a65ca8 333static AVOutputFormat wav_oformat = {
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334 "wav",
335 "wav format",
336 "audio/x-wav",
337 "wav",
c9a65ca8 338 sizeof(WAVContext),
5ed8fafc 339 CODEC_ID_PCM_S16LE,
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340 CODEC_ID_NONE,
341 wav_write_header,
342 wav_write_packet,
343 wav_write_trailer,
de6d9b64 344};
764ef400 345#endif //CONFIG_ENCODERS
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346
347int wav_init(void)
348{
349 av_register_input_format(&wav_iformat);
764ef400 350#ifdef CONFIG_ENCODERS
c9a65ca8 351 av_register_output_format(&wav_oformat);
764ef400 352#endif //CONFIG_ENCODERS
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353 return 0;
354}