fix the case where all vlc codes are 8 bits long (repeat=256)
[libav.git] / libavformat / wav.c
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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
39/* WAVEFORMATEX header */
afc25d93 40/* returns the size or -1 on error */
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41int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
42{
bd5a6020 43 int bps, blkalign, bytespersec;
afc25d93 44 int hdrsize = 18;
46a3d068 45
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46 if(!enc->codec_tag)
47 enc->codec_tag = codec_get_tag(codec_wav_tags, enc->codec_id);
48 if(!enc->codec_tag)
46a3d068 49 return -1;
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50
51 put_le16(pb, enc->codec_tag);
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52 put_le16(pb, enc->channels);
53 put_le32(pb, enc->sample_rate);
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54 if (enc->codec_id == CODEC_ID_PCM_U8 ||
55 enc->codec_id == CODEC_ID_PCM_ALAW ||
56 enc->codec_id == CODEC_ID_PCM_MULAW) {
57 bps = 8;
80783dc2 58 } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
86bec9a1 59 bps = 0;
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60 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV || enc->codec_id == CODEC_ID_ADPCM_MS) {
61 bps = 4;
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62 } else {
63 bps = 16;
64 }
46a3d068 65
80783dc2 66 if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
86bec9a1 67 blkalign = 1;
4b1f4f23 68 //blkalign = 144 * enc->bit_rate/enc->sample_rate;
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69 } else if (enc->block_align != 0) { /* specified by the codec */
70 blkalign = enc->block_align;
4b1f4f23 71 } else
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72 blkalign = enc->channels*bps >> 3;
73 if (enc->codec_id == CODEC_ID_PCM_U8 ||
74 enc->codec_id == CODEC_ID_PCM_S16LE) {
75 bytespersec = enc->sample_rate * blkalign;
76 } else {
77 bytespersec = enc->bit_rate / 8;
78 }
79 put_le32(pb, bytespersec); /* bytes per second */
80 put_le16(pb, blkalign); /* block align */
81 put_le16(pb, bps); /* bits per sample */
80783dc2 82 if (enc->codec_id == CODEC_ID_MP3) {
86bec9a1 83 put_le16(pb, 12); /* wav_extra_size */
afc25d93 84 hdrsize += 12;
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85 put_le16(pb, 1); /* wID */
86 put_le32(pb, 2); /* fdwFlags */
87 put_le16(pb, 1152); /* nBlockSize */
88 put_le16(pb, 1); /* nFramesPerBlock */
89 put_le16(pb, 1393); /* nCodecDelay */
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90 } else if (enc->codec_id == CODEC_ID_MP2) {
91 put_le16(pb, 22); /* wav_extra_size */
afc25d93 92 hdrsize += 22;
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93 put_le16(pb, 2); /* fwHeadLayer */
94 put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
95 put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
96 put_le16(pb, 0); /* fwHeadModeExt */
97 put_le16(pb, 1); /* wHeadEmphasis */
98 put_le16(pb, 16); /* fwHeadFlags */
99 put_le32(pb, 0); /* dwPTSLow */
100 put_le32(pb, 0); /* dwPTSHigh */
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101 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
102 put_le16(pb, 2); /* wav_extra_size */
103 put_le16(pb, ((enc->block_align - 4 * enc->channels) / (4 * enc->channels)) * 8 + 1); /* wSamplesPerBlock */
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104 } else
105 put_le16(pb, 0); /* wav_extra_size */
106
afc25d93 107 return hdrsize;
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108}
109
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110/* We could be given one of the three possible structures here:
111 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
112 * is an expansion of the previous one with the fields added
113 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
114 * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
115 * an openended structure.
116 */
117void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
e095026a 118{
e8c00089 119 int id;
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120
121 id = get_le16(pb);
122 codec->codec_type = CODEC_TYPE_AUDIO;
123 codec->codec_tag = id;
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124 codec->channels = get_le16(pb);
125 codec->sample_rate = get_le32(pb);
126 codec->bit_rate = get_le32(pb) * 8;
127 codec->block_align = get_le16(pb);
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128 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
129 codec->bits_per_sample = 8;
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130 }else
131 codec->bits_per_sample = get_le16(pb);
132 codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
133
2e7973bb 134 if (size > 16) { /* We're obviously dealing with WAVEFORMATEX */
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135 codec->extradata_size = get_le16(pb);
136 if (codec->extradata_size > 0) {
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137 if (codec->extradata_size > size - 18)
138 codec->extradata_size = size - 18;
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139 codec->extradata = av_mallocz(codec->extradata_size);
140 get_buffer(pb, codec->extradata, codec->extradata_size);
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141 } else
142 codec->extradata_size = 0;
143
144 /* It is possible for the chunk to contain garbage at the end */
145 if (size - codec->extradata_size - 18 > 0)
146 url_fskip(pb, size - codec->extradata_size - 18);
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147 }
148}
149
150
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151int wav_codec_get_id(unsigned int tag, int bps)
152{
153 int id;
154 id = codec_get_id(codec_wav_tags, tag);
155 if (id <= 0)
156 return id;
157 /* handle specific u8 codec */
158 if (id == CODEC_ID_PCM_S16LE && bps == 8)
159 id = CODEC_ID_PCM_U8;
160 return id;
161}
162
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163typedef struct {
164 offset_t data;
165} WAVContext;
166
167static int wav_write_header(AVFormatContext *s)
168{
c9a65ca8 169 WAVContext *wav = s->priv_data;
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170 ByteIOContext *pb = &s->pb;
171 offset_t fmt;
172
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173 put_tag(pb, "RIFF");
174 put_le32(pb, 0); /* file length */
175 put_tag(pb, "WAVE");
176
177 /* format header */
178 fmt = start_tag(pb, "fmt ");
46a3d068 179 if (put_wav_header(pb, &s->streams[0]->codec) < 0) {
1ea4f593 180 av_free(wav);
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181 return -1;
182 }
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183 end_tag(pb, fmt);
184
185 /* data header */
186 wav->data = start_tag(pb, "data");
187
188 put_flush_packet(pb);
189
190 return 0;
191}
192
193static int wav_write_packet(AVFormatContext *s, int stream_index_ptr,
49057904 194 const uint8_t *buf, int size, int64_t pts)
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195{
196 ByteIOContext *pb = &s->pb;
197 put_buffer(pb, buf, size);
198 return 0;
199}
200
201static int wav_write_trailer(AVFormatContext *s)
202{
203 ByteIOContext *pb = &s->pb;
204 WAVContext *wav = s->priv_data;
205 offset_t file_size;
206
207 if (!url_is_streamed(&s->pb)) {
208 end_tag(pb, wav->data);
209
210 /* update file size */
211 file_size = url_ftell(pb);
212 url_fseek(pb, 4, SEEK_SET);
0c1a9eda 213 put_le32(pb, (uint32_t)(file_size - 8));
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214 url_fseek(pb, file_size, SEEK_SET);
215
216 put_flush_packet(pb);
217 }
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218 return 0;
219}
220
221/* return the size of the found tag */
222/* XXX: > 2GB ? */
0c1a9eda 223static int find_tag(ByteIOContext *pb, uint32_t tag1)
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224{
225 unsigned int tag;
226 int size;
227
228 for(;;) {
229 if (url_feof(pb))
230 return -1;
231 tag = get_le32(pb);
232 size = get_le32(pb);
233 if (tag == tag1)
234 break;
235 url_fseek(pb, size, SEEK_CUR);
236 }
237 if (size < 0)
238 size = 0x7fffffff;
239 return size;
240}
241
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242static int wav_probe(AVProbeData *p)
243{
244 /* check file header */
245 if (p->buf_size <= 32)
246 return 0;
247 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
248 p->buf[2] == 'F' && p->buf[3] == 'F' &&
249 p->buf[8] == 'W' && p->buf[9] == 'A' &&
250 p->buf[10] == 'V' && p->buf[11] == 'E')
251 return AVPROBE_SCORE_MAX;
252 else
253 return 0;
254}
255
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256/* wav input */
257static int wav_read_header(AVFormatContext *s,
258 AVFormatParameters *ap)
259{
260 int size;
261 unsigned int tag;
262 ByteIOContext *pb = &s->pb;
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263 AVStream *st;
264
265 /* check RIFF header */
266 tag = get_le32(pb);
267
268 if (tag != MKTAG('R', 'I', 'F', 'F'))
269 return -1;
270 get_le32(pb); /* file size */
271 tag = get_le32(pb);
272 if (tag != MKTAG('W', 'A', 'V', 'E'))
273 return -1;
274
275 /* parse fmt header */
276 size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
277 if (size < 0)
278 return -1;
c9a65ca8 279 st = av_new_stream(s, 0);
de6d9b64 280 if (!st)
c9a65ca8 281 return AVERROR_NOMEM;
de6d9b64 282
2e7973bb 283 get_wav_header(pb, &st->codec, size);
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284
285 size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
286 if (size < 0)
287 return -1;
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288 return 0;
289}
290
291#define MAX_SIZE 4096
292
293static int wav_read_packet(AVFormatContext *s,
294 AVPacket *pkt)
295{
94ef6864 296 int ret;
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297
298 if (url_feof(&s->pb))
299 return -EIO;
94ef6864 300 if (av_new_packet(pkt, MAX_SIZE))
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301 return -EIO;
302 pkt->stream_index = 0;
303
304 ret = get_buffer(&s->pb, pkt->data, pkt->size);
305 if (ret < 0)
306 av_free_packet(pkt);
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307 /* note: we need to modify the packet size here to handle the last
308 packet */
309 pkt->size = ret;
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310 return ret;
311}
312
313static int wav_read_close(AVFormatContext *s)
314{
315 return 0;
316}
317
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318static AVInputFormat wav_iformat = {
319 "wav",
320 "wav format",
321 0,
322 wav_probe,
323 wav_read_header,
324 wav_read_packet,
325 wav_read_close,
326};
327
328static AVOutputFormat wav_oformat = {
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329 "wav",
330 "wav format",
331 "audio/x-wav",
332 "wav",
c9a65ca8 333 sizeof(WAVContext),
5ed8fafc 334 CODEC_ID_PCM_S16LE,
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335 CODEC_ID_NONE,
336 wav_write_header,
337 wav_write_packet,
338 wav_write_trailer,
de6d9b64 339};
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340
341int wav_init(void)
342{
343 av_register_input_format(&wav_iformat);
344 av_register_output_format(&wav_oformat);
345 return 0;
346}