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de6d9b64 FB |
1 | /* |
2 | * WAV encoder and decoder | |
3 | * Copyright (c) 2001 Gerard Lantau. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | */ | |
de6d9b64 FB |
19 | #include "avformat.h" |
20 | #include "avi.h" | |
21 | ||
46a3d068 | 22 | CodecTag codec_wav_tags[] = { |
46a3d068 | 23 | { CODEC_ID_MP2, 0x50 }, |
4b1f4f23 | 24 | { CODEC_ID_MP3LAME, 0x55 }, |
46a3d068 FB |
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 }, | |
30 | { 0, 0 }, | |
31 | }; | |
32 | ||
33 | /* WAVEFORMATEX header */ | |
afc25d93 | 34 | /* returns the size or -1 on error */ |
46a3d068 FB |
35 | int put_wav_header(ByteIOContext *pb, AVCodecContext *enc) |
36 | { | |
86bec9a1 | 37 | int tag, bps, blkalign, bytespersec; |
afc25d93 | 38 | int hdrsize = 18; |
46a3d068 FB |
39 | |
40 | tag = codec_get_tag(codec_wav_tags, enc->codec_id); | |
41 | if (tag == 0) | |
42 | return -1; | |
4b1f4f23 | 43 | put_le16(pb, tag); |
46a3d068 FB |
44 | put_le16(pb, enc->channels); |
45 | put_le32(pb, enc->sample_rate); | |
46a3d068 FB |
46 | if (enc->codec_id == CODEC_ID_PCM_U8 || |
47 | enc->codec_id == CODEC_ID_PCM_ALAW || | |
48 | enc->codec_id == CODEC_ID_PCM_MULAW) { | |
49 | bps = 8; | |
5798368b | 50 | } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3LAME) { |
86bec9a1 | 51 | bps = 0; |
46a3d068 FB |
52 | } else { |
53 | bps = 16; | |
54 | } | |
46a3d068 | 55 | |
4b1f4f23 | 56 | if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3LAME) { |
86bec9a1 | 57 | blkalign = 1; |
4b1f4f23 J |
58 | //blkalign = 144 * enc->bit_rate/enc->sample_rate; |
59 | } else | |
86bec9a1 J |
60 | blkalign = enc->channels*bps >> 3; |
61 | if (enc->codec_id == CODEC_ID_PCM_U8 || | |
62 | enc->codec_id == CODEC_ID_PCM_S16LE) { | |
63 | bytespersec = enc->sample_rate * blkalign; | |
64 | } else { | |
65 | bytespersec = enc->bit_rate / 8; | |
66 | } | |
67 | put_le32(pb, bytespersec); /* bytes per second */ | |
68 | put_le16(pb, blkalign); /* block align */ | |
69 | put_le16(pb, bps); /* bits per sample */ | |
4b1f4f23 | 70 | if (enc->codec_id == CODEC_ID_MP3LAME) { |
86bec9a1 | 71 | put_le16(pb, 12); /* wav_extra_size */ |
afc25d93 | 72 | hdrsize += 12; |
86bec9a1 J |
73 | put_le16(pb, 1); /* wID */ |
74 | put_le32(pb, 2); /* fdwFlags */ | |
75 | put_le16(pb, 1152); /* nBlockSize */ | |
76 | put_le16(pb, 1); /* nFramesPerBlock */ | |
77 | put_le16(pb, 1393); /* nCodecDelay */ | |
4b1f4f23 J |
78 | } else if (enc->codec_id == CODEC_ID_MP2) { |
79 | put_le16(pb, 22); /* wav_extra_size */ | |
afc25d93 | 80 | hdrsize += 22; |
4b1f4f23 J |
81 | put_le16(pb, 2); /* fwHeadLayer */ |
82 | put_le32(pb, enc->bit_rate); /* dwHeadBitrate */ | |
83 | put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */ | |
84 | put_le16(pb, 0); /* fwHeadModeExt */ | |
85 | put_le16(pb, 1); /* wHeadEmphasis */ | |
86 | put_le16(pb, 16); /* fwHeadFlags */ | |
87 | put_le32(pb, 0); /* dwPTSLow */ | |
88 | put_le32(pb, 0); /* dwPTSHigh */ | |
86bec9a1 J |
89 | } else |
90 | put_le16(pb, 0); /* wav_extra_size */ | |
91 | ||
afc25d93 | 92 | return hdrsize; |
46a3d068 FB |
93 | } |
94 | ||
95 | int wav_codec_get_id(unsigned int tag, int bps) | |
96 | { | |
97 | int id; | |
98 | id = codec_get_id(codec_wav_tags, tag); | |
99 | if (id <= 0) | |
100 | return id; | |
101 | /* handle specific u8 codec */ | |
102 | if (id == CODEC_ID_PCM_S16LE && bps == 8) | |
103 | id = CODEC_ID_PCM_U8; | |
104 | return id; | |
105 | } | |
106 | ||
de6d9b64 FB |
107 | typedef struct { |
108 | offset_t data; | |
109 | } WAVContext; | |
110 | ||
111 | static int wav_write_header(AVFormatContext *s) | |
112 | { | |
c9a65ca8 | 113 | WAVContext *wav = s->priv_data; |
de6d9b64 FB |
114 | ByteIOContext *pb = &s->pb; |
115 | offset_t fmt; | |
116 | ||
de6d9b64 FB |
117 | put_tag(pb, "RIFF"); |
118 | put_le32(pb, 0); /* file length */ | |
119 | put_tag(pb, "WAVE"); | |
120 | ||
121 | /* format header */ | |
122 | fmt = start_tag(pb, "fmt "); | |
46a3d068 | 123 | if (put_wav_header(pb, &s->streams[0]->codec) < 0) { |
1ea4f593 | 124 | av_free(wav); |
46a3d068 FB |
125 | return -1; |
126 | } | |
de6d9b64 FB |
127 | end_tag(pb, fmt); |
128 | ||
129 | /* data header */ | |
130 | wav->data = start_tag(pb, "data"); | |
131 | ||
132 | put_flush_packet(pb); | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | static int wav_write_packet(AVFormatContext *s, int stream_index_ptr, | |
10bb7023 | 138 | UINT8 *buf, int size, int force_pts) |
de6d9b64 FB |
139 | { |
140 | ByteIOContext *pb = &s->pb; | |
141 | put_buffer(pb, buf, size); | |
142 | return 0; | |
143 | } | |
144 | ||
145 | static int wav_write_trailer(AVFormatContext *s) | |
146 | { | |
147 | ByteIOContext *pb = &s->pb; | |
148 | WAVContext *wav = s->priv_data; | |
149 | offset_t file_size; | |
150 | ||
151 | if (!url_is_streamed(&s->pb)) { | |
152 | end_tag(pb, wav->data); | |
153 | ||
154 | /* update file size */ | |
155 | file_size = url_ftell(pb); | |
156 | url_fseek(pb, 4, SEEK_SET); | |
67e9bb0d | 157 | put_le32(pb, (UINT32)(file_size - 8)); |
de6d9b64 FB |
158 | url_fseek(pb, file_size, SEEK_SET); |
159 | ||
160 | put_flush_packet(pb); | |
161 | } | |
de6d9b64 FB |
162 | return 0; |
163 | } | |
164 | ||
165 | /* return the size of the found tag */ | |
166 | /* XXX: > 2GB ? */ | |
8be1c656 | 167 | static int find_tag(ByteIOContext *pb, UINT32 tag1) |
de6d9b64 FB |
168 | { |
169 | unsigned int tag; | |
170 | int size; | |
171 | ||
172 | for(;;) { | |
173 | if (url_feof(pb)) | |
174 | return -1; | |
175 | tag = get_le32(pb); | |
176 | size = get_le32(pb); | |
177 | if (tag == tag1) | |
178 | break; | |
179 | url_fseek(pb, size, SEEK_CUR); | |
180 | } | |
181 | if (size < 0) | |
182 | size = 0x7fffffff; | |
183 | return size; | |
184 | } | |
185 | ||
c9a65ca8 FB |
186 | static int wav_probe(AVProbeData *p) |
187 | { | |
188 | /* check file header */ | |
189 | if (p->buf_size <= 32) | |
190 | return 0; | |
191 | if (p->buf[0] == 'R' && p->buf[1] == 'I' && | |
192 | p->buf[2] == 'F' && p->buf[3] == 'F' && | |
193 | p->buf[8] == 'W' && p->buf[9] == 'A' && | |
194 | p->buf[10] == 'V' && p->buf[11] == 'E') | |
195 | return AVPROBE_SCORE_MAX; | |
196 | else | |
197 | return 0; | |
198 | } | |
199 | ||
de6d9b64 FB |
200 | /* wav input */ |
201 | static int wav_read_header(AVFormatContext *s, | |
202 | AVFormatParameters *ap) | |
203 | { | |
204 | int size; | |
205 | unsigned int tag; | |
206 | ByteIOContext *pb = &s->pb; | |
5ed8fafc | 207 | unsigned int id, channels, rate, bit_rate, extra_size, bps; |
de6d9b64 FB |
208 | AVStream *st; |
209 | ||
210 | /* check RIFF header */ | |
211 | tag = get_le32(pb); | |
212 | ||
213 | if (tag != MKTAG('R', 'I', 'F', 'F')) | |
214 | return -1; | |
215 | get_le32(pb); /* file size */ | |
216 | tag = get_le32(pb); | |
217 | if (tag != MKTAG('W', 'A', 'V', 'E')) | |
218 | return -1; | |
219 | ||
220 | /* parse fmt header */ | |
221 | size = find_tag(pb, MKTAG('f', 'm', 't', ' ')); | |
222 | if (size < 0) | |
223 | return -1; | |
224 | id = get_le16(pb); | |
225 | channels = get_le16(pb); | |
226 | rate = get_le32(pb); | |
227 | bit_rate = get_le32(pb) * 8; | |
228 | get_le16(pb); /* block align */ | |
5ed8fafc | 229 | bps = get_le16(pb); /* bits per sample */ |
de6d9b64 FB |
230 | if (size >= 18) { |
231 | /* wav_extra_size */ | |
232 | extra_size = get_le16(pb); | |
233 | /* skip unused data */ | |
234 | url_fseek(pb, size - 18, SEEK_CUR); | |
235 | } | |
236 | ||
237 | size = find_tag(pb, MKTAG('d', 'a', 't', 'a')); | |
238 | if (size < 0) | |
239 | return -1; | |
240 | ||
241 | /* now we are ready: build format streams */ | |
c9a65ca8 | 242 | st = av_new_stream(s, 0); |
de6d9b64 | 243 | if (!st) |
c9a65ca8 | 244 | return AVERROR_NOMEM; |
de6d9b64 | 245 | |
de6d9b64 FB |
246 | st->codec.codec_type = CODEC_TYPE_AUDIO; |
247 | st->codec.codec_tag = id; | |
46a3d068 | 248 | st->codec.codec_id = wav_codec_get_id(id, bps); |
de6d9b64 FB |
249 | st->codec.channels = channels; |
250 | st->codec.sample_rate = rate; | |
251 | return 0; | |
252 | } | |
253 | ||
254 | #define MAX_SIZE 4096 | |
255 | ||
256 | static int wav_read_packet(AVFormatContext *s, | |
257 | AVPacket *pkt) | |
258 | { | |
259 | int packet_size, n, ret; | |
260 | ||
261 | if (url_feof(&s->pb)) | |
262 | return -EIO; | |
263 | packet_size = url_get_packet_size(&s->pb); | |
264 | n = MAX_SIZE / packet_size; | |
265 | if (n <= 0) | |
266 | return n = 1; | |
267 | if (av_new_packet(pkt, n * packet_size)) | |
268 | return -EIO; | |
269 | pkt->stream_index = 0; | |
270 | ||
271 | ret = get_buffer(&s->pb, pkt->data, pkt->size); | |
272 | if (ret < 0) | |
273 | av_free_packet(pkt); | |
5ed8fafc FB |
274 | /* note: we need to modify the packet size here to handle the last |
275 | packet */ | |
276 | pkt->size = ret; | |
de6d9b64 FB |
277 | return ret; |
278 | } | |
279 | ||
280 | static int wav_read_close(AVFormatContext *s) | |
281 | { | |
282 | return 0; | |
283 | } | |
284 | ||
c9a65ca8 FB |
285 | static AVInputFormat wav_iformat = { |
286 | "wav", | |
287 | "wav format", | |
288 | 0, | |
289 | wav_probe, | |
290 | wav_read_header, | |
291 | wav_read_packet, | |
292 | wav_read_close, | |
293 | }; | |
294 | ||
295 | static AVOutputFormat wav_oformat = { | |
de6d9b64 FB |
296 | "wav", |
297 | "wav format", | |
298 | "audio/x-wav", | |
299 | "wav", | |
c9a65ca8 | 300 | sizeof(WAVContext), |
5ed8fafc | 301 | CODEC_ID_PCM_S16LE, |
de6d9b64 FB |
302 | CODEC_ID_NONE, |
303 | wav_write_header, | |
304 | wav_write_packet, | |
305 | wav_write_trailer, | |
de6d9b64 | 306 | }; |
c9a65ca8 FB |
307 | |
308 | int wav_init(void) | |
309 | { | |
310 | av_register_input_format(&wav_iformat); | |
311 | av_register_output_format(&wav_oformat); | |
312 | return 0; | |
313 | } |