- ME method compatibility with legacy apps.
[libav.git] / libav / wav.c
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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 */
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19#include "avformat.h"
20#include "avi.h"
21
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22CodecTag codec_wav_tags[] = {
23 { CODEC_ID_MP2, 0x55 },
5798368b 24 { CODEC_ID_MP3LAME, 0x55 },
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25 { CODEC_ID_MP2, 0x50 },
26 { CODEC_ID_AC3, 0x2000 },
27 { CODEC_ID_PCM_S16LE, 0x01 },
28 { CODEC_ID_PCM_U8, 0x01 }, /* must come after s16le in this list */
29 { CODEC_ID_PCM_ALAW, 0x06 },
30 { CODEC_ID_PCM_MULAW, 0x07 },
31 { 0, 0 },
32};
33
34/* WAVEFORMATEX header */
35int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
36{
86bec9a1 37 int tag, bps, blkalign, bytespersec;
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38
39 tag = codec_get_tag(codec_wav_tags, enc->codec_id);
40 if (tag == 0)
41 return -1;
42 put_le16(pb, tag);
43 put_le16(pb, enc->channels);
44 put_le32(pb, enc->sample_rate);
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45 if (enc->codec_id == CODEC_ID_PCM_U8 ||
46 enc->codec_id == CODEC_ID_PCM_ALAW ||
47 enc->codec_id == CODEC_ID_PCM_MULAW) {
48 bps = 8;
5798368b 49 } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3LAME) {
86bec9a1 50 bps = 0;
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51 } else {
52 bps = 16;
53 }
46a3d068 54
5798368b 55 if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3LAME)
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56 blkalign = 1;
57 else
58 blkalign = enc->channels*bps >> 3;
59 if (enc->codec_id == CODEC_ID_PCM_U8 ||
60 enc->codec_id == CODEC_ID_PCM_S16LE) {
61 bytespersec = enc->sample_rate * blkalign;
62 } else {
63 bytespersec = enc->bit_rate / 8;
64 }
65 put_le32(pb, bytespersec); /* bytes per second */
66 put_le16(pb, blkalign); /* block align */
67 put_le16(pb, bps); /* bits per sample */
5798368b 68 if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3LAME) {
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69 put_le16(pb, 12); /* wav_extra_size */
70 put_le16(pb, 1); /* wID */
71 put_le32(pb, 2); /* fdwFlags */
72 put_le16(pb, 1152); /* nBlockSize */
73 put_le16(pb, 1); /* nFramesPerBlock */
74 put_le16(pb, 1393); /* nCodecDelay */
75 } else
76 put_le16(pb, 0); /* wav_extra_size */
77
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78 return 0;
79}
80
81int wav_codec_get_id(unsigned int tag, int bps)
82{
83 int id;
84 id = codec_get_id(codec_wav_tags, tag);
85 if (id <= 0)
86 return id;
87 /* handle specific u8 codec */
88 if (id == CODEC_ID_PCM_S16LE && bps == 8)
89 id = CODEC_ID_PCM_U8;
90 return id;
91}
92
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93typedef struct {
94 offset_t data;
95} WAVContext;
96
97static int wav_write_header(AVFormatContext *s)
98{
99 WAVContext *wav;
100 ByteIOContext *pb = &s->pb;
101 offset_t fmt;
102
103 wav = malloc(sizeof(WAVContext));
104 if (!wav)
105 return -1;
106 memset(wav, 0, sizeof(WAVContext));
107 s->priv_data = wav;
108
109 put_tag(pb, "RIFF");
110 put_le32(pb, 0); /* file length */
111 put_tag(pb, "WAVE");
112
113 /* format header */
114 fmt = start_tag(pb, "fmt ");
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115 if (put_wav_header(pb, &s->streams[0]->codec) < 0) {
116 free(wav);
117 return -1;
118 }
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119 end_tag(pb, fmt);
120
121 /* data header */
122 wav->data = start_tag(pb, "data");
123
124 put_flush_packet(pb);
125
126 return 0;
127}
128
129static int wav_write_packet(AVFormatContext *s, int stream_index_ptr,
10bb7023 130 UINT8 *buf, int size, int force_pts)
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131{
132 ByteIOContext *pb = &s->pb;
133 put_buffer(pb, buf, size);
134 return 0;
135}
136
137static int wav_write_trailer(AVFormatContext *s)
138{
139 ByteIOContext *pb = &s->pb;
140 WAVContext *wav = s->priv_data;
141 offset_t file_size;
142
143 if (!url_is_streamed(&s->pb)) {
144 end_tag(pb, wav->data);
145
146 /* update file size */
147 file_size = url_ftell(pb);
148 url_fseek(pb, 4, SEEK_SET);
67e9bb0d 149 put_le32(pb, (UINT32)(file_size - 8));
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150 url_fseek(pb, file_size, SEEK_SET);
151
152 put_flush_packet(pb);
153 }
154
155 free(wav);
156 return 0;
157}
158
159/* return the size of the found tag */
160/* XXX: > 2GB ? */
8be1c656 161static int find_tag(ByteIOContext *pb, UINT32 tag1)
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162{
163 unsigned int tag;
164 int size;
165
166 for(;;) {
167 if (url_feof(pb))
168 return -1;
169 tag = get_le32(pb);
170 size = get_le32(pb);
171 if (tag == tag1)
172 break;
173 url_fseek(pb, size, SEEK_CUR);
174 }
175 if (size < 0)
176 size = 0x7fffffff;
177 return size;
178}
179
180/* wav input */
181static int wav_read_header(AVFormatContext *s,
182 AVFormatParameters *ap)
183{
184 int size;
185 unsigned int tag;
186 ByteIOContext *pb = &s->pb;
5ed8fafc 187 unsigned int id, channels, rate, bit_rate, extra_size, bps;
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188 AVStream *st;
189
190 /* check RIFF header */
191 tag = get_le32(pb);
192
193 if (tag != MKTAG('R', 'I', 'F', 'F'))
194 return -1;
195 get_le32(pb); /* file size */
196 tag = get_le32(pb);
197 if (tag != MKTAG('W', 'A', 'V', 'E'))
198 return -1;
199
200 /* parse fmt header */
201 size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
202 if (size < 0)
203 return -1;
204 id = get_le16(pb);
205 channels = get_le16(pb);
206 rate = get_le32(pb);
207 bit_rate = get_le32(pb) * 8;
208 get_le16(pb); /* block align */
5ed8fafc 209 bps = get_le16(pb); /* bits per sample */
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210 if (size >= 18) {
211 /* wav_extra_size */
212 extra_size = get_le16(pb);
213 /* skip unused data */
214 url_fseek(pb, size - 18, SEEK_CUR);
215 }
216
217 size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
218 if (size < 0)
219 return -1;
220
221 /* now we are ready: build format streams */
222 st = malloc(sizeof(AVStream));
223 if (!st)
224 return -1;
225 s->nb_streams = 1;
226 s->streams[0] = st;
227
228 st->id = 0;
229
230 st->codec.codec_type = CODEC_TYPE_AUDIO;
231 st->codec.codec_tag = id;
46a3d068 232 st->codec.codec_id = wav_codec_get_id(id, bps);
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233 st->codec.channels = channels;
234 st->codec.sample_rate = rate;
235 return 0;
236}
237
238#define MAX_SIZE 4096
239
240static int wav_read_packet(AVFormatContext *s,
241 AVPacket *pkt)
242{
243 int packet_size, n, ret;
244
245 if (url_feof(&s->pb))
246 return -EIO;
247 packet_size = url_get_packet_size(&s->pb);
248 n = MAX_SIZE / packet_size;
249 if (n <= 0)
250 return n = 1;
251 if (av_new_packet(pkt, n * packet_size))
252 return -EIO;
253 pkt->stream_index = 0;
254
255 ret = get_buffer(&s->pb, pkt->data, pkt->size);
256 if (ret < 0)
257 av_free_packet(pkt);
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258 /* note: we need to modify the packet size here to handle the last
259 packet */
260 pkt->size = ret;
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261 return ret;
262}
263
264static int wav_read_close(AVFormatContext *s)
265{
266 return 0;
267}
268
269AVFormat wav_format = {
270 "wav",
271 "wav format",
272 "audio/x-wav",
273 "wav",
5ed8fafc 274 CODEC_ID_PCM_S16LE,
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275 CODEC_ID_NONE,
276 wav_write_header,
277 wav_write_packet,
278 wav_write_trailer,
279
280 wav_read_header,
281 wav_read_packet,
282 wav_read_close,
283};