2 * WAV encoder and decoder
3 * Copyright (c) 2001, 2002 Fabrice Bellard.
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.
10 * This library 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 GNU
13 * Lesser General Public License for more details.
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
22 const CodecTag codec_wav_tags[] = {
23 { CODEC_ID_MP2, 0x50 },
24 { CODEC_ID_MP3, 0x55 },
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 { CODEC_ID_ADPCM_MS, 0x02 },
31 { CODEC_ID_ADPCM_IMA_WAV, 0x11 },
32 { CODEC_ID_ADPCM_G726, 0x45 },
33 { CODEC_ID_ADPCM_IMA_DK4, 0x61 }, /* rogue format number */
34 { CODEC_ID_ADPCM_IMA_DK3, 0x62 }, /* rogue format number */
35 { CODEC_ID_WMAV1, 0x160 },
36 { CODEC_ID_WMAV2, 0x161 },
37 { CODEC_ID_AAC, 0x706d },
38 { CODEC_ID_VORBIS, ('V'<<8)+'o' }, //HACK/FIXME, does vorbis in WAV/AVI have an (in)official id?
39 { CODEC_ID_SONIC, 0x2048 },
40 { CODEC_ID_SONIC_LS, 0x2048 },
41 { CODEC_ID_ADPCM_CT, 0x200 },
42 { CODEC_ID_ADPCM_SWF, ('S'<<8)+'F' },
46 #ifdef CONFIG_ENCODERS
47 /* WAVEFORMATEX header */
48 /* returns the size or -1 on error */
49 int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
51 int bps, blkalign, bytespersec;
55 enc->codec_tag = codec_get_tag(codec_wav_tags, enc->codec_id);
59 put_le16(pb, enc->codec_tag);
60 put_le16(pb, enc->channels);
61 put_le32(pb, enc->sample_rate);
62 if (enc->codec_id == CODEC_ID_PCM_U8 ||
63 enc->codec_id == CODEC_ID_PCM_ALAW ||
64 enc->codec_id == CODEC_ID_PCM_MULAW) {
66 } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
68 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV || enc->codec_id == CODEC_ID_ADPCM_MS) {
74 if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
75 blkalign = enc->frame_size; //this is wrong, but seems many demuxers dont work if this is set correctly
76 //blkalign = 144 * enc->bit_rate/enc->sample_rate;
77 } else if (enc->block_align != 0) { /* specified by the codec */
78 blkalign = enc->block_align;
80 blkalign = enc->channels*bps >> 3;
81 if (enc->codec_id == CODEC_ID_PCM_U8 ||
82 enc->codec_id == CODEC_ID_PCM_S16LE) {
83 bytespersec = enc->sample_rate * blkalign;
85 bytespersec = enc->bit_rate / 8;
87 put_le32(pb, bytespersec); /* bytes per second */
88 put_le16(pb, blkalign); /* block align */
89 put_le16(pb, bps); /* bits per sample */
90 if (enc->codec_id == CODEC_ID_MP3) {
91 put_le16(pb, 12); /* wav_extra_size */
93 put_le16(pb, 1); /* wID */
94 put_le32(pb, 2); /* fdwFlags */
95 put_le16(pb, 1152); /* nBlockSize */
96 put_le16(pb, 1); /* nFramesPerBlock */
97 put_le16(pb, 1393); /* nCodecDelay */
98 } else if (enc->codec_id == CODEC_ID_MP2) {
99 put_le16(pb, 22); /* wav_extra_size */
101 put_le16(pb, 2); /* fwHeadLayer */
102 put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
103 put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
104 put_le16(pb, 0); /* fwHeadModeExt */
105 put_le16(pb, 1); /* wHeadEmphasis */
106 put_le16(pb, 16); /* fwHeadFlags */
107 put_le32(pb, 0); /* dwPTSLow */
108 put_le32(pb, 0); /* dwPTSHigh */
109 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
110 put_le16(pb, 2); /* wav_extra_size */
112 put_le16(pb, ((enc->block_align - 4 * enc->channels) / (4 * enc->channels)) * 8 + 1); /* wSamplesPerBlock */
113 } else if(enc->extradata_size){
114 put_le16(pb, enc->extradata_size);
115 put_buffer(pb, enc->extradata, enc->extradata_size);
116 hdrsize += enc->extradata_size;
127 #endif //CONFIG_ENCODERS
129 /* We could be given one of the three possible structures here:
130 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
131 * is an expansion of the previous one with the fields added
132 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
133 * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
134 * an openended structure.
136 void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
141 codec->codec_type = CODEC_TYPE_AUDIO;
142 codec->codec_tag = id;
143 codec->channels = get_le16(pb);
144 codec->sample_rate = get_le32(pb);
145 codec->bit_rate = get_le32(pb) * 8;
146 codec->block_align = get_le16(pb);
147 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
148 codec->bits_per_sample = 8;
150 codec->bits_per_sample = get_le16(pb);
151 codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
153 if (size > 16) { /* We're obviously dealing with WAVEFORMATEX */
154 codec->extradata_size = get_le16(pb);
155 if (codec->extradata_size > 0) {
156 if (codec->extradata_size > size - 18)
157 codec->extradata_size = size - 18;
158 codec->extradata = av_mallocz(codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
159 get_buffer(pb, codec->extradata, codec->extradata_size);
161 codec->extradata_size = 0;
163 /* It is possible for the chunk to contain garbage at the end */
164 if (size - codec->extradata_size - 18 > 0)
165 url_fskip(pb, size - codec->extradata_size - 18);
170 int wav_codec_get_id(unsigned int tag, int bps)
173 id = codec_get_id(codec_wav_tags, tag);
176 /* handle specific u8 codec */
177 if (id == CODEC_ID_PCM_S16LE && bps == 8)
178 id = CODEC_ID_PCM_U8;
182 #ifdef CONFIG_ENCODERS
187 static int wav_write_header(AVFormatContext *s)
189 WAVContext *wav = s->priv_data;
190 ByteIOContext *pb = &s->pb;
194 put_le32(pb, 0); /* file length */
198 fmt = start_tag(pb, "fmt ");
199 if (put_wav_header(pb, &s->streams[0]->codec) < 0) {
205 av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec.sample_rate);
208 wav->data = start_tag(pb, "data");
210 put_flush_packet(pb);
215 static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
217 ByteIOContext *pb = &s->pb;
218 put_buffer(pb, pkt->data, pkt->size);
222 static int wav_write_trailer(AVFormatContext *s)
224 ByteIOContext *pb = &s->pb;
225 WAVContext *wav = s->priv_data;
228 if (!url_is_streamed(&s->pb)) {
229 end_tag(pb, wav->data);
231 /* update file size */
232 file_size = url_ftell(pb);
233 url_fseek(pb, 4, SEEK_SET);
234 put_le32(pb, (uint32_t)(file_size - 8));
235 url_fseek(pb, file_size, SEEK_SET);
237 put_flush_packet(pb);
241 #endif //CONFIG_ENCODERS
243 /* return the size of the found tag */
245 static int find_tag(ByteIOContext *pb, uint32_t tag1)
257 url_fseek(pb, size, SEEK_CUR);
264 static int wav_probe(AVProbeData *p)
266 /* check file header */
267 if (p->buf_size <= 32)
269 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
270 p->buf[2] == 'F' && p->buf[3] == 'F' &&
271 p->buf[8] == 'W' && p->buf[9] == 'A' &&
272 p->buf[10] == 'V' && p->buf[11] == 'E')
273 return AVPROBE_SCORE_MAX;
279 static int wav_read_header(AVFormatContext *s,
280 AVFormatParameters *ap)
284 ByteIOContext *pb = &s->pb;
287 /* check RIFF header */
290 if (tag != MKTAG('R', 'I', 'F', 'F'))
292 get_le32(pb); /* file size */
294 if (tag != MKTAG('W', 'A', 'V', 'E'))
297 /* parse fmt header */
298 size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
301 st = av_new_stream(s, 0);
303 return AVERROR_NOMEM;
305 get_wav_header(pb, &st->codec, size);
306 st->need_parsing = 1;
308 av_set_pts_info(st, 64, 1, st->codec.sample_rate);
310 size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
316 #define MAX_SIZE 4096
318 static int wav_read_packet(AVFormatContext *s,
324 if (url_feof(&s->pb))
329 if (st->codec.block_align > 1) {
330 if (size < st->codec.block_align)
331 size = st->codec.block_align;
332 size = (size / st->codec.block_align) * st->codec.block_align;
334 if (av_new_packet(pkt, size))
336 pkt->stream_index = 0;
338 ret = get_buffer(&s->pb, pkt->data, pkt->size);
341 /* note: we need to modify the packet size here to handle the last
347 static int wav_read_close(AVFormatContext *s)
352 static int wav_read_seek(AVFormatContext *s,
353 int stream_index, int64_t timestamp, int flags)
358 switch(st->codec.codec_id) {
363 /* use generic seeking with dynamically generated indexes */
368 return pcm_read_seek(s, stream_index, timestamp, flags);
372 static AVInputFormat wav_iformat = {
383 #ifdef CONFIG_ENCODERS
384 static AVOutputFormat wav_oformat = {
396 #endif //CONFIG_ENCODERS
398 int ff_wav_init(void)
400 av_register_input_format(&wav_iformat);
401 #ifdef CONFIG_ENCODERS
402 av_register_output_format(&wav_oformat);
403 #endif //CONFIG_ENCODERS