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_VORBIS, ('V'<<8)+'o' }, //HACK/FIXME, does vorbis in WAV/AVI have an (in)official id?
41 #ifdef CONFIG_ENCODERS
42 /* WAVEFORMATEX header */
43 /* returns the size or -1 on error */
44 int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
46 int bps, blkalign, bytespersec;
50 enc->codec_tag = codec_get_tag(codec_wav_tags, enc->codec_id);
54 put_le16(pb, enc->codec_tag);
55 put_le16(pb, enc->channels);
56 put_le32(pb, enc->sample_rate);
57 if (enc->codec_id == CODEC_ID_PCM_U8 ||
58 enc->codec_id == CODEC_ID_PCM_ALAW ||
59 enc->codec_id == CODEC_ID_PCM_MULAW) {
61 } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
63 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV || enc->codec_id == CODEC_ID_ADPCM_MS) {
69 if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
71 //blkalign = 144 * enc->bit_rate/enc->sample_rate;
72 } else if (enc->block_align != 0) { /* specified by the codec */
73 blkalign = enc->block_align;
75 blkalign = enc->channels*bps >> 3;
76 if (enc->codec_id == CODEC_ID_PCM_U8 ||
77 enc->codec_id == CODEC_ID_PCM_S16LE) {
78 bytespersec = enc->sample_rate * blkalign;
80 bytespersec = enc->bit_rate / 8;
82 put_le32(pb, bytespersec); /* bytes per second */
83 put_le16(pb, blkalign); /* block align */
84 put_le16(pb, bps); /* bits per sample */
85 if (enc->codec_id == CODEC_ID_MP3) {
86 put_le16(pb, 12); /* wav_extra_size */
88 put_le16(pb, 1); /* wID */
89 put_le32(pb, 2); /* fdwFlags */
90 put_le16(pb, 1152); /* nBlockSize */
91 put_le16(pb, 1); /* nFramesPerBlock */
92 put_le16(pb, 1393); /* nCodecDelay */
93 } else if (enc->codec_id == CODEC_ID_MP2) {
94 put_le16(pb, 22); /* wav_extra_size */
96 put_le16(pb, 2); /* fwHeadLayer */
97 put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
98 put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
99 put_le16(pb, 0); /* fwHeadModeExt */
100 put_le16(pb, 1); /* wHeadEmphasis */
101 put_le16(pb, 16); /* fwHeadFlags */
102 put_le32(pb, 0); /* dwPTSLow */
103 put_le32(pb, 0); /* dwPTSHigh */
104 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
105 put_le16(pb, 2); /* wav_extra_size */
107 put_le16(pb, ((enc->block_align - 4 * enc->channels) / (4 * enc->channels)) * 8 + 1); /* wSamplesPerBlock */
109 put_le16(pb, enc->extradata_size);
110 put_buffer(pb, enc->extradata, enc->extradata_size);
111 hdrsize += enc->extradata_size;
120 #endif //CONFIG_ENCODERS
122 /* We could be given one of the three possible structures here:
123 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
124 * is an expansion of the previous one with the fields added
125 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
126 * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
127 * an openended structure.
129 void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
134 codec->codec_type = CODEC_TYPE_AUDIO;
135 codec->codec_tag = id;
136 codec->channels = get_le16(pb);
137 codec->sample_rate = get_le32(pb);
138 codec->bit_rate = get_le32(pb) * 8;
139 codec->block_align = get_le16(pb);
140 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
141 codec->bits_per_sample = 8;
143 codec->bits_per_sample = get_le16(pb);
144 codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
146 if (size > 16) { /* We're obviously dealing with WAVEFORMATEX */
147 codec->extradata_size = get_le16(pb);
148 if (codec->extradata_size > 0) {
149 if (codec->extradata_size > size - 18)
150 codec->extradata_size = size - 18;
151 codec->extradata = av_mallocz(codec->extradata_size);
152 get_buffer(pb, codec->extradata, codec->extradata_size);
154 codec->extradata_size = 0;
156 /* It is possible for the chunk to contain garbage at the end */
157 if (size - codec->extradata_size - 18 > 0)
158 url_fskip(pb, size - codec->extradata_size - 18);
163 int wav_codec_get_id(unsigned int tag, int bps)
166 id = codec_get_id(codec_wav_tags, tag);
169 /* handle specific u8 codec */
170 if (id == CODEC_ID_PCM_S16LE && bps == 8)
171 id = CODEC_ID_PCM_U8;
175 #ifdef CONFIG_ENCODERS
180 static int wav_write_header(AVFormatContext *s)
182 WAVContext *wav = s->priv_data;
183 ByteIOContext *pb = &s->pb;
187 put_le32(pb, 0); /* file length */
191 fmt = start_tag(pb, "fmt ");
192 if (put_wav_header(pb, &s->streams[0]->codec) < 0) {
199 wav->data = start_tag(pb, "data");
201 put_flush_packet(pb);
206 static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
208 ByteIOContext *pb = &s->pb;
209 put_buffer(pb, pkt->data, pkt->size);
213 static int wav_write_trailer(AVFormatContext *s)
215 ByteIOContext *pb = &s->pb;
216 WAVContext *wav = s->priv_data;
219 if (!url_is_streamed(&s->pb)) {
220 end_tag(pb, wav->data);
222 /* update file size */
223 file_size = url_ftell(pb);
224 url_fseek(pb, 4, SEEK_SET);
225 put_le32(pb, (uint32_t)(file_size - 8));
226 url_fseek(pb, file_size, SEEK_SET);
228 put_flush_packet(pb);
232 #endif //CONFIG_ENCODERS
234 /* return the size of the found tag */
236 static int find_tag(ByteIOContext *pb, uint32_t tag1)
248 url_fseek(pb, size, SEEK_CUR);
255 static int wav_probe(AVProbeData *p)
257 /* check file header */
258 if (p->buf_size <= 32)
260 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
261 p->buf[2] == 'F' && p->buf[3] == 'F' &&
262 p->buf[8] == 'W' && p->buf[9] == 'A' &&
263 p->buf[10] == 'V' && p->buf[11] == 'E')
264 return AVPROBE_SCORE_MAX;
270 static int wav_read_header(AVFormatContext *s,
271 AVFormatParameters *ap)
275 ByteIOContext *pb = &s->pb;
278 /* check RIFF header */
281 if (tag != MKTAG('R', 'I', 'F', 'F'))
283 get_le32(pb); /* file size */
285 if (tag != MKTAG('W', 'A', 'V', 'E'))
288 /* parse fmt header */
289 size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
292 st = av_new_stream(s, 0);
294 return AVERROR_NOMEM;
296 get_wav_header(pb, &st->codec, size);
297 st->need_parsing = 1;
299 size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
305 #define MAX_SIZE 4096
307 static int wav_read_packet(AVFormatContext *s,
313 if (url_feof(&s->pb))
318 if (st->codec.block_align > 1) {
319 if (size < st->codec.block_align)
320 size = st->codec.block_align;
321 size = (size / st->codec.block_align) * st->codec.block_align;
323 if (av_new_packet(pkt, size))
325 pkt->stream_index = 0;
327 ret = get_buffer(&s->pb, pkt->data, pkt->size);
330 /* note: we need to modify the packet size here to handle the last
336 static int wav_read_close(AVFormatContext *s)
341 static int wav_read_seek(AVFormatContext *s,
342 int stream_index, int64_t timestamp)
347 switch(st->codec.codec_id) {
352 /* use generic seeking with dynamically generated indexes */
357 return pcm_read_seek(s, stream_index, timestamp);
361 static AVInputFormat wav_iformat = {
372 #ifdef CONFIG_ENCODERS
373 static AVOutputFormat wav_oformat = {
385 #endif //CONFIG_ENCODERS
387 int ff_wav_init(void)
389 av_register_input_format(&wav_iformat);
390 #ifdef CONFIG_ENCODERS
391 av_register_output_format(&wav_oformat);
392 #endif //CONFIG_ENCODERS