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_YAMAHA, 0x20 },
33 { CODEC_ID_ADPCM_G726, 0x45 },
34 { CODEC_ID_ADPCM_IMA_DK4, 0x61 }, /* rogue format number */
35 { CODEC_ID_ADPCM_IMA_DK3, 0x62 }, /* rogue format number */
36 { CODEC_ID_WMAV1, 0x160 },
37 { CODEC_ID_WMAV2, 0x161 },
38 { CODEC_ID_AAC, 0x706d },
39 { CODEC_ID_VORBIS, ('V'<<8)+'o' }, //HACK/FIXME, does vorbis in WAV/AVI have an (in)official id?
40 { CODEC_ID_SONIC, 0x2048 },
41 { CODEC_ID_SONIC_LS, 0x2048 },
42 { CODEC_ID_ADPCM_CT, 0x200 },
43 { CODEC_ID_ADPCM_SWF, ('S'<<8)+'F' },
47 #ifdef CONFIG_ENCODERS
48 /* WAVEFORMATEX header */
49 /* returns the size or -1 on error */
50 int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
52 int bps, blkalign, bytespersec;
56 enc->codec_tag = codec_get_tag(codec_wav_tags, enc->codec_id);
60 put_le16(pb, enc->codec_tag);
61 put_le16(pb, enc->channels);
62 put_le32(pb, enc->sample_rate);
63 if (enc->codec_id == CODEC_ID_PCM_U8 ||
64 enc->codec_id == CODEC_ID_PCM_ALAW ||
65 enc->codec_id == CODEC_ID_PCM_MULAW) {
67 } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
69 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV || enc->codec_id == CODEC_ID_ADPCM_MS || enc->codec_id == CODEC_ID_ADPCM_G726 || enc->codec_id == CODEC_ID_ADPCM_YAMAHA) { //
75 if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
76 blkalign = enc->frame_size; //this is wrong, but seems many demuxers dont work if this is set correctly
77 //blkalign = 144 * enc->bit_rate/enc->sample_rate;
78 } else if (enc->codec_id == CODEC_ID_ADPCM_G726) { //
80 } else if (enc->block_align != 0) { /* specified by the codec */
81 blkalign = enc->block_align;
83 blkalign = enc->channels*bps >> 3;
84 if (enc->codec_id == CODEC_ID_PCM_U8 ||
85 enc->codec_id == CODEC_ID_PCM_S16LE) {
86 bytespersec = enc->sample_rate * blkalign;
88 bytespersec = enc->bit_rate / 8;
90 put_le32(pb, bytespersec); /* bytes per second */
91 put_le16(pb, blkalign); /* block align */
92 put_le16(pb, bps); /* bits per sample */
93 if (enc->codec_id == CODEC_ID_MP3) {
94 put_le16(pb, 12); /* wav_extra_size */
96 put_le16(pb, 1); /* wID */
97 put_le32(pb, 2); /* fdwFlags */
98 put_le16(pb, 1152); /* nBlockSize */
99 put_le16(pb, 1); /* nFramesPerBlock */
100 put_le16(pb, 1393); /* nCodecDelay */
101 } else if (enc->codec_id == CODEC_ID_MP2) {
102 put_le16(pb, 22); /* wav_extra_size */
104 put_le16(pb, 2); /* fwHeadLayer */
105 put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
106 put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
107 put_le16(pb, 0); /* fwHeadModeExt */
108 put_le16(pb, 1); /* wHeadEmphasis */
109 put_le16(pb, 16); /* fwHeadFlags */
110 put_le32(pb, 0); /* dwPTSLow */
111 put_le32(pb, 0); /* dwPTSHigh */
112 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
113 put_le16(pb, 2); /* wav_extra_size */
115 put_le16(pb, ((enc->block_align - 4 * enc->channels) / (4 * enc->channels)) * 8 + 1); /* wSamplesPerBlock */
116 } else if(enc->extradata_size){
117 put_le16(pb, enc->extradata_size);
118 put_buffer(pb, enc->extradata, enc->extradata_size);
119 hdrsize += enc->extradata_size;
130 #endif //CONFIG_ENCODERS
132 /* We could be given one of the three possible structures here:
133 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
134 * is an expansion of the previous one with the fields added
135 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
136 * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
137 * an openended structure.
139 void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
144 codec->codec_type = CODEC_TYPE_AUDIO;
145 codec->codec_tag = id;
146 codec->channels = get_le16(pb);
147 codec->sample_rate = get_le32(pb);
148 codec->bit_rate = get_le32(pb) * 8;
149 codec->block_align = get_le16(pb);
150 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
151 codec->bits_per_sample = 8;
153 codec->bits_per_sample = get_le16(pb);
154 codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
156 if (size > 16) { /* We're obviously dealing with WAVEFORMATEX */
157 codec->extradata_size = get_le16(pb);
158 if (codec->extradata_size > 0) {
159 if (codec->extradata_size > size - 18)
160 codec->extradata_size = size - 18;
161 codec->extradata = av_mallocz(codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
162 get_buffer(pb, codec->extradata, codec->extradata_size);
164 codec->extradata_size = 0;
166 /* It is possible for the chunk to contain garbage at the end */
167 if (size - codec->extradata_size - 18 > 0)
168 url_fskip(pb, size - codec->extradata_size - 18);
173 int wav_codec_get_id(unsigned int tag, int bps)
176 id = codec_get_id(codec_wav_tags, tag);
179 /* handle specific u8 codec */
180 if (id == CODEC_ID_PCM_S16LE && bps == 8)
181 id = CODEC_ID_PCM_U8;
185 #ifdef CONFIG_ENCODERS
190 static int wav_write_header(AVFormatContext *s)
192 WAVContext *wav = s->priv_data;
193 ByteIOContext *pb = &s->pb;
197 put_le32(pb, 0); /* file length */
201 fmt = start_tag(pb, "fmt ");
202 if (put_wav_header(pb, s->streams[0]->codec) < 0) {
208 av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
211 wav->data = start_tag(pb, "data");
213 put_flush_packet(pb);
218 static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
220 ByteIOContext *pb = &s->pb;
221 put_buffer(pb, pkt->data, pkt->size);
225 static int wav_write_trailer(AVFormatContext *s)
227 ByteIOContext *pb = &s->pb;
228 WAVContext *wav = s->priv_data;
231 if (!url_is_streamed(&s->pb)) {
232 end_tag(pb, wav->data);
234 /* update file size */
235 file_size = url_ftell(pb);
236 url_fseek(pb, 4, SEEK_SET);
237 put_le32(pb, (uint32_t)(file_size - 8));
238 url_fseek(pb, file_size, SEEK_SET);
240 put_flush_packet(pb);
244 #endif //CONFIG_ENCODERS
246 /* return the size of the found tag */
248 static int find_tag(ByteIOContext *pb, uint32_t tag1)
260 url_fseek(pb, size, SEEK_CUR);
267 static int wav_probe(AVProbeData *p)
269 /* check file header */
270 if (p->buf_size <= 32)
272 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
273 p->buf[2] == 'F' && p->buf[3] == 'F' &&
274 p->buf[8] == 'W' && p->buf[9] == 'A' &&
275 p->buf[10] == 'V' && p->buf[11] == 'E')
276 return AVPROBE_SCORE_MAX;
282 static int wav_read_header(AVFormatContext *s,
283 AVFormatParameters *ap)
287 ByteIOContext *pb = &s->pb;
290 /* check RIFF header */
293 if (tag != MKTAG('R', 'I', 'F', 'F'))
295 get_le32(pb); /* file size */
297 if (tag != MKTAG('W', 'A', 'V', 'E'))
300 /* parse fmt header */
301 size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
304 st = av_new_stream(s, 0);
306 return AVERROR_NOMEM;
308 get_wav_header(pb, st->codec, size);
309 st->need_parsing = 1;
311 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
313 size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
319 #define MAX_SIZE 4096
321 static int wav_read_packet(AVFormatContext *s,
327 if (url_feof(&s->pb))
332 if (st->codec->block_align > 1) {
333 if (size < st->codec->block_align)
334 size = st->codec->block_align;
335 size = (size / st->codec->block_align) * st->codec->block_align;
337 if (av_new_packet(pkt, size))
339 pkt->stream_index = 0;
341 ret = get_buffer(&s->pb, pkt->data, pkt->size);
344 /* note: we need to modify the packet size here to handle the last
350 static int wav_read_close(AVFormatContext *s)
355 static int wav_read_seek(AVFormatContext *s,
356 int stream_index, int64_t timestamp, int flags)
361 switch(st->codec->codec_id) {
366 /* use generic seeking with dynamically generated indexes */
371 return pcm_read_seek(s, stream_index, timestamp, flags);
375 static AVInputFormat wav_iformat = {
386 #ifdef CONFIG_ENCODERS
387 static AVOutputFormat wav_oformat = {
399 #endif //CONFIG_ENCODERS
401 int ff_wav_init(void)
403 av_register_input_format(&wav_iformat);
404 #ifdef CONFIG_ENCODERS
405 av_register_output_format(&wav_oformat);
406 #endif //CONFIG_ENCODERS