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_IMA_DK4, 0x61 }, /* rogue format number */
33 { CODEC_ID_ADPCM_IMA_DK3, 0x62 }, /* rogue format number */
34 { CODEC_ID_WMAV1, 0x160 },
35 { CODEC_ID_WMAV2, 0x161 },
39 /* WAVEFORMATEX header */
40 /* returns the size or -1 on error */
41 int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
43 int bps, blkalign, bytespersec;
47 enc->codec_tag = codec_get_tag(codec_wav_tags, enc->codec_id);
51 put_le16(pb, enc->codec_tag);
52 put_le16(pb, enc->channels);
53 put_le32(pb, enc->sample_rate);
54 if (enc->codec_id == CODEC_ID_PCM_U8 ||
55 enc->codec_id == CODEC_ID_PCM_ALAW ||
56 enc->codec_id == CODEC_ID_PCM_MULAW) {
58 } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
60 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV || enc->codec_id == CODEC_ID_ADPCM_MS) {
66 if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3) {
68 //blkalign = 144 * enc->bit_rate/enc->sample_rate;
69 } else if (enc->block_align != 0) { /* specified by the codec */
70 blkalign = enc->block_align;
72 blkalign = enc->channels*bps >> 3;
73 if (enc->codec_id == CODEC_ID_PCM_U8 ||
74 enc->codec_id == CODEC_ID_PCM_S16LE) {
75 bytespersec = enc->sample_rate * blkalign;
77 bytespersec = enc->bit_rate / 8;
79 put_le32(pb, bytespersec); /* bytes per second */
80 put_le16(pb, blkalign); /* block align */
81 put_le16(pb, bps); /* bits per sample */
82 if (enc->codec_id == CODEC_ID_MP3) {
83 put_le16(pb, 12); /* wav_extra_size */
85 put_le16(pb, 1); /* wID */
86 put_le32(pb, 2); /* fdwFlags */
87 put_le16(pb, 1152); /* nBlockSize */
88 put_le16(pb, 1); /* nFramesPerBlock */
89 put_le16(pb, 1393); /* nCodecDelay */
90 } else if (enc->codec_id == CODEC_ID_MP2) {
91 put_le16(pb, 22); /* wav_extra_size */
93 put_le16(pb, 2); /* fwHeadLayer */
94 put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
95 put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
96 put_le16(pb, 0); /* fwHeadModeExt */
97 put_le16(pb, 1); /* wHeadEmphasis */
98 put_le16(pb, 16); /* fwHeadFlags */
99 put_le32(pb, 0); /* dwPTSLow */
100 put_le32(pb, 0); /* dwPTSHigh */
101 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
102 put_le16(pb, 2); /* wav_extra_size */
103 put_le16(pb, ((enc->block_align - 4 * enc->channels) / (4 * enc->channels)) * 8 + 1); /* wSamplesPerBlock */
105 put_le16(pb, 0); /* wav_extra_size */
110 /* We could be given one of the three possible structures here:
111 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
112 * is an expansion of the previous one with the fields added
113 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
114 * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
115 * an openended structure.
117 void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size)
122 codec->codec_type = CODEC_TYPE_AUDIO;
123 codec->codec_tag = id;
124 codec->channels = get_le16(pb);
125 codec->sample_rate = get_le32(pb);
126 codec->bit_rate = get_le32(pb) * 8;
127 codec->block_align = get_le16(pb);
128 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
129 codec->bits_per_sample = 8;
131 codec->bits_per_sample = get_le16(pb);
132 codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample);
134 if (size > 16) { /* We're obviously dealing with WAVEFORMATEX */
135 codec->extradata_size = get_le16(pb);
136 if (codec->extradata_size > 0) {
137 if (codec->extradata_size > size - 18)
138 codec->extradata_size = size - 18;
139 codec->extradata = av_mallocz(codec->extradata_size);
140 get_buffer(pb, codec->extradata, codec->extradata_size);
142 codec->extradata_size = 0;
144 /* It is possible for the chunk to contain garbage at the end */
145 if (size - codec->extradata_size - 18 > 0)
146 url_fskip(pb, size - codec->extradata_size - 18);
151 int wav_codec_get_id(unsigned int tag, int bps)
154 id = codec_get_id(codec_wav_tags, tag);
157 /* handle specific u8 codec */
158 if (id == CODEC_ID_PCM_S16LE && bps == 8)
159 id = CODEC_ID_PCM_U8;
167 static int wav_write_header(AVFormatContext *s)
169 WAVContext *wav = s->priv_data;
170 ByteIOContext *pb = &s->pb;
174 put_le32(pb, 0); /* file length */
178 fmt = start_tag(pb, "fmt ");
179 if (put_wav_header(pb, &s->streams[0]->codec) < 0) {
186 wav->data = start_tag(pb, "data");
188 put_flush_packet(pb);
193 static int wav_write_packet(AVFormatContext *s, int stream_index_ptr,
194 const uint8_t *buf, int size, int64_t pts)
196 ByteIOContext *pb = &s->pb;
197 put_buffer(pb, buf, size);
201 static int wav_write_trailer(AVFormatContext *s)
203 ByteIOContext *pb = &s->pb;
204 WAVContext *wav = s->priv_data;
207 if (!url_is_streamed(&s->pb)) {
208 end_tag(pb, wav->data);
210 /* update file size */
211 file_size = url_ftell(pb);
212 url_fseek(pb, 4, SEEK_SET);
213 put_le32(pb, (uint32_t)(file_size - 8));
214 url_fseek(pb, file_size, SEEK_SET);
216 put_flush_packet(pb);
221 /* return the size of the found tag */
223 static int find_tag(ByteIOContext *pb, uint32_t tag1)
235 url_fseek(pb, size, SEEK_CUR);
242 static int wav_probe(AVProbeData *p)
244 /* check file header */
245 if (p->buf_size <= 32)
247 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
248 p->buf[2] == 'F' && p->buf[3] == 'F' &&
249 p->buf[8] == 'W' && p->buf[9] == 'A' &&
250 p->buf[10] == 'V' && p->buf[11] == 'E')
251 return AVPROBE_SCORE_MAX;
257 static int wav_read_header(AVFormatContext *s,
258 AVFormatParameters *ap)
262 ByteIOContext *pb = &s->pb;
265 /* check RIFF header */
268 if (tag != MKTAG('R', 'I', 'F', 'F'))
270 get_le32(pb); /* file size */
272 if (tag != MKTAG('W', 'A', 'V', 'E'))
275 /* parse fmt header */
276 size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
279 st = av_new_stream(s, 0);
281 return AVERROR_NOMEM;
283 get_wav_header(pb, &st->codec, size);
285 size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
291 #define MAX_SIZE 4096
293 static int wav_read_packet(AVFormatContext *s,
298 if (url_feof(&s->pb))
300 if (av_new_packet(pkt, MAX_SIZE))
302 pkt->stream_index = 0;
304 ret = get_buffer(&s->pb, pkt->data, pkt->size);
307 /* note: we need to modify the packet size here to handle the last
313 static int wav_read_close(AVFormatContext *s)
318 static AVInputFormat wav_iformat = {
328 static AVOutputFormat wav_oformat = {
343 av_register_input_format(&wav_iformat);
344 av_register_output_format(&wav_oformat);