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_MP3LAME, 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_WMAV1, 0x160 },
33 { CODEC_ID_WMAV2, 0x161 },
37 /* WAVEFORMATEX header */
38 /* returns the size or -1 on error */
39 int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
41 int tag, bps, blkalign, bytespersec;
44 tag = codec_get_tag(codec_wav_tags, enc->codec_id);
48 put_le16(pb, enc->channels);
49 put_le32(pb, enc->sample_rate);
50 if (enc->codec_id == CODEC_ID_PCM_U8 ||
51 enc->codec_id == CODEC_ID_PCM_ALAW ||
52 enc->codec_id == CODEC_ID_PCM_MULAW) {
54 } else if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3LAME) {
56 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV || enc->codec_id == CODEC_ID_ADPCM_MS) {
62 if (enc->codec_id == CODEC_ID_MP2 || enc->codec_id == CODEC_ID_MP3LAME) {
64 //blkalign = 144 * enc->bit_rate/enc->sample_rate;
65 } else if (enc->block_align != 0) { /* specified by the codec */
66 blkalign = enc->block_align;
68 blkalign = enc->channels*bps >> 3;
69 if (enc->codec_id == CODEC_ID_PCM_U8 ||
70 enc->codec_id == CODEC_ID_PCM_S16LE) {
71 bytespersec = enc->sample_rate * blkalign;
73 bytespersec = enc->bit_rate / 8;
75 put_le32(pb, bytespersec); /* bytes per second */
76 put_le16(pb, blkalign); /* block align */
77 put_le16(pb, bps); /* bits per sample */
78 if (enc->codec_id == CODEC_ID_MP3LAME) {
79 put_le16(pb, 12); /* wav_extra_size */
81 put_le16(pb, 1); /* wID */
82 put_le32(pb, 2); /* fdwFlags */
83 put_le16(pb, 1152); /* nBlockSize */
84 put_le16(pb, 1); /* nFramesPerBlock */
85 put_le16(pb, 1393); /* nCodecDelay */
86 } else if (enc->codec_id == CODEC_ID_MP2) {
87 put_le16(pb, 22); /* wav_extra_size */
89 put_le16(pb, 2); /* fwHeadLayer */
90 put_le32(pb, enc->bit_rate); /* dwHeadBitrate */
91 put_le16(pb, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
92 put_le16(pb, 0); /* fwHeadModeExt */
93 put_le16(pb, 1); /* wHeadEmphasis */
94 put_le16(pb, 16); /* fwHeadFlags */
95 put_le32(pb, 0); /* dwPTSLow */
96 put_le32(pb, 0); /* dwPTSHigh */
97 } else if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
98 put_le16(pb, 2); /* wav_extra_size */
99 put_le16(pb, ((enc->block_align - 4 * enc->channels) / (4 * enc->channels)) * 8 + 1); /* wSamplesPerBlock */
101 put_le16(pb, 0); /* wav_extra_size */
106 void get_wav_header(ByteIOContext *pb, AVCodecContext *codec,
112 codec->codec_type = CODEC_TYPE_AUDIO;
113 codec->codec_tag = id;
115 codec->channels = get_le16(pb);
116 codec->sample_rate = get_le32(pb);
117 codec->bit_rate = get_le32(pb) * 8;
118 codec->block_align = get_le16(pb);
119 codec->frame_bits = get_le16(pb); /* bits per sample */
120 codec->codec_id = wav_codec_get_id(id, codec->frame_bits);
121 if (has_extra_data) {
122 codec->extradata_size = get_le16(pb);
123 if (codec->extradata_size > 0) {
124 codec->extradata = av_mallocz(codec->extradata_size);
125 get_buffer(pb, codec->extradata, codec->extradata_size);
131 int wav_codec_get_id(unsigned int tag, int bps)
134 id = codec_get_id(codec_wav_tags, tag);
137 /* handle specific u8 codec */
138 if (id == CODEC_ID_PCM_S16LE && bps == 8)
139 id = CODEC_ID_PCM_U8;
147 static int wav_write_header(AVFormatContext *s)
149 WAVContext *wav = s->priv_data;
150 ByteIOContext *pb = &s->pb;
154 put_le32(pb, 0); /* file length */
158 fmt = start_tag(pb, "fmt ");
159 if (put_wav_header(pb, &s->streams[0]->codec) < 0) {
166 wav->data = start_tag(pb, "data");
168 put_flush_packet(pb);
173 static int wav_write_packet(AVFormatContext *s, int stream_index_ptr,
174 UINT8 *buf, int size, int force_pts)
176 ByteIOContext *pb = &s->pb;
177 put_buffer(pb, buf, size);
181 static int wav_write_trailer(AVFormatContext *s)
183 ByteIOContext *pb = &s->pb;
184 WAVContext *wav = s->priv_data;
187 if (!url_is_streamed(&s->pb)) {
188 end_tag(pb, wav->data);
190 /* update file size */
191 file_size = url_ftell(pb);
192 url_fseek(pb, 4, SEEK_SET);
193 put_le32(pb, (UINT32)(file_size - 8));
194 url_fseek(pb, file_size, SEEK_SET);
196 put_flush_packet(pb);
201 /* return the size of the found tag */
203 static int find_tag(ByteIOContext *pb, UINT32 tag1)
215 url_fseek(pb, size, SEEK_CUR);
222 static int wav_probe(AVProbeData *p)
224 /* check file header */
225 if (p->buf_size <= 32)
227 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
228 p->buf[2] == 'F' && p->buf[3] == 'F' &&
229 p->buf[8] == 'W' && p->buf[9] == 'A' &&
230 p->buf[10] == 'V' && p->buf[11] == 'E')
231 return AVPROBE_SCORE_MAX;
237 static int wav_read_header(AVFormatContext *s,
238 AVFormatParameters *ap)
242 ByteIOContext *pb = &s->pb;
245 /* check RIFF header */
248 if (tag != MKTAG('R', 'I', 'F', 'F'))
250 get_le32(pb); /* file size */
252 if (tag != MKTAG('W', 'A', 'V', 'E'))
255 /* parse fmt header */
256 size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
259 st = av_new_stream(s, 0);
261 return AVERROR_NOMEM;
263 get_wav_header(pb, &st->codec, (size >= 18));
265 size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
271 #define MAX_SIZE 4096
273 static int wav_read_packet(AVFormatContext *s,
278 if (url_feof(&s->pb))
280 if (av_new_packet(pkt, MAX_SIZE))
282 pkt->stream_index = 0;
284 ret = get_buffer(&s->pb, pkt->data, pkt->size);
287 /* note: we need to modify the packet size here to handle the last
293 static int wav_read_close(AVFormatContext *s)
298 static AVInputFormat wav_iformat = {
308 static AVOutputFormat wav_oformat = {
323 av_register_input_format(&wav_iformat);
324 av_register_output_format(&wav_oformat);