Rename var: val -> energy
[FFMpeg-mirror/DVCPRO-HD.git] / libavformat / wav.c
blobffcc4ac6e55895bfb9dbc462181b2aff81599f67
1 /*
2 * WAV muxer and demuxer
3 * Copyright (c) 2001, 2002 Fabrice Bellard.
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #include "avformat.h"
22 #include "raw.h"
23 #include "riff.h"
25 typedef struct {
26 offset_t data;
27 offset_t data_end;
28 int64_t minpts;
29 int64_t maxpts;
30 int last_duration;
31 } WAVContext;
33 #ifdef CONFIG_MUXERS
34 static int wav_write_header(AVFormatContext *s)
36 WAVContext *wav = s->priv_data;
37 ByteIOContext *pb = s->pb;
38 offset_t fmt, fact;
40 put_tag(pb, "RIFF");
41 put_le32(pb, 0); /* file length */
42 put_tag(pb, "WAVE");
44 /* format header */
45 fmt = start_tag(pb, "fmt ");
46 if (put_wav_header(pb, s->streams[0]->codec) < 0) {
47 av_free(wav);
48 return -1;
50 end_tag(pb, fmt);
52 if(s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
53 && !url_is_streamed(s->pb)) {
54 fact = start_tag(pb, "fact");
55 put_le32(pb, 0);
56 end_tag(pb, fact);
59 av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
60 wav->maxpts = wav->last_duration = 0;
61 wav->minpts = INT64_MAX;
63 /* data header */
64 wav->data = start_tag(pb, "data");
66 put_flush_packet(pb);
68 return 0;
71 static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
73 ByteIOContext *pb = s->pb;
74 WAVContext *wav = s->priv_data;
75 put_buffer(pb, pkt->data, pkt->size);
76 if(pkt->pts != AV_NOPTS_VALUE) {
77 wav->minpts = FFMIN(wav->minpts, pkt->pts);
78 wav->maxpts = FFMAX(wav->maxpts, pkt->pts);
79 wav->last_duration = pkt->duration;
80 } else
81 av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
82 return 0;
85 static int wav_write_trailer(AVFormatContext *s)
87 ByteIOContext *pb = s->pb;
88 WAVContext *wav = s->priv_data;
89 offset_t file_size;
91 if (!url_is_streamed(s->pb)) {
92 end_tag(pb, wav->data);
94 /* update file size */
95 file_size = url_ftell(pb);
96 url_fseek(pb, 4, SEEK_SET);
97 put_le32(pb, (uint32_t)(file_size - 8));
98 url_fseek(pb, file_size, SEEK_SET);
100 put_flush_packet(pb);
102 if(s->streams[0]->codec->codec_tag != 0x01) {
103 /* Update num_samps in fact chunk */
104 int number_of_samples;
105 number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
106 s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
107 s->streams[0]->time_base.den);
108 url_fseek(pb, wav->data-12, SEEK_SET);
109 put_le32(pb, number_of_samples);
110 url_fseek(pb, file_size, SEEK_SET);
111 put_flush_packet(pb);
114 return 0;
116 #endif //CONFIG_MUXERS
118 /* return the size of the found tag */
119 /* XXX: > 2GB ? */
120 static int find_tag(ByteIOContext *pb, uint32_t tag1)
122 unsigned int tag;
123 int size;
125 for(;;) {
126 if (url_feof(pb))
127 return -1;
128 tag = get_le32(pb);
129 size = get_le32(pb);
130 if (tag == tag1)
131 break;
132 url_fseek(pb, size, SEEK_CUR);
134 if (size < 0)
135 size = 0x7fffffff;
136 return size;
139 static int wav_probe(AVProbeData *p)
141 /* check file header */
142 if (p->buf_size <= 32)
143 return 0;
144 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
145 p->buf[2] == 'F' && p->buf[3] == 'F' &&
146 p->buf[8] == 'W' && p->buf[9] == 'A' &&
147 p->buf[10] == 'V' && p->buf[11] == 'E')
149 Since ACT demuxer has standard WAV header at top of it's own,
150 returning score is decreased to avoid probe conflict
151 between ACT and WAV.
153 return AVPROBE_SCORE_MAX - 1;
154 else
155 return 0;
158 /* wav input */
159 static int wav_read_header(AVFormatContext *s,
160 AVFormatParameters *ap)
162 int size;
163 unsigned int tag;
164 ByteIOContext *pb = s->pb;
165 AVStream *st;
166 WAVContext *wav = s->priv_data;
168 /* check RIFF header */
169 tag = get_le32(pb);
171 if (tag != MKTAG('R', 'I', 'F', 'F'))
172 return -1;
173 get_le32(pb); /* file size */
174 tag = get_le32(pb);
175 if (tag != MKTAG('W', 'A', 'V', 'E'))
176 return -1;
178 /* parse fmt header */
179 size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
180 if (size < 0)
181 return -1;
182 st = av_new_stream(s, 0);
183 if (!st)
184 return AVERROR(ENOMEM);
186 get_wav_header(pb, st->codec, size);
187 st->need_parsing = AVSTREAM_PARSE_FULL;
189 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
191 size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
192 if (size < 0)
193 return -1;
194 wav->data_end= url_ftell(pb) + size;
195 return 0;
198 #define MAX_SIZE 4096
200 static int wav_read_packet(AVFormatContext *s,
201 AVPacket *pkt)
203 int ret, size, left;
204 AVStream *st;
205 WAVContext *wav = s->priv_data;
207 if (url_feof(s->pb))
208 return AVERROR(EIO);
209 st = s->streams[0];
211 left= wav->data_end - url_ftell(s->pb);
212 if(left <= 0){
213 left = find_tag(s->pb, MKTAG('d', 'a', 't', 'a'));
214 if (left < 0) {
215 return AVERROR(EIO);
217 wav->data_end= url_ftell(s->pb) + left;
220 size = MAX_SIZE;
221 if (st->codec->block_align > 1) {
222 if (size < st->codec->block_align)
223 size = st->codec->block_align;
224 size = (size / st->codec->block_align) * st->codec->block_align;
226 size= FFMIN(size, left);
227 ret= av_get_packet(s->pb, pkt, size);
228 if (ret <= 0)
229 return AVERROR(EIO);
230 pkt->stream_index = 0;
232 /* note: we need to modify the packet size here to handle the last
233 packet */
234 pkt->size = ret;
235 return ret;
238 static int wav_read_close(AVFormatContext *s)
240 return 0;
243 static int wav_read_seek(AVFormatContext *s,
244 int stream_index, int64_t timestamp, int flags)
246 AVStream *st;
248 st = s->streams[0];
249 switch(st->codec->codec_id) {
250 case CODEC_ID_MP2:
251 case CODEC_ID_MP3:
252 case CODEC_ID_AC3:
253 case CODEC_ID_DTS:
254 /* use generic seeking with dynamically generated indexes */
255 return -1;
256 default:
257 break;
259 return pcm_read_seek(s, stream_index, timestamp, flags);
262 #ifdef CONFIG_WAV_DEMUXER
263 AVInputFormat wav_demuxer = {
264 "wav",
265 "wav format",
266 sizeof(WAVContext),
267 wav_probe,
268 wav_read_header,
269 wav_read_packet,
270 wav_read_close,
271 wav_read_seek,
272 .flags= AVFMT_GENERIC_INDEX,
273 .codec_tag= (const AVCodecTag*[]){codec_wav_tags, 0},
275 #endif
276 #ifdef CONFIG_WAV_MUXER
277 AVOutputFormat wav_muxer = {
278 "wav",
279 "wav format",
280 "audio/x-wav",
281 "wav",
282 sizeof(WAVContext),
283 CODEC_ID_PCM_S16LE,
284 CODEC_ID_NONE,
285 wav_write_header,
286 wav_write_packet,
287 wav_write_trailer,
288 .codec_tag= (const AVCodecTag*[]){codec_wav_tags, 0},
290 #endif