summaryrefslogtreecommitdiff
path: root/libavformat/wav.c
blob: cb748a9dcbc8f62b699a92c587d491f89756fd15 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
/*
 * WAV muxer and demuxer
 * Copyright (c) 2001, 2002 Fabrice Bellard.
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
#include "avformat.h"
#include "allformats.h"
#include "riff.h"

typedef struct {
    offset_t data;
    offset_t data_end;
    int64_t minpts;
    int64_t maxpts;
    int last_duration;
} WAVContext;

#ifdef CONFIG_MUXERS
static int wav_write_header(AVFormatContext *s)
{
    WAVContext *wav = s->priv_data;
    ByteIOContext *pb = &s->pb;
    offset_t fmt, fact;

    put_tag(pb, "RIFF");
    put_le32(pb, 0); /* file length */
    put_tag(pb, "WAVE");

    /* format header */
    fmt = start_tag(pb, "fmt ");
    if (put_wav_header(pb, s->streams[0]->codec) < 0) {
        av_free(wav);
        return -1;
    }
    end_tag(pb, fmt);

    if(s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
       && !url_is_streamed(&s->pb)) {
        fact = start_tag(pb, "fact");
        put_le32(pb, 0);
        end_tag(pb, fact);
    }

    av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
    wav->maxpts = wav->last_duration = 0;
    wav->minpts = INT64_MAX;

    /* data header */
    wav->data = start_tag(pb, "data");

    put_flush_packet(pb);

    return 0;
}

static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    ByteIOContext *pb = &s->pb;
    WAVContext *wav = s->priv_data;
    put_buffer(pb, pkt->data, pkt->size);
    if(pkt->pts != AV_NOPTS_VALUE) {
        wav->minpts = FFMIN(wav->minpts, pkt->pts);
        wav->maxpts = FFMAX(wav->maxpts, pkt->pts);
        wav->last_duration = pkt->duration;
    } else
        av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
    return 0;
}

static int wav_write_trailer(AVFormatContext *s)
{
    ByteIOContext *pb = &s->pb;
    WAVContext *wav = s->priv_data;
    offset_t file_size;

    if (!url_is_streamed(&s->pb)) {
        end_tag(pb, wav->data);

        /* update file size */
        file_size = url_ftell(pb);
        url_fseek(pb, 4, SEEK_SET);
        put_le32(pb, (uint32_t)(file_size - 8));
        url_fseek(pb, file_size, SEEK_SET);

        put_flush_packet(pb);

        if(s->streams[0]->codec->codec_tag != 0x01) {
            /* Update num_samps in fact chunk */
            int number_of_samples;
            number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
                                           s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
                                           s->streams[0]->time_base.den);
            url_fseek(pb, wav->data-12, SEEK_SET);
            put_le32(pb, number_of_samples);
            url_fseek(pb, file_size, SEEK_SET);
            put_flush_packet(pb);
        }
    }
    return 0;
}
#endif //CONFIG_MUXERS

/* return the size of the found tag */
/* XXX: > 2GB ? */
static int find_tag(ByteIOContext *pb, uint32_t tag1)
{
    unsigned int tag;
    int size;

    for(;;) {
        if (url_feof(pb))
            return -1;
        tag = get_le32(pb);
        size = get_le32(pb);
        if (tag == tag1)
            break;
        url_fseek(pb, size, SEEK_CUR);
    }
    if (size < 0)
        size = 0x7fffffff;
    return size;
}

static int wav_probe(AVProbeData *p)
{
    /* check file header */
    if (p->buf_size <= 32)
        return 0;
    if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
        p->buf[2] == 'F' && p->buf[3] == 'F' &&
        p->buf[8] == 'W' && p->buf[9] == 'A' &&
        p->buf[10] == 'V' && p->buf[11] == 'E')
        return AVPROBE_SCORE_MAX;
    else
        return 0;
}

/* wav input */
static int wav_read_header(AVFormatContext *s,
                           AVFormatParameters *ap)
{
    int size;
    unsigned int tag;
    ByteIOContext *pb = &s->pb;
    AVStream *st;
    WAVContext *wav = s->priv_data;

    /* check RIFF header */
    tag = get_le32(pb);

    if (tag != MKTAG('R', 'I', 'F', 'F'))
        return -1;
    get_le32(pb); /* file size */
    tag = get_le32(pb);
    if (tag != MKTAG('W', 'A', 'V', 'E'))
        return -1;

    /* parse fmt header */
    size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
    if (size < 0)
        return -1;
    st = av_new_stream(s, 0);
    if (!st)
        return AVERROR(ENOMEM);

    get_wav_header(pb, st->codec, size);
    st->need_parsing = AVSTREAM_PARSE_FULL;

    av_set_pts_info(st, 64, 1, st->codec->sample_rate);

    size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
    if (size < 0)
        return -1;
    wav->data_end= url_ftell(pb) + size;
    return 0;
}

#define MAX_SIZE 4096

static int wav_read_packet(AVFormatContext *s,
                           AVPacket *pkt)
{
    int ret, size, left;
    AVStream *st;
    WAVContext *wav = s->priv_data;

    if (url_feof(&s->pb))
        return AVERROR(EIO);
    st = s->streams[0];

    left= wav->data_end - url_ftell(&s->pb);
    if(left <= 0){
        left = find_tag(&(s->pb), MKTAG('d', 'a', 't', 'a'));
        if (left < 0) {
            return AVERROR(EIO);
        }
        wav->data_end= url_ftell(&s->pb) + left;
    }

    size = MAX_SIZE;
    if (st->codec->block_align > 1) {
        if (size < st->codec->block_align)
            size = st->codec->block_align;
        size = (size / st->codec->block_align) * st->codec->block_align;
    }
    size= FFMIN(size, left);
    ret= av_get_packet(&s->pb, pkt, size);
    if (ret <= 0)
        return AVERROR(EIO);
    pkt->stream_index = 0;

    /* note: we need to modify the packet size here to handle the last
       packet */
    pkt->size = ret;
    return ret;
}

static int wav_read_close(AVFormatContext *s)
{
    return 0;
}

static int wav_read_seek(AVFormatContext *s,
                         int stream_index, int64_t timestamp, int flags)
{
    AVStream *st;

    st = s->streams[0];
    switch(st->codec->codec_id) {
    case CODEC_ID_MP2:
    case CODEC_ID_MP3:
    case CODEC_ID_AC3:
    case CODEC_ID_DTS:
        /* use generic seeking with dynamically generated indexes */
        return -1;
    default:
        break;
    }
    return pcm_read_seek(s, stream_index, timestamp, flags);
}

#ifdef CONFIG_WAV_DEMUXER
AVInputFormat wav_demuxer = {
    "wav",
    "wav format",
    sizeof(WAVContext),
    wav_probe,
    wav_read_header,
    wav_read_packet,
    wav_read_close,
    wav_read_seek,
    .flags= AVFMT_GENERIC_INDEX,
    .codec_tag= (const AVCodecTag*[]){codec_wav_tags, 0},
};
#endif
#ifdef CONFIG_WAV_MUXER
AVOutputFormat wav_muxer = {
    "wav",
    "wav format",
    "audio/x-wav",
    "wav",
    sizeof(WAVContext),
    CODEC_ID_PCM_S16LE,
    CODEC_ID_NONE,
    wav_write_header,
    wav_write_packet,
    wav_write_trailer,
    .codec_tag= (const AVCodecTag*[]){codec_wav_tags, 0},
};
#endif