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
|
/*
* WavPack demuxer
* Copyright (c) 2006 Konstantin Shishkov.
*
* 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 "bswap.h"
// specs say that maximum block size is 1Mb
#define WV_BLOCK_LIMIT 1047576
#define WV_EXTRA_SIZE 12
enum WV_FLAGS{
WV_MONO = 0x0004,
WV_HYBRID = 0x0008,
WV_JOINT = 0x0010,
WV_CROSSD = 0x0020,
WV_HSHAPE = 0x0040,
WV_FLOAT = 0x0080,
WV_INT32 = 0x0100,
WV_HBR = 0x0200,
WV_HBAL = 0x0400,
WV_MCINIT = 0x0800,
WV_MCEND = 0x1000,
};
static const int wv_rates[16] = {
6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
32000, 44100, 48000, 64000, 88200, 96000, 192000, -1
};
typedef struct{
uint32_t blksize, flags;
int rate, chan, bpp;
uint32_t samples, soff;
int block_parsed;
uint8_t extra[WV_EXTRA_SIZE];
int64_t pos;
}WVContext;
static int wv_probe(AVProbeData *p)
{
/* check file header */
if (p->buf_size <= 32)
return 0;
if (p->buf[0] == 'w' && p->buf[1] == 'v' &&
p->buf[2] == 'p' && p->buf[3] == 'k')
return AVPROBE_SCORE_MAX;
else
return 0;
}
static int wv_read_block_header(AVFormatContext *ctx, ByteIOContext *pb)
{
WVContext *wc = ctx->priv_data;
uint32_t tag, ver;
int size;
int rate, bpp, chan;
wc->pos = url_ftell(pb);
tag = get_le32(pb);
if (tag != MKTAG('w', 'v', 'p', 'k'))
return -1;
size = get_le32(pb);
if(size < 24 || size > WV_BLOCK_LIMIT){
av_log(ctx, AV_LOG_ERROR, "Incorrect block size %i\n", size);
return -1;
}
wc->blksize = size;
ver = get_le16(pb);
if(ver < 0x402 || ver > 0x410){
av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
return -1;
}
get_byte(pb); // track no
get_byte(pb); // track sub index
wc->samples = get_le32(pb); // total samples in file
wc->soff = get_le32(pb); // offset in samples of current block
get_buffer(pb, wc->extra, WV_EXTRA_SIZE);
wc->flags = AV_RL32(wc->extra + 4);
//parse flags
if(wc->flags & WV_FLOAT){
av_log(ctx, AV_LOG_ERROR, "Floating point data is not supported\n");
return -1;
}
if(wc->flags & WV_HYBRID){
av_log(ctx, AV_LOG_ERROR, "Hybrid coding mode is not supported\n");
return -1;
}
bpp = ((wc->flags & 3) + 1) << 3;
chan = 1 + !(wc->flags & WV_MONO);
rate = wv_rates[(wc->flags >> 23) & 0xF];
if(rate == -1){
av_log(ctx, AV_LOG_ERROR, "Unknown sampling rate\n");
return -1;
}
if(!wc->bpp) wc->bpp = bpp;
if(!wc->chan) wc->chan = chan;
if(!wc->rate) wc->rate = rate;
if(wc->flags && bpp != wc->bpp){
av_log(ctx, AV_LOG_ERROR, "Bits per sample differ, this block: %i, header block: %i\n", bpp, wc->bpp);
return -1;
}
if(wc->flags && chan != wc->chan){
av_log(ctx, AV_LOG_ERROR, "Channels differ, this block: %i, header block: %i\n", chan, wc->chan);
return -1;
}
if(wc->flags && rate != wc->rate){
av_log(ctx, AV_LOG_ERROR, "Sampling rate differ, this block: %i, header block: %i\n", rate, wc->rate);
return -1;
}
wc->blksize = size - 24;
return 0;
}
static int wv_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
ByteIOContext *pb = &s->pb;
WVContext *wc = s->priv_data;
AVStream *st;
if(wv_read_block_header(s, pb) < 0)
return -1;
wc->block_parsed = 0;
/* now we are ready: build format streams */
st = av_new_stream(s, 0);
if (!st)
return -1;
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_WAVPACK;
st->codec->channels = wc->chan;
st->codec->sample_rate = wc->rate;
st->codec->bits_per_sample = wc->bpp;
av_set_pts_info(st, 64, 1, wc->rate);
s->start_time = 0;
s->duration = (int64_t)wc->samples * AV_TIME_BASE / st->codec->sample_rate;
return 0;
}
static int wv_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
WVContext *wc = s->priv_data;
int ret;
if (url_feof(&s->pb))
return AVERROR(EIO);
if(wc->block_parsed){
if(wv_read_block_header(s, &s->pb) < 0)
return -1;
}
if(av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE) < 0)
return AVERROR(ENOMEM);
memcpy(pkt->data, wc->extra, WV_EXTRA_SIZE);
ret = get_buffer(&s->pb, pkt->data + WV_EXTRA_SIZE, wc->blksize);
if(ret != wc->blksize){
av_free_packet(pkt);
return AVERROR(EIO);
}
pkt->stream_index = 0;
wc->block_parsed = 1;
pkt->size = ret + WV_EXTRA_SIZE;
pkt->pts = wc->soff;
av_add_index_entry(s->streams[0], wc->pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
return 0;
}
static int wv_read_close(AVFormatContext *s)
{
return 0;
}
static int wv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
{
AVStream *st = s->streams[stream_index];
WVContext *wc = s->priv_data;
AVPacket pkt1, *pkt = &pkt1;
int ret;
int index = av_index_search_timestamp(st, timestamp, flags);
int64_t pos, pts;
/* if found, seek there */
if (index >= 0){
wc->block_parsed = 1;
url_fseek(&s->pb, st->index_entries[index].pos, SEEK_SET);
return 0;
}
/* if timestamp is out of bounds, return error */
if(timestamp < 0 || timestamp >= s->duration)
return -1;
pos = url_ftell(&s->pb);
do{
ret = av_read_frame(s, pkt);
if (ret < 0){
url_fseek(&s->pb, pos, SEEK_SET);
return -1;
}
pts = pkt->pts;
av_free_packet(pkt);
}while(pts < timestamp);
return 0;
}
AVInputFormat wv_demuxer = {
"wv",
"WavPack",
sizeof(WVContext),
wv_probe,
wv_read_header,
wv_read_packet,
wv_read_close,
wv_read_seek,
};
|
