1.1.10
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn33713 |
1 |
/*
|
2 |
* Musepack demuxer
|
|
3 |
* Copyright (c) 2006 Konstantin Shishkov
|
|
4 |
*
|
|
5 |
* This file is part of Libav.
|
|
6 |
*
|
|
7 |
* Libav 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.
|
|
11 |
*
|
|
12 |
* Libav 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.
|
|
16 |
*
|
|
17 |
* You should have received a copy of the GNU Lesser General Public
|
|
18 |
* License along with Libav; if not, write to the Free Software
|
|
19 |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
20 |
*/
|
|
21 |
||
22 |
#include "libavcodec/get_bits.h" |
|
23 |
#include "avformat.h" |
|
1.1.11
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn34492 |
24 |
#include "internal.h" |
1.1.10
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn33713 |
25 |
#include "apetag.h" |
26 |
#include "id3v1.h" |
|
27 |
#include "libavutil/dict.h" |
|
28 |
||
29 |
#define MPC_FRAMESIZE 1152
|
|
30 |
#define DELAY_FRAMES 32
|
|
31 |
||
32 |
static const int mpc_rate[4] = { 44100, 48000, 37800, 32000 }; |
|
33 |
typedef struct { |
|
34 |
int64_t pos; |
|
35 |
int size, skip; |
|
36 |
}MPCFrame; |
|
37 |
||
38 |
typedef struct { |
|
39 |
int ver; |
|
40 |
uint32_t curframe, lastframe; |
|
41 |
uint32_t fcount; |
|
42 |
MPCFrame *frames; |
|
43 |
int curbits; |
|
44 |
int frames_noted; |
|
45 |
} MPCContext; |
|
46 |
||
47 |
static int mpc_probe(AVProbeData *p) |
|
48 |
{
|
|
49 |
const uint8_t *d = p->buf; |
|
50 |
if (d[0] == 'M' && d[1] == 'P' && d[2] == '+' && (d[3] == 0x17 || d[3] == 0x7)) |
|
51 |
return AVPROBE_SCORE_MAX; |
|
52 |
return 0; |
|
53 |
}
|
|
54 |
||
55 |
static int mpc_read_header(AVFormatContext *s, AVFormatParameters *ap) |
|
56 |
{
|
|
57 |
MPCContext *c = s->priv_data; |
|
58 |
AVStream *st; |
|
59 |
||
60 |
if(avio_rl24(s->pb) != MKTAG('M', 'P', '+', 0)){ |
|
61 |
av_log(s, AV_LOG_ERROR, "Not a Musepack file\n"); |
|
62 |
return -1; |
|
63 |
}
|
|
64 |
c->ver = avio_r8(s->pb); |
|
65 |
if(c->ver != 0x07 && c->ver != 0x17){ |
|
66 |
av_log(s, AV_LOG_ERROR, "Can demux Musepack SV7, got version %02X\n", c->ver); |
|
67 |
return -1; |
|
68 |
}
|
|
69 |
c->fcount = avio_rl32(s->pb); |
|
70 |
if((int64_t)c->fcount * sizeof(MPCFrame) >= UINT_MAX){ |
|
71 |
av_log(s, AV_LOG_ERROR, "Too many frames, seeking is not possible\n"); |
|
72 |
return -1; |
|
73 |
}
|
|
1.1.11
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn34492 |
74 |
if(c->fcount){ |
75 |
c->frames = av_malloc(c->fcount * sizeof(MPCFrame)); |
|
76 |
if(!c->frames){ |
|
77 |
av_log(s, AV_LOG_ERROR, "Cannot allocate seektable\n"); |
|
78 |
return AVERROR(ENOMEM); |
|
79 |
}
|
|
80 |
}else{ |
|
81 |
av_log(s, AV_LOG_WARNING, "Container reports no frames\n"); |
|
82 |
}
|
|
1.1.10
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn33713 |
83 |
c->curframe = 0; |
84 |
c->lastframe = -1; |
|
85 |
c->curbits = 8; |
|
86 |
c->frames_noted = 0; |
|
87 |
||
1.1.11
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn34492 |
88 |
st = avformat_new_stream(s, NULL); |
1.1.10
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn33713 |
89 |
if (!st) |
90 |
return AVERROR(ENOMEM); |
|
91 |
st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
|
92 |
st->codec->codec_id = CODEC_ID_MUSEPACK7; |
|
93 |
st->codec->channels = 2; |
|
94 |
st->codec->bits_per_coded_sample = 16; |
|
95 |
||
96 |
st->codec->extradata_size = 16; |
|
97 |
st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE); |
|
98 |
avio_read(s->pb, st->codec->extradata, 16); |
|
99 |
st->codec->sample_rate = mpc_rate[st->codec->extradata[2] & 3]; |
|
1.1.11
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn34492 |
100 |
avpriv_set_pts_info(st, 32, MPC_FRAMESIZE, st->codec->sample_rate); |
1.1.10
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn33713 |
101 |
/* scan for seekpoints */
|
102 |
st->start_time = 0; |
|
103 |
st->duration = c->fcount; |
|
104 |
||
105 |
/* try to read APE tags */
|
|
106 |
if (s->pb->seekable) { |
|
107 |
int64_t pos = avio_tell(s->pb); |
|
108 |
ff_ape_parse_tag(s); |
|
109 |
if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) |
|
110 |
ff_id3v1_read(s); |
|
111 |
avio_seek(s->pb, pos, SEEK_SET); |
|
112 |
}
|
|
113 |
||
114 |
return 0; |
|
115 |
}
|
|
116 |
||
117 |
static int mpc_read_packet(AVFormatContext *s, AVPacket *pkt) |
|
118 |
{
|
|
119 |
MPCContext *c = s->priv_data; |
|
120 |
int ret, size, size2, curbits, cur = c->curframe; |
|
1.1.11
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn34492 |
121 |
unsigned tmp; |
122 |
int64_t pos; |
|
1.1.10
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn33713 |
123 |
|
1.1.11
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn34492 |
124 |
if (c->curframe >= c->fcount && c->fcount) |
1.1.10
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn33713 |
125 |
return -1; |
126 |
||
127 |
if(c->curframe != c->lastframe + 1){ |
|
128 |
avio_seek(s->pb, c->frames[c->curframe].pos, SEEK_SET); |
|
129 |
c->curbits = c->frames[c->curframe].skip; |
|
130 |
}
|
|
131 |
c->lastframe = c->curframe; |
|
132 |
c->curframe++; |
|
133 |
curbits = c->curbits; |
|
134 |
pos = avio_tell(s->pb); |
|
135 |
tmp = avio_rl32(s->pb); |
|
136 |
if(curbits <= 12){ |
|
137 |
size2 = (tmp >> (12 - curbits)) & 0xFFFFF; |
|
138 |
}else{ |
|
1.1.11
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn34492 |
139 |
size2 = (tmp << (curbits - 12) | avio_rl32(s->pb) >> (44 - curbits)) & 0xFFFFF; |
1.1.10
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn33713 |
140 |
}
|
141 |
curbits += 20; |
|
142 |
avio_seek(s->pb, pos, SEEK_SET); |
|
143 |
||
144 |
size = ((size2 + curbits + 31) & ~31) >> 3; |
|
1.1.11
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn34492 |
145 |
if(cur == c->frames_noted && c->fcount){ |
1.1.10
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn33713 |
146 |
c->frames[cur].pos = pos; |
147 |
c->frames[cur].size = size; |
|
148 |
c->frames[cur].skip = curbits - 20; |
|
149 |
av_add_index_entry(s->streams[0], cur, cur, size, 0, AVINDEX_KEYFRAME); |
|
150 |
c->frames_noted++; |
|
151 |
}
|
|
152 |
c->curbits = (curbits + size2) & 0x1F; |
|
153 |
||
154 |
if (av_new_packet(pkt, size) < 0) |
|
155 |
return AVERROR(EIO); |
|
156 |
||
157 |
pkt->data[0] = curbits; |
|
1.1.11
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn34492 |
158 |
pkt->data[1] = (c->curframe > c->fcount) && c->fcount; |
1.1.10
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn33713 |
159 |
pkt->data[2] = 0; |
160 |
pkt->data[3] = 0; |
|
161 |
||
162 |
pkt->stream_index = 0; |
|
163 |
pkt->pts = cur; |
|
164 |
ret = avio_read(s->pb, pkt->data + 4, size); |
|
165 |
if(c->curbits) |
|
166 |
avio_seek(s->pb, -4, SEEK_CUR); |
|
167 |
if(ret < size){ |
|
168 |
av_free_packet(pkt); |
|
169 |
return AVERROR(EIO); |
|
170 |
}
|
|
171 |
pkt->size = ret + 4; |
|
172 |
||
173 |
return 0; |
|
174 |
}
|
|
175 |
||
176 |
static int mpc_read_close(AVFormatContext *s) |
|
177 |
{
|
|
178 |
MPCContext *c = s->priv_data; |
|
179 |
||
180 |
av_freep(&c->frames); |
|
181 |
return 0; |
|
182 |
}
|
|
183 |
||
184 |
/**
|
|
185 |
* Seek to the given position
|
|
186 |
* If position is unknown but is within the limits of file
|
|
187 |
* then packets are skipped unless desired position is reached
|
|
188 |
*
|
|
189 |
* Also this function makes use of the fact that timestamp == frameno
|
|
190 |
*/
|
|
191 |
static int mpc_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) |
|
192 |
{
|
|
193 |
AVStream *st = s->streams[stream_index]; |
|
194 |
MPCContext *c = s->priv_data; |
|
195 |
AVPacket pkt1, *pkt = &pkt1; |
|
196 |
int ret; |
|
197 |
int index = av_index_search_timestamp(st, timestamp - DELAY_FRAMES, flags); |
|
198 |
uint32_t lastframe; |
|
199 |
||
200 |
/* if found, seek there */
|
|
201 |
if (index >= 0){ |
|
202 |
c->curframe = st->index_entries[index].pos; |
|
203 |
return 0; |
|
204 |
}
|
|
205 |
/* if timestamp is out of bounds, return error */
|
|
206 |
if(timestamp < 0 || timestamp >= c->fcount) |
|
207 |
return -1; |
|
208 |
timestamp -= DELAY_FRAMES; |
|
209 |
/* seek to the furthest known position and read packets until
|
|
210 |
we reach desired position */
|
|
211 |
lastframe = c->curframe; |
|
212 |
if(c->frames_noted) c->curframe = c->frames_noted - 1; |
|
213 |
while(c->curframe < timestamp){ |
|
214 |
ret = av_read_frame(s, pkt); |
|
215 |
if (ret < 0){ |
|
216 |
c->curframe = lastframe; |
|
217 |
return -1; |
|
218 |
}
|
|
219 |
av_free_packet(pkt); |
|
220 |
}
|
|
221 |
return 0; |
|
222 |
}
|
|
223 |
||
224 |
||
225 |
AVInputFormat ff_mpc_demuxer = { |
|
1.1.11
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn34492 |
226 |
.name = "mpc", |
227 |
.long_name = NULL_IF_CONFIG_SMALL("Musepack"), |
|
228 |
.priv_data_size = sizeof(MPCContext), |
|
229 |
.read_probe = mpc_probe, |
|
230 |
.read_header = mpc_read_header, |
|
231 |
.read_packet = mpc_read_packet, |
|
232 |
.read_close = mpc_read_close, |
|
233 |
.read_seek = mpc_read_seek, |
|
1.1.10
by Reinhard Tartler
Import upstream version 1.0~rc4.dfsg1+svn33713 |
234 |
.extensions = "mpc", |
235 |
};
|