Move APE tag parsing into separate module.
[libav.git] / libavformat / mpc.c
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1/*
2 * Musepack demuxer
3 * Copyright (c) 2006 Konstantin Shishkov
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
e5a389a1 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
185c7b6b 20 */
245976da 21
9106a698 22#include "libavcodec/get_bits.h"
185c7b6b 23#include "avformat.h"
ac3ef4a4 24#include "id3v2.h"
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25
26#define MPC_FRAMESIZE 1152
aac88b53 27#define DELAY_FRAMES 32
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28
29static const int mpc_rate[4] = { 44100, 48000, 37800, 32000 };
30typedef struct {
31 int64_t pos;
32 int size, skip;
33}MPCFrame;
34
35typedef struct {
36 int ver;
37 uint32_t curframe, lastframe;
38 uint32_t fcount;
39 MPCFrame *frames;
40 int curbits;
41 int frames_noted;
42} MPCContext;
43
44static int mpc_probe(AVProbeData *p)
45{
46 const uint8_t *d = p->buf;
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47 if (ff_id3v2_match(d)) {
48 d += ff_id3v2_tag_len(d);
49 }
50 if (d+3 < p->buf+p->buf_size)
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51 if (d[0] == 'M' && d[1] == 'P' && d[2] == '+' && (d[3] == 0x17 || d[3] == 0x7))
52 return AVPROBE_SCORE_MAX;
53 return 0;
54}
55
56static int mpc_read_header(AVFormatContext *s, AVFormatParameters *ap)
57{
58 MPCContext *c = s->priv_data;
59 AVStream *st;
0587b0ca 60 int t;
185c7b6b 61
899681cd 62 t = get_le24(s->pb);
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63 if(t != MKTAG('M', 'P', '+', 0)){
64 if(t != MKTAG('I', 'D', '3', 0)){
65 av_log(s, AV_LOG_ERROR, "Not a Musepack file\n");
66 return -1;
67 }
68 /* skip ID3 tags and try again */
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69 url_fskip(s->pb, 3);
70 t = get_byte(s->pb) << 21;
71 t |= get_byte(s->pb) << 14;
72 t |= get_byte(s->pb) << 7;
73 t |= get_byte(s->pb);
0587b0ca 74 av_log(s, AV_LOG_DEBUG, "Skipping %d(%X) bytes of ID3 data\n", t, t);
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75 url_fskip(s->pb, t);
76 if(get_le24(s->pb) != MKTAG('M', 'P', '+', 0)){
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77 av_log(s, AV_LOG_ERROR, "Not a Musepack file\n");
78 return -1;
79 }
185c7b6b 80 }
899681cd 81 c->ver = get_byte(s->pb);
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82 if(c->ver != 0x07 && c->ver != 0x17){
83 av_log(s, AV_LOG_ERROR, "Can demux Musepack SV7, got version %02X\n", c->ver);
84 return -1;
85 }
899681cd 86 c->fcount = get_le32(s->pb);
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87 if((int64_t)c->fcount * sizeof(MPCFrame) >= UINT_MAX){
88 av_log(s, AV_LOG_ERROR, "Too many frames, seeking is not possible\n");
89 return -1;
90 }
91 c->frames = av_malloc(c->fcount * sizeof(MPCFrame));
92 c->curframe = 0;
93 c->lastframe = -1;
94 c->curbits = 8;
e3113632 95 c->frames_noted = 0;
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96
97 st = av_new_stream(s, 0);
98 if (!st)
769e10f0 99 return AVERROR(ENOMEM);
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100 st->codec->codec_type = CODEC_TYPE_AUDIO;
101 st->codec->codec_id = CODEC_ID_MUSEPACK7;
102 st->codec->channels = 2;
dd1c8f3e 103 st->codec->bits_per_coded_sample = 16;
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104
105 st->codec->extradata_size = 16;
106 st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE);
899681cd 107 get_buffer(s->pb, st->codec->extradata, 16);
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108 st->codec->sample_rate = mpc_rate[st->codec->extradata[2] & 3];
109 av_set_pts_info(st, 32, MPC_FRAMESIZE, st->codec->sample_rate);
110 /* scan for seekpoints */
111 s->start_time = 0;
112 s->duration = (int64_t)c->fcount * MPC_FRAMESIZE * AV_TIME_BASE / st->codec->sample_rate;
113
114 return 0;
115}
116
117static int mpc_read_packet(AVFormatContext *s, AVPacket *pkt)
118{
119 MPCContext *c = s->priv_data;
120 int ret, size, size2, curbits, cur = c->curframe;
121 int64_t tmp, pos;
122
d1886912 123 if (c->curframe >= c->fcount)
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124 return -1;
125
126 if(c->curframe != c->lastframe + 1){
899681cd 127 url_fseek(s->pb, c->frames[c->curframe].pos, SEEK_SET);
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128 c->curbits = c->frames[c->curframe].skip;
129 }
130 c->lastframe = c->curframe;
131 c->curframe++;
132 curbits = c->curbits;
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133 pos = url_ftell(s->pb);
134 tmp = get_le32(s->pb);
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135 if(curbits <= 12){
136 size2 = (tmp >> (12 - curbits)) & 0xFFFFF;
137 }else{
899681cd 138 tmp = (tmp << 32) | get_le32(s->pb);
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139 size2 = (tmp >> (44 - curbits)) & 0xFFFFF;
140 }
141 curbits += 20;
899681cd 142 url_fseek(s->pb, pos, SEEK_SET);
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143
144 size = ((size2 + curbits + 31) & ~31) >> 3;
145 if(cur == c->frames_noted){
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)
6f3e0b21 155 return AVERROR(EIO);
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156
157 pkt->data[0] = curbits;
158 pkt->data[1] = (c->curframe > c->fcount);
159
160 pkt->stream_index = 0;
aac88b53 161 pkt->pts = cur;
899681cd 162 ret = get_buffer(s->pb, pkt->data + 4, size);
185c7b6b 163 if(c->curbits)
899681cd 164 url_fseek(s->pb, -4, SEEK_CUR);
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165 if(ret < size){
166 av_free_packet(pkt);
6f3e0b21 167 return AVERROR(EIO);
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168 }
169 pkt->size = ret + 4;
170
171 return 0;
172}
173
174static int mpc_read_close(AVFormatContext *s)
175{
176 MPCContext *c = s->priv_data;
177
178 av_freep(&c->frames);
179 return 0;
180}
181
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182/**
183 * Seek to the given position
184 * If position is unknown but is within the limits of file
185 * then packets are skipped unless desired position is reached
186 *
187 * Also this function makes use of the fact that timestamp == frameno
188 */
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189static int mpc_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
190{
191 AVStream *st = s->streams[stream_index];
192 MPCContext *c = s->priv_data;
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193 AVPacket pkt1, *pkt = &pkt1;
194 int ret;
aac88b53 195 int index = av_index_search_timestamp(st, timestamp - DELAY_FRAMES, flags);
e3113632 196 uint32_t lastframe;
185c7b6b 197
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198 /* if found, seek there */
199 if (index >= 0){
200 c->curframe = st->index_entries[index].pos;
201 return 0;
202 }
203 /* if timestamp is out of bounds, return error */
204 if(timestamp < 0 || timestamp >= c->fcount)
205 return -1;
aac88b53 206 timestamp -= DELAY_FRAMES;
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207 /* seek to the furthest known position and read packets until
208 we reach desired position */
209 lastframe = c->curframe;
210 if(c->frames_noted) c->curframe = c->frames_noted - 1;
211 while(c->curframe < timestamp){
212 ret = av_read_frame(s, pkt);
213 if (ret < 0){
214 c->curframe = lastframe;
215 return -1;
216 }
217 av_free_packet(pkt);
218 }
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219 return 0;
220}
221
222
223AVInputFormat mpc_demuxer = {
224 "mpc",
bde15e74 225 NULL_IF_CONFIG_SMALL("Musepack"),
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226 sizeof(MPCContext),
227 mpc_probe,
228 mpc_read_header,
229 mpc_read_packet,
230 mpc_read_close,
231 mpc_read_seek,
232 .extensions = "mpc",
233};