wv,mpc8: don't return apetag data in packets.
[libav.git] / libavformat / mpc.c
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1/*
2 * Musepack demuxer
3 * Copyright (c) 2006 Konstantin Shishkov
4 *
2912e87a 5 * This file is part of Libav.
185c7b6b 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 18 * License along with Libav; 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"
c3f9ebf7 24#include "internal.h"
311f96a8 25#include "apetag.h"
3694ac24 26#include "id3v1.h"
d2d67e42 27#include "libavutil/dict.h"
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28
29#define MPC_FRAMESIZE 1152
aac88b53 30#define DELAY_FRAMES 32
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31
32static const int mpc_rate[4] = { 44100, 48000, 37800, 32000 };
33typedef struct {
34 int64_t pos;
35 int size, skip;
36}MPCFrame;
37
38typedef 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
47static int mpc_probe(AVProbeData *p)
48{
49 const uint8_t *d = p->buf;
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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
6e9651d1 55static int mpc_read_header(AVFormatContext *s)
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56{
57 MPCContext *c = s->priv_data;
58 AVStream *st;
59
b7effd4e 60 if(avio_rl24(s->pb) != MKTAG('M', 'P', '+', 0)){
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61 av_log(s, AV_LOG_ERROR, "Not a Musepack file\n");
62 return -1;
185c7b6b 63 }
b7effd4e 64 c->ver = avio_r8(s->pb);
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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 }
b7effd4e 69 c->fcount = avio_rl32(s->pb);
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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 }
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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 }
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83 c->curframe = 0;
84 c->lastframe = -1;
85 c->curbits = 8;
e3113632 86 c->frames_noted = 0;
185c7b6b 87
3b3bbdd3 88 st = avformat_new_stream(s, NULL);
185c7b6b 89 if (!st)
769e10f0 90 return AVERROR(ENOMEM);
72415b2a 91 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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92 st->codec->codec_id = CODEC_ID_MUSEPACK7;
93 st->codec->channels = 2;
dd1c8f3e 94 st->codec->bits_per_coded_sample = 16;
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95
96 st->codec->extradata_size = 16;
97 st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE);
b7effd4e 98 avio_read(s->pb, st->codec->extradata, 16);
185c7b6b 99 st->codec->sample_rate = mpc_rate[st->codec->extradata[2] & 3];
c3f9ebf7 100 avpriv_set_pts_info(st, 32, MPC_FRAMESIZE, st->codec->sample_rate);
185c7b6b 101 /* scan for seekpoints */
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102 st->start_time = 0;
103 st->duration = c->fcount;
185c7b6b 104
311f96a8 105 /* try to read APE tags */
8978feda 106 if (s->pb->seekable) {
a2704c97 107 int64_t pos = avio_tell(s->pb);
311f96a8 108 ff_ape_parse_tag(s);
d2d67e42 109 if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
3694ac24 110 ff_id3v1_read(s);
6b4aa5da 111 avio_seek(s->pb, pos, SEEK_SET);
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112 }
113
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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;
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121 unsigned tmp;
122 int64_t pos;
185c7b6b 123
0cdd1208 124 if (c->curframe >= c->fcount && c->fcount)
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125 return -1;
126
127 if(c->curframe != c->lastframe + 1){
6b4aa5da 128 avio_seek(s->pb, c->frames[c->curframe].pos, SEEK_SET);
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129 c->curbits = c->frames[c->curframe].skip;
130 }
131 c->lastframe = c->curframe;
132 c->curframe++;
133 curbits = c->curbits;
a2704c97 134 pos = avio_tell(s->pb);
b7effd4e 135 tmp = avio_rl32(s->pb);
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136 if(curbits <= 12){
137 size2 = (tmp >> (12 - curbits)) & 0xFFFFF;
138 }else{
d9ba767d 139 size2 = (tmp << (curbits - 12) | avio_rl32(s->pb) >> (44 - curbits)) & 0xFFFFF;
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140 }
141 curbits += 20;
6b4aa5da 142 avio_seek(s->pb, pos, SEEK_SET);
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143
144 size = ((size2 + curbits + 31) & ~31) >> 3;
0cdd1208 145 if(cur == c->frames_noted && c->fcount){
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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;
0cdd1208 158 pkt->data[1] = (c->curframe > c->fcount) && c->fcount;
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159 pkt->data[2] = 0;
160 pkt->data[3] = 0;
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161
162 pkt->stream_index = 0;
aac88b53 163 pkt->pts = cur;
b7effd4e 164 ret = avio_read(s->pb, pkt->data + 4, size);
185c7b6b 165 if(c->curbits)
6b4aa5da 166 avio_seek(s->pb, -4, SEEK_CUR);
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167 if(ret < size){
168 av_free_packet(pkt);
6f3e0b21 169 return AVERROR(EIO);
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170 }
171 pkt->size = ret + 4;
172
173 return 0;
174}
175
176static int mpc_read_close(AVFormatContext *s)
177{
178 MPCContext *c = s->priv_data;
179
180 av_freep(&c->frames);
181 return 0;
182}
183
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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 */
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191static 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;
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195 AVPacket pkt1, *pkt = &pkt1;
196 int ret;
aac88b53 197 int index = av_index_search_timestamp(st, timestamp - DELAY_FRAMES, flags);
e3113632 198 uint32_t lastframe;
185c7b6b 199
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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;
aac88b53 208 timestamp -= DELAY_FRAMES;
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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 }
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221 return 0;
222}
223
224
c6610a21 225AVInputFormat ff_mpc_demuxer = {
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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,
20234a4b 234 .extensions = "mpc",
185c7b6b 235};