lavc: Consistently prefix input buffer defines
[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
f6c6e5aa 22#include "libavutil/channel_layout.h"
9106a698 23#include "libavcodec/get_bits.h"
185c7b6b 24#include "avformat.h"
c3f9ebf7 25#include "internal.h"
311f96a8 26#include "apetag.h"
3694ac24 27#include "id3v1.h"
d2d67e42 28#include "libavutil/dict.h"
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29
30#define MPC_FRAMESIZE 1152
aac88b53 31#define DELAY_FRAMES 32
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32
33static const int mpc_rate[4] = { 44100, 48000, 37800, 32000 };
daf8cf35 34typedef struct MPCFrame {
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35 int64_t pos;
36 int size, skip;
37}MPCFrame;
38
daf8cf35 39typedef struct MPCContext {
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40 int ver;
41 uint32_t curframe, lastframe;
42 uint32_t fcount;
43 MPCFrame *frames;
44 int curbits;
45 int frames_noted;
46} MPCContext;
47
48static int mpc_probe(AVProbeData *p)
49{
50 const uint8_t *d = p->buf;
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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
6e9651d1 56static int mpc_read_header(AVFormatContext *s)
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57{
58 MPCContext *c = s->priv_data;
59 AVStream *st;
60
b7effd4e 61 if(avio_rl24(s->pb) != MKTAG('M', 'P', '+', 0)){
6612d8cf 62 av_log(s, AV_LOG_ERROR, "Not a Musepack file\n");
263dbe9d 63 return AVERROR_INVALIDDATA;
185c7b6b 64 }
b7effd4e 65 c->ver = avio_r8(s->pb);
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66 if(c->ver != 0x07 && c->ver != 0x17){
67 av_log(s, AV_LOG_ERROR, "Can demux Musepack SV7, got version %02X\n", c->ver);
263dbe9d 68 return AVERROR_INVALIDDATA;
185c7b6b 69 }
b7effd4e 70 c->fcount = avio_rl32(s->pb);
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71 if((int64_t)c->fcount * sizeof(MPCFrame) >= UINT_MAX){
72 av_log(s, AV_LOG_ERROR, "Too many frames, seeking is not possible\n");
263dbe9d 73 return AVERROR_INVALIDDATA;
185c7b6b 74 }
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75 if(c->fcount){
76 c->frames = av_malloc(c->fcount * sizeof(MPCFrame));
77 if(!c->frames){
78 av_log(s, AV_LOG_ERROR, "Cannot allocate seektable\n");
79 return AVERROR(ENOMEM);
80 }
81 }else{
82 av_log(s, AV_LOG_WARNING, "Container reports no frames\n");
83 }
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84 c->curframe = 0;
85 c->lastframe = -1;
86 c->curbits = 8;
e3113632 87 c->frames_noted = 0;
185c7b6b 88
3b3bbdd3 89 st = avformat_new_stream(s, NULL);
185c7b6b 90 if (!st)
769e10f0 91 return AVERROR(ENOMEM);
72415b2a 92 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
36ef5369 93 st->codec->codec_id = AV_CODEC_ID_MUSEPACK7;
185c7b6b 94 st->codec->channels = 2;
f6c6e5aa 95 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
dd1c8f3e 96 st->codec->bits_per_coded_sample = 16;
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97
98 st->codec->extradata_size = 16;
059a9348 99 st->codec->extradata = av_mallocz(st->codec->extradata_size+AV_INPUT_BUFFER_PADDING_SIZE);
b7effd4e 100 avio_read(s->pb, st->codec->extradata, 16);
185c7b6b 101 st->codec->sample_rate = mpc_rate[st->codec->extradata[2] & 3];
c3f9ebf7 102 avpriv_set_pts_info(st, 32, MPC_FRAMESIZE, st->codec->sample_rate);
185c7b6b 103 /* scan for seekpoints */
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104 st->start_time = 0;
105 st->duration = c->fcount;
185c7b6b 106
311f96a8 107 /* try to read APE tags */
8978feda 108 if (s->pb->seekable) {
a2704c97 109 int64_t pos = avio_tell(s->pb);
311f96a8 110 ff_ape_parse_tag(s);
d2d67e42 111 if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
3694ac24 112 ff_id3v1_read(s);
6b4aa5da 113 avio_seek(s->pb, pos, SEEK_SET);
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114 }
115
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116 return 0;
117}
118
119static int mpc_read_packet(AVFormatContext *s, AVPacket *pkt)
120{
121 MPCContext *c = s->priv_data;
122 int ret, size, size2, curbits, cur = c->curframe;
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123 unsigned tmp;
124 int64_t pos;
185c7b6b 125
0cdd1208 126 if (c->curframe >= c->fcount && c->fcount)
263dbe9d 127 return AVERROR_EOF;
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128
129 if(c->curframe != c->lastframe + 1){
6b4aa5da 130 avio_seek(s->pb, c->frames[c->curframe].pos, SEEK_SET);
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131 c->curbits = c->frames[c->curframe].skip;
132 }
133 c->lastframe = c->curframe;
134 c->curframe++;
135 curbits = c->curbits;
a2704c97 136 pos = avio_tell(s->pb);
b7effd4e 137 tmp = avio_rl32(s->pb);
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138 if(curbits <= 12){
139 size2 = (tmp >> (12 - curbits)) & 0xFFFFF;
140 }else{
d9ba767d 141 size2 = (tmp << (curbits - 12) | avio_rl32(s->pb) >> (44 - curbits)) & 0xFFFFF;
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142 }
143 curbits += 20;
6b4aa5da 144 avio_seek(s->pb, pos, SEEK_SET);
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145
146 size = ((size2 + curbits + 31) & ~31) >> 3;
0cdd1208 147 if(cur == c->frames_noted && c->fcount){
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148 c->frames[cur].pos = pos;
149 c->frames[cur].size = size;
150 c->frames[cur].skip = curbits - 20;
151 av_add_index_entry(s->streams[0], cur, cur, size, 0, AVINDEX_KEYFRAME);
152 c->frames_noted++;
153 }
154 c->curbits = (curbits + size2) & 0x1F;
155
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156 if ((ret = av_new_packet(pkt, size)) < 0)
157 return ret;
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158
159 pkt->data[0] = curbits;
0cdd1208 160 pkt->data[1] = (c->curframe > c->fcount) && c->fcount;
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161 pkt->data[2] = 0;
162 pkt->data[3] = 0;
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163
164 pkt->stream_index = 0;
aac88b53 165 pkt->pts = cur;
b7effd4e 166 ret = avio_read(s->pb, pkt->data + 4, size);
185c7b6b 167 if(c->curbits)
6b4aa5da 168 avio_seek(s->pb, -4, SEEK_CUR);
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169 if(ret < size){
170 av_free_packet(pkt);
263dbe9d 171 return ret < 0 ? ret : AVERROR(EIO);
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172 }
173 pkt->size = ret + 4;
174
175 return 0;
176}
177
178static int mpc_read_close(AVFormatContext *s)
179{
180 MPCContext *c = s->priv_data;
181
182 av_freep(&c->frames);
183 return 0;
184}
185
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186/**
187 * Seek to the given position
188 * If position is unknown but is within the limits of file
189 * then packets are skipped unless desired position is reached
190 *
191 * Also this function makes use of the fact that timestamp == frameno
192 */
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193static int mpc_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
194{
195 AVStream *st = s->streams[stream_index];
196 MPCContext *c = s->priv_data;
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197 AVPacket pkt1, *pkt = &pkt1;
198 int ret;
aac88b53 199 int index = av_index_search_timestamp(st, timestamp - DELAY_FRAMES, flags);
e3113632 200 uint32_t lastframe;
185c7b6b 201
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202 /* if found, seek there */
203 if (index >= 0){
204 c->curframe = st->index_entries[index].pos;
205 return 0;
206 }
207 /* if timestamp is out of bounds, return error */
208 if(timestamp < 0 || timestamp >= c->fcount)
209 return -1;
aac88b53 210 timestamp -= DELAY_FRAMES;
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211 /* seek to the furthest known position and read packets until
212 we reach desired position */
213 lastframe = c->curframe;
214 if(c->frames_noted) c->curframe = c->frames_noted - 1;
215 while(c->curframe < timestamp){
216 ret = av_read_frame(s, pkt);
217 if (ret < 0){
218 c->curframe = lastframe;
263dbe9d 219 return ret;
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220 }
221 av_free_packet(pkt);
222 }
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223 return 0;
224}
225
226
c6610a21 227AVInputFormat ff_mpc_demuxer = {
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228 .name = "mpc",
229 .long_name = NULL_IF_CONFIG_SMALL("Musepack"),
230 .priv_data_size = sizeof(MPCContext),
231 .read_probe = mpc_probe,
232 .read_header = mpc_read_header,
233 .read_packet = mpc_read_packet,
234 .read_close = mpc_read_close,
235 .read_seek = mpc_read_seek,
20234a4b 236 .extensions = "mpc",
185c7b6b 237};