Imported Debian version 2.5.2~trusty
[deb_ffmpeg.git] / ffmpeg / libavformat / mpc.c
... / ...
CommitLineData
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
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "libavutil/channel_layout.h"
23#include "libavcodec/get_bits.h"
24#include "avformat.h"
25#include "internal.h"
26#include "apetag.h"
27#include "id3v1.h"
28#include "libavutil/dict.h"
29
30#define MPC_FRAMESIZE 1152
31#define DELAY_FRAMES 32
32
33static const int mpc_rate[4] = { 44100, 48000, 37800, 32000 };
34typedef struct {
35 int64_t pos;
36 int size, skip;
37}MPCFrame;
38
39typedef struct {
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;
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)
57{
58 MPCContext *c = s->priv_data;
59 AVStream *st;
60
61 if(avio_rl24(s->pb) != MKTAG('M', 'P', '+', 0)){
62 av_log(s, AV_LOG_ERROR, "Not a Musepack file\n");
63 return AVERROR_INVALIDDATA;
64 }
65 c->ver = avio_r8(s->pb);
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);
68 return AVERROR_INVALIDDATA;
69 }
70 c->fcount = avio_rl32(s->pb);
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");
73 return AVERROR_INVALIDDATA;
74 }
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 }
84 c->curframe = 0;
85 c->lastframe = -1;
86 c->curbits = 8;
87 c->frames_noted = 0;
88
89 st = avformat_new_stream(s, NULL);
90 if (!st)
91 return AVERROR(ENOMEM);
92 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
93 st->codec->codec_id = AV_CODEC_ID_MUSEPACK7;
94 st->codec->channels = 2;
95 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
96 st->codec->bits_per_coded_sample = 16;
97
98 if (ff_get_extradata(st->codec, s->pb, 16) < 0)
99 return AVERROR(ENOMEM);
100 st->codec->sample_rate = mpc_rate[st->codec->extradata[2] & 3];
101 avpriv_set_pts_info(st, 32, MPC_FRAMESIZE, st->codec->sample_rate);
102 /* scan for seekpoints */
103 st->start_time = 0;
104 st->duration = c->fcount;
105
106 /* try to read APE tags */
107 if (s->pb->seekable) {
108 int64_t pos = avio_tell(s->pb);
109 ff_ape_parse_tag(s);
110 if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
111 ff_id3v1_read(s);
112 avio_seek(s->pb, pos, SEEK_SET);
113 }
114
115 return 0;
116}
117
118static int mpc_read_packet(AVFormatContext *s, AVPacket *pkt)
119{
120 MPCContext *c = s->priv_data;
121 int ret, size, size2, curbits, cur = c->curframe;
122 unsigned tmp;
123 int64_t pos;
124
125 if (c->curframe >= c->fcount && c->fcount)
126 return AVERROR_EOF;
127
128 if(c->curframe != c->lastframe + 1){
129 avio_seek(s->pb, c->frames[c->curframe].pos, SEEK_SET);
130 c->curbits = c->frames[c->curframe].skip;
131 }
132 c->lastframe = c->curframe;
133 c->curframe++;
134 curbits = c->curbits;
135 pos = avio_tell(s->pb);
136 tmp = avio_rl32(s->pb);
137 if(curbits <= 12){
138 size2 = (tmp >> (12 - curbits)) & 0xFFFFF;
139 }else{
140 size2 = (tmp << (curbits - 12) | avio_rl32(s->pb) >> (44 - curbits)) & 0xFFFFF;
141 }
142 curbits += 20;
143 avio_seek(s->pb, pos, SEEK_SET);
144
145 size = ((size2 + curbits + 31) & ~31) >> 3;
146 if(cur == c->frames_noted && c->fcount){
147 c->frames[cur].pos = pos;
148 c->frames[cur].size = size;
149 c->frames[cur].skip = curbits - 20;
150 av_add_index_entry(s->streams[0], cur, cur, size, 0, AVINDEX_KEYFRAME);
151 c->frames_noted++;
152 }
153 c->curbits = (curbits + size2) & 0x1F;
154
155 if ((ret = av_new_packet(pkt, size + 4)) < 0)
156 return ret;
157
158 pkt->data[0] = curbits;
159 pkt->data[1] = (c->curframe > c->fcount) && c->fcount;
160 pkt->data[2] = 0;
161 pkt->data[3] = 0;
162
163 pkt->stream_index = 0;
164 pkt->pts = cur;
165 ret = avio_read(s->pb, pkt->data + 4, size);
166 if(c->curbits)
167 avio_seek(s->pb, -4, SEEK_CUR);
168 if(ret < size){
169 av_free_packet(pkt);
170 return ret < 0 ? ret : AVERROR(EIO);
171 }
172 pkt->size = ret + 4;
173
174 return 0;
175}
176
177static int mpc_read_close(AVFormatContext *s)
178{
179 MPCContext *c = s->priv_data;
180
181 av_freep(&c->frames);
182 return 0;
183}
184
185/**
186 * Seek to the given position
187 * If position is unknown but is within the limits of file
188 * then packets are skipped unless desired position is reached
189 *
190 * Also this function makes use of the fact that timestamp == frameno
191 */
192static int mpc_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
193{
194 AVStream *st = s->streams[stream_index];
195 MPCContext *c = s->priv_data;
196 AVPacket pkt1, *pkt = &pkt1;
197 int ret;
198 int index = av_index_search_timestamp(st, FFMAX(timestamp - DELAY_FRAMES, 0), flags);
199 uint32_t lastframe;
200
201 /* if found, seek there */
202 if (index >= 0 && st->index_entries[st->nb_index_entries-1].timestamp >= timestamp - DELAY_FRAMES){
203 c->curframe = st->index_entries[index].pos;
204 return 0;
205 }
206 /* if timestamp is out of bounds, return error */
207 if(timestamp < 0 || timestamp >= c->fcount)
208 return -1;
209 timestamp -= DELAY_FRAMES;
210 /* seek to the furthest known position and read packets until
211 we reach desired position */
212 lastframe = c->curframe;
213 if(c->frames_noted) c->curframe = c->frames_noted - 1;
214 while(c->curframe < timestamp){
215 ret = av_read_frame(s, pkt);
216 if (ret < 0){
217 c->curframe = lastframe;
218 return ret;
219 }
220 av_free_packet(pkt);
221 }
222 return 0;
223}
224
225
226AVInputFormat ff_mpc_demuxer = {
227 .name = "mpc",
228 .long_name = NULL_IF_CONFIG_SMALL("Musepack"),
229 .priv_data_size = sizeof(MPCContext),
230 .read_probe = mpc_probe,
231 .read_header = mpc_read_header,
232 .read_packet = mpc_read_packet,
233 .read_close = mpc_read_close,
234 .read_seek = mpc_read_seek,
235 .extensions = "mpc",
236};