VC1: merge idct8x8, coeff adjustments and put_pixels.
[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"
311f96a8 24#include "apetag.h"
3694ac24 25#include "id3v1.h"
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26
27#define MPC_FRAMESIZE 1152
aac88b53 28#define DELAY_FRAMES 32
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29
30static const int mpc_rate[4] = { 44100, 48000, 37800, 32000 };
31typedef struct {
32 int64_t pos;
33 int size, skip;
34}MPCFrame;
35
36typedef struct {
37 int ver;
38 uint32_t curframe, lastframe;
39 uint32_t fcount;
40 MPCFrame *frames;
41 int curbits;
42 int frames_noted;
43} MPCContext;
44
45static int mpc_probe(AVProbeData *p)
46{
47 const uint8_t *d = p->buf;
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48 if (d[0] == 'M' && d[1] == 'P' && d[2] == '+' && (d[3] == 0x17 || d[3] == 0x7))
49 return AVPROBE_SCORE_MAX;
50 return 0;
51}
52
53static int mpc_read_header(AVFormatContext *s, AVFormatParameters *ap)
54{
55 MPCContext *c = s->priv_data;
56 AVStream *st;
57
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58 if(get_le24(s->pb) != MKTAG('M', 'P', '+', 0)){
59 av_log(s, AV_LOG_ERROR, "Not a Musepack file\n");
60 return -1;
185c7b6b 61 }
899681cd 62 c->ver = get_byte(s->pb);
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63 if(c->ver != 0x07 && c->ver != 0x17){
64 av_log(s, AV_LOG_ERROR, "Can demux Musepack SV7, got version %02X\n", c->ver);
65 return -1;
66 }
899681cd 67 c->fcount = get_le32(s->pb);
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68 if((int64_t)c->fcount * sizeof(MPCFrame) >= UINT_MAX){
69 av_log(s, AV_LOG_ERROR, "Too many frames, seeking is not possible\n");
70 return -1;
71 }
72 c->frames = av_malloc(c->fcount * sizeof(MPCFrame));
73 c->curframe = 0;
74 c->lastframe = -1;
75 c->curbits = 8;
e3113632 76 c->frames_noted = 0;
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77
78 st = av_new_stream(s, 0);
79 if (!st)
769e10f0 80 return AVERROR(ENOMEM);
72415b2a 81 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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82 st->codec->codec_id = CODEC_ID_MUSEPACK7;
83 st->codec->channels = 2;
dd1c8f3e 84 st->codec->bits_per_coded_sample = 16;
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85
86 st->codec->extradata_size = 16;
87 st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE);
899681cd 88 get_buffer(s->pb, st->codec->extradata, 16);
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89 st->codec->sample_rate = mpc_rate[st->codec->extradata[2] & 3];
90 av_set_pts_info(st, 32, MPC_FRAMESIZE, st->codec->sample_rate);
91 /* scan for seekpoints */
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92 st->start_time = 0;
93 st->duration = c->fcount;
185c7b6b 94
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95 /* try to read APE tags */
96 if (!url_is_streamed(s->pb)) {
97 int64_t pos = url_ftell(s->pb);
98 ff_ape_parse_tag(s);
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99 if (!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))
100 ff_id3v1_read(s);
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101 url_fseek(s->pb, pos, SEEK_SET);
102 }
103
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104 return 0;
105}
106
107static int mpc_read_packet(AVFormatContext *s, AVPacket *pkt)
108{
109 MPCContext *c = s->priv_data;
110 int ret, size, size2, curbits, cur = c->curframe;
111 int64_t tmp, pos;
112
d1886912 113 if (c->curframe >= c->fcount)
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114 return -1;
115
116 if(c->curframe != c->lastframe + 1){
899681cd 117 url_fseek(s->pb, c->frames[c->curframe].pos, SEEK_SET);
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118 c->curbits = c->frames[c->curframe].skip;
119 }
120 c->lastframe = c->curframe;
121 c->curframe++;
122 curbits = c->curbits;
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123 pos = url_ftell(s->pb);
124 tmp = get_le32(s->pb);
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125 if(curbits <= 12){
126 size2 = (tmp >> (12 - curbits)) & 0xFFFFF;
127 }else{
899681cd 128 tmp = (tmp << 32) | get_le32(s->pb);
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129 size2 = (tmp >> (44 - curbits)) & 0xFFFFF;
130 }
131 curbits += 20;
899681cd 132 url_fseek(s->pb, pos, SEEK_SET);
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133
134 size = ((size2 + curbits + 31) & ~31) >> 3;
135 if(cur == c->frames_noted){
136 c->frames[cur].pos = pos;
137 c->frames[cur].size = size;
138 c->frames[cur].skip = curbits - 20;
139 av_add_index_entry(s->streams[0], cur, cur, size, 0, AVINDEX_KEYFRAME);
140 c->frames_noted++;
141 }
142 c->curbits = (curbits + size2) & 0x1F;
143
144 if (av_new_packet(pkt, size) < 0)
6f3e0b21 145 return AVERROR(EIO);
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146
147 pkt->data[0] = curbits;
148 pkt->data[1] = (c->curframe > c->fcount);
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149 pkt->data[2] = 0;
150 pkt->data[3] = 0;
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151
152 pkt->stream_index = 0;
aac88b53 153 pkt->pts = cur;
899681cd 154 ret = get_buffer(s->pb, pkt->data + 4, size);
185c7b6b 155 if(c->curbits)
899681cd 156 url_fseek(s->pb, -4, SEEK_CUR);
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157 if(ret < size){
158 av_free_packet(pkt);
6f3e0b21 159 return AVERROR(EIO);
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160 }
161 pkt->size = ret + 4;
162
163 return 0;
164}
165
166static int mpc_read_close(AVFormatContext *s)
167{
168 MPCContext *c = s->priv_data;
169
170 av_freep(&c->frames);
171 return 0;
172}
173
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174/**
175 * Seek to the given position
176 * If position is unknown but is within the limits of file
177 * then packets are skipped unless desired position is reached
178 *
179 * Also this function makes use of the fact that timestamp == frameno
180 */
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181static int mpc_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
182{
183 AVStream *st = s->streams[stream_index];
184 MPCContext *c = s->priv_data;
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185 AVPacket pkt1, *pkt = &pkt1;
186 int ret;
aac88b53 187 int index = av_index_search_timestamp(st, timestamp - DELAY_FRAMES, flags);
e3113632 188 uint32_t lastframe;
185c7b6b 189
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190 /* if found, seek there */
191 if (index >= 0){
192 c->curframe = st->index_entries[index].pos;
193 return 0;
194 }
195 /* if timestamp is out of bounds, return error */
196 if(timestamp < 0 || timestamp >= c->fcount)
197 return -1;
aac88b53 198 timestamp -= DELAY_FRAMES;
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199 /* seek to the furthest known position and read packets until
200 we reach desired position */
201 lastframe = c->curframe;
202 if(c->frames_noted) c->curframe = c->frames_noted - 1;
203 while(c->curframe < timestamp){
204 ret = av_read_frame(s, pkt);
205 if (ret < 0){
206 c->curframe = lastframe;
207 return -1;
208 }
209 av_free_packet(pkt);
210 }
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211 return 0;
212}
213
214
c6610a21 215AVInputFormat ff_mpc_demuxer = {
185c7b6b 216 "mpc",
bde15e74 217 NULL_IF_CONFIG_SMALL("Musepack"),
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218 sizeof(MPCContext),
219 mpc_probe,
220 mpc_read_header,
221 mpc_read_packet,
222 mpc_read_close,
223 mpc_read_seek,
224 .extensions = "mpc",
225};