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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 | |
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 | ||
33 | static const int mpc_rate[4] = { 44100, 48000, 37800, 32000 }; | |
34 | typedef struct { | |
35 | int64_t pos; | |
36 | int size, skip; | |
37 | }MPCFrame; | |
38 | ||
39 | typedef 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 | ||
48 | static 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 | ||
56 | static 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 | ||
118 | static 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 | ||
177 | static 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 | */ | |
192 | static 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 | ||
226 | AVInputFormat 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 | }; |