FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/mpc.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 74 111 66.7%
Functions: 3 4 75.0%
Branches: 30 68 44.1%
Line Branch Exec Source
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 "libavutil/mem.h"
24
25 #include "avformat.h"
26 #include "demux.h"
27 #include "internal.h"
28 #include "apetag.h"
29 #include "id3v1.h"
30 #include "libavutil/dict.h"
31
32 #define MPC_FRAMESIZE 1152
33 #define DELAY_FRAMES 32
34
35 static const int mpc_rate[4] = { 44100, 48000, 37800, 32000 };
36 typedef struct MPCFrame {
37 int64_t pos;
38 int size, skip;
39 }MPCFrame;
40
41 typedef struct MPCContext {
42 int ver;
43 uint32_t curframe, lastframe;
44 uint32_t fcount;
45 MPCFrame *frames;
46 int curbits;
47 int frames_noted;
48 } MPCContext;
49
50 7186 static int mpc_probe(const AVProbeData *p)
51 {
52 7186 const uint8_t *d = p->buf;
53
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 7186 if (d[0] == 'M' && d[1] == 'P' && d[2] == '+' && (d[3] == 0x17 || d[3] == 0x7))
54 2 return AVPROBE_SCORE_MAX;
55 7184 return 0;
56 }
57
58 2 static int mpc_read_header(AVFormatContext *s)
59 {
60 2 MPCContext *c = s->priv_data;
61 AVStream *st;
62 int ret;
63
64
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 2 if(avio_rl24(s->pb) != MKTAG('M', 'P', '+', 0)){
65 ✗ av_log(s, AV_LOG_ERROR, "Not a Musepack file\n");
66 ✗ return AVERROR_INVALIDDATA;
67 }
68 2 c->ver = avio_r8(s->pb);
69
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 2 if(c->ver != 0x07 && c->ver != 0x17){
70 ✗ av_log(s, AV_LOG_ERROR, "Can demux Musepack SV7, got version %02X\n", c->ver);
71 ✗ return AVERROR_INVALIDDATA;
72 }
73 2 c->fcount = avio_rl32(s->pb);
74
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 2 if((int64_t)c->fcount * sizeof(MPCFrame) >= UINT_MAX){
75 ✗ av_log(s, AV_LOG_ERROR, "Too many frames, seeking is not possible\n");
76 ✗ return AVERROR_INVALIDDATA;
77 }
78 2 c->curframe = 0;
79 2 c->lastframe = -1;
80 2 c->curbits = 8;
81 2 c->frames_noted = 0;
82
83 2 st = avformat_new_stream(s, NULL);
84
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 2 if (!st)
85 ✗ return AVERROR(ENOMEM);
86
87
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 2 if (c->fcount) {
88 2 c->frames = av_malloc(c->fcount * sizeof(MPCFrame));
89
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 2 if (!c->frames) {
90 ✗ av_log(s, AV_LOG_ERROR, "Cannot allocate seektable\n");
91 ✗ return AVERROR(ENOMEM);
92 }
93 2 st->priv_data = c->frames;
94 } else {
95 ✗ av_log(s, AV_LOG_WARNING, "Container reports no frames\n");
96 }
97
98 2 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
99 2 st->codecpar->codec_id = AV_CODEC_ID_MUSEPACK7;
100 2 st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
101 2 st->codecpar->bits_per_coded_sample = 16;
102
103
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 2 if ((ret = ff_get_extradata(s, st->codecpar, s->pb, 16)) < 0)
104 ✗ return ret;
105 2 st->codecpar->sample_rate = mpc_rate[st->codecpar->extradata[2] & 3];
106 2 avpriv_set_pts_info(st, 32, MPC_FRAMESIZE, st->codecpar->sample_rate);
107 /* scan for seekpoints */
108 2 st->start_time = 0;
109 2 st->duration = c->fcount;
110
111 /* try to read APE tags */
112
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 2 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
113 2 int64_t pos = avio_tell(s->pb);
114 2 ff_ape_parse_tag(s);
115
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 2 if (av_dict_count(s->metadata) == 0)
116 ✗ ff_id3v1_read(s);
117 2 avio_seek(s->pb, pos, SEEK_SET);
118 }
119
120 2 return 0;
121 }
122
123 914 static int mpc_read_packet(AVFormatContext *s, AVPacket *pkt)
124 {
125 914 MPCContext *c = s->priv_data;
126 914 int ret, size, size2, curbits, cur = c->curframe;
127 unsigned tmp;
128 int64_t pos;
129
130
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 914 if (c->curframe >= c->fcount && c->fcount)
131 2 return AVERROR_EOF;
132
133
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 912 if(c->curframe != c->lastframe + 1){
134 ✗ avio_seek(s->pb, c->frames[c->curframe].pos, SEEK_SET);
135 ✗ c->curbits = c->frames[c->curframe].skip;
136 }
137 912 c->lastframe = c->curframe;
138 912 c->curframe++;
139 912 curbits = c->curbits;
140 912 pos = avio_tell(s->pb);
141 912 tmp = avio_rl32(s->pb);
142
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 912 if(curbits <= 12){
143 368 size2 = (tmp >> (12 - curbits)) & 0xFFFFF;
144 }else{
145 544 size2 = (tmp << (curbits - 12) | avio_rl32(s->pb) >> (44 - curbits)) & 0xFFFFF;
146 }
147 912 curbits += 20;
148 912 avio_seek(s->pb, pos, SEEK_SET);
149
150 912 size = ((size2 + curbits + 31) & ~31) >> 3;
151
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 912 if(cur == c->frames_noted && c->fcount){
152 912 c->frames[cur].pos = pos;
153 912 c->frames[cur].size = size;
154 912 c->frames[cur].skip = curbits - 20;
155 912 av_add_index_entry(s->streams[0], cur, cur, size, 0, AVINDEX_KEYFRAME);
156 912 c->frames_noted++;
157 }
158 912 c->curbits = (curbits + size2) & 0x1F;
159
160
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 912 if ((ret = av_new_packet(pkt, size + 4)) < 0)
161 ✗ return ret;
162
163 912 pkt->data[0] = curbits;
164
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 912 pkt->data[1] = (c->curframe > c->fcount) && c->fcount;
165 912 pkt->data[2] = 0;
166 912 pkt->data[3] = 0;
167
168 912 pkt->stream_index = 0;
169 912 pkt->pts = cur;
170 912 ret = avio_read(s->pb, pkt->data + 4, size);
171
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 912 if(c->curbits)
172 888 avio_seek(s->pb, -4, SEEK_CUR);
173
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 912 if(ret < size){
174 ✗ return ret < 0 ? ret : AVERROR(EIO);
175 }
176 912 pkt->size = ret + 4;
177
178 912 return 0;
179 }
180
181 /**
182 * Seek to the given position
183 * If position is unknown but is within the limits of file
184 * then packets are skipped unless desired position is reached
185 *
186 * Also this function makes use of the fact that timestamp == frameno
187 */
188 ✗ static int mpc_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
189 {
190 ✗ AVStream *st = s->streams[stream_index];
191 ✗ FFStream *const sti = ffstream(st);
192 ✗ MPCContext *c = s->priv_data;
193 ✗ AVPacket pkt1, *pkt = &pkt1;
194 int ret;
195 ✗ int index = av_index_search_timestamp(st, FFMAX(timestamp - DELAY_FRAMES, 0), flags);
196 uint32_t lastframe;
197
198 /* if found, seek there */
199 ✗ if (index >= 0 && sti->index_entries[sti->nb_index_entries-1].timestamp >= timestamp - DELAY_FRAMES) {
200 ✗ c->curframe = sti->index_entries[index].pos;
201 ✗ return 0;
202 }
203 /* if timestamp is out of bounds, return error */
204 ✗ if(timestamp < 0 || timestamp >= c->fcount)
205 ✗ return -1;
206 ✗ timestamp -= DELAY_FRAMES;
207 /* seek to the furthest known position and read packets until
208 we reach desired position */
209 ✗ lastframe = c->curframe;
210 ✗ if(c->frames_noted) c->curframe = c->frames_noted - 1;
211 ✗ while(c->curframe < timestamp){
212 ✗ ret = av_read_frame(s, pkt);
213 ✗ if (ret < 0){
214 ✗ c->curframe = lastframe;
215 ✗ return ret;
216 }
217 ✗ av_packet_unref(pkt);
218 }
219 ✗ return 0;
220 }
221
222
223 const FFInputFormat ff_mpc_demuxer = {
224 .p.name = "mpc",
225 .p.long_name = NULL_IF_CONFIG_SMALL("Musepack"),
226 .p.extensions = "mpc",
227 .priv_data_size = sizeof(MPCContext),
228 .read_probe = mpc_probe,
229 .read_header = mpc_read_header,
230 .read_packet = mpc_read_packet,
231 .read_seek = mpc_read_seek,
232 };
233