FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/vqf.c
Date: 2024-02-16 17:37:06
Exec Total Coverage
Lines: 84 145 57.9%
Functions: 4 5 80.0%
Branches: 26 61 42.6%

Line Branch Exec Source
1 /*
2 * VQF demuxer
3 * Copyright (c) 2009 Vitor Sessak
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 "avformat.h"
23 #include "internal.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/dict.h"
26 #include "libavutil/mathematics.h"
27 #include "riff.h"
28
29 typedef struct VqfContext {
30 int frame_bit_len;
31 uint8_t last_frame_bits;
32 int remaining_bits;
33 } VqfContext;
34
35 7023 static int vqf_probe(const AVProbeData *probe_packet)
36 {
37
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7023 if (AV_RL32(probe_packet->buf) != MKTAG('T','W','I','N'))
38 7021 return 0;
39
40
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2 if (!memcmp(probe_packet->buf + 4, "97012000", 8))
41 2 return AVPROBE_SCORE_MAX;
42
43 if (!memcmp(probe_packet->buf + 4, "00052200", 8))
44 return AVPROBE_SCORE_MAX;
45
46 if (AV_RL32(probe_packet->buf + 12) > (1<<27))
47 return AVPROBE_SCORE_EXTENSION/2;
48
49 return AVPROBE_SCORE_EXTENSION;
50 }
51
52 10 static void add_metadata(AVFormatContext *s, uint32_t tag,
53 unsigned int tag_len, unsigned int remaining)
54 {
55 10 int len = FFMIN(tag_len, remaining);
56 10 char *buf, key[5] = {0};
57
58
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10 if (len == UINT_MAX)
59 return;
60
61 10 buf = av_malloc(len+1);
62
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10 if (!buf)
63 return;
64 10 avio_read(s->pb, buf, len);
65 10 buf[len] = 0;
66 10 AV_WL32(key, tag);
67 10 av_dict_set(&s->metadata, key, buf, AV_DICT_DONT_STRDUP_VAL);
68 }
69
70 static const AVMetadataConv vqf_metadata_conv[] = {
71 { "(c) ", "copyright" },
72 { "ARNG", "arranger" },
73 { "AUTH", "author" },
74 { "BAND", "band" },
75 { "CDCT", "conductor" },
76 { "COMT", "comment" },
77 { "FILE", "filename" },
78 { "GENR", "genre" },
79 { "LABL", "publisher" },
80 { "MUSC", "composer" },
81 { "NAME", "title" },
82 { "NOTE", "note" },
83 { "PROD", "producer" },
84 { "PRSN", "personnel" },
85 { "REMX", "remixer" },
86 { "SING", "singer" },
87 { "TRCK", "track" },
88 { "WORD", "words" },
89 { 0 },
90 };
91
92 2 static int vqf_read_header(AVFormatContext *s)
93 {
94 2 VqfContext *c = s->priv_data;
95 2 AVStream *st = avformat_new_stream(s, NULL);
96 int chunk_tag;
97 2 int rate_flag = -1;
98 int header_size;
99 2 int read_bitrate = 0;
100 int size, ret;
101 uint8_t comm_chunk[12];
102
103
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2 if (!st)
104 return AVERROR(ENOMEM);
105
106 2 avio_skip(s->pb, 12);
107
108 2 header_size = avio_rb32(s->pb);
109
110
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2 if (header_size < 0)
111 return AVERROR_INVALIDDATA;
112
113 2 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
114 2 st->codecpar->codec_id = AV_CODEC_ID_TWINVQ;
115 2 st->start_time = 0;
116
117 do {
118 int len;
119 16 chunk_tag = avio_rl32(s->pb);
120
121
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16 if (chunk_tag == MKTAG('D','A','T','A'))
122 2 break;
123
124 14 len = avio_rb32(s->pb);
125
126
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14 if ((unsigned) len > INT_MAX/2 || header_size < 8) {
127 av_log(s, AV_LOG_ERROR, "Malformed header\n");
128 return -1;
129 }
130
131 14 header_size -= 8;
132
133
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14 switch(chunk_tag){
134 2 case MKTAG('C','O','M','M'):
135
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2 if (len < 12)
136 return AVERROR_INVALIDDATA;
137
138 2 avio_read(s->pb, comm_chunk, 12);
139 2 st->codecpar->ch_layout.nb_channels = AV_RB32(comm_chunk) + 1;
140 2 read_bitrate = AV_RB32(comm_chunk + 4);
141 2 rate_flag = AV_RB32(comm_chunk + 8);
142 2 avio_skip(s->pb, len-12);
143
144
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2 if (st->codecpar->ch_layout.nb_channels <= 0) {
145 av_log(s, AV_LOG_ERROR, "Invalid number of channels\n");
146 return AVERROR_INVALIDDATA;
147 }
148
149 2 st->codecpar->bit_rate = (int64_t)read_bitrate * 1000;
150 2 break;
151 2 case MKTAG('D','S','I','Z'): // size of compressed data
152 {
153 2 av_dict_set_int(&s->metadata, "size", avio_rb32(s->pb), 0);
154 }
155 2 break;
156 case MKTAG('Y','E','A','R'): // recording date
157 case MKTAG('E','N','C','D'): // compression date
158 case MKTAG('E','X','T','R'): // reserved
159 case MKTAG('_','Y','M','H'): // reserved
160 case MKTAG('_','N','T','T'): // reserved
161 case MKTAG('_','I','D','3'): // reserved for ID3 tags
162 avio_skip(s->pb, FFMIN(len, header_size));
163 break;
164 10 default:
165 10 add_metadata(s, chunk_tag, len, header_size);
166 10 break;
167 }
168
169 14 header_size -= len;
170
171
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14 } while (header_size >= 0 && !avio_feof(s->pb));
172
173
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2 switch (rate_flag) {
174 case -1:
175 av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
176 return -1;
177 case 44:
178 st->codecpar->sample_rate = 44100;
179 break;
180 2 case 22:
181 2 st->codecpar->sample_rate = 22050;
182 2 break;
183 case 11:
184 st->codecpar->sample_rate = 11025;
185 break;
186 default:
187 if (rate_flag < 8 || rate_flag > 44) {
188 av_log(s, AV_LOG_ERROR, "Invalid rate flag %d\n", rate_flag);
189 return AVERROR_INVALIDDATA;
190 }
191 st->codecpar->sample_rate = rate_flag*1000;
192 break;
193 }
194
195
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2 if (read_bitrate / st->codecpar->ch_layout.nb_channels < 8 ||
196
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2 read_bitrate / st->codecpar->ch_layout.nb_channels > 48) {
197 av_log(s, AV_LOG_ERROR, "Invalid bitrate per channel %d\n",
198 read_bitrate / st->codecpar->ch_layout.nb_channels);
199 return AVERROR_INVALIDDATA;
200 }
201
202 2 switch (((st->codecpar->sample_rate/1000) << 8) +
203
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2 read_bitrate/st->codecpar->ch_layout.nb_channels) {
204 case (11<<8) + 8 :
205 case (8 <<8) + 8 :
206 case (11<<8) + 10:
207 case (22<<8) + 32:
208 size = 512;
209 break;
210 2 case (16<<8) + 16:
211 case (22<<8) + 20:
212 case (22<<8) + 24:
213 2 size = 1024;
214 2 break;
215 case (44<<8) + 40:
216 case (44<<8) + 48:
217 size = 2048;
218 break;
219 default:
220 av_log(s, AV_LOG_ERROR, "Mode not supported: %d Hz, %"PRId64" kb/s.\n",
221 st->codecpar->sample_rate, st->codecpar->bit_rate);
222 return -1;
223 }
224 2 c->frame_bit_len = st->codecpar->bit_rate*size/st->codecpar->sample_rate;
225 2 avpriv_set_pts_info(st, 64, size, st->codecpar->sample_rate);
226
227 /* put first 12 bytes of COMM chunk in extradata */
228
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2 if ((ret = ff_alloc_extradata(st->codecpar, 12)) < 0)
229 return ret;
230 2 memcpy(st->codecpar->extradata, comm_chunk, 12);
231
232 2 ff_metadata_conv_ctx(s, NULL, vqf_metadata_conv);
233
234 2 return 0;
235 }
236
237 5178 static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
238 {
239 5178 VqfContext *c = s->priv_data;
240 int ret;
241 5178 int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
242
243
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5178 if ((ret = av_new_packet(pkt, size + 2)) < 0)
244 return ret;
245
246 5178 pkt->pos = avio_tell(s->pb);
247 5178 pkt->stream_index = 0;
248 5178 pkt->duration = 1;
249
250 5178 pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
251 5178 pkt->data[1] = c->last_frame_bits;
252 5178 ret = avio_read(s->pb, pkt->data+2, size);
253
254
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5178 if (ret != size) {
255 2 return AVERROR(EIO);
256 }
257
258 5176 c->last_frame_bits = pkt->data[size+1];
259 5176 c->remaining_bits = (size << 3) - c->frame_bit_len + c->remaining_bits;
260
261 5176 return size+2;
262 }
263
264 static int vqf_read_seek(AVFormatContext *s,
265 int stream_index, int64_t timestamp, int flags)
266 {
267 VqfContext *c = s->priv_data;
268 AVStream *st;
269 int64_t ret;
270 int64_t pos;
271
272 st = s->streams[stream_index];
273 pos = av_rescale_rnd(timestamp * st->codecpar->bit_rate,
274 st->time_base.num,
275 st->time_base.den * (int64_t)c->frame_bit_len,
276 (flags & AVSEEK_FLAG_BACKWARD) ?
277 AV_ROUND_DOWN : AV_ROUND_UP);
278 pos *= c->frame_bit_len;
279
280 ffstream(st)->cur_dts = av_rescale(pos, st->time_base.den,
281 st->codecpar->bit_rate * (int64_t)st->time_base.num);
282
283 if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + ffformatcontext(s)->data_offset, SEEK_SET)) < 0)
284 return ret;
285
286 c->remaining_bits = -7 - ((pos-7)&7);
287 return 0;
288 }
289
290 const AVInputFormat ff_vqf_demuxer = {
291 .name = "vqf",
292 .long_name = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
293 .priv_data_size = sizeof(VqfContext),
294 .read_probe = vqf_probe,
295 .read_header = vqf_read_header,
296 .read_packet = vqf_read_packet,
297 .read_seek = vqf_read_seek,
298 .extensions = "vqf,vql,vqe",
299 };
300