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path: root/libavformat/takdec.c (plain)
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1/*
2 * Raw TAK demuxer
3 * Copyright (c) 2012 Paul B Mahol
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/crc.h"
23
24#define BITSTREAM_READER_LE
25#include "libavcodec/tak.h"
26
27#include "apetag.h"
28#include "avformat.h"
29#include "avio_internal.h"
30#include "internal.h"
31#include "rawdec.h"
32
33typedef struct TAKDemuxContext {
34 int mlast_frame;
35 int64_t data_end;
36} TAKDemuxContext;
37
38static int tak_probe(AVProbeData *p)
39{
40 if (!memcmp(p->buf, "tBaK", 4))
41 return AVPROBE_SCORE_EXTENSION;
42 return 0;
43}
44
45static unsigned long tak_check_crc(unsigned long checksum, const uint8_t *buf,
46 unsigned int len)
47{
48 return av_crc(av_crc_get_table(AV_CRC_24_IEEE), checksum, buf, len);
49}
50
51static int tak_read_header(AVFormatContext *s)
52{
53 TAKDemuxContext *tc = s->priv_data;
54 AVIOContext *pb = s->pb;
55 GetBitContext gb;
56 AVStream *st;
57 uint8_t *buffer = NULL;
58 int ret;
59
60 st = avformat_new_stream(s, 0);
61 if (!st)
62 return AVERROR(ENOMEM);
63
64 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
65 st->codecpar->codec_id = AV_CODEC_ID_TAK;
66 st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
67
68 tc->mlast_frame = 0;
69 if (avio_rl32(pb) != MKTAG('t', 'B', 'a', 'K')) {
70 avio_seek(pb, -4, SEEK_CUR);
71 return 0;
72 }
73
74 while (!avio_feof(pb)) {
75 enum TAKMetaDataType type;
76 int size;
77
78 type = avio_r8(pb) & 0x7f;
79 size = avio_rl24(pb);
80
81 switch (type) {
82 case TAK_METADATA_STREAMINFO:
83 case TAK_METADATA_LAST_FRAME:
84 case TAK_METADATA_ENCODER:
85 if (size <= 3)
86 return AVERROR_INVALIDDATA;
87
88 buffer = av_malloc(size - 3 + AV_INPUT_BUFFER_PADDING_SIZE);
89 if (!buffer)
90 return AVERROR(ENOMEM);
91 memset(buffer + size - 3, 0, AV_INPUT_BUFFER_PADDING_SIZE);
92
93 ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U);
94 if (avio_read(pb, buffer, size - 3) != size - 3) {
95 av_freep(&buffer);
96 return AVERROR(EIO);
97 }
98 if (ffio_get_checksum(s->pb) != avio_rb24(pb)) {
99 av_log(s, AV_LOG_ERROR, "%d metadata block CRC error.\n", type);
100 if (s->error_recognition & AV_EF_EXPLODE) {
101 av_freep(&buffer);
102 return AVERROR_INVALIDDATA;
103 }
104 }
105
106 init_get_bits8(&gb, buffer, size - 3);
107 break;
108 case TAK_METADATA_MD5: {
109 uint8_t md5[16];
110 int i;
111
112 if (size != 19)
113 return AVERROR_INVALIDDATA;
114 ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U);
115 avio_read(pb, md5, 16);
116 if (ffio_get_checksum(s->pb) != avio_rb24(pb)) {
117 av_log(s, AV_LOG_ERROR, "MD5 metadata block CRC error.\n");
118 if (s->error_recognition & AV_EF_EXPLODE)
119 return AVERROR_INVALIDDATA;
120 }
121
122 av_log(s, AV_LOG_VERBOSE, "MD5=");
123 for (i = 0; i < 16; i++)
124 av_log(s, AV_LOG_VERBOSE, "%02x", md5[i]);
125 av_log(s, AV_LOG_VERBOSE, "\n");
126 break;
127 }
128 case TAK_METADATA_END: {
129 int64_t curpos = avio_tell(pb);
130
131 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
132 ff_ape_parse_tag(s);
133 avio_seek(pb, curpos, SEEK_SET);
134 }
135
136 tc->data_end += curpos;
137 return 0;
138 }
139 default:
140 ret = avio_skip(pb, size);
141 if (ret < 0)
142 return ret;
143 }
144
145 if (type == TAK_METADATA_STREAMINFO) {
146 TAKStreamInfo ti;
147
148 avpriv_tak_parse_streaminfo(&gb, &ti);
149 if (ti.samples > 0)
150 st->duration = ti.samples;
151 st->codecpar->bits_per_coded_sample = ti.bps;
152 if (ti.ch_layout)
153 st->codecpar->channel_layout = ti.ch_layout;
154 st->codecpar->sample_rate = ti.sample_rate;
155 st->codecpar->channels = ti.channels;
156 st->start_time = 0;
157 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
158 st->codecpar->extradata = buffer;
159 st->codecpar->extradata_size = size - 3;
160 buffer = NULL;
161 } else if (type == TAK_METADATA_LAST_FRAME) {
162 if (size != 11)
163 return AVERROR_INVALIDDATA;
164 tc->mlast_frame = 1;
165 tc->data_end = get_bits64(&gb, TAK_LAST_FRAME_POS_BITS) +
166 get_bits(&gb, TAK_LAST_FRAME_SIZE_BITS);
167 av_freep(&buffer);
168 } else if (type == TAK_METADATA_ENCODER) {
169 av_log(s, AV_LOG_VERBOSE, "encoder version: %0X\n",
170 get_bits_long(&gb, TAK_ENCODER_VERSION_BITS));
171 av_freep(&buffer);
172 }
173 }
174
175 return AVERROR_EOF;
176}
177
178static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
179{
180 TAKDemuxContext *tc = s->priv_data;
181 int ret;
182
183 if (tc->mlast_frame) {
184 AVIOContext *pb = s->pb;
185 int64_t size, left;
186
187 left = tc->data_end - avio_tell(pb);
188 size = FFMIN(left, 1024);
189 if (size <= 0)
190 return AVERROR_EOF;
191
192 ret = av_get_packet(pb, pkt, size);
193 if (ret < 0)
194 return ret;
195
196 pkt->stream_index = 0;
197 } else {
198 ret = ff_raw_read_partial_packet(s, pkt);
199 }
200
201 return ret;
202}
203
204AVInputFormat ff_tak_demuxer = {
205 .name = "tak",
206 .long_name = NULL_IF_CONFIG_SMALL("raw TAK"),
207 .priv_data_size = sizeof(TAKDemuxContext),
208 .read_probe = tak_probe,
209 .read_header = tak_read_header,
210 .read_packet = raw_read_packet,
211 .flags = AVFMT_GENERIC_INDEX,
212 .extensions = "tak",
213 .raw_codec_id = AV_CODEC_ID_TAK,
214};
215
generated by cgit at 2024-05-17 05:13:02 (GMT)