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
33 typedef struct TAKDemuxContext {
34 AVClass *class;
35 int raw_packet_size;
36 int mlast_frame;
37 int64_t data_end;
38 } TAKDemuxContext;
39
tak_probe(const AVProbeData * p)40 static int tak_probe(const AVProbeData *p)
41 {
42 if (!memcmp(p->buf, "tBaK", 4))
43 return AVPROBE_SCORE_EXTENSION;
44 return 0;
45 }
46
tak_check_crc(unsigned long checksum,const uint8_t * buf,unsigned int len)47 static unsigned long tak_check_crc(unsigned long checksum, const uint8_t *buf,
48 unsigned int len)
49 {
50 return av_crc(av_crc_get_table(AV_CRC_24_IEEE), checksum, buf, len);
51 }
52
tak_read_header(AVFormatContext * s)53 static int tak_read_header(AVFormatContext *s)
54 {
55 TAKDemuxContext *tc = s->priv_data;
56 AVIOContext *pb = s->pb;
57 GetBitContext gb;
58 AVStream *st;
59 uint8_t *buffer = NULL;
60 int ret;
61
62 st = avformat_new_stream(s, 0);
63 if (!st)
64 return AVERROR(ENOMEM);
65
66 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
67 st->codecpar->codec_id = AV_CODEC_ID_TAK;
68 st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
69
70 tc->mlast_frame = 0;
71 if (avio_rl32(pb) != MKTAG('t', 'B', 'a', 'K')) {
72 avio_seek(pb, -4, SEEK_CUR);
73 return 0;
74 }
75
76 while (!avio_feof(pb)) {
77 enum TAKMetaDataType type;
78 int size;
79
80 type = avio_r8(pb) & 0x7f;
81 size = avio_rl24(pb);
82
83 switch (type) {
84 case TAK_METADATA_STREAMINFO:
85 if (st->codecpar->extradata)
86 return AVERROR_INVALIDDATA;
87 case TAK_METADATA_LAST_FRAME:
88 case TAK_METADATA_ENCODER:
89 if (size <= 3)
90 return AVERROR_INVALIDDATA;
91
92 buffer = av_malloc(size - 3 + AV_INPUT_BUFFER_PADDING_SIZE);
93 if (!buffer)
94 return AVERROR(ENOMEM);
95 memset(buffer + size - 3, 0, AV_INPUT_BUFFER_PADDING_SIZE);
96
97 ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U);
98 if (avio_read(pb, buffer, size - 3) != size - 3) {
99 av_freep(&buffer);
100 return AVERROR(EIO);
101 }
102 if (ffio_get_checksum(s->pb) != avio_rb24(pb)) {
103 av_log(s, AV_LOG_ERROR, "%d metadata block CRC error.\n", type);
104 if (s->error_recognition & AV_EF_EXPLODE) {
105 av_freep(&buffer);
106 return AVERROR_INVALIDDATA;
107 }
108 }
109
110 break;
111 case TAK_METADATA_MD5: {
112 uint8_t md5[16];
113 int i;
114
115 if (size != 19)
116 return AVERROR_INVALIDDATA;
117 ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U);
118 avio_read(pb, md5, 16);
119 if (ffio_get_checksum(s->pb) != avio_rb24(pb)) {
120 av_log(s, AV_LOG_ERROR, "MD5 metadata block CRC error.\n");
121 if (s->error_recognition & AV_EF_EXPLODE)
122 return AVERROR_INVALIDDATA;
123 }
124
125 av_log(s, AV_LOG_VERBOSE, "MD5=");
126 for (i = 0; i < 16; i++)
127 av_log(s, AV_LOG_VERBOSE, "%02x", md5[i]);
128 av_log(s, AV_LOG_VERBOSE, "\n");
129 break;
130 }
131 case TAK_METADATA_END: {
132 int64_t curpos = avio_tell(pb);
133
134 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
135 ff_ape_parse_tag(s);
136 avio_seek(pb, curpos, SEEK_SET);
137 }
138
139 tc->data_end += curpos;
140 return 0;
141 }
142 default:
143 ret = avio_skip(pb, size);
144 if (ret < 0)
145 return ret;
146 }
147
148 if (type == TAK_METADATA_STREAMINFO) {
149 TAKStreamInfo ti;
150
151 ret = avpriv_tak_parse_streaminfo(&ti, buffer, size -3);
152 if (ret < 0)
153 goto end;
154 if (ti.samples > 0)
155 st->duration = ti.samples;
156 st->codecpar->bits_per_coded_sample = ti.bps;
157 if (ti.ch_layout)
158 st->codecpar->channel_layout = ti.ch_layout;
159 st->codecpar->sample_rate = ti.sample_rate;
160 st->codecpar->channels = ti.channels;
161 st->start_time = 0;
162 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
163 st->codecpar->extradata = buffer;
164 st->codecpar->extradata_size = size - 3;
165 buffer = NULL;
166 } else if (type == TAK_METADATA_LAST_FRAME) {
167 if (size != 11) {
168 ret = AVERROR_INVALIDDATA;
169 goto end;
170 }
171 init_get_bits8(&gb, buffer, size - 3);
172 tc->mlast_frame = 1;
173 tc->data_end = get_bits64(&gb, TAK_LAST_FRAME_POS_BITS) +
174 get_bits(&gb, TAK_LAST_FRAME_SIZE_BITS);
175 av_freep(&buffer);
176 } else if (type == TAK_METADATA_ENCODER) {
177 init_get_bits8(&gb, buffer, size - 3);
178 av_log(s, AV_LOG_VERBOSE, "encoder version: %0X\n",
179 get_bits_long(&gb, TAK_ENCODER_VERSION_BITS));
180 av_freep(&buffer);
181 }
182 }
183
184 return AVERROR_EOF;
185 end:
186 av_freep(&buffer);
187 return ret;
188 }
189
raw_read_packet(AVFormatContext * s,AVPacket * pkt)190 static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
191 {
192 TAKDemuxContext *tc = s->priv_data;
193 int ret;
194
195 if (tc->mlast_frame) {
196 AVIOContext *pb = s->pb;
197 int64_t size, left;
198
199 left = tc->data_end - avio_tell(pb);
200 size = FFMIN(left, 1024);
201 if (size <= 0)
202 return AVERROR_EOF;
203
204 ret = av_get_packet(pb, pkt, size);
205 if (ret < 0)
206 return ret;
207
208 pkt->stream_index = 0;
209 } else {
210 ret = ff_raw_read_partial_packet(s, pkt);
211 }
212
213 return ret;
214 }
215
216 FF_RAW_DEMUXER_CLASS(tak)
217 AVInputFormat ff_tak_demuxer = {
218 .name = "tak",
219 .long_name = NULL_IF_CONFIG_SMALL("raw TAK"),
220 .priv_data_size = sizeof(TAKDemuxContext),
221 .read_probe = tak_probe,
222 .read_header = tak_read_header,
223 .read_packet = raw_read_packet,
224 .flags = AVFMT_GENERIC_INDEX,
225 .extensions = "tak",
226 .raw_codec_id = AV_CODEC_ID_TAK,
227 .priv_class = &tak_demuxer_class,
228 };
229