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 FFRawDemuxerContext rawctx;
35 int mlast_frame;
36 int64_t data_end;
37 } TAKDemuxContext;
38
tak_probe(const AVProbeData * p)39 static int tak_probe(const AVProbeData *p)
40 {
41 if (!memcmp(p->buf, "tBaK", 4))
42 return AVPROBE_SCORE_EXTENSION;
43 return 0;
44 }
45
tak_check_crc(unsigned long checksum,const uint8_t * buf,unsigned int len)46 static unsigned long tak_check_crc(unsigned long checksum, const uint8_t *buf,
47 unsigned int len)
48 {
49 return av_crc(av_crc_get_table(AV_CRC_24_IEEE), checksum, buf, len);
50 }
51
tak_read_header(AVFormatContext * s)52 static int tak_read_header(AVFormatContext *s)
53 {
54 TAKDemuxContext *tc = s->priv_data;
55 AVIOContext *pb = s->pb;
56 GetBitContext gb;
57 AVStream *st;
58 uint8_t *buffer = NULL;
59 int ret;
60
61 st = avformat_new_stream(s, 0);
62 if (!st)
63 return AVERROR(ENOMEM);
64
65 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
66 st->codecpar->codec_id = AV_CODEC_ID_TAK;
67 ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
68
69 tc->mlast_frame = 0;
70 if (avio_rl32(pb) != MKTAG('t', 'B', 'a', 'K')) {
71 avio_seek(pb, -4, SEEK_CUR);
72 return 0;
73 }
74
75 while (!avio_feof(pb)) {
76 enum TAKMetaDataType type;
77 int size;
78
79 type = avio_r8(pb) & 0x7f;
80 size = avio_rl24(pb);
81
82 switch (type) {
83 case TAK_METADATA_STREAMINFO:
84 if (st->codecpar->extradata)
85 return AVERROR_INVALIDDATA;
86 case TAK_METADATA_LAST_FRAME:
87 case TAK_METADATA_ENCODER:
88 if (size <= 3)
89 return AVERROR_INVALIDDATA;
90
91 buffer = av_malloc(size - 3 + AV_INPUT_BUFFER_PADDING_SIZE);
92 if (!buffer)
93 return AVERROR(ENOMEM);
94 memset(buffer + size - 3, 0, AV_INPUT_BUFFER_PADDING_SIZE);
95
96 ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U);
97 if (avio_read(pb, buffer, size - 3) != size - 3) {
98 av_freep(&buffer);
99 return AVERROR(EIO);
100 }
101 if (ffio_get_checksum(s->pb) != avio_rb24(pb)) {
102 av_log(s, AV_LOG_ERROR, "%d metadata block CRC error.\n", type);
103 if (s->error_recognition & AV_EF_EXPLODE) {
104 av_freep(&buffer);
105 return AVERROR_INVALIDDATA;
106 }
107 }
108
109 break;
110 case TAK_METADATA_MD5: {
111 uint8_t md5[16];
112 char md5_hex[2 * sizeof(md5) + 1];
113
114 if (size != 19)
115 return AVERROR_INVALIDDATA;
116 ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U);
117 avio_read(pb, md5, 16);
118 if (ffio_get_checksum(s->pb) != avio_rb24(pb)) {
119 av_log(s, AV_LOG_ERROR, "MD5 metadata block CRC error.\n");
120 if (s->error_recognition & AV_EF_EXPLODE)
121 return AVERROR_INVALIDDATA;
122 }
123
124 ff_data_to_hex(md5_hex, md5, sizeof(md5), 1);
125 av_log(s, AV_LOG_VERBOSE, "MD5=%s\n", md5_hex);
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 ret = avpriv_tak_parse_streaminfo(&ti, buffer, size -3);
149 if (ret < 0)
150 goto end;
151 if (ti.samples > 0)
152 st->duration = ti.samples;
153 st->codecpar->bits_per_coded_sample = ti.bps;
154 if (ti.ch_layout)
155 av_channel_layout_from_mask(&st->codecpar->ch_layout, ti.ch_layout);
156 else {
157 av_channel_layout_uninit(&st->codecpar->ch_layout);
158 st->codecpar->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
159 st->codecpar->ch_layout.nb_channels = ti.channels;
160 }
161 st->codecpar->sample_rate = ti.sample_rate;
162 st->start_time = 0;
163 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
164 st->codecpar->extradata = buffer;
165 st->codecpar->extradata_size = size - 3;
166 buffer = NULL;
167 } else if (type == TAK_METADATA_LAST_FRAME) {
168 if (size != 11) {
169 ret = AVERROR_INVALIDDATA;
170 goto end;
171 }
172 init_get_bits8(&gb, buffer, size - 3);
173 tc->mlast_frame = 1;
174 tc->data_end = get_bits64(&gb, TAK_LAST_FRAME_POS_BITS) +
175 get_bits(&gb, TAK_LAST_FRAME_SIZE_BITS);
176 av_freep(&buffer);
177 } else if (type == TAK_METADATA_ENCODER) {
178 av_log(s, AV_LOG_VERBOSE, "encoder version: %0X\n",
179 AV_RL24(buffer));
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 const AVInputFormat ff_tak_demuxer = {
217 .name = "tak",
218 .long_name = NULL_IF_CONFIG_SMALL("raw TAK"),
219 .priv_data_size = sizeof(TAKDemuxContext),
220 .read_probe = tak_probe,
221 .read_header = tak_read_header,
222 .read_packet = raw_read_packet,
223 .flags = AVFMT_GENERIC_INDEX,
224 .extensions = "tak",
225 .raw_codec_id = AV_CODEC_ID_TAK,
226 .priv_class = &ff_raw_demuxer_class,
227 };
228