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