3 * Copyright (c) 2012 Paul B Mahol
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/crc.h"
24 #define BITSTREAM_READER_LE
25 #include "libavcodec/tak.h"
29 #include "avio_internal.h"
33 typedef struct TAKDemuxContext {
40 static int tak_probe(const AVProbeData *p)
42 if (!memcmp(p->buf, "tBaK", 4))
43 return AVPROBE_SCORE_EXTENSION;
47 static unsigned long tak_check_crc(unsigned long checksum, const uint8_t *buf,
50 return av_crc(av_crc_get_table(AV_CRC_24_IEEE), checksum, buf, len);
53 static int tak_read_header(AVFormatContext *s)
55 TAKDemuxContext *tc = s->priv_data;
56 AVIOContext *pb = s->pb;
59 uint8_t *buffer = NULL;
62 st = avformat_new_stream(s, 0);
64 return AVERROR(ENOMEM);
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;
71 if (avio_rl32(pb) != MKTAG('t', 'B', 'a', 'K')) {
72 avio_seek(pb, -4, SEEK_CUR);
76 while (!avio_feof(pb)) {
77 enum TAKMetaDataType type;
80 type = avio_r8(pb) & 0x7f;
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:
90 return AVERROR_INVALIDDATA;
92 buffer = av_malloc(size - 3 + AV_INPUT_BUFFER_PADDING_SIZE);
94 return AVERROR(ENOMEM);
95 memset(buffer + size - 3, 0, AV_INPUT_BUFFER_PADDING_SIZE);
97 ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U);
98 if (avio_read(pb, buffer, size - 3) != size - 3) {
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) {
106 return AVERROR_INVALIDDATA;
111 case TAK_METADATA_MD5: {
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;
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");
131 case TAK_METADATA_END: {
132 int64_t curpos = avio_tell(pb);
134 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
136 avio_seek(pb, curpos, SEEK_SET);
139 tc->data_end += curpos;
143 ret = avio_skip(pb, size);
148 if (type == TAK_METADATA_STREAMINFO) {
151 ret = avpriv_tak_parse_streaminfo(&ti, buffer, size -3);
155 st->duration = ti.samples;
156 st->codecpar->bits_per_coded_sample = ti.bps;
158 st->codecpar->channel_layout = ti.ch_layout;
159 st->codecpar->sample_rate = ti.sample_rate;
160 st->codecpar->channels = ti.channels;
162 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
163 st->codecpar->extradata = buffer;
164 st->codecpar->extradata_size = size - 3;
166 } else if (type == TAK_METADATA_LAST_FRAME) {
168 ret = AVERROR_INVALIDDATA;
171 init_get_bits8(&gb, buffer, size - 3);
173 tc->data_end = get_bits64(&gb, TAK_LAST_FRAME_POS_BITS) +
174 get_bits(&gb, TAK_LAST_FRAME_SIZE_BITS);
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));
190 static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
192 TAKDemuxContext *tc = s->priv_data;
195 if (tc->mlast_frame) {
196 AVIOContext *pb = s->pb;
199 left = tc->data_end - avio_tell(pb);
200 size = FFMIN(left, 1024);
204 ret = av_get_packet(pb, pkt, size);
208 pkt->stream_index = 0;
210 ret = ff_raw_read_partial_packet(s, pkt);
216 FF_RAW_DEMUXER_CLASS(tak)
217 AVInputFormat ff_tak_demuxer = {
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,
226 .raw_codec_id = AV_CODEC_ID_TAK,
227 .priv_class = &tak_demuxer_class,