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 {
38 static int tak_probe(AVProbeData *p)
40 if (!memcmp(p->buf, "tBaK", 4))
41 return AVPROBE_SCORE_EXTENSION;
45 static unsigned long tak_check_crc(unsigned long checksum, const uint8_t *buf,
48 return av_crc(av_crc_get_table(AV_CRC_24_IEEE), checksum, buf, len);
51 static int tak_read_header(AVFormatContext *s)
53 TAKDemuxContext *tc = s->priv_data;
54 AVIOContext *pb = s->pb;
57 uint8_t *buffer = NULL;
60 st = avformat_new_stream(s, 0);
62 return AVERROR(ENOMEM);
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;
69 if (avio_rl32(pb) != MKTAG('t', 'B', 'a', 'K')) {
70 avio_seek(pb, -4, SEEK_CUR);
74 while (!avio_feof(pb)) {
75 enum TAKMetaDataType type;
78 type = avio_r8(pb) & 0x7f;
82 case TAK_METADATA_STREAMINFO:
83 case TAK_METADATA_LAST_FRAME:
84 case TAK_METADATA_ENCODER:
86 return AVERROR_INVALIDDATA;
88 buffer = av_malloc(size - 3 + AV_INPUT_BUFFER_PADDING_SIZE);
90 return AVERROR(ENOMEM);
91 memset(buffer + size - 3, 0, AV_INPUT_BUFFER_PADDING_SIZE);
93 ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U);
94 if (avio_read(pb, buffer, size - 3) != size - 3) {
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) {
102 return AVERROR_INVALIDDATA;
106 init_get_bits8(&gb, buffer, size - 3);
108 case TAK_METADATA_MD5: {
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;
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");
128 case TAK_METADATA_END: {
129 int64_t curpos = avio_tell(pb);
131 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
133 avio_seek(pb, curpos, SEEK_SET);
136 tc->data_end += curpos;
140 ret = avio_skip(pb, size);
145 if (type == TAK_METADATA_STREAMINFO) {
148 avpriv_tak_parse_streaminfo(&gb, &ti);
150 st->duration = ti.samples;
151 st->codecpar->bits_per_coded_sample = ti.bps;
153 st->codecpar->channel_layout = ti.ch_layout;
154 st->codecpar->sample_rate = ti.sample_rate;
155 st->codecpar->channels = ti.channels;
157 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
158 st->codecpar->extradata = buffer;
159 st->codecpar->extradata_size = size - 3;
161 } else if (type == TAK_METADATA_LAST_FRAME) {
163 return AVERROR_INVALIDDATA;
165 tc->data_end = get_bits64(&gb, TAK_LAST_FRAME_POS_BITS) +
166 get_bits(&gb, TAK_LAST_FRAME_SIZE_BITS);
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));
178 static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
180 TAKDemuxContext *tc = s->priv_data;
183 if (tc->mlast_frame) {
184 AVIOContext *pb = s->pb;
187 left = tc->data_end - avio_tell(pb);
188 size = FFMIN(left, 1024);
192 ret = av_get_packet(pb, pkt, size);
196 pkt->stream_index = 0;
198 ret = ff_raw_read_partial_packet(s, pkt);
204 AVInputFormat ff_tak_demuxer = {
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,
213 .raw_codec_id = AV_CODEC_ID_TAK,