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"
23 #include "libavcodec/tak.h"
25 #include "avio_internal.h"
30 typedef struct TAKDemuxContext {
35 static int tak_probe(AVProbeData *p)
37 if (!memcmp(p->buf, "tBaK", 4))
38 return AVPROBE_SCORE_EXTENSION;
42 static unsigned long tak_check_crc(unsigned long checksum, const uint8_t *buf,
45 return av_crc(av_crc_get_table(AV_CRC_24_IEEE), checksum, buf, len);
48 static int tak_read_header(AVFormatContext *s)
50 TAKDemuxContext *tc = s->priv_data;
51 AVIOContext *pb = s->pb;
54 uint8_t *buffer = NULL;
57 st = avformat_new_stream(s, 0);
59 return AVERROR(ENOMEM);
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;
66 if (avio_rl32(pb) != MKTAG('t', 'B', 'a', 'K')) {
67 avio_seek(pb, -4, SEEK_CUR);
71 while (!avio_feof(pb)) {
72 enum TAKMetaDataType type;
75 type = avio_r8(pb) & 0x7f;
79 case TAK_METADATA_STREAMINFO:
80 case TAK_METADATA_LAST_FRAME:
81 case TAK_METADATA_ENCODER:
83 return AVERROR_INVALIDDATA;
85 buffer = av_malloc(size - 3 + FF_INPUT_BUFFER_PADDING_SIZE);
87 return AVERROR(ENOMEM);
88 memset(buffer + size - 3, 0, FF_INPUT_BUFFER_PADDING_SIZE);
90 ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U);
91 if (avio_read(pb, buffer, size - 3) != size - 3) {
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) {
99 return AVERROR_INVALIDDATA;
103 init_get_bits8(&gb, buffer, size - 3);
105 case TAK_METADATA_MD5: {
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;
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");
125 case TAK_METADATA_END: {
126 int64_t curpos = avio_tell(pb);
130 avio_seek(pb, curpos, SEEK_SET);
133 tc->data_end += curpos;
137 ret = avio_skip(pb, size);
142 if (type == TAK_METADATA_STREAMINFO) {
145 avpriv_tak_parse_streaminfo(&gb, &ti);
147 st->duration = ti.samples;
148 st->codec->bits_per_coded_sample = ti.bps;
150 st->codec->channel_layout = ti.ch_layout;
151 st->codec->sample_rate = ti.sample_rate;
152 st->codec->channels = ti.channels;
154 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
155 st->codec->extradata = buffer;
156 st->codec->extradata_size = size - 3;
158 } else if (type == TAK_METADATA_LAST_FRAME) {
160 return AVERROR_INVALIDDATA;
162 tc->data_end = get_bits64(&gb, TAK_LAST_FRAME_POS_BITS) +
163 get_bits(&gb, TAK_LAST_FRAME_SIZE_BITS);
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));
175 static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
177 TAKDemuxContext *tc = s->priv_data;
180 if (tc->mlast_frame) {
181 AVIOContext *pb = s->pb;
184 left = tc->data_end - avio_tell(pb);
185 size = FFMIN(left, 1024);
189 ret = av_get_packet(pb, pkt, size);
193 pkt->stream_index = 0;
195 ret = ff_raw_read_partial_packet(s, pkt);
201 AVInputFormat ff_tak_demuxer = {
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,
210 .raw_codec_id = AV_CODEC_ID_TAK,