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 (!url_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);
89 ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U);
90 if (avio_read(pb, buffer, size - 3) != size - 3) {
94 if (ffio_get_checksum(s->pb) != avio_rb24(pb)) {
95 av_log(s, AV_LOG_ERROR, "%d metadata block CRC error.\n", type);
96 if (s->error_recognition & AV_EF_EXPLODE) {
98 return AVERROR_INVALIDDATA;
102 init_get_bits8(&gb, buffer, size - 3);
104 case TAK_METADATA_MD5: {
109 return AVERROR_INVALIDDATA;
110 ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U);
111 avio_read(pb, md5, 16);
112 if (ffio_get_checksum(s->pb) != avio_rb24(pb)) {
113 av_log(s, AV_LOG_ERROR, "MD5 metadata block CRC error.\n");
114 if (s->error_recognition & AV_EF_EXPLODE)
115 return AVERROR_INVALIDDATA;
118 av_log(s, AV_LOG_VERBOSE, "MD5=");
119 for (i = 0; i < 16; i++)
120 av_log(s, AV_LOG_VERBOSE, "%02x", md5[i]);
121 av_log(s, AV_LOG_VERBOSE, "\n");
124 case TAK_METADATA_END: {
125 int64_t curpos = avio_tell(pb);
129 avio_seek(pb, curpos, SEEK_SET);
132 tc->data_end += curpos;
136 ret = avio_skip(pb, size);
141 if (type == TAK_METADATA_STREAMINFO) {
144 avpriv_tak_parse_streaminfo(&gb, &ti);
146 st->duration = ti.samples;
147 st->codec->bits_per_coded_sample = ti.bps;
149 st->codec->channel_layout = ti.ch_layout;
150 st->codec->sample_rate = ti.sample_rate;
151 st->codec->channels = ti.channels;
153 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
154 st->codec->extradata = buffer;
155 st->codec->extradata_size = size - 3;
157 } else if (type == TAK_METADATA_LAST_FRAME) {
159 return AVERROR_INVALIDDATA;
161 tc->data_end = get_bits64(&gb, TAK_LAST_FRAME_POS_BITS) +
162 get_bits(&gb, TAK_LAST_FRAME_SIZE_BITS);
164 } else if (type == TAK_METADATA_ENCODER) {
165 av_log(s, AV_LOG_VERBOSE, "encoder version: %0X\n",
166 get_bits_long(&gb, TAK_ENCODER_VERSION_BITS));
174 static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
176 TAKDemuxContext *tc = s->priv_data;
179 if (tc->mlast_frame) {
180 AVIOContext *pb = s->pb;
183 left = tc->data_end - avio_tell(pb);
184 size = FFMIN(left, 1024);
188 ret = av_get_packet(pb, pkt, size);
192 pkt->stream_index = 0;
194 ret = ff_raw_read_partial_packet(s, pkt);
200 AVInputFormat ff_tak_demuxer = {
202 .long_name = NULL_IF_CONFIG_SMALL("raw TAK"),
203 .priv_data_size = sizeof(TAKDemuxContext),
204 .read_probe = tak_probe,
205 .read_header = tak_read_header,
206 .read_packet = raw_read_packet,
207 .flags = AVFMT_GENERIC_INDEX,
209 .raw_codec_id = AV_CODEC_ID_TAK,