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takdec.c
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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 "libavcodec/tak.h"
23 #include "avformat.h"
24 #include "internal.h"
25 #include "rawdec.h"
26 #include "apetag.h"
27 
28 typedef struct TAKDemuxContext {
30  int64_t data_end;
32 
33 static int tak_probe(AVProbeData *p)
34 {
35  if (!memcmp(p->buf, "tBaK", 4))
36  return AVPROBE_SCORE_MAX / 2;
37  return 0;
38 }
39 
41 {
42  TAKDemuxContext *tc = s->priv_data;
43  AVIOContext *pb = s->pb;
44  GetBitContext gb;
45  AVStream *st;
46  uint8_t *buffer = NULL;
47  int ret;
48 
49  st = avformat_new_stream(s, 0);
50  if (!st)
51  return AVERROR(ENOMEM);
52 
56 
57  tc->mlast_frame = 0;
58  if (avio_rl32(pb) != MKTAG('t', 'B', 'a', 'K')) {
59  avio_seek(pb, -4, SEEK_CUR);
60  return 0;
61  }
62 
63  while (!url_feof(pb)) {
64  enum TAKMetaDataType type;
65  int size;
66 
67  type = avio_r8(pb) & 0x7f;
68  size = avio_rl24(pb);
69 
70  switch (type) {
74  buffer = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
75  if (!buffer)
76  return AVERROR(ENOMEM);
77 
78  if (avio_read(pb, buffer, size) != size) {
79  av_freep(&buffer);
80  return AVERROR(EIO);
81  }
82 
83  init_get_bits(&gb, buffer, size * 8);
84  break;
85  case TAK_METADATA_MD5: {
86  uint8_t md5[16];
87  int i;
88 
89  if (size != 19)
90  return AVERROR_INVALIDDATA;
91  avio_read(pb, md5, 16);
92  avio_skip(pb, 3);
93  av_log(s, AV_LOG_VERBOSE, "MD5=");
94  for (i = 0; i < 16; i++)
95  av_log(s, AV_LOG_VERBOSE, "%02x", md5[i]);
96  av_log(s, AV_LOG_VERBOSE, "\n");
97  break;
98  }
99  case TAK_METADATA_END: {
100  int64_t curpos = avio_tell(pb);
101 
102  if (pb->seekable) {
103  ff_ape_parse_tag(s);
104  avio_seek(pb, curpos, SEEK_SET);
105  }
106 
107  tc->data_end += curpos;
108  return 0;
109  }
110  default:
111  ret = avio_skip(pb, size);
112  if (ret < 0)
113  return ret;
114  }
115 
116  if (type == TAK_METADATA_STREAMINFO) {
117  TAKStreamInfo ti;
118 
119  avpriv_tak_parse_streaminfo(&gb, &ti);
120  if (ti.samples > 0)
121  st->duration = ti.samples;
122  st->codec->bits_per_coded_sample = ti.bps;
123  if (ti.ch_layout)
124  st->codec->channel_layout = ti.ch_layout;
125  st->codec->sample_rate = ti.sample_rate;
126  st->codec->channels = ti.channels;
127  st->start_time = 0;
128  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
129  st->codec->extradata = buffer;
130  st->codec->extradata_size = size;
131  buffer = NULL;
132  } else if (type == TAK_METADATA_LAST_FRAME) {
133  if (size != 11)
134  return AVERROR_INVALIDDATA;
135  tc->mlast_frame = 1;
138  av_freep(&buffer);
139  } else if (type == TAK_METADATA_ENCODER) {
140  av_log(s, AV_LOG_VERBOSE, "encoder version: %0X\n",
142  av_freep(&buffer);
143  }
144  }
145 
146  return AVERROR_EOF;
147 }
148 
150 {
151  TAKDemuxContext *tc = s->priv_data;
152  int ret;
153 
154  if (tc->mlast_frame) {
155  AVIOContext *pb = s->pb;
156  int64_t size, left;
157 
158  left = tc->data_end - avio_tell(s->pb);
159  size = FFMIN(left, 1024);
160  if (size <= 0)
161  return AVERROR_EOF;
162 
163  ret = av_get_packet(pb, pkt, size);
164  if (ret < 0)
165  return ret;
166 
167  pkt->stream_index = 0;
168  } else {
169  ret = ff_raw_read_partial_packet(s, pkt);
170  }
171 
172  return ret;
173 }
174 
176  .name = "tak",
177  .long_name = NULL_IF_CONFIG_SMALL("raw TAK"),
178  .priv_data_size = sizeof(TAKDemuxContext),
183  .extensions = "tak",
184  .raw_codec_id = AV_CODEC_ID_TAK,
185 };