Imported Debian version 2.5.2~trusty
[deb_ffmpeg.git] / ffmpeg / libavformat / redspark.c
... / ...
CommitLineData
1/*
2 * RedSpark demuxer
3 * Copyright (c) 2013 James Almer
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/bytestream.h"
23#include "libavutil/intreadwrite.h"
24#include "avformat.h"
25#include "avio.h"
26#include "internal.h"
27
28#define HEADER_SIZE 4096
29
30typedef struct RedSparkContext {
31 int samples_count;
32} RedSparkContext;
33
34static int redspark_probe(AVProbeData *p)
35{
36 uint32_t key, data;
37 uint8_t header[8];
38
39 /* Decrypt first 8 bytes of the header */
40 data = AV_RB32(p->buf);
41 data = data ^ (key = data ^ 0x52656453);
42 AV_WB32(header, data);
43 key = (key << 11) | (key >> 21);
44
45 data = AV_RB32(p->buf + 4) ^ (((key << 3) | (key >> 29)) + key);
46 AV_WB32(header + 4, data);
47
48 if (AV_RB64(header) == AV_RB64("RedSpark"))
49 return AVPROBE_SCORE_MAX;
50
51 return 0;
52}
53
54static int redspark_read_header(AVFormatContext *s)
55{
56 AVIOContext *pb = s->pb;
57 RedSparkContext *redspark = s->priv_data;
58 AVCodecContext *codec;
59 GetByteContext gbc;
60 int i, coef_off, ret = 0;
61 uint32_t key, data;
62 uint8_t *header, *pbc;
63 AVStream *st;
64
65 st = avformat_new_stream(s, NULL);
66 if (!st)
67 return AVERROR(ENOMEM);
68 codec = st->codec;
69
70 header = av_malloc(HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
71 if (!header)
72 return AVERROR(ENOMEM);
73 pbc = header;
74
75 /* Decrypt header */
76 data = avio_rb32(pb);
77 data = data ^ (key = data ^ 0x52656453);
78 bytestream_put_be32(&pbc, data);
79 key = (key << 11) | (key >> 21);
80
81 for (i = 4; i < HEADER_SIZE; i += 4) {
82 data = avio_rb32(pb) ^ (key = ((key << 3) | (key >> 29)) + key);
83 bytestream_put_be32(&pbc, data);
84 }
85
86 codec->codec_id = AV_CODEC_ID_ADPCM_THP;
87 codec->codec_type = AVMEDIA_TYPE_AUDIO;
88
89 bytestream2_init(&gbc, header, HEADER_SIZE);
90 bytestream2_seek(&gbc, 0x3c, SEEK_SET);
91 codec->sample_rate = bytestream2_get_be32u(&gbc);
92 if (codec->sample_rate <= 0 || codec->sample_rate > 96000) {
93 av_log(s, AV_LOG_ERROR, "Invalid sample rate: %d\n", codec->sample_rate);
94 ret = AVERROR_INVALIDDATA;
95 goto fail;
96 }
97
98 st->duration = bytestream2_get_be32u(&gbc) * 14;
99 redspark->samples_count = 0;
100 bytestream2_skipu(&gbc, 10);
101 codec->channels = bytestream2_get_byteu(&gbc);
102 if (!codec->channels) {
103 ret = AVERROR_INVALIDDATA;
104 goto fail;
105 }
106
107 coef_off = 0x54 + codec->channels * 8;
108 if (bytestream2_get_byteu(&gbc)) // Loop flag
109 coef_off += 16;
110
111 if (coef_off + codec->channels * (32 + 14) > HEADER_SIZE) {
112 ret = AVERROR_INVALIDDATA;
113 goto fail;
114 }
115
116 if (ff_alloc_extradata(codec, 32 * codec->channels)) {
117 ret = AVERROR(ENOMEM);
118 goto fail;
119 }
120
121 /* Get the ADPCM table */
122 bytestream2_seek(&gbc, coef_off, SEEK_SET);
123 for (i = 0; i < codec->channels; i++) {
124 if (bytestream2_get_bufferu(&gbc, codec->extradata + i * 32, 32) != 32) {
125 ret = AVERROR_INVALIDDATA;
126 goto fail;
127 }
128 bytestream2_skipu(&gbc, 14);
129 }
130
131 avpriv_set_pts_info(st, 64, 1, codec->sample_rate);
132
133fail:
134 av_free(header);
135
136 return ret;
137}
138
139static int redspark_read_packet(AVFormatContext *s, AVPacket *pkt)
140{
141 AVCodecContext *codec = s->streams[0]->codec;
142 RedSparkContext *redspark = s->priv_data;
143 uint32_t size = 8 * codec->channels;
144 int ret;
145
146 if (avio_feof(s->pb) || redspark->samples_count == s->streams[0]->duration)
147 return AVERROR_EOF;
148
149 ret = av_get_packet(s->pb, pkt, size);
150 if (ret != size) {
151 av_free_packet(pkt);
152 return AVERROR(EIO);
153 }
154
155 pkt->duration = 14;
156 redspark->samples_count += pkt->duration;
157 pkt->stream_index = 0;
158
159 return ret;
160}
161
162AVInputFormat ff_redspark_demuxer = {
163 .name = "redspark",
164 .long_name = NULL_IF_CONFIG_SMALL("RedSpark"),
165 .priv_data_size = sizeof(RedSparkContext),
166 .read_probe = redspark_probe,
167 .read_header = redspark_read_header,
168 .read_packet = redspark_read_packet,
169 .extensions = "rsd",
170};