Imported Debian version 2.5.2~trusty
[deb_ffmpeg.git] / ffmpeg / libavformat / idroqdec.c
... / ...
CommitLineData
1/*
2 * id RoQ (.roq) File Demuxer
3 * Copyright (c) 2003 The FFmpeg Project
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/**
23 * @file
24 * id RoQ format file demuxer
25 * by Mike Melanson (melanson@pcisys.net)
26 * for more information on the .roq file format, visit:
27 * http://www.csse.monash.edu.au/~timf/
28 */
29
30#include "libavutil/channel_layout.h"
31#include "libavutil/intreadwrite.h"
32#include "avformat.h"
33#include "internal.h"
34#include "avio_internal.h"
35
36#define RoQ_MAGIC_NUMBER 0x1084
37#define RoQ_CHUNK_PREAMBLE_SIZE 8
38#define RoQ_AUDIO_SAMPLE_RATE 22050
39#define RoQ_CHUNKS_TO_SCAN 30
40
41#define RoQ_INFO 0x1001
42#define RoQ_QUAD_CODEBOOK 0x1002
43#define RoQ_QUAD_VQ 0x1011
44#define RoQ_SOUND_MONO 0x1020
45#define RoQ_SOUND_STEREO 0x1021
46
47typedef struct RoqDemuxContext {
48
49 int frame_rate;
50 int width;
51 int height;
52 int audio_channels;
53
54 int video_stream_index;
55 int audio_stream_index;
56
57 int64_t video_pts;
58 unsigned int audio_frame_count;
59
60} RoqDemuxContext;
61
62static int roq_probe(AVProbeData *p)
63{
64 if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
65 (AV_RL32(&p->buf[2]) != 0xFFFFFFFF))
66 return 0;
67
68 return AVPROBE_SCORE_MAX;
69}
70
71static int roq_read_header(AVFormatContext *s)
72{
73 RoqDemuxContext *roq = s->priv_data;
74 AVIOContext *pb = s->pb;
75 unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
76
77 /* get the main header */
78 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
79 RoQ_CHUNK_PREAMBLE_SIZE)
80 return AVERROR(EIO);
81 roq->frame_rate = AV_RL16(&preamble[6]);
82
83 /* init private context parameters */
84 roq->width = roq->height = roq->audio_channels = roq->video_pts =
85 roq->audio_frame_count = 0;
86 roq->audio_stream_index = -1;
87 roq->video_stream_index = -1;
88
89 s->ctx_flags |= AVFMTCTX_NOHEADER;
90
91 return 0;
92}
93
94static int roq_read_packet(AVFormatContext *s,
95 AVPacket *pkt)
96{
97 RoqDemuxContext *roq = s->priv_data;
98 AVIOContext *pb = s->pb;
99 int ret = 0;
100 unsigned int chunk_size;
101 unsigned int chunk_type;
102 unsigned int codebook_size;
103 unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
104 int packet_read = 0;
105 int64_t codebook_offset;
106
107 while (!packet_read) {
108
109 if (avio_feof(s->pb))
110 return AVERROR(EIO);
111
112 /* get the next chunk preamble */
113 if ((ret = avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
114 RoQ_CHUNK_PREAMBLE_SIZE)
115 return AVERROR(EIO);
116
117 chunk_type = AV_RL16(&preamble[0]);
118 chunk_size = AV_RL32(&preamble[2]);
119 if(chunk_size > INT_MAX)
120 return AVERROR_INVALIDDATA;
121
122 chunk_size = ffio_limit(pb, chunk_size);
123
124 switch (chunk_type) {
125
126 case RoQ_INFO:
127 if (roq->video_stream_index == -1) {
128 AVStream *st = avformat_new_stream(s, NULL);
129 if (!st)
130 return AVERROR(ENOMEM);
131 avpriv_set_pts_info(st, 63, 1, roq->frame_rate);
132 roq->video_stream_index = st->index;
133 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
134 st->codec->codec_id = AV_CODEC_ID_ROQ;
135 st->codec->codec_tag = 0; /* no fourcc */
136
137 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE)
138 return AVERROR(EIO);
139 st->codec->width = roq->width = AV_RL16(preamble);
140 st->codec->height = roq->height = AV_RL16(preamble + 2);
141 break;
142 }
143 /* don't care about this chunk anymore */
144 avio_skip(pb, RoQ_CHUNK_PREAMBLE_SIZE);
145 break;
146
147 case RoQ_QUAD_CODEBOOK:
148 if (roq->video_stream_index < 0)
149 return AVERROR_INVALIDDATA;
150 /* packet needs to contain both this codebook and next VQ chunk */
151 codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
152 codebook_size = chunk_size;
153 avio_skip(pb, codebook_size);
154 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
155 RoQ_CHUNK_PREAMBLE_SIZE)
156 return AVERROR(EIO);
157 chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
158 codebook_size;
159
160 /* rewind */
161 avio_seek(pb, codebook_offset, SEEK_SET);
162
163 /* load up the packet */
164 ret= av_get_packet(pb, pkt, chunk_size);
165 if (ret != chunk_size)
166 return AVERROR(EIO);
167 pkt->stream_index = roq->video_stream_index;
168 pkt->pts = roq->video_pts++;
169
170 packet_read = 1;
171 break;
172
173 case RoQ_SOUND_MONO:
174 case RoQ_SOUND_STEREO:
175 if (roq->audio_stream_index == -1) {
176 AVStream *st = avformat_new_stream(s, NULL);
177 if (!st)
178 return AVERROR(ENOMEM);
179 avpriv_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE);
180 roq->audio_stream_index = st->index;
181 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
182 st->codec->codec_id = AV_CODEC_ID_ROQ_DPCM;
183 st->codec->codec_tag = 0; /* no tag */
184 if (chunk_type == RoQ_SOUND_STEREO) {
185 st->codec->channels = 2;
186 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
187 } else {
188 st->codec->channels = 1;
189 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
190 }
191 roq->audio_channels = st->codec->channels;
192 st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
193 st->codec->bits_per_coded_sample = 16;
194 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
195 st->codec->bits_per_coded_sample;
196 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
197 }
198 case RoQ_QUAD_VQ:
199 if (chunk_type == RoQ_QUAD_VQ) {
200 if (roq->video_stream_index < 0)
201 return AVERROR_INVALIDDATA;
202 }
203
204 /* load up the packet */
205 if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
206 return AVERROR(EIO);
207 /* copy over preamble */
208 memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
209
210 if (chunk_type == RoQ_QUAD_VQ) {
211 pkt->stream_index = roq->video_stream_index;
212 pkt->pts = roq->video_pts++;
213 } else {
214 pkt->stream_index = roq->audio_stream_index;
215 pkt->pts = roq->audio_frame_count;
216 roq->audio_frame_count += (chunk_size / roq->audio_channels);
217 }
218
219 pkt->pos= avio_tell(pb);
220 ret = avio_read(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
221 chunk_size);
222 if (ret != chunk_size)
223 ret = AVERROR(EIO);
224
225 packet_read = 1;
226 break;
227
228 default:
229 av_log(s, AV_LOG_ERROR, " unknown RoQ chunk (%04X)\n", chunk_type);
230 return AVERROR_INVALIDDATA;
231 }
232 }
233
234 return ret;
235}
236
237AVInputFormat ff_roq_demuxer = {
238 .name = "roq",
239 .long_name = NULL_IF_CONFIG_SMALL("id RoQ"),
240 .priv_data_size = sizeof(RoqDemuxContext),
241 .read_probe = roq_probe,
242 .read_header = roq_read_header,
243 .read_packet = roq_read_packet,
244};