Tizen 2.1 base
[sdk/emulator/qemu.git] / tizen / distrib / libav / libavformat / idroqdec.c
1 /*
2  * id RoQ (.roq) File Demuxer
3  * Copyright (c) 2003 The ffmpeg Project
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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/intreadwrite.h"
31 #include "avformat.h"
32
33 #define RoQ_MAGIC_NUMBER 0x1084
34 #define RoQ_CHUNK_PREAMBLE_SIZE 8
35 #define RoQ_AUDIO_SAMPLE_RATE 22050
36 #define RoQ_CHUNKS_TO_SCAN 30
37
38 #define RoQ_INFO           0x1001
39 #define RoQ_QUAD_CODEBOOK  0x1002
40 #define RoQ_QUAD_VQ        0x1011
41 #define RoQ_SOUND_MONO     0x1020
42 #define RoQ_SOUND_STEREO   0x1021
43
44 typedef struct RoqDemuxContext {
45
46     int width;
47     int height;
48     int audio_channels;
49
50     int video_stream_index;
51     int audio_stream_index;
52
53     int64_t video_pts;
54     unsigned int audio_frame_count;
55
56 } RoqDemuxContext;
57
58 static int roq_probe(AVProbeData *p)
59 {
60     if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
61         (AV_RL32(&p->buf[2]) != 0xFFFFFFFF))
62         return 0;
63
64     return AVPROBE_SCORE_MAX;
65 }
66
67 static int roq_read_header(AVFormatContext *s,
68                            AVFormatParameters *ap)
69 {
70     RoqDemuxContext *roq = s->priv_data;
71     AVIOContext *pb = s->pb;
72     int framerate;
73     AVStream *st;
74     unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
75
76     /* get the main header */
77     if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
78         RoQ_CHUNK_PREAMBLE_SIZE)
79         return AVERROR(EIO);
80     framerate = AV_RL16(&preamble[6]);
81
82     /* init private context parameters */
83     roq->width = roq->height = roq->audio_channels = roq->video_pts =
84     roq->audio_frame_count = 0;
85     roq->audio_stream_index = -1;
86
87     st = av_new_stream(s, 0);
88     if (!st)
89         return AVERROR(ENOMEM);
90     av_set_pts_info(st, 63, 1, framerate);
91     roq->video_stream_index = st->index;
92     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
93     st->codec->codec_id = CODEC_ID_ROQ;
94     st->codec->codec_tag = 0;  /* no fourcc */
95
96     return 0;
97 }
98
99 static int roq_read_packet(AVFormatContext *s,
100                            AVPacket *pkt)
101 {
102     RoqDemuxContext *roq = s->priv_data;
103     AVIOContext *pb = s->pb;
104     int ret = 0;
105     unsigned int chunk_size;
106     unsigned int chunk_type;
107     unsigned int codebook_size;
108     unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
109     int packet_read = 0;
110     int64_t codebook_offset;
111
112     while (!packet_read) {
113
114         if (s->pb->eof_reached)
115             return AVERROR(EIO);
116
117         /* get the next chunk preamble */
118         if ((ret = avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
119             RoQ_CHUNK_PREAMBLE_SIZE)
120             return AVERROR(EIO);
121
122         chunk_type = AV_RL16(&preamble[0]);
123         chunk_size = AV_RL32(&preamble[2]);
124         if(chunk_size > INT_MAX)
125             return AVERROR_INVALIDDATA;
126
127         switch (chunk_type) {
128
129         case RoQ_INFO:
130             if (!roq->width || !roq->height) {
131                 AVStream *st = s->streams[roq->video_stream_index];
132                 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE)
133                     return AVERROR(EIO);
134                 st->codec->width  = roq->width  = AV_RL16(preamble);
135                 st->codec->height = roq->height = AV_RL16(preamble + 2);
136                 break;
137             }
138             /* don't care about this chunk anymore */
139             avio_skip(pb, RoQ_CHUNK_PREAMBLE_SIZE);
140             break;
141
142         case RoQ_QUAD_CODEBOOK:
143             /* packet needs to contain both this codebook and next VQ chunk */
144             codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
145             codebook_size = chunk_size;
146             avio_skip(pb, codebook_size);
147             if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
148                 RoQ_CHUNK_PREAMBLE_SIZE)
149                 return AVERROR(EIO);
150             chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
151                 codebook_size;
152
153             /* rewind */
154             avio_seek(pb, codebook_offset, SEEK_SET);
155
156             /* load up the packet */
157             ret= av_get_packet(pb, pkt, chunk_size);
158             if (ret != chunk_size)
159                 return AVERROR(EIO);
160             pkt->stream_index = roq->video_stream_index;
161             pkt->pts = roq->video_pts++;
162
163             packet_read = 1;
164             break;
165
166         case RoQ_SOUND_MONO:
167         case RoQ_SOUND_STEREO:
168             if (roq->audio_stream_index == -1) {
169                 AVStream *st = av_new_stream(s, 1);
170                 if (!st)
171                     return AVERROR(ENOMEM);
172                 av_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE);
173                 roq->audio_stream_index = st->index;
174                 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
175                 st->codec->codec_id = CODEC_ID_ROQ_DPCM;
176                 st->codec->codec_tag = 0;  /* no tag */
177                 st->codec->channels = roq->audio_channels = chunk_type == RoQ_SOUND_STEREO ? 2 : 1;
178                 st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
179                 st->codec->bits_per_coded_sample = 16;
180                 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
181                     st->codec->bits_per_coded_sample;
182                 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
183             }
184         case RoQ_QUAD_VQ:
185             /* load up the packet */
186             if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
187                 return AVERROR(EIO);
188             /* copy over preamble */
189             memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
190
191             if (chunk_type == RoQ_QUAD_VQ) {
192                 pkt->stream_index = roq->video_stream_index;
193                 pkt->pts = roq->video_pts++;
194             } else {
195                 pkt->stream_index = roq->audio_stream_index;
196                 pkt->pts = roq->audio_frame_count;
197                 roq->audio_frame_count += (chunk_size / roq->audio_channels);
198             }
199
200             pkt->pos= avio_tell(pb);
201             ret = avio_read(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
202                 chunk_size);
203             if (ret != chunk_size)
204                 ret = AVERROR(EIO);
205
206             packet_read = 1;
207             break;
208
209         default:
210             av_log(s, AV_LOG_ERROR, "  unknown RoQ chunk (%04X)\n", chunk_type);
211             return AVERROR_INVALIDDATA;
212             break;
213         }
214     }
215
216     return ret;
217 }
218
219 AVInputFormat ff_roq_demuxer = {
220     "RoQ",
221     NULL_IF_CONFIG_SMALL("id RoQ format"),
222     sizeof(RoqDemuxContext),
223     roq_probe,
224     roq_read_header,
225     roq_read_packet,
226 };