db678d65e86ca815c997eeba36058b682ebca0e3
[ffmpeg.git] / libavformat / idroqdec.c
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
47 typedef 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
62 static 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
71 static 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
94 static 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
237 AVInputFormat 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 };