gsm demuxer: use generic seeking instead of a gsm-specific function.
[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 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 #include "internal.h"
33
34 #define RoQ_MAGIC_NUMBER 0x1084
35 #define RoQ_CHUNK_PREAMBLE_SIZE 8
36 #define RoQ_AUDIO_SAMPLE_RATE 22050
37 #define RoQ_CHUNKS_TO_SCAN 30
38
39 #define RoQ_INFO           0x1001
40 #define RoQ_QUAD_CODEBOOK  0x1002
41 #define RoQ_QUAD_VQ        0x1011
42 #define RoQ_SOUND_MONO     0x1020
43 #define RoQ_SOUND_STEREO   0x1021
44
45 typedef struct RoqDemuxContext {
46
47     int frame_rate;
48     int width;
49     int height;
50     int audio_channels;
51
52     int video_stream_index;
53     int audio_stream_index;
54
55     int64_t video_pts;
56     unsigned int audio_frame_count;
57
58 } RoqDemuxContext;
59
60 static int roq_probe(AVProbeData *p)
61 {
62     if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
63         (AV_RL32(&p->buf[2]) != 0xFFFFFFFF))
64         return 0;
65
66     return AVPROBE_SCORE_MAX;
67 }
68
69 static int roq_read_header(AVFormatContext *s,
70                            AVFormatParameters *ap)
71 {
72     RoqDemuxContext *roq = s->priv_data;
73     AVIOContext *pb = s->pb;
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     roq->frame_rate = 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     roq->video_stream_index = -1;
87
88     s->ctx_flags |= AVFMTCTX_NOHEADER;
89
90     return 0;
91 }
92
93 static int roq_read_packet(AVFormatContext *s,
94                            AVPacket *pkt)
95 {
96     RoqDemuxContext *roq = s->priv_data;
97     AVIOContext *pb = s->pb;
98     int ret = 0;
99     unsigned int chunk_size;
100     unsigned int chunk_type;
101     unsigned int codebook_size;
102     unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
103     int packet_read = 0;
104     int64_t codebook_offset;
105
106     while (!packet_read) {
107
108         if (s->pb->eof_reached)
109             return AVERROR(EIO);
110
111         /* get the next chunk preamble */
112         if ((ret = avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
113             RoQ_CHUNK_PREAMBLE_SIZE)
114             return AVERROR(EIO);
115
116         chunk_type = AV_RL16(&preamble[0]);
117         chunk_size = AV_RL32(&preamble[2]);
118         if(chunk_size > INT_MAX)
119             return AVERROR_INVALIDDATA;
120
121         switch (chunk_type) {
122
123         case RoQ_INFO:
124             if (roq->video_stream_index == -1) {
125                 AVStream *st = avformat_new_stream(s, NULL);
126                 if (!st)
127                     return AVERROR(ENOMEM);
128                 avpriv_set_pts_info(st, 63, 1, roq->frame_rate);
129                 roq->video_stream_index = st->index;
130                 st->codec->codec_type   = AVMEDIA_TYPE_VIDEO;
131                 st->codec->codec_id     = CODEC_ID_ROQ;
132                 st->codec->codec_tag    = 0;  /* no fourcc */
133
134                 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE)
135                     return AVERROR(EIO);
136                 st->codec->width  = roq->width  = AV_RL16(preamble);
137                 st->codec->height = roq->height = AV_RL16(preamble + 2);
138                 break;
139             }
140             /* don't care about this chunk anymore */
141             avio_skip(pb, RoQ_CHUNK_PREAMBLE_SIZE);
142             break;
143
144         case RoQ_QUAD_CODEBOOK:
145             /* packet needs to contain both this codebook and next VQ chunk */
146             codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
147             codebook_size = chunk_size;
148             avio_skip(pb, codebook_size);
149             if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
150                 RoQ_CHUNK_PREAMBLE_SIZE)
151                 return AVERROR(EIO);
152             chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
153                 codebook_size;
154
155             /* rewind */
156             avio_seek(pb, codebook_offset, SEEK_SET);
157
158             /* load up the packet */
159             ret= av_get_packet(pb, pkt, chunk_size);
160             if (ret != chunk_size)
161                 return AVERROR(EIO);
162             pkt->stream_index = roq->video_stream_index;
163             pkt->pts = roq->video_pts++;
164
165             packet_read = 1;
166             break;
167
168         case RoQ_SOUND_MONO:
169         case RoQ_SOUND_STEREO:
170             if (roq->audio_stream_index == -1) {
171                 AVStream *st = avformat_new_stream(s, NULL);
172                 if (!st)
173                     return AVERROR(ENOMEM);
174                 avpriv_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE);
175                 roq->audio_stream_index = st->index;
176                 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
177                 st->codec->codec_id = CODEC_ID_ROQ_DPCM;
178                 st->codec->codec_tag = 0;  /* no tag */
179                 st->codec->channels = roq->audio_channels = chunk_type == RoQ_SOUND_STEREO ? 2 : 1;
180                 st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
181                 st->codec->bits_per_coded_sample = 16;
182                 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
183                     st->codec->bits_per_coded_sample;
184                 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
185             }
186         case RoQ_QUAD_VQ:
187             /* load up the packet */
188             if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
189                 return AVERROR(EIO);
190             /* copy over preamble */
191             memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
192
193             if (chunk_type == RoQ_QUAD_VQ) {
194                 pkt->stream_index = roq->video_stream_index;
195                 pkt->pts = roq->video_pts++;
196             } else {
197                 pkt->stream_index = roq->audio_stream_index;
198                 pkt->pts = roq->audio_frame_count;
199                 roq->audio_frame_count += (chunk_size / roq->audio_channels);
200             }
201
202             pkt->pos= avio_tell(pb);
203             ret = avio_read(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
204                 chunk_size);
205             if (ret != chunk_size)
206                 ret = AVERROR(EIO);
207
208             packet_read = 1;
209             break;
210
211         default:
212             av_log(s, AV_LOG_ERROR, "  unknown RoQ chunk (%04X)\n", chunk_type);
213             return AVERROR_INVALIDDATA;
214         }
215     }
216
217     return ret;
218 }
219
220 AVInputFormat ff_roq_demuxer = {
221     .name           = "RoQ",
222     .long_name      = NULL_IF_CONFIG_SMALL("id RoQ format"),
223     .priv_data_size = sizeof(RoqDemuxContext),
224     .read_probe     = roq_probe,
225     .read_header    = roq_read_header,
226     .read_packet    = roq_read_packet,
227 };