2 * id RoQ (.roq) File Demuxer
3 * Copyright (c) 2003 The ffmpeg Project
5 * This file is part of FFmpeg.
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.
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.
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
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/
30 #include "libavutil/intreadwrite.h"
33 #include "avio_internal.h"
35 #define RoQ_MAGIC_NUMBER 0x1084
36 #define RoQ_CHUNK_PREAMBLE_SIZE 8
37 #define RoQ_AUDIO_SAMPLE_RATE 22050
38 #define RoQ_CHUNKS_TO_SCAN 30
40 #define RoQ_INFO 0x1001
41 #define RoQ_QUAD_CODEBOOK 0x1002
42 #define RoQ_QUAD_VQ 0x1011
43 #define RoQ_SOUND_MONO 0x1020
44 #define RoQ_SOUND_STEREO 0x1021
46 typedef struct RoqDemuxContext {
53 int video_stream_index;
54 int audio_stream_index;
57 unsigned int audio_frame_count;
61 static int roq_probe(AVProbeData *p)
63 if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
64 (AV_RL32(&p->buf[2]) != 0xFFFFFFFF))
67 return AVPROBE_SCORE_MAX;
70 static int roq_read_header(AVFormatContext *s)
72 RoqDemuxContext *roq = s->priv_data;
73 AVIOContext *pb = s->pb;
74 unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
76 /* get the main header */
77 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
78 RoQ_CHUNK_PREAMBLE_SIZE)
80 roq->frame_rate = AV_RL16(&preamble[6]);
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;
88 s->ctx_flags |= AVFMTCTX_NOHEADER;
93 static int roq_read_packet(AVFormatContext *s,
96 RoqDemuxContext *roq = s->priv_data;
97 AVIOContext *pb = s->pb;
99 unsigned int chunk_size;
100 unsigned int chunk_type;
101 unsigned int codebook_size;
102 unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
104 int64_t codebook_offset;
106 while (!packet_read) {
111 /* get the next chunk preamble */
112 if ((ret = avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
113 RoQ_CHUNK_PREAMBLE_SIZE)
116 chunk_type = AV_RL16(&preamble[0]);
117 chunk_size = AV_RL32(&preamble[2]);
118 if(chunk_size > INT_MAX)
119 return AVERROR_INVALIDDATA;
121 chunk_size = ffio_limit(pb, chunk_size);
123 switch (chunk_type) {
126 if (roq->video_stream_index == -1) {
127 AVStream *st = avformat_new_stream(s, NULL);
129 return AVERROR(ENOMEM);
130 avpriv_set_pts_info(st, 63, 1, roq->frame_rate);
131 roq->video_stream_index = st->index;
132 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
133 st->codec->codec_id = AV_CODEC_ID_ROQ;
134 st->codec->codec_tag = 0; /* no fourcc */
136 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE)
138 st->codec->width = roq->width = AV_RL16(preamble);
139 st->codec->height = roq->height = AV_RL16(preamble + 2);
142 /* don't care about this chunk anymore */
143 avio_skip(pb, RoQ_CHUNK_PREAMBLE_SIZE);
146 case RoQ_QUAD_CODEBOOK:
147 /* packet needs to contain both this codebook and next VQ chunk */
148 codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
149 codebook_size = chunk_size;
150 avio_skip(pb, codebook_size);
151 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
152 RoQ_CHUNK_PREAMBLE_SIZE)
154 chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
158 avio_seek(pb, codebook_offset, SEEK_SET);
160 /* load up the packet */
161 ret= av_get_packet(pb, pkt, chunk_size);
162 if (ret != chunk_size)
164 pkt->stream_index = roq->video_stream_index;
165 pkt->pts = roq->video_pts++;
171 case RoQ_SOUND_STEREO:
172 if (roq->audio_stream_index == -1) {
173 AVStream *st = avformat_new_stream(s, NULL);
175 return AVERROR(ENOMEM);
176 avpriv_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE);
177 roq->audio_stream_index = st->index;
178 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
179 st->codec->codec_id = AV_CODEC_ID_ROQ_DPCM;
180 st->codec->codec_tag = 0; /* no tag */
181 st->codec->channels = roq->audio_channels = chunk_type == RoQ_SOUND_STEREO ? 2 : 1;
182 st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
183 st->codec->bits_per_coded_sample = 16;
184 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
185 st->codec->bits_per_coded_sample;
186 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
189 /* load up the packet */
190 if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
192 /* copy over preamble */
193 memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
195 if (chunk_type == RoQ_QUAD_VQ) {
196 pkt->stream_index = roq->video_stream_index;
197 pkt->pts = roq->video_pts++;
199 pkt->stream_index = roq->audio_stream_index;
200 pkt->pts = roq->audio_frame_count;
201 roq->audio_frame_count += (chunk_size / roq->audio_channels);
204 pkt->pos= avio_tell(pb);
205 ret = avio_read(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
207 if (ret != chunk_size)
214 av_log(s, AV_LOG_ERROR, " unknown RoQ chunk (%04X)\n", chunk_type);
215 return AVERROR_INVALIDDATA;
222 AVInputFormat ff_roq_demuxer = {
224 .long_name = NULL_IF_CONFIG_SMALL("id RoQ"),
225 .priv_data_size = sizeof(RoqDemuxContext),
226 .read_probe = roq_probe,
227 .read_header = roq_read_header,
228 .read_packet = roq_read_packet,