2 * Id RoQ (.roq) File Demuxer
3 * Copyright (c) 2003 The ffmpeg Project
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * Id RoQ format file demuxer
23 * by Mike Melanson (melanson@pcisys.net)
24 * for more information on the .roq file format, visit:
25 * http://www.csse.monash.edu.au/~timf/
30 #define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
31 #define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \
32 (((uint8_t*)(x))[2] << 16) | \
33 (((uint8_t*)(x))[1] << 8) | \
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
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
47 typedef struct RoqDemuxContext {
55 int video_stream_index;
56 int audio_stream_index;
59 unsigned int audio_frame_count;
63 static int roq_probe(AVProbeData *p)
68 if ((LE_16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
69 (LE_32(&p->buf[2]) != 0xFFFFFFFF))
72 return AVPROBE_SCORE_MAX;
75 static int roq_read_header(AVFormatContext *s,
76 AVFormatParameters *ap)
78 RoqDemuxContext *roq = s->priv_data;
79 ByteIOContext *pb = &s->pb;
81 unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
83 unsigned int chunk_size;
84 unsigned int chunk_type;
86 /* get the main header */
87 if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
88 RoQ_CHUNK_PREAMBLE_SIZE)
90 roq->framerate = LE_16(&preamble[6]);
91 roq->frame_pts_inc = 90000 / roq->framerate;
93 /* set the pts reference (1 pts = 1/90000) */
97 /* init private context parameters */
98 roq->width = roq->height = roq->audio_channels = roq->video_pts =
99 roq->audio_frame_count = 0;
101 /* scan the first n chunks searching for A/V parameters */
102 for (i = 0; i < RoQ_CHUNKS_TO_SCAN; i++) {
103 if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
104 RoQ_CHUNK_PREAMBLE_SIZE)
107 chunk_type = LE_16(&preamble[0]);
108 chunk_size = LE_32(&preamble[2]);
110 switch (chunk_type) {
113 /* fetch the width and height; reuse the preamble bytes */
114 if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
115 RoQ_CHUNK_PREAMBLE_SIZE)
117 roq->width = LE_16(&preamble[0]);
118 roq->height = LE_16(&preamble[2]);
121 case RoQ_QUAD_CODEBOOK:
123 /* ignore during this scan */
124 url_fseek(pb, chunk_size, SEEK_CUR);
128 roq->audio_channels = 1;
129 url_fseek(pb, chunk_size, SEEK_CUR);
132 case RoQ_SOUND_STEREO:
133 roq->audio_channels = 2;
134 url_fseek(pb, chunk_size, SEEK_CUR);
138 printf (" unknown RoQ chunk type (%04X)\n", LE_16(&preamble[0]));
139 return AVERROR_INVALIDDATA;
143 /* if all necessary parameters have been gathered, exit early */
144 if ((roq->width && roq->height) && roq->audio_channels)
148 /* seek back to the first chunk */
149 url_fseek(pb, RoQ_CHUNK_PREAMBLE_SIZE, SEEK_SET);
151 /* initialize the decoders */
152 st = av_new_stream(s, 0);
154 return AVERROR_NOMEM;
155 roq->video_stream_index = st->index;
156 st->codec.codec_type = CODEC_TYPE_VIDEO;
157 st->codec.codec_id = CODEC_ID_ROQ;
158 st->codec.codec_tag = 0; /* no fourcc */
159 st->codec.width = roq->width;
160 st->codec.height = roq->height;
162 if (roq->audio_channels) {
163 st = av_new_stream(s, 0);
165 return AVERROR_NOMEM;
166 roq->audio_stream_index = st->index;
167 st->codec.codec_type = CODEC_TYPE_AUDIO;
168 st->codec.codec_id = CODEC_ID_ROQ_DPCM;
169 st->codec.codec_tag = 0; /* no tag */
170 st->codec.channels = roq->audio_channels;
171 st->codec.sample_rate = RoQ_AUDIO_SAMPLE_RATE;
172 st->codec.bits_per_sample = 16;
173 st->codec.bit_rate = st->codec.channels * st->codec.sample_rate *
174 st->codec.bits_per_sample;
175 st->codec.block_align = st->codec.channels * st->codec.bits_per_sample;
181 static int roq_read_packet(AVFormatContext *s,
184 RoqDemuxContext *roq = s->priv_data;
185 ByteIOContext *pb = &s->pb;
187 unsigned int chunk_size;
188 unsigned int chunk_type;
189 unsigned int codebook_size;
190 unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
192 offset_t codebook_offset;
194 while (!packet_read) {
196 if (url_feof(&s->pb))
199 /* get the next chunk preamble */
200 if ((ret = get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
201 RoQ_CHUNK_PREAMBLE_SIZE)
204 chunk_type = LE_16(&preamble[0]);
205 chunk_size = LE_32(&preamble[2]);
207 switch (chunk_type) {
210 /* don't care about this chunk anymore */
211 url_fseek(pb, RoQ_CHUNK_PREAMBLE_SIZE, SEEK_CUR);
214 case RoQ_QUAD_CODEBOOK:
215 /* packet needs to contain both this codebook and next VQ chunk */
216 codebook_offset = url_ftell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
217 codebook_size = chunk_size;
218 url_fseek(pb, codebook_size, SEEK_CUR);
219 if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
220 RoQ_CHUNK_PREAMBLE_SIZE)
222 chunk_size = LE_32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
226 url_fseek(pb, codebook_offset, SEEK_SET);
228 /* load up the packet */
229 if (av_new_packet(pkt, chunk_size))
231 pkt->stream_index = roq->video_stream_index;
232 pkt->pts = roq->video_pts;
233 ret = get_buffer(pb, pkt->data, chunk_size);
234 if (ret != chunk_size)
237 roq->video_pts += roq->frame_pts_inc;
242 case RoQ_SOUND_STEREO:
244 /* load up the packet */
245 if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
247 /* copy over preamble */
248 memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
250 if (chunk_type == RoQ_QUAD_VQ) {
251 pkt->stream_index = roq->video_stream_index;
252 pkt->pts = roq->video_pts;
253 roq->video_pts += roq->frame_pts_inc;
255 pkt->stream_index = roq->audio_stream_index;
256 pkt->pts = roq->audio_frame_count;
258 pkt->pts /= RoQ_AUDIO_SAMPLE_RATE;
259 roq->audio_frame_count += (chunk_size / roq->audio_channels);
262 ret = get_buffer(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
264 if (ret != chunk_size)
271 printf (" unknown RoQ chunk (%04X)\n", chunk_type);
272 return AVERROR_INVALIDDATA;
280 static int roq_read_close(AVFormatContext *s)
282 // RoqDemuxContext *roq = (RoqDemuxContext *)s->priv_data;
287 static AVInputFormat roq_iformat = {
290 sizeof(RoqDemuxContext),
299 av_register_input_format(&roq_iformat);