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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 | }; |