FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/idroqdec.c
Date: 2022-12-09 07:38:14
Exec Total Coverage
Lines: 95 111 85.6%
Functions: 3 3 100.0%
Branches: 34 49 69.4%

Line Branch Exec Source
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 6782 static int roq_probe(const AVProbeData *p)
63 {
64
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6782 if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
65
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7 (AV_RL32(&p->buf[2]) != 0xFFFFFFFF))
66 6775 return 0;
67
68 7 return AVPROBE_SCORE_MAX;
69 }
70
71 7 static int roq_read_header(AVFormatContext *s)
72 {
73 7 RoqDemuxContext *roq = s->priv_data;
74 7 AVIOContext *pb = s->pb;
75 unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
76
77 /* get the main header */
78
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7 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
79 RoQ_CHUNK_PREAMBLE_SIZE)
80 return AVERROR(EIO);
81 7 roq->frame_rate = AV_RL16(&preamble[6]);
82
83 /* init private context parameters */
84 7 roq->width = roq->height = roq->audio_channels = roq->video_pts =
85 7 roq->audio_frame_count = 0;
86 7 roq->audio_stream_index = -1;
87 7 roq->video_stream_index = -1;
88
89 7 s->ctx_flags |= AVFMTCTX_NOHEADER;
90
91 7 return 0;
92 }
93
94 1113 static int roq_read_packet(AVFormatContext *s,
95 AVPacket *pkt)
96 {
97 1113 RoqDemuxContext *roq = s->priv_data;
98 1113 AVIOContext *pb = s->pb;
99 1113 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 1113 int packet_read = 0;
105 int64_t codebook_offset;
106
107
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2222 while (!packet_read) {
108
109
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1145 if (avio_feof(s->pb))
110 3 return AVERROR(EIO);
111
112 /* get the next chunk preamble */
113
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1142 if ((ret = avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
114 RoQ_CHUNK_PREAMBLE_SIZE)
115 33 return AVERROR(EIO);
116
117 1109 chunk_type = AV_RL16(&preamble[0]);
118 1109 chunk_size = AV_RL32(&preamble[2]);
119
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1109 if(chunk_size > INT_MAX)
120 return AVERROR_INVALIDDATA;
121
122 1109 chunk_size = ffio_limit(pb, chunk_size);
123
124
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1109 switch (chunk_type) {
125
126 32 case RoQ_INFO:
127
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32 if (roq->video_stream_index == -1) {
128 6 AVStream *st = avformat_new_stream(s, NULL);
129
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6 if (!st)
130 return AVERROR(ENOMEM);
131 6 avpriv_set_pts_info(st, 63, 1, roq->frame_rate);
132 6 roq->video_stream_index = st->index;
133 6 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
134 6 st->codecpar->codec_id = AV_CODEC_ID_ROQ;
135 6 st->codecpar->codec_tag = 0; /* no fourcc */
136
137
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6 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE)
138 return AVERROR(EIO);
139 6 st->codecpar->width = roq->width = AV_RL16(preamble);
140 6 st->codecpar->height = roq->height = AV_RL16(preamble + 2);
141 6 break;
142 }
143 /* don't care about this chunk anymore */
144 26 avio_skip(pb, RoQ_CHUNK_PREAMBLE_SIZE);
145 26 break;
146
147 526 case RoQ_QUAD_CODEBOOK:
148
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526 if (roq->video_stream_index < 0)
149 return AVERROR_INVALIDDATA;
150 /* packet needs to contain both this codebook and next VQ chunk */
151 526 codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
152 526 codebook_size = chunk_size;
153 526 avio_skip(pb, codebook_size);
154
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526 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
155 RoQ_CHUNK_PREAMBLE_SIZE)
156 return AVERROR(EIO);
157 526 chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
158 codebook_size;
159
160
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526 if (chunk_size > INT_MAX)
161 return AVERROR_INVALIDDATA;
162
163 /* rewind */
164 526 avio_seek(pb, codebook_offset, SEEK_SET);
165
166 /* load up the packet */
167 526 ret= av_get_packet(pb, pkt, chunk_size);
168
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526 if (ret != chunk_size)
169 return AVERROR(EIO);
170 526 pkt->stream_index = roq->video_stream_index;
171 526 pkt->pts = roq->video_pts++;
172
173 526 packet_read = 1;
174 526 break;
175
176 507 case RoQ_SOUND_MONO:
177 case RoQ_SOUND_STEREO:
178
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507 if (roq->audio_stream_index == -1) {
179 3 AVStream *st = avformat_new_stream(s, NULL);
180
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3 if (!st)
181 return AVERROR(ENOMEM);
182 3 avpriv_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE);
183 3 roq->audio_stream_index = st->index;
184 3 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
185 3 st->codecpar->codec_id = AV_CODEC_ID_ROQ_DPCM;
186 3 st->codecpar->codec_tag = 0; /* no tag */
187
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3 if (chunk_type == RoQ_SOUND_STEREO) {
188 3 st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
189 } else {
190 st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
191 }
192 3 roq->audio_channels = st->codecpar->ch_layout.nb_channels;
193 3 st->codecpar->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
194 3 st->codecpar->bits_per_coded_sample = 16;
195 3 st->codecpar->bit_rate = roq->audio_channels * st->codecpar->sample_rate *
196 3 st->codecpar->bits_per_coded_sample;
197 3 st->codecpar->block_align = roq->audio_channels * st->codecpar->bits_per_coded_sample;
198 }
199 case RoQ_QUAD_VQ:
200
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551 if (chunk_type == RoQ_QUAD_VQ) {
201
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44 if (roq->video_stream_index < 0)
202 return AVERROR_INVALIDDATA;
203 }
204
205 /* load up the packet */
206 551 ret = av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE);
207
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551 if (ret < 0)
208 return ret;
209 /* copy over preamble */
210 551 memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
211
212
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551 if (chunk_type == RoQ_QUAD_VQ) {
213 44 pkt->stream_index = roq->video_stream_index;
214 44 pkt->pts = roq->video_pts++;
215 } else {
216 507 pkt->stream_index = roq->audio_stream_index;
217 507 pkt->pts = roq->audio_frame_count;
218 507 roq->audio_frame_count += (chunk_size / roq->audio_channels);
219 }
220
221 551 pkt->pos= avio_tell(pb);
222 551 ret = avio_read(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
223 chunk_size);
224
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551 if (ret != chunk_size) {
225 return AVERROR(EIO);
226 }
227
228 551 packet_read = 1;
229 551 break;
230
231 default:
232 av_log(s, AV_LOG_ERROR, " unknown RoQ chunk (%04X)\n", chunk_type);
233 return AVERROR_INVALIDDATA;
234 }
235 }
236
237 1077 return ret;
238 }
239
240 const AVInputFormat ff_roq_demuxer = {
241 .name = "roq",
242 .long_name = NULL_IF_CONFIG_SMALL("id RoQ"),
243 .priv_data_size = sizeof(RoqDemuxContext),
244 .read_probe = roq_probe,
245 .read_header = roq_read_header,
246 .read_packet = roq_read_packet,
247 };
248