FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/idroqdec.c
Date: 2024-11-20 23:03:26
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 "demux.h"
34 #include "internal.h"
35 #include "avio_internal.h"
36
37 #define RoQ_MAGIC_NUMBER 0x1084
38 #define RoQ_CHUNK_PREAMBLE_SIZE 8
39 #define RoQ_AUDIO_SAMPLE_RATE 22050
40 #define RoQ_CHUNKS_TO_SCAN 30
41
42 #define RoQ_INFO 0x1001
43 #define RoQ_QUAD_CODEBOOK 0x1002
44 #define RoQ_QUAD_VQ 0x1011
45 #define RoQ_SOUND_MONO 0x1020
46 #define RoQ_SOUND_STEREO 0x1021
47
48 typedef struct RoqDemuxContext {
49
50 int frame_rate;
51 int width;
52 int height;
53 int audio_channels;
54
55 int video_stream_index;
56 int audio_stream_index;
57
58 int64_t video_pts;
59 unsigned int audio_frame_count;
60
61 } RoqDemuxContext;
62
63 7186 static int roq_probe(const AVProbeData *p)
64 {
65
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 7186 if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
66
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 7 (AV_RL32(&p->buf[2]) != 0xFFFFFFFF))
67 7179 return 0;
68
69 7 return AVPROBE_SCORE_MAX;
70 }
71
72 7 static int roq_read_header(AVFormatContext *s)
73 {
74 7 RoqDemuxContext *roq = s->priv_data;
75 7 AVIOContext *pb = s->pb;
76 unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
77
78 /* get the main header */
79
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 7 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
80 RoQ_CHUNK_PREAMBLE_SIZE)
81 ✗ return AVERROR(EIO);
82 7 roq->frame_rate = AV_RL16(&preamble[6]);
83
84 /* init private context parameters */
85 7 roq->width = roq->height = roq->audio_channels = roq->video_pts =
86 7 roq->audio_frame_count = 0;
87 7 roq->audio_stream_index = -1;
88 7 roq->video_stream_index = -1;
89
90 7 s->ctx_flags |= AVFMTCTX_NOHEADER;
91
92 7 return 0;
93 }
94
95 1113 static int roq_read_packet(AVFormatContext *s,
96 AVPacket *pkt)
97 {
98 1113 RoqDemuxContext *roq = s->priv_data;
99 1113 AVIOContext *pb = s->pb;
100 1113 int ret = 0;
101 unsigned int chunk_size;
102 unsigned int chunk_type;
103 unsigned int codebook_size;
104 unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
105 1113 int packet_read = 0;
106 int64_t codebook_offset;
107
108
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 2222 while (!packet_read) {
109
110
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 1145 if (avio_feof(s->pb))
111 3 return AVERROR_EOF;
112
113 /* get the next chunk preamble */
114
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 1142 if ((ret = avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
115 RoQ_CHUNK_PREAMBLE_SIZE)
116 33 return AVERROR(EIO);
117
118 1109 chunk_type = AV_RL16(&preamble[0]);
119 1109 chunk_size = AV_RL32(&preamble[2]);
120
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 1109 if(chunk_size > INT_MAX)
121 ✗ return AVERROR_INVALIDDATA;
122
123 1109 chunk_size = ffio_limit(pb, chunk_size);
124
125
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 1109 switch (chunk_type) {
126
127 32 case RoQ_INFO:
128
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 32 if (roq->video_stream_index == -1) {
129 6 AVStream *st = avformat_new_stream(s, NULL);
130
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 6 if (!st)
131 ✗ return AVERROR(ENOMEM);
132 6 avpriv_set_pts_info(st, 63, 1, roq->frame_rate);
133 6 roq->video_stream_index = st->index;
134 6 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
135 6 st->codecpar->codec_id = AV_CODEC_ID_ROQ;
136 6 st->codecpar->codec_tag = 0; /* no fourcc */
137
138
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 6 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE)
139 ✗ return AVERROR(EIO);
140 6 st->codecpar->width = roq->width = AV_RL16(preamble);
141 6 st->codecpar->height = roq->height = AV_RL16(preamble + 2);
142 6 break;
143 }
144 /* don't care about this chunk anymore */
145 26 avio_skip(pb, RoQ_CHUNK_PREAMBLE_SIZE);
146 26 break;
147
148 526 case RoQ_QUAD_CODEBOOK:
149
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 526 if (roq->video_stream_index < 0)
150 ✗ return AVERROR_INVALIDDATA;
151 /* packet needs to contain both this codebook and next VQ chunk */
152 526 codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
153 526 codebook_size = chunk_size;
154 526 avio_skip(pb, codebook_size);
155
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 526 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
156 RoQ_CHUNK_PREAMBLE_SIZE)
157 ✗ return AVERROR(EIO);
158 526 chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
159 codebook_size;
160
161
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 526 if (chunk_size > INT_MAX)
162 ✗ return AVERROR_INVALIDDATA;
163
164 /* rewind */
165 526 avio_seek(pb, codebook_offset, SEEK_SET);
166
167 /* load up the packet */
168 526 ret= av_get_packet(pb, pkt, chunk_size);
169
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 526 if (ret != chunk_size)
170 ✗ return AVERROR(EIO);
171 526 pkt->stream_index = roq->video_stream_index;
172 526 pkt->pts = roq->video_pts++;
173
174 526 packet_read = 1;
175 526 break;
176
177 507 case RoQ_SOUND_MONO:
178 case RoQ_SOUND_STEREO:
179
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 507 if (roq->audio_stream_index == -1) {
180 3 AVStream *st = avformat_new_stream(s, NULL);
181
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 3 if (!st)
182 ✗ return AVERROR(ENOMEM);
183 3 avpriv_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE);
184 3 roq->audio_stream_index = st->index;
185 3 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
186 3 st->codecpar->codec_id = AV_CODEC_ID_ROQ_DPCM;
187 3 st->codecpar->codec_tag = 0; /* no tag */
188
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 3 if (chunk_type == RoQ_SOUND_STEREO) {
189 3 st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
190 } else {
191 ✗ st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
192 }
193 3 roq->audio_channels = st->codecpar->ch_layout.nb_channels;
194 3 st->codecpar->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
195 3 st->codecpar->bits_per_coded_sample = 16;
196 3 st->codecpar->bit_rate = roq->audio_channels * st->codecpar->sample_rate *
197 3 st->codecpar->bits_per_coded_sample;
198 3 st->codecpar->block_align = roq->audio_channels * st->codecpar->bits_per_coded_sample;
199 }
200 case RoQ_QUAD_VQ:
201
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 551 if (chunk_type == RoQ_QUAD_VQ) {
202
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 44 if (roq->video_stream_index < 0)
203 ✗ return AVERROR_INVALIDDATA;
204 }
205
206 /* load up the packet */
207 551 ret = av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE);
208
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 551 if (ret < 0)
209 ✗ return ret;
210 /* copy over preamble */
211 551 memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
212
213
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 551 if (chunk_type == RoQ_QUAD_VQ) {
214 44 pkt->stream_index = roq->video_stream_index;
215 44 pkt->pts = roq->video_pts++;
216 } else {
217 507 pkt->stream_index = roq->audio_stream_index;
218 507 pkt->pts = roq->audio_frame_count;
219 507 roq->audio_frame_count += (chunk_size / roq->audio_channels);
220 }
221
222 551 pkt->pos= avio_tell(pb);
223 551 ret = avio_read(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
224 chunk_size);
225
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 551 if (ret != chunk_size) {
226 ✗ return AVERROR(EIO);
227 }
228
229 551 packet_read = 1;
230 551 break;
231
232 ✗ default:
233 ✗ av_log(s, AV_LOG_ERROR, " unknown RoQ chunk (%04X)\n", chunk_type);
234 ✗ return AVERROR_INVALIDDATA;
235 }
236 }
237
238 1077 return ret;
239 }
240
241 const FFInputFormat ff_roq_demuxer = {
242 .p.name = "roq",
243 .p.long_name = NULL_IF_CONFIG_SMALL("id RoQ"),
244 .priv_data_size = sizeof(RoqDemuxContext),
245 .read_probe = roq_probe,
246 .read_header = roq_read_header,
247 .read_packet = roq_read_packet,
248 };
249