FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/cdxl.c
Date: 2024-09-07 18:49:03
Exec Total Coverage
Lines: 113 137 82.5%
Functions: 3 4 75.0%
Branches: 78 118 66.1%
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1 /*
2 * CDXL demuxer
3 * Copyright (c) 2011-2012 Paul B Mahol
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 #include "libavutil/channel_layout.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/parseutils.h"
25 #include "libavutil/opt.h"
26 #include "avformat.h"
27 #include "demux.h"
28 #include "internal.h"
29
30 #define CDXL_HEADER_SIZE 32
31
32 typedef struct CDXLDemuxContext {
33 AVClass *class;
34 int read_chunk;
35 AVRational frate;
36 int srate;
37 AVRational frame_rate;
38 int sample_rate;
39 uint8_t header[CDXL_HEADER_SIZE];
40 int video_stream_index;
41 int audio_stream_index;
42 int64_t filesize;
43 int64_t pos;
44 } CDXLDemuxContext;
45
46 7162 static int cdxl_read_probe(const AVProbeData *p)
47 {
48 7162 int score = AVPROBE_SCORE_EXTENSION + 10;
49 7162 const uint8_t *buf = p->buf;
50
51
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 7162 if (p->buf_size < CDXL_HEADER_SIZE)
52 ✗ return 0;
53
54 /* check type */
55
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 7162 if (buf[0] > 1)
56 5720 return 0;
57
58 /* reserved bytes should always be set to 0 */
59
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 1442 if (AV_RL24(&buf[29]))
60 1196 return 0;
61
62 /* check palette size */
63
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 246 if (!AV_RN16(&buf[20]))
64 81 return 0;
65
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 165 if (buf[0] == 1 && AV_RB16(&buf[20]) > 512)
66 ✗ return 0;
67
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 165 if (buf[0] == 0 && AV_RB16(&buf[20]) > 768)
68 21 return 0;
69
70
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 144 if (!AV_RN16(&buf[22]) && AV_RN16(&buf[24]))
71 ✗ return 0;
72
73
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 144 if (buf[0] == 0 && (!buf[26] || !AV_RB16(&buf[24])))
74 ✗ return 0;
75
76 /* check number of planes */
77
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 144 if (buf[19] != 6 && buf[19] != 8 && buf[19] != 24)
78 139 return 0;
79
80
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 5 if (buf[18])
81 ✗ return 0;
82
83 /* check widh and height */
84
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 5 if (AV_RB16(&buf[14]) > 640 || AV_RB16(&buf[16]) > 480 ||
85
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 5 AV_RB16(&buf[14]) == 0 || AV_RB16(&buf[16]) == 0)
86 ✗ return 0;
87
88 /* chunk size */
89
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 5 if (AV_RB32(&buf[2]) <= AV_RB16(&buf[20]) + AV_RB16(&buf[22]) * (1 + !!(buf[1] & 0x10)) + CDXL_HEADER_SIZE)
90 ✗ return 0;
91
92 /* previous chunk size */
93
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 5 if (AV_RN32(&buf[6]))
94 ✗ score /= 2;
95
96 /* current frame number, usually starts from 1 */
97
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 5 if (AV_RB32(&buf[10]) != 1)
98 1 score /= 2;
99
100 5 return score;
101 }
102
103 6 static int cdxl_read_header(AVFormatContext *s)
104 {
105 6 CDXLDemuxContext *cdxl = s->priv_data;
106
107 6 cdxl->read_chunk = 0;
108 6 cdxl->video_stream_index = -1;
109 6 cdxl->audio_stream_index = -1;
110
111 6 cdxl->filesize = avio_size(s->pb);
112
113 6 s->ctx_flags |= AVFMTCTX_NOHEADER;
114
115 6 return 0;
116 }
117
118 198 static int cdxl_read_packet(AVFormatContext *s, AVPacket *pkt)
119 {
120 198 CDXLDemuxContext *cdxl = s->priv_data;
121 198 AVIOContext *pb = s->pb;
122 uint32_t current_size, video_size, image_size;
123 uint16_t audio_size, palette_size, width, height;
124 int channels, type, format, ret;
125
126
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 198 if (avio_feof(pb))
127 11 return AVERROR_EOF;
128
129
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 187 if (!cdxl->read_chunk) {
130 107 cdxl->pos = avio_tell(pb);
131
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 107 if (avio_read(pb, cdxl->header, CDXL_HEADER_SIZE) != CDXL_HEADER_SIZE)
132 1 return AVERROR_EOF;
133 }
134
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 186 if (cdxl->header[0] > 1) {
135 ✗ av_log(s, AV_LOG_ERROR, "unsupported cdxl file\n");
136 ✗ return AVERROR_INVALIDDATA;
137 }
138
139 186 type = cdxl->header[0];
140
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 186 channels = 1 + !!(cdxl->header[1] & 0x10);
141 186 format = cdxl->header[1] & 0xE0;
142 186 current_size = AV_RB32(&cdxl->header[2]);
143 186 width = AV_RB16(&cdxl->header[14]);
144 186 height = AV_RB16(&cdxl->header[16]);
145 186 palette_size = AV_RB16(&cdxl->header[20]);
146 186 audio_size = AV_RB16(&cdxl->header[22]) * channels;
147 186 cdxl->srate = AV_RB16(&cdxl->header[24]);
148
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 186 if (!cdxl->srate && audio_size)
149 164 cdxl->srate = cdxl->sample_rate;
150 186 cdxl->frate.num = cdxl->header[26];
151 186 cdxl->frate.den = 1;
152
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 186 if (cdxl->header[19] == 0 ||
153
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 186 FFALIGN(width, 16) * (uint64_t)height * cdxl->header[19] > INT_MAX)
154 ✗ return AVERROR_INVALIDDATA;
155
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 186 if (format == 0x20)
156 ✗ image_size = width * height * cdxl->header[19] / 8;
157 else
158 186 image_size = FFALIGN(width, 16) * height * cdxl->header[19] / 8;
159 186 video_size = palette_size + image_size;
160
161
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 186 if ((type == 1 && palette_size > 512) ||
162 ✗ (type == 0 && palette_size > 768))
163 ✗ return AVERROR_INVALIDDATA;
164
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 186 if (current_size < (uint64_t)audio_size + video_size + CDXL_HEADER_SIZE)
165 ✗ return AVERROR_INVALIDDATA;
166
167
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 186 if (!cdxl->frate.num && audio_size && cdxl->srate > 0) {
168 164 cdxl->frate = (AVRational){ cdxl->srate, audio_size };
169
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 22 } else if (!cdxl->frate.num) {
170 22 cdxl->frate = cdxl->frame_rate;
171 }
172
173
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 186 if (cdxl->read_chunk && audio_size) {
174
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 80 if (cdxl->audio_stream_index == -1) {
175 4 AVStream *st = avformat_new_stream(s, NULL);
176
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 4 if (!st)
177 ✗ return AVERROR(ENOMEM);
178
179 4 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
180 4 st->codecpar->codec_tag = 0;
181 4 st->codecpar->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;
182 4 av_channel_layout_default(&st->codecpar->ch_layout, channels);
183 4 st->codecpar->sample_rate= cdxl->srate;
184 4 st->start_time = 0;
185 4 cdxl->audio_stream_index = st->index;
186 4 avpriv_set_pts_info(st, 64, 1, cdxl->srate);
187
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 4 if (current_size && cdxl->filesize > 0 && audio_size > 0)
188 4 st->duration = (cdxl->filesize / current_size) * audio_size / channels;
189 }
190
191 80 ret = av_get_packet(pb, pkt, audio_size);
192
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 80 if (ret < 0)
193 ✗ return ret;
194 80 pkt->stream_index = cdxl->audio_stream_index;
195 80 pkt->pos = cdxl->pos;
196 80 pkt->duration = audio_size / channels;
197 80 cdxl->read_chunk = 0;
198 } else {
199
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 106 if (cdxl->video_stream_index == -1) {
200 6 AVStream *st = avformat_new_stream(s, NULL);
201
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 6 if (!st)
202 ✗ return AVERROR(ENOMEM);
203
204 6 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
205 6 st->codecpar->codec_tag = 0;
206 6 st->codecpar->codec_id = AV_CODEC_ID_CDXL;
207 6 st->codecpar->width = width;
208 6 st->codecpar->height = height;
209
210
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 6 if (current_size && cdxl->filesize > 0)
211 6 st->nb_frames = cdxl->filesize / current_size;
212 6 st->start_time = 0;
213 6 cdxl->video_stream_index = st->index;
214 6 avpriv_set_pts_info(st, 64, cdxl->frate.den, cdxl->frate.num);
215 }
216
217
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 106 if ((ret = av_new_packet(pkt, video_size + CDXL_HEADER_SIZE)) < 0)
218 ✗ return ret;
219 106 memcpy(pkt->data, cdxl->header, CDXL_HEADER_SIZE);
220 106 ret = avio_read(pb, pkt->data + CDXL_HEADER_SIZE, video_size);
221
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 106 if (ret < 0) {
222 ✗ return ret;
223 }
224 106 av_shrink_packet(pkt, CDXL_HEADER_SIZE + ret);
225 106 pkt->stream_index = cdxl->video_stream_index;
226 106 pkt->flags |= AV_PKT_FLAG_KEY;
227 106 pkt->pos = cdxl->pos;
228 106 pkt->duration = 1;
229 106 cdxl->read_chunk = audio_size;
230 }
231
232
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 186 if (!cdxl->read_chunk)
233 102 avio_skip(pb, current_size - audio_size - video_size - CDXL_HEADER_SIZE);
234 186 return ret;
235 }
236
237 ✗ static int read_seek(AVFormatContext *s, int stream_index,
238 int64_t timestamp, int flags)
239 {
240 ✗ CDXLDemuxContext *cdxl = s->priv_data;
241
242 ✗ cdxl->read_chunk = 0;
243
244 ✗ return -1;
245 }
246
247 #define OFFSET(x) offsetof(CDXLDemuxContext, x)
248 static const AVOption cdxl_options[] = {
249 { "sample_rate", "", OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64=11025 }, 8000, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
250 { "frame_rate", "", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, { .str="15" }, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
251 { NULL },
252 };
253
254 static const AVClass cdxl_demuxer_class = {
255 .class_name = "CDXL demuxer",
256 .item_name = av_default_item_name,
257 .option = cdxl_options,
258 .version = LIBAVUTIL_VERSION_INT,
259 };
260
261 const FFInputFormat ff_cdxl_demuxer = {
262 .p.name = "cdxl",
263 .p.long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
264 .p.priv_class = &cdxl_demuxer_class,
265 .p.extensions = "cdxl,xl",
266 .p.flags = AVFMT_GENERIC_INDEX,
267 .priv_data_size = sizeof(CDXLDemuxContext),
268 .read_probe = cdxl_read_probe,
269 .read_header = cdxl_read_header,
270 .read_packet = cdxl_read_packet,
271 .read_seek = read_seek,
272 };
273