FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/dsicin.c
Date: 2026-04-24 19:58:39
Exec Total Coverage
Lines: 94 110 85.5%
Functions: 5 5 100.0%
Branches: 27 50 54.0%
Line Branch Exec Source
1 /*
2 * Delphine Software International CIN File Demuxer
3 * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
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 * Delphine Software International CIN file demuxer
25 */
26
27 #include "libavutil/channel_layout.h"
28 #include "libavutil/intreadwrite.h"
29 #include "avformat.h"
30 #include "demux.h"
31 #include "internal.h"
32 #include "avio_internal.h"
33
34
35 typedef struct CinFileHeader {
36 int video_frame_size;
37 int video_frame_width;
38 int video_frame_height;
39 int audio_frequency;
40 int audio_bits;
41 int audio_stereo;
42 int audio_frame_size;
43 } CinFileHeader;
44
45 typedef struct CinFrameHeader {
46 int audio_frame_type;
47 int video_frame_type;
48 int pal_colors_count;
49 int audio_frame_size;
50 int video_frame_size;
51 } CinFrameHeader;
52
53 typedef struct CinDemuxContext {
54 int audio_stream_index;
55 int video_stream_index;
56 CinFileHeader file_header;
57 int64_t audio_stream_pts;
58 int64_t video_stream_pts;
59 CinFrameHeader frame_header;
60 int audio_buffer_size;
61 } CinDemuxContext;
62
63
64 7480 static int cin_probe(const AVProbeData *p)
65 {
66 /* header starts with this special marker */
67
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 7480 if (AV_RL32(&p->buf[0]) != 0x55AA0000)
68 7478 return 0;
69
70 /* for accuracy, check some header field values */
71
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 2 if (AV_RL32(&p->buf[12]) != 22050 || p->buf[16] != 16 || p->buf[17] != 0)
72 ✗ return 0;
73
74 2 return AVPROBE_SCORE_MAX;
75 }
76
77 2 static int cin_read_file_header(CinDemuxContext *cin, AVIOContext *pb) {
78 2 CinFileHeader *hdr = &cin->file_header;
79
80
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 2 if (avio_rl32(pb) != 0x55AA0000)
81 ✗ return AVERROR_INVALIDDATA;
82
83 2 hdr->video_frame_size = avio_rl32(pb);
84 2 hdr->video_frame_width = avio_rl16(pb);
85 2 hdr->video_frame_height = avio_rl16(pb);
86 2 hdr->audio_frequency = avio_rl32(pb);
87 2 hdr->audio_bits = avio_r8(pb);
88 2 hdr->audio_stereo = avio_r8(pb);
89 2 hdr->audio_frame_size = avio_rl16(pb);
90
91
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 2 if (hdr->audio_frequency != 22050 || hdr->audio_bits != 16 || hdr->audio_stereo != 0)
92 ✗ return AVERROR_INVALIDDATA;
93
94 2 return 0;
95 }
96
97 2 static int cin_read_header(AVFormatContext *s)
98 {
99 int rc;
100 2 CinDemuxContext *cin = s->priv_data;
101 2 CinFileHeader *hdr = &cin->file_header;
102 2 AVIOContext *pb = s->pb;
103 AVStream *st;
104
105 2 rc = cin_read_file_header(cin, pb);
106
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 2 if (rc)
107 ✗ return rc;
108
109 2 cin->video_stream_pts = 0;
110 2 cin->audio_stream_pts = 0;
111 2 cin->audio_buffer_size = 0;
112
113 /* initialize the video decoder stream */
114 2 st = avformat_new_stream(s, NULL);
115
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 2 if (!st)
116 ✗ return AVERROR(ENOMEM);
117
118 2 avpriv_set_pts_info(st, 32, 1, 12);
119 2 cin->video_stream_index = st->index;
120 2 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
121 2 st->codecpar->codec_id = AV_CODEC_ID_DSICINVIDEO;
122 2 st->codecpar->codec_tag = 0; /* no fourcc */
123 2 st->codecpar->width = hdr->video_frame_width;
124 2 st->codecpar->height = hdr->video_frame_height;
125
126 /* initialize the audio decoder stream */
127 2 st = avformat_new_stream(s, NULL);
128
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 2 if (!st)
129 ✗ return AVERROR(ENOMEM);
130
131 2 avpriv_set_pts_info(st, 32, 1, 22050);
132 2 cin->audio_stream_index = st->index;
133 2 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
134 2 st->codecpar->codec_id = AV_CODEC_ID_DSICINAUDIO;
135 2 st->codecpar->codec_tag = 0; /* no tag */
136 2 st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
137 2 st->codecpar->sample_rate = 22050;
138 2 st->codecpar->bits_per_coded_sample = 8;
139 2 st->codecpar->bit_rate = st->codecpar->sample_rate *
140 2 st->codecpar->bits_per_coded_sample *
141 2 st->codecpar->ch_layout.nb_channels;
142
143 2 return 0;
144 }
145
146 184 static int cin_read_frame_header(CinDemuxContext *cin, AVIOContext *pb) {
147 184 CinFrameHeader *hdr = &cin->frame_header;
148
149 184 hdr->video_frame_type = avio_r8(pb);
150 184 hdr->audio_frame_type = avio_r8(pb);
151 184 hdr->pal_colors_count = avio_rl16(pb);
152 184 hdr->video_frame_size = avio_rl32(pb);
153 184 hdr->audio_frame_size = avio_rl32(pb);
154
155
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 184 if (avio_feof(pb) || pb->error)
156 ✗ return pb->error ? pb->error : AVERROR_INVALIDDATA;
157
158
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 184 if (avio_rl32(pb) != 0xAA55AA55)
159 ✗ return AVERROR_INVALIDDATA;
160
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 184 if (hdr->video_frame_size < 0 || hdr->audio_frame_size < 0)
161 ✗ return AVERROR_INVALIDDATA;
162
163 184 return 0;
164 }
165
166 368 static int cin_read_packet(AVFormatContext *s, AVPacket *pkt)
167 {
168 368 CinDemuxContext *cin = s->priv_data;
169 368 AVIOContext *pb = s->pb;
170 368 CinFrameHeader *hdr = &cin->frame_header;
171 int rc, palette_type;
172 int64_t pkt_size;
173 int ret;
174
175
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 368 if (cin->audio_buffer_size == 0) {
176 184 rc = cin_read_frame_header(cin, pb);
177
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 184 if (rc)
178 ✗ return rc;
179
180
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 184 if ((int16_t)hdr->pal_colors_count < 0) {
181 ✗ hdr->pal_colors_count = -(int16_t)hdr->pal_colors_count;
182 ✗ palette_type = 1;
183 } else {
184 184 palette_type = 0;
185 }
186
187 /* palette and video packet */
188 184 pkt_size = (palette_type + 3LL) * hdr->pal_colors_count + hdr->video_frame_size;
189
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 184 if (pkt_size + 4 > INT_MAX)
190 ✗ return AVERROR_INVALIDDATA;
191
192 184 pkt_size = ffio_limit(pb, pkt_size);
193
194 184 ret = av_new_packet(pkt, 4 + pkt_size);
195
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 184 if (ret < 0)
196 ✗ return ret;
197
198 184 pkt->stream_index = cin->video_stream_index;
199 184 pkt->pts = cin->video_stream_pts++;
200
201 184 pkt->data[0] = palette_type;
202 184 pkt->data[1] = hdr->pal_colors_count & 0xFF;
203 184 pkt->data[2] = hdr->pal_colors_count >> 8;
204 184 pkt->data[3] = hdr->video_frame_type;
205
206 184 ret = avio_read(pb, &pkt->data[4], pkt_size);
207
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 184 if (ret < 0) {
208 ✗ return ret;
209 }
210
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 184 if (ret < pkt_size)
211 ✗ av_shrink_packet(pkt, 4 + ret);
212
213 /* sound buffer will be processed on next read_packet() call */
214 184 cin->audio_buffer_size = hdr->audio_frame_size;
215 184 return 0;
216 }
217
218 /* audio packet */
219 184 ret = av_get_packet(pb, pkt, cin->audio_buffer_size);
220
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 184 if (ret < 0)
221 2 return ret;
222
223 182 pkt->stream_index = cin->audio_stream_index;
224 182 pkt->pts = cin->audio_stream_pts;
225 182 pkt->duration = cin->audio_buffer_size - (pkt->pts == 0);
226 182 cin->audio_stream_pts += pkt->duration;
227 182 cin->audio_buffer_size = 0;
228 182 return 0;
229 }
230
231 const FFInputFormat ff_dsicin_demuxer = {
232 .p.name = "dsicin",
233 .p.long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN"),
234 .priv_data_size = sizeof(CinDemuxContext),
235 .read_probe = cin_probe,
236 .read_header = cin_read_header,
237 .read_packet = cin_read_packet,
238 };
239