FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/dsicin.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 94 110 85.5%
Branches: 27 48 56.2%

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 "internal.h"
31 #include "avio_internal.h"
32
33
34 typedef struct CinFileHeader {
35 int video_frame_size;
36 int video_frame_width;
37 int video_frame_height;
38 int audio_frequency;
39 int audio_bits;
40 int audio_stereo;
41 int audio_frame_size;
42 } CinFileHeader;
43
44 typedef struct CinFrameHeader {
45 int audio_frame_type;
46 int video_frame_type;
47 int pal_colors_count;
48 int audio_frame_size;
49 int video_frame_size;
50 } CinFrameHeader;
51
52 typedef struct CinDemuxContext {
53 int audio_stream_index;
54 int video_stream_index;
55 CinFileHeader file_header;
56 int64_t audio_stream_pts;
57 int64_t video_stream_pts;
58 CinFrameHeader frame_header;
59 int audio_buffer_size;
60 } CinDemuxContext;
61
62
63 6780 static int cin_probe(const AVProbeData *p)
64 {
65 /* header starts with this special marker */
66
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6780 if (AV_RL32(&p->buf[0]) != 0x55AA0000)
67 6778 return 0;
68
69 /* for accuracy, check some header field values */
70
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2 if (AV_RL32(&p->buf[12]) != 22050 || p->buf[16] != 16 || p->buf[17] != 0)
71 return 0;
72
73 2 return AVPROBE_SCORE_MAX;
74 }
75
76 2 static int cin_read_file_header(CinDemuxContext *cin, AVIOContext *pb) {
77 2 CinFileHeader *hdr = &cin->file_header;
78
79
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2 if (avio_rl32(pb) != 0x55AA0000)
80 return AVERROR_INVALIDDATA;
81
82 2 hdr->video_frame_size = avio_rl32(pb);
83 2 hdr->video_frame_width = avio_rl16(pb);
84 2 hdr->video_frame_height = avio_rl16(pb);
85 2 hdr->audio_frequency = avio_rl32(pb);
86 2 hdr->audio_bits = avio_r8(pb);
87 2 hdr->audio_stereo = avio_r8(pb);
88 2 hdr->audio_frame_size = avio_rl16(pb);
89
90
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2 if (hdr->audio_frequency != 22050 || hdr->audio_bits != 16 || hdr->audio_stereo != 0)
91 return AVERROR_INVALIDDATA;
92
93 2 return 0;
94 }
95
96 2 static int cin_read_header(AVFormatContext *s)
97 {
98 int rc;
99 2 CinDemuxContext *cin = s->priv_data;
100 2 CinFileHeader *hdr = &cin->file_header;
101 2 AVIOContext *pb = s->pb;
102 AVStream *st;
103
104 2 rc = cin_read_file_header(cin, pb);
105
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2 if (rc)
106 return rc;
107
108 2 cin->video_stream_pts = 0;
109 2 cin->audio_stream_pts = 0;
110 2 cin->audio_buffer_size = 0;
111
112 /* initialize the video decoder stream */
113 2 st = avformat_new_stream(s, NULL);
114
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2 if (!st)
115 return AVERROR(ENOMEM);
116
117 2 avpriv_set_pts_info(st, 32, 1, 12);
118 2 cin->video_stream_index = st->index;
119 2 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
120 2 st->codecpar->codec_id = AV_CODEC_ID_DSICINVIDEO;
121 2 st->codecpar->codec_tag = 0; /* no fourcc */
122 2 st->codecpar->width = hdr->video_frame_width;
123 2 st->codecpar->height = hdr->video_frame_height;
124
125 /* initialize the audio decoder stream */
126 2 st = avformat_new_stream(s, NULL);
127
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2 if (!st)
128 return AVERROR(ENOMEM);
129
130 2 avpriv_set_pts_info(st, 32, 1, 22050);
131 2 cin->audio_stream_index = st->index;
132 2 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
133 2 st->codecpar->codec_id = AV_CODEC_ID_DSICINAUDIO;
134 2 st->codecpar->codec_tag = 0; /* no tag */
135 2 st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
136 2 st->codecpar->sample_rate = 22050;
137 2 st->codecpar->bits_per_coded_sample = 8;
138 2 st->codecpar->bit_rate = st->codecpar->sample_rate *
139 2 st->codecpar->bits_per_coded_sample *
140 2 st->codecpar->ch_layout.nb_channels;
141
142 2 return 0;
143 }
144
145 184 static int cin_read_frame_header(CinDemuxContext *cin, AVIOContext *pb) {
146 184 CinFrameHeader *hdr = &cin->frame_header;
147
148 184 hdr->video_frame_type = avio_r8(pb);
149 184 hdr->audio_frame_type = avio_r8(pb);
150 184 hdr->pal_colors_count = avio_rl16(pb);
151 184 hdr->video_frame_size = avio_rl32(pb);
152 184 hdr->audio_frame_size = avio_rl32(pb);
153
154
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184 if (avio_feof(pb) || pb->error)
155 return AVERROR(EIO);
156
157
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184 if (avio_rl32(pb) != 0xAA55AA55)
158 return AVERROR_INVALIDDATA;
159
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184 if (hdr->video_frame_size < 0 || hdr->audio_frame_size < 0)
160 return AVERROR_INVALIDDATA;
161
162 184 return 0;
163 }
164
165 368 static int cin_read_packet(AVFormatContext *s, AVPacket *pkt)
166 {
167 368 CinDemuxContext *cin = s->priv_data;
168 368 AVIOContext *pb = s->pb;
169 368 CinFrameHeader *hdr = &cin->frame_header;
170 int rc, palette_type;
171 int64_t pkt_size;
172 int ret;
173
174
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368 if (cin->audio_buffer_size == 0) {
175 184 rc = cin_read_frame_header(cin, pb);
176
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184 if (rc)
177 return rc;
178
179
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184 if ((int16_t)hdr->pal_colors_count < 0) {
180 hdr->pal_colors_count = -(int16_t)hdr->pal_colors_count;
181 palette_type = 1;
182 } else {
183 184 palette_type = 0;
184 }
185
186 /* palette and video packet */
187 184 pkt_size = (palette_type + 3LL) * hdr->pal_colors_count + hdr->video_frame_size;
188
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184 if (pkt_size + 4 > INT_MAX)
189 return AVERROR_INVALIDDATA;
190
191 184 pkt_size = ffio_limit(pb, pkt_size);
192
193 184 ret = av_new_packet(pkt, 4 + pkt_size);
194
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184 if (ret < 0)
195 return ret;
196
197 184 pkt->stream_index = cin->video_stream_index;
198 184 pkt->pts = cin->video_stream_pts++;
199
200 184 pkt->data[0] = palette_type;
201 184 pkt->data[1] = hdr->pal_colors_count & 0xFF;
202 184 pkt->data[2] = hdr->pal_colors_count >> 8;
203 184 pkt->data[3] = hdr->video_frame_type;
204
205 184 ret = avio_read(pb, &pkt->data[4], pkt_size);
206
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184 if (ret < 0) {
207 return ret;
208 }
209
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184 if (ret < pkt_size)
210 av_shrink_packet(pkt, 4 + ret);
211
212 /* sound buffer will be processed on next read_packet() call */
213 184 cin->audio_buffer_size = hdr->audio_frame_size;
214 184 return 0;
215 }
216
217 /* audio packet */
218 184 ret = av_get_packet(pb, pkt, cin->audio_buffer_size);
219
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184 if (ret < 0)
220 2 return ret;
221
222 182 pkt->stream_index = cin->audio_stream_index;
223 182 pkt->pts = cin->audio_stream_pts;
224 182 pkt->duration = cin->audio_buffer_size - (pkt->pts == 0);
225 182 cin->audio_stream_pts += pkt->duration;
226 182 cin->audio_buffer_size = 0;
227 182 return 0;
228 }
229
230 const AVInputFormat ff_dsicin_demuxer = {
231 .name = "dsicin",
232 .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN"),
233 .priv_data_size = sizeof(CinDemuxContext),
234 .read_probe = cin_probe,
235 .read_header = cin_read_header,
236 .read_packet = cin_read_packet,
237 };
238