FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/gdv.c
Date: 2022-12-05 20:26:17
Exec Total Coverage
Lines: 3 85 3.5%
Functions: 1 3 33.3%
Branches: 1 50 2.0%

Line Branch Exec Source
1 /*
2 * Gremlin Digital Video demuxer
3 * Copyright (c) 2017 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/intreadwrite.h"
23
24 #include "avformat.h"
25 #include "avio.h"
26 #include "internal.h"
27
28 typedef struct GDVContext {
29 int is_first_video;
30 int is_audio;
31 int audio_size;
32 int audio_stream_index;
33 int video_stream_index;
34 unsigned pal[256];
35 } GDVContext;
36
37 6782 static int gdv_read_probe(const AVProbeData *p)
38 {
39
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✓ Branch 1 taken 6782 times.
6782 if (AV_RL32(p->buf) == 0x29111994)
40 return AVPROBE_SCORE_MAX;
41
42 6782 return 0;
43 }
44
45 static struct {
46 uint16_t id;
47 uint16_t width;
48 uint16_t height;
49 } FixedSize[] = {
50 { 0, 320, 200},
51 { 1, 640, 200},
52 { 2, 320, 167},
53 { 3, 320, 180},
54 { 4, 320, 400},
55 { 5, 320, 170},
56 { 6, 160, 85},
57 { 7, 160, 83},
58 { 8, 160, 90},
59 { 9, 280, 128},
60 {10, 320, 240},
61 {11, 320, 201},
62 {16, 640, 400},
63 {17, 640, 200},
64 {18, 640, 180},
65 {19, 640, 167},
66 {20, 640, 170},
67 {21, 320, 240}
68 };
69
70 static int gdv_read_header(AVFormatContext *ctx)
71 {
72 GDVContext *gdv = ctx->priv_data;
73 AVIOContext *pb = ctx->pb;
74 AVStream *vst, *ast;
75 unsigned fps, snd_flags, vid_depth, size_id;
76
77 avio_skip(pb, 4);
78 size_id = avio_rl16(pb);
79
80 vst = avformat_new_stream(ctx, 0);
81 if (!vst)
82 return AVERROR(ENOMEM);
83
84 vst->start_time = 0;
85 vst->duration =
86 vst->nb_frames = avio_rl16(pb);
87
88 fps = avio_rl16(pb);
89 if (!fps)
90 return AVERROR_INVALIDDATA;
91
92 snd_flags = avio_rl16(pb);
93 if (snd_flags & 1) {
94 ast = avformat_new_stream(ctx, 0);
95 if (!ast)
96 return AVERROR(ENOMEM);
97
98 ast->start_time = 0;
99 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
100 ast->codecpar->codec_tag = 0;
101 ast->codecpar->sample_rate = avio_rl16(pb);
102 ast->codecpar->ch_layout.nb_channels = 1 + !!(snd_flags & 2);
103 if (snd_flags & 8) {
104 ast->codecpar->codec_id = AV_CODEC_ID_GREMLIN_DPCM;
105 } else {
106 ast->codecpar->codec_id = (snd_flags & 4) ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_U8;
107 }
108
109 avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
110 gdv->audio_size = (ast->codecpar->sample_rate / fps) *
111 ast->codecpar->ch_layout.nb_channels *
112 (1 + !!(snd_flags & 4)) / (1 + !!(snd_flags & 8));
113 gdv->is_audio = 1;
114 } else {
115 avio_skip(pb, 2);
116 }
117 vid_depth = avio_rl16(pb);
118 avio_skip(pb, 4);
119
120 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
121 vst->codecpar->codec_id = AV_CODEC_ID_GDV;
122 vst->codecpar->codec_tag = 0;
123 vst->codecpar->width = avio_rl16(pb);
124 vst->codecpar->height = avio_rl16(pb);
125
126 if (vst->codecpar->width == 0 || vst->codecpar->height == 0) {
127 int i;
128
129 for (i = 0; i < FF_ARRAY_ELEMS(FixedSize) - 1; i++) {
130 if (FixedSize[i].id == size_id)
131 break;
132 }
133
134 vst->codecpar->width = FixedSize[i].width;
135 vst->codecpar->height = FixedSize[i].height;
136 }
137
138 avpriv_set_pts_info(vst, 64, 1, fps);
139
140 if (vid_depth & 1) {
141 int i;
142
143 for (i = 0; i < 256; i++) {
144 unsigned r = avio_r8(pb);
145 unsigned g = avio_r8(pb);
146 unsigned b = avio_r8(pb);
147 gdv->pal[i] = 0xFFU << 24 | r << 18 | g << 10 | b << 2;
148 }
149 }
150
151 gdv->is_first_video = 1;
152
153 return 0;
154 }
155
156 static int gdv_read_packet(AVFormatContext *ctx, AVPacket *pkt)
157 {
158 GDVContext *gdv = ctx->priv_data;
159 AVIOContext *pb = ctx->pb;
160 int ret;
161
162 if (avio_feof(pb))
163 return pb->error ? pb->error : AVERROR_EOF;
164
165 if (gdv->audio_size && gdv->is_audio) {
166 ret = av_get_packet(pb, pkt, gdv->audio_size);
167 if (ret < 0)
168 return ret;
169 pkt->stream_index = 1;
170 gdv->is_audio = 0;
171 } else {
172 uint8_t *pal;
173
174 if (avio_rl16(pb) != 0x1305)
175 return AVERROR_INVALIDDATA;
176 ret = av_get_packet(pb, pkt, 4 + avio_rl16(pb));
177 if (ret < 0)
178 return ret;
179 pkt->stream_index = 0;
180 gdv->is_audio = 1;
181
182 if (gdv->is_first_video) {
183 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,
184 AVPALETTE_SIZE);
185 if (!pal) {
186 return AVERROR(ENOMEM);
187 }
188 memcpy(pal, gdv->pal, AVPALETTE_SIZE);
189 pkt->flags |= AV_PKT_FLAG_KEY;
190 gdv->is_first_video = 0;
191 }
192 }
193
194 return 0;
195 }
196
197 const AVInputFormat ff_gdv_demuxer = {
198 .name = "gdv",
199 .long_name = NULL_IF_CONFIG_SMALL("Gremlin Digital Video"),
200 .priv_data_size = sizeof(GDVContext),
201 .read_probe = gdv_read_probe,
202 .read_header = gdv_read_header,
203 .read_packet = gdv_read_packet,
204 };
205