/src/ffmpeg/libavformat/dsicin.c
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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 | | static int cin_probe(const AVProbeData *p) |
65 | 358k | { |
66 | | /* header starts with this special marker */ |
67 | 358k | if (AV_RL32(&p->buf[0]) != 0x55AA0000) |
68 | 358k | return 0; |
69 | | |
70 | | /* for accuracy, check some header field values */ |
71 | 61 | if (AV_RL32(&p->buf[12]) != 22050 || p->buf[16] != 16 || p->buf[17] != 0) |
72 | 52 | return 0; |
73 | | |
74 | 9 | return AVPROBE_SCORE_MAX; |
75 | 61 | } |
76 | | |
77 | 6.16k | static int cin_read_file_header(CinDemuxContext *cin, AVIOContext *pb) { |
78 | 6.16k | CinFileHeader *hdr = &cin->file_header; |
79 | | |
80 | 6.16k | if (avio_rl32(pb) != 0x55AA0000) |
81 | 4.73k | return AVERROR_INVALIDDATA; |
82 | | |
83 | 1.42k | hdr->video_frame_size = avio_rl32(pb); |
84 | 1.42k | hdr->video_frame_width = avio_rl16(pb); |
85 | 1.42k | hdr->video_frame_height = avio_rl16(pb); |
86 | 1.42k | hdr->audio_frequency = avio_rl32(pb); |
87 | 1.42k | hdr->audio_bits = avio_r8(pb); |
88 | 1.42k | hdr->audio_stereo = avio_r8(pb); |
89 | 1.42k | hdr->audio_frame_size = avio_rl16(pb); |
90 | | |
91 | 1.42k | if (hdr->audio_frequency != 22050 || hdr->audio_bits != 16 || hdr->audio_stereo != 0) |
92 | 80 | return AVERROR_INVALIDDATA; |
93 | | |
94 | 1.34k | return 0; |
95 | 1.42k | } |
96 | | |
97 | | static int cin_read_header(AVFormatContext *s) |
98 | 6.16k | { |
99 | 6.16k | int rc; |
100 | 6.16k | CinDemuxContext *cin = s->priv_data; |
101 | 6.16k | CinFileHeader *hdr = &cin->file_header; |
102 | 6.16k | AVIOContext *pb = s->pb; |
103 | 6.16k | AVStream *st; |
104 | | |
105 | 6.16k | rc = cin_read_file_header(cin, pb); |
106 | 6.16k | if (rc) |
107 | 4.81k | return rc; |
108 | | |
109 | 1.34k | cin->video_stream_pts = 0; |
110 | 1.34k | cin->audio_stream_pts = 0; |
111 | 1.34k | cin->audio_buffer_size = 0; |
112 | | |
113 | | /* initialize the video decoder stream */ |
114 | 1.34k | st = avformat_new_stream(s, NULL); |
115 | 1.34k | if (!st) |
116 | 0 | return AVERROR(ENOMEM); |
117 | | |
118 | 1.34k | avpriv_set_pts_info(st, 32, 1, 12); |
119 | 1.34k | cin->video_stream_index = st->index; |
120 | 1.34k | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
121 | 1.34k | st->codecpar->codec_id = AV_CODEC_ID_DSICINVIDEO; |
122 | 1.34k | st->codecpar->codec_tag = 0; /* no fourcc */ |
123 | 1.34k | st->codecpar->width = hdr->video_frame_width; |
124 | 1.34k | st->codecpar->height = hdr->video_frame_height; |
125 | | |
126 | | /* initialize the audio decoder stream */ |
127 | 1.34k | st = avformat_new_stream(s, NULL); |
128 | 1.34k | if (!st) |
129 | 0 | return AVERROR(ENOMEM); |
130 | | |
131 | 1.34k | avpriv_set_pts_info(st, 32, 1, 22050); |
132 | 1.34k | cin->audio_stream_index = st->index; |
133 | 1.34k | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
134 | 1.34k | st->codecpar->codec_id = AV_CODEC_ID_DSICINAUDIO; |
135 | 1.34k | st->codecpar->codec_tag = 0; /* no tag */ |
136 | 1.34k | st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; |
137 | 1.34k | st->codecpar->sample_rate = 22050; |
138 | 1.34k | st->codecpar->bits_per_coded_sample = 8; |
139 | 1.34k | st->codecpar->bit_rate = st->codecpar->sample_rate * |
140 | 1.34k | st->codecpar->bits_per_coded_sample * |
141 | 1.34k | st->codecpar->ch_layout.nb_channels; |
142 | | |
143 | 1.34k | return 0; |
144 | 1.34k | } |
145 | | |
146 | 17.3k | static int cin_read_frame_header(CinDemuxContext *cin, AVIOContext *pb) { |
147 | 17.3k | CinFrameHeader *hdr = &cin->frame_header; |
148 | | |
149 | 17.3k | hdr->video_frame_type = avio_r8(pb); |
150 | 17.3k | hdr->audio_frame_type = avio_r8(pb); |
151 | 17.3k | hdr->pal_colors_count = avio_rl16(pb); |
152 | 17.3k | hdr->video_frame_size = avio_rl32(pb); |
153 | 17.3k | hdr->audio_frame_size = avio_rl32(pb); |
154 | | |
155 | 17.3k | if (avio_feof(pb) || pb->error) |
156 | 1.23k | return AVERROR(EIO); |
157 | | |
158 | 16.0k | if (avio_rl32(pb) != 0xAA55AA55) |
159 | 221 | return AVERROR_INVALIDDATA; |
160 | 15.8k | if (hdr->video_frame_size < 0 || hdr->audio_frame_size < 0) |
161 | 50 | return AVERROR_INVALIDDATA; |
162 | | |
163 | 15.8k | return 0; |
164 | 15.8k | } |
165 | | |
166 | | static int cin_read_packet(AVFormatContext *s, AVPacket *pkt) |
167 | 30.0k | { |
168 | 30.0k | CinDemuxContext *cin = s->priv_data; |
169 | 30.0k | AVIOContext *pb = s->pb; |
170 | 30.0k | CinFrameHeader *hdr = &cin->frame_header; |
171 | 30.0k | int rc, palette_type; |
172 | 30.0k | int64_t pkt_size; |
173 | 30.0k | int ret; |
174 | | |
175 | 30.0k | if (cin->audio_buffer_size == 0) { |
176 | 17.3k | rc = cin_read_frame_header(cin, pb); |
177 | 17.3k | if (rc) |
178 | 1.51k | return rc; |
179 | | |
180 | 15.8k | if ((int16_t)hdr->pal_colors_count < 0) { |
181 | 297 | hdr->pal_colors_count = -(int16_t)hdr->pal_colors_count; |
182 | 297 | palette_type = 1; |
183 | 15.5k | } else { |
184 | 15.5k | palette_type = 0; |
185 | 15.5k | } |
186 | | |
187 | | /* palette and video packet */ |
188 | 15.8k | pkt_size = (palette_type + 3LL) * hdr->pal_colors_count + hdr->video_frame_size; |
189 | 15.8k | if (pkt_size + 4 > INT_MAX) |
190 | 8 | return AVERROR_INVALIDDATA; |
191 | | |
192 | 15.7k | pkt_size = ffio_limit(pb, pkt_size); |
193 | | |
194 | 15.7k | ret = av_new_packet(pkt, 4 + pkt_size); |
195 | 15.7k | if (ret < 0) |
196 | 10 | return ret; |
197 | | |
198 | 15.7k | pkt->stream_index = cin->video_stream_index; |
199 | 15.7k | pkt->pts = cin->video_stream_pts++; |
200 | | |
201 | 15.7k | pkt->data[0] = palette_type; |
202 | 15.7k | pkt->data[1] = hdr->pal_colors_count & 0xFF; |
203 | 15.7k | pkt->data[2] = hdr->pal_colors_count >> 8; |
204 | 15.7k | pkt->data[3] = hdr->video_frame_type; |
205 | | |
206 | 15.7k | ret = avio_read(pb, &pkt->data[4], pkt_size); |
207 | 15.7k | if (ret < 0) { |
208 | 66 | return ret; |
209 | 66 | } |
210 | 15.7k | if (ret < pkt_size) |
211 | 94 | av_shrink_packet(pkt, 4 + ret); |
212 | | |
213 | | /* sound buffer will be processed on next read_packet() call */ |
214 | 15.7k | cin->audio_buffer_size = hdr->audio_frame_size; |
215 | 15.7k | return 0; |
216 | 15.7k | } |
217 | | |
218 | | /* audio packet */ |
219 | 12.7k | ret = av_get_packet(pb, pkt, cin->audio_buffer_size); |
220 | 12.7k | if (ret < 0) |
221 | 590 | return ret; |
222 | | |
223 | 12.1k | pkt->stream_index = cin->audio_stream_index; |
224 | 12.1k | pkt->pts = cin->audio_stream_pts; |
225 | 12.1k | pkt->duration = cin->audio_buffer_size - (pkt->pts == 0); |
226 | 12.1k | cin->audio_stream_pts += pkt->duration; |
227 | 12.1k | cin->audio_buffer_size = 0; |
228 | 12.1k | return 0; |
229 | 12.7k | } |
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 | | }; |