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