3c7589b55678df829b9dfaadd80fbc3ed0d59bfe
[libav.git] / libavformat / dsicin.c
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 Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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/intreadwrite.h"
28 #include "avformat.h"
29
30
31 typedef struct CinFileHeader {
32 int video_frame_size;
33 int video_frame_width;
34 int video_frame_height;
35 int audio_frequency;
36 int audio_bits;
37 int audio_stereo;
38 int audio_frame_size;
39 } CinFileHeader;
40
41 typedef struct CinFrameHeader {
42 int audio_frame_type;
43 int video_frame_type;
44 int pal_colors_count;
45 int audio_frame_size;
46 int video_frame_size;
47 } CinFrameHeader;
48
49 typedef struct CinDemuxContext {
50 int audio_stream_index;
51 int video_stream_index;
52 CinFileHeader file_header;
53 int64_t audio_stream_pts;
54 int64_t video_stream_pts;
55 CinFrameHeader frame_header;
56 int audio_buffer_size;
57 } CinDemuxContext;
58
59
60 static int cin_probe(AVProbeData *p)
61 {
62 /* header starts with this special marker */
63 if (AV_RL32(&p->buf[0]) != 0x55AA0000)
64 return 0;
65
66 /* for accuracy, check some header field values */
67 if (AV_RL32(&p->buf[12]) != 22050 || p->buf[16] != 16 || p->buf[17] != 0)
68 return 0;
69
70 return AVPROBE_SCORE_MAX;
71 }
72
73 static int cin_read_file_header(CinDemuxContext *cin, AVIOContext *pb) {
74 CinFileHeader *hdr = &cin->file_header;
75
76 if (avio_rl32(pb) != 0x55AA0000)
77 return AVERROR_INVALIDDATA;
78
79 hdr->video_frame_size = avio_rl32(pb);
80 hdr->video_frame_width = avio_rl16(pb);
81 hdr->video_frame_height = avio_rl16(pb);
82 hdr->audio_frequency = avio_rl32(pb);
83 hdr->audio_bits = avio_r8(pb);
84 hdr->audio_stereo = avio_r8(pb);
85 hdr->audio_frame_size = avio_rl16(pb);
86
87 if (hdr->audio_frequency != 22050 || hdr->audio_bits != 16 || hdr->audio_stereo != 0)
88 return AVERROR_INVALIDDATA;
89
90 return 0;
91 }
92
93 static int cin_read_header(AVFormatContext *s, AVFormatParameters *ap)
94 {
95 int rc;
96 CinDemuxContext *cin = s->priv_data;
97 CinFileHeader *hdr = &cin->file_header;
98 AVIOContext *pb = s->pb;
99 AVStream *st;
100
101 rc = cin_read_file_header(cin, pb);
102 if (rc)
103 return rc;
104
105 cin->video_stream_pts = 0;
106 cin->audio_stream_pts = 0;
107 cin->audio_buffer_size = 0;
108
109 /* initialize the video decoder stream */
110 st = avformat_new_stream(s, NULL);
111 if (!st)
112 return AVERROR(ENOMEM);
113
114 av_set_pts_info(st, 32, 1, 12);
115 cin->video_stream_index = st->index;
116 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
117 st->codec->codec_id = CODEC_ID_DSICINVIDEO;
118 st->codec->codec_tag = 0; /* no fourcc */
119 st->codec->width = hdr->video_frame_width;
120 st->codec->height = hdr->video_frame_height;
121
122 /* initialize the audio decoder stream */
123 st = avformat_new_stream(s, NULL);
124 if (!st)
125 return AVERROR(ENOMEM);
126
127 av_set_pts_info(st, 32, 1, 22050);
128 cin->audio_stream_index = st->index;
129 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
130 st->codec->codec_id = CODEC_ID_DSICINAUDIO;
131 st->codec->codec_tag = 0; /* no tag */
132 st->codec->channels = 1;
133 st->codec->sample_rate = 22050;
134 st->codec->bits_per_coded_sample = 16;
135 st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels;
136 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
137
138 return 0;
139 }
140
141 static int cin_read_frame_header(CinDemuxContext *cin, AVIOContext *pb) {
142 CinFrameHeader *hdr = &cin->frame_header;
143
144 hdr->video_frame_type = avio_r8(pb);
145 hdr->audio_frame_type = avio_r8(pb);
146 hdr->pal_colors_count = avio_rl16(pb);
147 hdr->video_frame_size = avio_rl32(pb);
148 hdr->audio_frame_size = avio_rl32(pb);
149
150 if (pb->eof_reached || pb->error)
151 return AVERROR(EIO);
152
153 if (avio_rl32(pb) != 0xAA55AA55)
154 return AVERROR_INVALIDDATA;
155
156 return 0;
157 }
158
159 static int cin_read_packet(AVFormatContext *s, AVPacket *pkt)
160 {
161 CinDemuxContext *cin = s->priv_data;
162 AVIOContext *pb = s->pb;
163 CinFrameHeader *hdr = &cin->frame_header;
164 int rc, palette_type, pkt_size;
165 int ret;
166
167 if (cin->audio_buffer_size == 0) {
168 rc = cin_read_frame_header(cin, pb);
169 if (rc)
170 return rc;
171
172 if ((int16_t)hdr->pal_colors_count < 0) {
173 hdr->pal_colors_count = -(int16_t)hdr->pal_colors_count;
174 palette_type = 1;
175 } else {
176 palette_type = 0;
177 }
178
179 /* palette and video packet */
180 pkt_size = (palette_type + 3) * hdr->pal_colors_count + hdr->video_frame_size;
181
182 ret = av_new_packet(pkt, 4 + pkt_size);
183 if (ret < 0)
184 return ret;
185
186 pkt->stream_index = cin->video_stream_index;
187 pkt->pts = cin->video_stream_pts++;
188
189 pkt->data[0] = palette_type;
190 pkt->data[1] = hdr->pal_colors_count & 0xFF;
191 pkt->data[2] = hdr->pal_colors_count >> 8;
192 pkt->data[3] = hdr->video_frame_type;
193
194 ret = avio_read(pb, &pkt->data[4], pkt_size);
195 if (ret < 0) {
196 av_free_packet(pkt);
197 return ret;
198 }
199 if (ret < pkt_size)
200 av_shrink_packet(pkt, 4 + ret);
201
202 /* sound buffer will be processed on next read_packet() call */
203 cin->audio_buffer_size = hdr->audio_frame_size;
204 return 0;
205 }
206
207 /* audio packet */
208 ret = av_get_packet(pb, pkt, cin->audio_buffer_size);
209 if (ret < 0)
210 return ret;
211
212 pkt->stream_index = cin->audio_stream_index;
213 pkt->pts = cin->audio_stream_pts;
214 cin->audio_stream_pts += cin->audio_buffer_size * 2 / cin->file_header.audio_frame_size;
215 cin->audio_buffer_size = 0;
216 return 0;
217 }
218
219 AVInputFormat ff_dsicin_demuxer = {
220 .name = "dsicin",
221 .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN format"),
222 .priv_data_size = sizeof(CinDemuxContext),
223 .read_probe = cin_probe,
224 .read_header = cin_read_header,
225 .read_packet = cin_read_packet,
226 };