2 * Delphine Software International CIN File Demuxer
3 * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
5 * This file is part of Libav.
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.
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.
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
24 * Delphine Software International CIN file demuxer
27 #include "libavutil/intreadwrite.h"
32 typedef struct CinFileHeader {
34 int video_frame_width;
35 int video_frame_height;
42 typedef struct CinFrameHeader {
50 typedef struct CinDemuxContext {
51 int audio_stream_index;
52 int video_stream_index;
53 CinFileHeader file_header;
54 int64_t audio_stream_pts;
55 int64_t video_stream_pts;
56 CinFrameHeader frame_header;
57 int audio_buffer_size;
61 static int cin_probe(AVProbeData *p)
63 /* header starts with this special marker */
64 if (AV_RL32(&p->buf[0]) != 0x55AA0000)
67 /* for accuracy, check some header field values */
68 if (AV_RL32(&p->buf[12]) != 22050 || p->buf[16] != 16 || p->buf[17] != 0)
71 return AVPROBE_SCORE_MAX;
74 static int cin_read_file_header(CinDemuxContext *cin, AVIOContext *pb) {
75 CinFileHeader *hdr = &cin->file_header;
77 if (avio_rl32(pb) != 0x55AA0000)
78 return AVERROR_INVALIDDATA;
80 hdr->video_frame_size = avio_rl32(pb);
81 hdr->video_frame_width = avio_rl16(pb);
82 hdr->video_frame_height = avio_rl16(pb);
83 hdr->audio_frequency = avio_rl32(pb);
84 hdr->audio_bits = avio_r8(pb);
85 hdr->audio_stereo = avio_r8(pb);
86 hdr->audio_frame_size = avio_rl16(pb);
88 if (hdr->audio_frequency != 22050 || hdr->audio_bits != 16 || hdr->audio_stereo != 0)
89 return AVERROR_INVALIDDATA;
94 static int cin_read_header(AVFormatContext *s)
97 CinDemuxContext *cin = s->priv_data;
98 CinFileHeader *hdr = &cin->file_header;
99 AVIOContext *pb = s->pb;
102 rc = cin_read_file_header(cin, pb);
106 cin->video_stream_pts = 0;
107 cin->audio_stream_pts = 0;
108 cin->audio_buffer_size = 0;
110 /* initialize the video decoder stream */
111 st = avformat_new_stream(s, NULL);
113 return AVERROR(ENOMEM);
115 avpriv_set_pts_info(st, 32, 1, 12);
116 cin->video_stream_index = st->index;
117 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
118 st->codec->codec_id = CODEC_ID_DSICINVIDEO;
119 st->codec->codec_tag = 0; /* no fourcc */
120 st->codec->width = hdr->video_frame_width;
121 st->codec->height = hdr->video_frame_height;
123 /* initialize the audio decoder stream */
124 st = avformat_new_stream(s, NULL);
126 return AVERROR(ENOMEM);
128 avpriv_set_pts_info(st, 32, 1, 22050);
129 cin->audio_stream_index = st->index;
130 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
131 st->codec->codec_id = CODEC_ID_DSICINAUDIO;
132 st->codec->codec_tag = 0; /* no tag */
133 st->codec->channels = 1;
134 st->codec->sample_rate = 22050;
135 st->codec->bits_per_coded_sample = 8;
136 st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels;
141 static int cin_read_frame_header(CinDemuxContext *cin, AVIOContext *pb) {
142 CinFrameHeader *hdr = &cin->frame_header;
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);
150 if (pb->eof_reached || pb->error)
153 if (avio_rl32(pb) != 0xAA55AA55)
154 return AVERROR_INVALIDDATA;
159 static int cin_read_packet(AVFormatContext *s, AVPacket *pkt)
161 CinDemuxContext *cin = s->priv_data;
162 AVIOContext *pb = s->pb;
163 CinFrameHeader *hdr = &cin->frame_header;
164 int rc, palette_type, pkt_size;
167 if (cin->audio_buffer_size == 0) {
168 rc = cin_read_frame_header(cin, pb);
172 if ((int16_t)hdr->pal_colors_count < 0) {
173 hdr->pal_colors_count = -(int16_t)hdr->pal_colors_count;
179 /* palette and video packet */
180 pkt_size = (palette_type + 3) * hdr->pal_colors_count + hdr->video_frame_size;
182 ret = av_new_packet(pkt, 4 + pkt_size);
186 pkt->stream_index = cin->video_stream_index;
187 pkt->pts = cin->video_stream_pts++;
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;
194 ret = avio_read(pb, &pkt->data[4], pkt_size);
200 av_shrink_packet(pkt, 4 + ret);
202 /* sound buffer will be processed on next read_packet() call */
203 cin->audio_buffer_size = hdr->audio_frame_size;
208 ret = av_get_packet(pb, pkt, cin->audio_buffer_size);
212 pkt->stream_index = cin->audio_stream_index;
213 pkt->pts = cin->audio_stream_pts;
214 pkt->duration = cin->audio_buffer_size - (pkt->pts == 0);
215 cin->audio_stream_pts += pkt->duration;
216 cin->audio_buffer_size = 0;
220 AVInputFormat ff_dsicin_demuxer = {
222 .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN format"),
223 .priv_data_size = sizeof(CinDemuxContext),
224 .read_probe = cin_probe,
225 .read_header = cin_read_header,
226 .read_packet = cin_read_packet,