2 * Delphine Software International CIN File Demuxer
3 * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
5 * This file is part of FFmpeg.
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.
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.
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
24 * Delphine Software International CIN file demuxer
27 #include "libavutil/intreadwrite.h"
31 typedef struct CinFileHeader {
33 int video_frame_width;
34 int video_frame_height;
41 typedef struct CinFrameHeader {
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;
60 static int cin_probe(AVProbeData *p)
62 /* header starts with this special marker */
63 if (AV_RL32(&p->buf[0]) != 0x55AA0000)
66 /* for accuracy, check some header field values */
67 if (AV_RL32(&p->buf[12]) != 22050 || p->buf[16] != 16 || p->buf[17] != 0)
70 return AVPROBE_SCORE_MAX;
73 static int cin_read_file_header(CinDemuxContext *cin, ByteIOContext *pb) {
74 CinFileHeader *hdr = &cin->file_header;
76 if (get_le32(pb) != 0x55AA0000)
77 return AVERROR_INVALIDDATA;
79 hdr->video_frame_size = get_le32(pb);
80 hdr->video_frame_width = get_le16(pb);
81 hdr->video_frame_height = get_le16(pb);
82 hdr->audio_frequency = get_le32(pb);
83 hdr->audio_bits = get_byte(pb);
84 hdr->audio_stereo = get_byte(pb);
85 hdr->audio_frame_size = get_le16(pb);
87 if (hdr->audio_frequency != 22050 || hdr->audio_bits != 16 || hdr->audio_stereo != 0)
88 return AVERROR_INVALIDDATA;
93 static int cin_read_header(AVFormatContext *s, AVFormatParameters *ap)
96 CinDemuxContext *cin = s->priv_data;
97 CinFileHeader *hdr = &cin->file_header;
98 ByteIOContext *pb = s->pb;
101 rc = cin_read_file_header(cin, pb);
105 cin->video_stream_pts = 0;
106 cin->audio_stream_pts = 0;
107 cin->audio_buffer_size = 0;
109 /* initialize the video decoder stream */
110 st = av_new_stream(s, 0);
112 return AVERROR(ENOMEM);
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;
122 /* initialize the audio decoder stream */
123 st = av_new_stream(s, 0);
125 return AVERROR(ENOMEM);
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;
141 static int cin_read_frame_header(CinDemuxContext *cin, ByteIOContext *pb) {
142 CinFrameHeader *hdr = &cin->frame_header;
144 hdr->video_frame_type = get_byte(pb);
145 hdr->audio_frame_type = get_byte(pb);
146 hdr->pal_colors_count = get_le16(pb);
147 hdr->video_frame_size = get_le32(pb);
148 hdr->audio_frame_size = get_le32(pb);
150 if (url_feof(pb) || url_ferror(pb))
153 if (get_le32(pb) != 0xAA55AA55)
154 return AVERROR_INVALIDDATA;
159 static int cin_read_packet(AVFormatContext *s, AVPacket *pkt)
161 CinDemuxContext *cin = s->priv_data;
162 ByteIOContext *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 = get_buffer(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 cin->audio_stream_pts += cin->audio_buffer_size * 2 / cin->file_header.audio_frame_size;
215 cin->audio_buffer_size = 0;
219 AVInputFormat dsicin_demuxer = {
221 NULL_IF_CONFIG_SMALL("Delphine Software International CIN format"),
222 sizeof(CinDemuxContext),