dsicin.c
Go to the documentation of this file.
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 
28 #include "libavutil/intreadwrite.h"
29 #include "avformat.h"
30 #include "internal.h"
31 
32 
33 typedef struct CinFileHeader {
42 
43 typedef struct CinFrameHeader {
50 
51 typedef struct CinDemuxContext {
60 
61 
62 static int cin_probe(AVProbeData *p)
63 {
64  /* header starts with this special marker */
65  if (AV_RL32(&p->buf[0]) != 0x55AA0000)
66  return 0;
67 
68  /* for accuracy, check some header field values */
69  if (AV_RL32(&p->buf[12]) != 22050 || p->buf[16] != 16 || p->buf[17] != 0)
70  return 0;
71 
72  return AVPROBE_SCORE_MAX;
73 }
74 
76  CinFileHeader *hdr = &cin->file_header;
77 
78  if (avio_rl32(pb) != 0x55AA0000)
79  return AVERROR_INVALIDDATA;
80 
81  hdr->video_frame_size = avio_rl32(pb);
82  hdr->video_frame_width = avio_rl16(pb);
83  hdr->video_frame_height = avio_rl16(pb);
84  hdr->audio_frequency = avio_rl32(pb);
85  hdr->audio_bits = avio_r8(pb);
86  hdr->audio_stereo = avio_r8(pb);
87  hdr->audio_frame_size = avio_rl16(pb);
88 
89  if (hdr->audio_frequency != 22050 || hdr->audio_bits != 16 || hdr->audio_stereo != 0)
90  return AVERROR_INVALIDDATA;
91 
92  return 0;
93 }
94 
96 {
97  int rc;
98  CinDemuxContext *cin = s->priv_data;
99  CinFileHeader *hdr = &cin->file_header;
100  AVIOContext *pb = s->pb;
101  AVStream *st;
102 
103  rc = cin_read_file_header(cin, pb);
104  if (rc)
105  return rc;
106 
107  cin->video_stream_pts = 0;
108  cin->audio_stream_pts = 0;
109  cin->audio_buffer_size = 0;
110 
111  /* initialize the video decoder stream */
112  st = avformat_new_stream(s, NULL);
113  if (!st)
114  return AVERROR(ENOMEM);
115 
116  avpriv_set_pts_info(st, 32, 1, 12);
117  cin->video_stream_index = st->index;
120  st->codec->codec_tag = 0; /* no fourcc */
121  st->codec->width = hdr->video_frame_width;
122  st->codec->height = hdr->video_frame_height;
123 
124  /* initialize the audio decoder stream */
125  st = avformat_new_stream(s, NULL);
126  if (!st)
127  return AVERROR(ENOMEM);
128 
129  avpriv_set_pts_info(st, 32, 1, 22050);
130  cin->audio_stream_index = st->index;
133  st->codec->codec_tag = 0; /* no tag */
134  st->codec->channels = 1;
136  st->codec->sample_rate = 22050;
137  st->codec->bits_per_coded_sample = 8;
139 
140  return 0;
141 }
142 
144  CinFrameHeader *hdr = &cin->frame_header;
145 
146  hdr->video_frame_type = avio_r8(pb);
147  hdr->audio_frame_type = avio_r8(pb);
148  hdr->pal_colors_count = avio_rl16(pb);
149  hdr->video_frame_size = avio_rl32(pb);
150  hdr->audio_frame_size = avio_rl32(pb);
151 
152  if (pb->eof_reached || pb->error)
153  return AVERROR(EIO);
154 
155  if (avio_rl32(pb) != 0xAA55AA55)
156  return AVERROR_INVALIDDATA;
157  if (hdr->video_frame_size < 0 || hdr->audio_frame_size < 0)
158  return AVERROR_INVALIDDATA;
159 
160  return 0;
161 }
162 
164 {
165  CinDemuxContext *cin = s->priv_data;
166  AVIOContext *pb = s->pb;
167  CinFrameHeader *hdr = &cin->frame_header;
168  int rc, palette_type, pkt_size;
169  int ret;
170 
171  if (cin->audio_buffer_size == 0) {
172  rc = cin_read_frame_header(cin, pb);
173  if (rc)
174  return rc;
175 
176  if ((int16_t)hdr->pal_colors_count < 0) {
177  hdr->pal_colors_count = -(int16_t)hdr->pal_colors_count;
178  palette_type = 1;
179  } else {
180  palette_type = 0;
181  }
182 
183  /* palette and video packet */
184  pkt_size = (palette_type + 3) * hdr->pal_colors_count + hdr->video_frame_size;
185 
186  ret = av_new_packet(pkt, 4 + pkt_size);
187  if (ret < 0)
188  return ret;
189 
190  pkt->stream_index = cin->video_stream_index;
191  pkt->pts = cin->video_stream_pts++;
192 
193  pkt->data[0] = palette_type;
194  pkt->data[1] = hdr->pal_colors_count & 0xFF;
195  pkt->data[2] = hdr->pal_colors_count >> 8;
196  pkt->data[3] = hdr->video_frame_type;
197 
198  ret = avio_read(pb, &pkt->data[4], pkt_size);
199  if (ret < 0) {
200  av_free_packet(pkt);
201  return ret;
202  }
203  if (ret < pkt_size)
204  av_shrink_packet(pkt, 4 + ret);
205 
206  /* sound buffer will be processed on next read_packet() call */
208  return 0;
209  }
210 
211  /* audio packet */
212  ret = av_get_packet(pb, pkt, cin->audio_buffer_size);
213  if (ret < 0)
214  return ret;
215 
216  pkt->stream_index = cin->audio_stream_index;
217  pkt->pts = cin->audio_stream_pts;
218  pkt->duration = cin->audio_buffer_size - (pkt->pts == 0);
219  cin->audio_stream_pts += pkt->duration;
220  cin->audio_buffer_size = 0;
221  return 0;
222 }
223 
225  .name = "dsicin",
226  .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN"),
227  .priv_data_size = sizeof(CinDemuxContext),
231 };