FFmpeg
dsicin.c
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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 
28 #include "libavutil/intreadwrite.h"
29 #include "avformat.h"
30 #include "internal.h"
31 #include "avio_internal.h"
32 
33 
34 typedef struct CinFileHeader {
43 
44 typedef struct CinFrameHeader {
51 
52 typedef struct CinDemuxContext {
61 
62 
63 static int cin_probe(const 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 
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 
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;
121  st->codecpar->codec_tag = 0; /* no fourcc */
122  st->codecpar->width = hdr->video_frame_width;
123  st->codecpar->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;
134  st->codecpar->codec_tag = 0; /* no tag */
135  st->codecpar->channels = 1;
137  st->codecpar->sample_rate = 22050;
140 
141  return 0;
142 }
143 
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 
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_packet_unref(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 */
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 
228  .name = "dsicin",
229  .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN"),
230  .priv_data_size = sizeof(CinDemuxContext),
234 };
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: avpacket.c:101
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4929
int video_stream_index
Definition: dsicin.c:54
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3968
int index
stream index in AVFormatContext
Definition: avformat.h:882
static int cin_read_frame_header(CinDemuxContext *cin, AVIOContext *pb)
Definition: dsicin.c:144
static AVPacket pkt
Format I/O context.
Definition: avformat.h:1358
int ffio_limit(AVIOContext *s, int size)
Definition: utils.c:247
int width
Video only.
Definition: avcodec.h:4034
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1498
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4502
uint8_t * data
Definition: avcodec.h:1480
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:310
static int cin_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: dsicin.c:164
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4070
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:650
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3997
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
int video_frame_size
Definition: dsicin.c:49
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:772
int audio_frequency
Definition: dsicin.c:38
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3964
CinFrameHeader frame_header
Definition: dsicin.c:58
int video_frame_width
Definition: dsicin.c:36
CinFileHeader file_header
Definition: dsicin.c:55
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:641
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
int64_t video_stream_pts
Definition: dsicin.c:57
audio channel layout utility functions
int audio_frame_size
Definition: dsicin.c:48
#define s(width, name)
Definition: cbs_vp9.c:257
int audio_stream_index
Definition: dsicin.c:53
AVInputFormat ff_dsicin_demuxer
Definition: dsicin.c:227
int pal_colors_count
Definition: dsicin.c:47
static int cin_probe(const AVProbeData *p)
Definition: dsicin.c:63
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:881
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
static int cin_read_file_header(CinDemuxContext *cin, AVIOContext *pb)
Definition: dsicin.c:76
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:599
int video_frame_height
Definition: dsicin.c:37
int error
contains the error code or 0 if no error happened
Definition: avio.h:245
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int sample_rate
Audio only.
Definition: avcodec.h:4078
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
static int cin_read_header(AVFormatContext *s)
Definition: dsicin.c:96
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:756
Main libavformat public API header.
int64_t audio_stream_pts
Definition: dsicin.c:56
int audio_bits
Definition: dsicin.c:39
int video_frame_type
Definition: dsicin.c:46
int video_frame_size
Definition: dsicin.c:35
void * priv_data
Format private data.
Definition: avformat.h:1386
int audio_frame_size
Definition: dsicin.c:41
int audio_stereo
Definition: dsicin.c:40
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4010
int channels
Audio only.
Definition: avcodec.h:4074
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
int audio_buffer_size
Definition: dsicin.c:59
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:361
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3972
int stream_index
Definition: avcodec.h:1482
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
#define AV_CH_LAYOUT_MONO
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1457
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1473
int audio_frame_type
Definition: dsicin.c:45