FFmpeg: libavformat/tiertexseq.c Source File

FFmpeg
tiertexseq.c
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1 /*
2  * Tiertex Limited SEQ 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  * Tiertex Limited SEQ file demuxer
25  */
26 
27 #include "libavutil/channel_layout.h"
28 #include "avformat.h"
29 #include "internal.h"
30 
31  #define SEQ_FRAME_SIZE 6144
32  #define SEQ_FRAME_W 256
33  #define SEQ_FRAME_H 128
34  #define SEQ_NUM_FRAME_BUFFERS 30
35  #define SEQ_AUDIO_BUFFER_SIZE 882
36  #define SEQ_SAMPLE_RATE 22050
37  #define SEQ_FRAME_RATE 25
38 
39 
40  typedef struct TiertexSeqFrameBuffer {
41   int fill_size;
42   int data_size;
43   unsigned char *data;
44 } TiertexSeqFrameBuffer;
45 
46  typedef struct SeqDemuxContext {
47   int audio_stream_index;
48   int video_stream_index;
49   int current_frame_pts;
50   int current_frame_offs;
51   TiertexSeqFrameBuffer frame_buffers[SEQ_NUM_FRAME_BUFFERS];
52   int frame_buffers_count;
53   unsigned int current_audio_data_size;
54   unsigned int current_audio_data_offs;
55   unsigned int current_pal_data_size;
56   unsigned int current_pal_data_offs;
57   unsigned int current_video_data_size;
58   unsigned char *current_video_data_ptr;
59   int audio_buffer_full;
60 } SeqDemuxContext;
61 
62 
63  static int seq_probe(AVProbeData *p)
64 {
65  int i;
66 
67  if (p->buf_size < 258)
68  return 0;
69 
70  /* there's no real header in a .seq file, the only thing they have in common */
71  /* is the first 256 bytes of the file which are always filled with 0 */
72  for (i = 0; i < 256; i++)
73  if (p->buf[i])
74  return 0;
75 
76  if(p->buf[256]==0 && p->buf[257]==0)
77  return 0;
78 
79  /* only one fourth of the score since the previous check is too naive */
80  return AVPROBE_SCORE_MAX / 4;
81 }
82 
83  static int seq_init_frame_buffers(SeqDemuxContext *seq, AVIOContext *pb)
84 {
85  int i, sz;
86  TiertexSeqFrameBuffer *seq_buffer;
87 
88  avio_seek(pb, 256, SEEK_SET);
89 
90  for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) {
91  sz = avio_rl16(pb);
92  if (sz == 0)
93  break;
94  else {
95  seq_buffer = &seq->frame_buffers[i];
96  seq_buffer->fill_size = 0;
97  seq_buffer->data_size = sz;
98  seq_buffer->data = av_malloc(sz);
99  if (!seq_buffer->data)
100  return AVERROR(ENOMEM);
101  }
102  }
103  seq->frame_buffers_count = i;
104  return 0;
105 }
106 
107  static int seq_fill_buffer(SeqDemuxContext *seq, AVIOContext *pb, int buffer_num, unsigned int data_offs, int data_size)
108 {
109  TiertexSeqFrameBuffer *seq_buffer;
110 
111  if (buffer_num >= SEQ_NUM_FRAME_BUFFERS)
112  return AVERROR_INVALIDDATA;
113 
114  seq_buffer = &seq->frame_buffers[buffer_num];
115  if (seq_buffer->fill_size + data_size > seq_buffer->data_size || data_size <= 0)
116  return AVERROR_INVALIDDATA;
117 
118  avio_seek(pb, seq->current_frame_offs + data_offs, SEEK_SET);
119  if (avio_read(pb, seq_buffer->data + seq_buffer->fill_size, data_size) != data_size)
120  return AVERROR(EIO);
121 
122  seq_buffer->fill_size += data_size;
123  return 0;
124 }
125 
126  static int seq_parse_frame_data(SeqDemuxContext *seq, AVIOContext *pb)
127 {
128  unsigned int offset_table[4], buffer_num[4];
129  TiertexSeqFrameBuffer *seq_buffer;
130  int i, e, err;
131 
132  seq->current_frame_offs += SEQ_FRAME_SIZE;
133  avio_seek(pb, seq->current_frame_offs, SEEK_SET);
134 
135  /* sound data */
136  seq->current_audio_data_offs = avio_rl16(pb);
137  if (seq->current_audio_data_offs) {
138  seq->current_audio_data_size = SEQ_AUDIO_BUFFER_SIZE * 2;
139  } else {
140  seq->current_audio_data_size = 0;
141  }
142 
143  /* palette data */
144  seq->current_pal_data_offs = avio_rl16(pb);
145  if (seq->current_pal_data_offs) {
146  seq->current_pal_data_size = 768;
147  } else {
148  seq->current_pal_data_size = 0;
149  }
150 
151  /* video data */
152  for (i = 0; i < 4; i++)
153  buffer_num[i] = avio_r8(pb);
154 
155  for (i = 0; i < 4; i++)
156  offset_table[i] = avio_rl16(pb);
157 
158  for (i = 0; i < 3; i++) {
159  if (offset_table[i]) {
160  for (e = i + 1; e < 3 && offset_table[e] == 0; e++);
161  err = seq_fill_buffer(seq, pb, buffer_num[1 + i],
162  offset_table[i],
163  offset_table[e] - offset_table[i]);
164  if (err)
165  return err;
166  }
167  }
168 
169  if (buffer_num[0] != 255) {
170  if (buffer_num[0] >= SEQ_NUM_FRAME_BUFFERS)
171  return AVERROR_INVALIDDATA;
172 
173  seq_buffer = &seq->frame_buffers[buffer_num[0]];
174  seq->current_video_data_size = seq_buffer->fill_size;
175  seq->current_video_data_ptr = seq_buffer->data;
176  seq_buffer->fill_size = 0;
177  } else {
178  seq->current_video_data_size = 0;
179  seq->current_video_data_ptr = 0;
180  }
181 
182  return 0;
183 }
184 
185  static int seq_read_header(AVFormatContext *s)
186 {
187  int i, rc;
188  SeqDemuxContext *seq = s->priv_data;
189  AVIOContext *pb = s->pb;
190  AVStream *st;
191 
192  /* init internal buffers */
193  rc = seq_init_frame_buffers(seq, pb);
194  if (rc)
195  return rc;
196 
197  seq->current_frame_offs = 0;
198 
199  /* preload (no audio data, just buffer operations related data) */
200  for (i = 1; i <= 100; i++) {
201  rc = seq_parse_frame_data(seq, pb);
202  if (rc)
203  return rc;
204  }
205 
206  seq->current_frame_pts = 0;
207 
208  seq->audio_buffer_full = 0;
209 
210  /* initialize the video decoder stream */
211  st = avformat_new_stream(s, NULL);
212  if (!st)
213  return AVERROR(ENOMEM);
214 
215  avpriv_set_pts_info(st, 32, 1, SEQ_FRAME_RATE);
216  seq->video_stream_index = st->index;
217  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
218  st->codec->codec_id = AV_CODEC_ID_TIERTEXSEQVIDEO;
219  st->codec->codec_tag = 0; /* no fourcc */
220  st->codec->width = SEQ_FRAME_W;
221  st->codec->height = SEQ_FRAME_H;
222 
223  /* initialize the audio decoder stream */
224  st = avformat_new_stream(s, NULL);
225  if (!st)
226  return AVERROR(ENOMEM);
227 
228  st->start_time = 0;
229  avpriv_set_pts_info(st, 32, 1, SEQ_SAMPLE_RATE);
230  seq->audio_stream_index = st->index;
231  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
232  st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
233  st->codec->codec_tag = 0; /* no tag */
234  st->codec->channels = 1;
235  st->codec->channel_layout = AV_CH_LAYOUT_MONO;
236  st->codec->sample_rate = SEQ_SAMPLE_RATE;
237  st->codec->bits_per_coded_sample = 16;
238  st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels;
239  st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample / 8;
240 
241  return 0;
242 }
243 
244  static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
245 {
246  int rc;
247  SeqDemuxContext *seq = s->priv_data;
248  AVIOContext *pb = s->pb;
249 
250  if (!seq->audio_buffer_full) {
251  rc = seq_parse_frame_data(seq, pb);
252  if (rc)
253  return rc;
254 
255  /* video packet */
256  if (seq->current_pal_data_size + seq->current_video_data_size != 0) {
257  if (av_new_packet(pkt, 1 + seq->current_pal_data_size + seq->current_video_data_size))
258  return AVERROR(ENOMEM);
259 
260  pkt->data[0] = 0;
261  if (seq->current_pal_data_size) {
262  pkt->data[0] |= 1;
263  avio_seek(pb, seq->current_frame_offs + seq->current_pal_data_offs, SEEK_SET);
264  if (avio_read(pb, &pkt->data[1], seq->current_pal_data_size) != seq->current_pal_data_size)
265  return AVERROR(EIO);
266  }
267  if (seq->current_video_data_size) {
268  pkt->data[0] |= 2;
269  memcpy(&pkt->data[1 + seq->current_pal_data_size],
270  seq->current_video_data_ptr,
271  seq->current_video_data_size);
272  }
273  pkt->stream_index = seq->video_stream_index;
274  pkt->pts = seq->current_frame_pts;
275 
276  /* sound buffer will be processed on next read_packet() call */
277  seq->audio_buffer_full = 1;
278  return 0;
279  }
280  }
281 
282  /* audio packet */
283  if (seq->current_audio_data_offs == 0) /* end of data reached */
284  return AVERROR(EIO);
285 
286  avio_seek(pb, seq->current_frame_offs + seq->current_audio_data_offs, SEEK_SET);
287  rc = av_get_packet(pb, pkt, seq->current_audio_data_size);
288  if (rc < 0)
289  return rc;
290 
291  pkt->stream_index = seq->audio_stream_index;
292  seq->current_frame_pts++;
293 
294  seq->audio_buffer_full = 0;
295  return 0;
296 }
297 
298  static int seq_read_close(AVFormatContext *s)
299 {
300  int i;
301  SeqDemuxContext *seq = s->priv_data;
302 
303  for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++)
304  av_freep(&seq->frame_buffers[i].data);
305 
306  return 0;
307 }
308 
309  AVInputFormat ff_tiertexseq_demuxer = {
310  .name = "tiertexseq",
311  .long_name = NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ"),
312  .priv_data_size = sizeof(SeqDemuxContext),
313  .read_probe = seq_probe,
314  .read_header = seq_read_header,
315  .read_packet = seq_read_packet,
316  .read_close = seq_read_close,
317 };
SeqDemuxContext::current_audio_data_size
unsigned int current_audio_data_size
Definition: tiertexseq.c:53
NULL
#define NULL
Definition: coverity.c:32
s
const char * s
Definition: avisynth_c.h:631
AVIOContext
Bytestream IO Context.
Definition: avio.h:111
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
seq_probe
static int seq_probe(AVProbeData *p)
Definition: tiertexseq.c:63
ff_tiertexseq_demuxer
AVInputFormat ff_tiertexseq_demuxer
Definition: tiertexseq.c:309
SeqDemuxContext::audio_buffer_full
int audio_buffer_full
Definition: tiertexseq.c:59
AVCodecContext::bit_rate
int64_t bit_rate
the average bitrate
Definition: avcodec.h:1597
avpriv_set_pts_info
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:4149
AVStream::index
int index
stream index in AVFormatContext
Definition: avformat.h:878
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:208
SEQ_AUDIO_BUFFER_SIZE
#define SEQ_AUDIO_BUFFER_SIZE
Definition: tiertexseq.c:35
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
AVCodecContext::block_align
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2324
SeqDemuxContext::current_audio_data_offs
unsigned int current_audio_data_offs
Definition: tiertexseq.c:54
AVFormatContext
Format I/O context.
Definition: avformat.h:1314
SeqDemuxContext::video_stream_index
int video_stream_index
Definition: tiertexseq.c:48
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
SEQ_FRAME_W
#define SEQ_FRAME_W
Definition: tiertexseq.c:32
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3805
AVPacket::data
uint8_t * data
Definition: avcodec.h:1467
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
av_get_packet
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:252
AV_CODEC_ID_TIERTEXSEQVIDEO
Definition: avcodec.h:202
AVCodecContext::bits_per_coded_sample
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2917
SeqDemuxContext::current_pal_data_size
unsigned int current_pal_data_size
Definition: tiertexseq.c:55
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:545
seq_parse_frame_data
static int seq_parse_frame_data(SeqDemuxContext *seq, AVIOContext *pb)
Definition: tiertexseq.c:126
av_new_packet
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
SEQ_NUM_FRAME_BUFFERS
#define SEQ_NUM_FRAME_BUFFERS
Definition: tiertexseq.c:34
seq_fill_buffer
static int seq_fill_buffer(SeqDemuxContext *seq, AVIOContext *pb, int buffer_num, unsigned int data_offs, int data_size)
Definition: tiertexseq.c:107
SeqDemuxContext::current_frame_offs
int current_frame_offs
Definition: tiertexseq.c:50
AVERROR
#define AVERROR(e)
Definition: error.h:43
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
AVMEDIA_TYPE_AUDIO
Definition: avutil.h:194
seq_read_packet
static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: tiertexseq.c:244
AVCodecContext::channel_layout
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2338
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:536
AVStream::codec
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:896
AVProbeData::buf_size
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:463
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:462
SeqDemuxContext::current_frame_pts
int current_frame_pts
Definition: tiertexseq.c:49
SeqDemuxContext::frame_buffers_count
int frame_buffers_count
Definition: tiertexseq.c:52
channel_layout.h
audio channel layout utility functions
SeqDemuxContext::current_pal_data_offs
unsigned int current_pal_data_offs
Definition: tiertexseq.c:56
read_probe
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:1711
SeqDemuxContext::current_video_data_ptr
unsigned char * current_video_data_ptr
Definition: tiertexseq.c:58
SeqDemuxContext::frame_buffers
TiertexSeqFrameBuffer frame_buffers[SEQ_NUM_FRAME_BUFFERS]
Definition: tiertexseq.c:51
AVCodecContext::height
int height
Definition: avcodec.h:1711
AV_CODEC_ID_PCM_S16BE
Definition: avcodec.h:323
SEQ_FRAME_RATE
#define SEQ_FRAME_RATE
Definition: tiertexseq.c:37
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:638
AVStream
Stream structure.
Definition: avformat.h:877
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVCodecContext::codec_type
enum AVMediaType codec_type
Definition: avcodec.h:1540
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:1549
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:2287
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1356
seq_read_close
static int seq_read_close(AVFormatContext *s)
Definition: tiertexseq.c:298
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1564
SeqDemuxContext::current_video_data_size
unsigned int current_video_data_size
Definition: tiertexseq.c:57
SeqDemuxContext::audio_stream_index
int audio_stream_index
Definition: tiertexseq.c:47
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:460
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:472
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:651
avformat.h
Main libavformat public API header.
TiertexSeqFrameBuffer::data
unsigned char * data
Definition: tiertexseq.c:43
SEQ_SAMPLE_RATE
#define SEQ_SAMPLE_RATE
Definition: tiertexseq.c:36
AVStream::start_time
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:929
offset_table
static const uint8_t offset_table[]
Definition: escape130.c:40
AVCodecContext::channels
int channels
number of audio channels
Definition: avcodec.h:2288
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1342
SEQ_FRAME_SIZE
#define SEQ_FRAME_SIZE
Definition: tiertexseq.c:31
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:661
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:193
AVPacket::stream_index
int stream_index
Definition: avcodec.h:1469
AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_MONO
Definition: channel_layout.h:85
seq_read_header
static int seq_read_header(AVFormatContext *s)
Definition: tiertexseq.c:185
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1444
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1460
seq_init_frame_buffers
static int seq_init_frame_buffers(SeqDemuxContext *seq, AVIOContext *pb)
Definition: tiertexseq.c:83
SEQ_FRAME_H
#define SEQ_FRAME_H
Definition: tiertexseq.c:33
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