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 "demux.h"
30 #include "internal.h"
31 
32  #define SEQ_FRAME_SIZE 6144
33  #define SEQ_FRAME_W 256
34  #define SEQ_FRAME_H 128
35  #define SEQ_NUM_FRAME_BUFFERS 30
36  #define SEQ_AUDIO_BUFFER_SIZE 882
37  #define SEQ_SAMPLE_RATE 22050
38  #define SEQ_FRAME_RATE 25
39 
40 
41  typedef struct TiertexSeqFrameBuffer {
42   int fill_size;
43   int data_size;
44   unsigned char *data;
45 } TiertexSeqFrameBuffer;
46 
47  typedef struct SeqDemuxContext {
48   int audio_stream_index;
49   int video_stream_index;
50   int current_frame_pts;
51   int current_frame_offs;
52   TiertexSeqFrameBuffer frame_buffers[SEQ_NUM_FRAME_BUFFERS];
53   int frame_buffers_count;
54   unsigned int current_audio_data_size;
55   unsigned int current_audio_data_offs;
56   unsigned int current_pal_data_size;
57   unsigned int current_pal_data_offs;
58   unsigned int current_video_data_size;
59   unsigned char *current_video_data_ptr;
60   int audio_buffer_full;
61 } SeqDemuxContext;
62 
63 
64  static int seq_probe(const AVProbeData *p)
65 {
66  int i;
67 
68  if (p->buf_size < 258)
69  return 0;
70 
71  /* there's no real header in a .seq file, the only thing they have in common */
72  /* is the first 256 bytes of the file which are always filled with 0 */
73  for (i = 0; i < 256; i++)
74  if (p->buf[i])
75  return 0;
76 
77  if(p->buf[256]==0 && p->buf[257]==0)
78  return 0;
79 
80  /* only one fourth of the score since the previous check is too naive */
81  return AVPROBE_SCORE_MAX / 4;
82 }
83 
84  static int seq_init_frame_buffers(SeqDemuxContext *seq, AVIOContext *pb)
85 {
86  int i, sz;
87  TiertexSeqFrameBuffer *seq_buffer;
88 
89  avio_seek(pb, 256, SEEK_SET);
90 
91  for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) {
92  sz = avio_rl16(pb);
93  if (sz == 0)
94  break;
95  else {
96  seq_buffer = &seq->frame_buffers[i];
97  seq_buffer->fill_size = 0;
98  seq_buffer->data_size = sz;
99  seq_buffer->data = av_malloc(sz);
100  if (!seq_buffer->data)
101  return AVERROR(ENOMEM);
102  }
103  }
104  seq->frame_buffers_count = i;
105  return 0;
106 }
107 
108  static int seq_fill_buffer(SeqDemuxContext *seq, AVIOContext *pb, int buffer_num, unsigned int data_offs, int data_size)
109 {
110  TiertexSeqFrameBuffer *seq_buffer;
111 
112  if (buffer_num >= SEQ_NUM_FRAME_BUFFERS)
113  return AVERROR_INVALIDDATA;
114 
115  seq_buffer = &seq->frame_buffers[buffer_num];
116  if (seq_buffer->fill_size + data_size > seq_buffer->data_size || data_size <= 0)
117  return AVERROR_INVALIDDATA;
118 
119  avio_seek(pb, seq->current_frame_offs + data_offs, SEEK_SET);
120  if (avio_read(pb, seq_buffer->data + seq_buffer->fill_size, data_size) != data_size)
121  return AVERROR(EIO);
122 
123  seq_buffer->fill_size += data_size;
124  return 0;
125 }
126 
127  static int seq_parse_frame_data(SeqDemuxContext *seq, AVIOContext *pb)
128 {
129  unsigned int offset_table[4], buffer_num[4];
130  TiertexSeqFrameBuffer *seq_buffer;
131  int i, e, err;
132 
133  seq->current_frame_offs += SEQ_FRAME_SIZE;
134  avio_seek(pb, seq->current_frame_offs, SEEK_SET);
135 
136  /* sound data */
137  seq->current_audio_data_offs = avio_rl16(pb);
138  if (seq->current_audio_data_offs) {
139  seq->current_audio_data_size = SEQ_AUDIO_BUFFER_SIZE * 2;
140  } else {
141  seq->current_audio_data_size = 0;
142  }
143 
144  /* palette data */
145  seq->current_pal_data_offs = avio_rl16(pb);
146  if (seq->current_pal_data_offs) {
147  seq->current_pal_data_size = 768;
148  } else {
149  seq->current_pal_data_size = 0;
150  }
151 
152  /* video data */
153  for (i = 0; i < 4; i++)
154  buffer_num[i] = avio_r8(pb);
155 
156  for (i = 0; i < 4; i++)
157  offset_table[i] = avio_rl16(pb);
158 
159  for (i = 0; i < 3; i++) {
160  if (offset_table[i]) {
161  for (e = i + 1; e < 3 && offset_table[e] == 0; e++);
162  err = seq_fill_buffer(seq, pb, buffer_num[1 + i],
163  offset_table[i],
164  offset_table[e] - offset_table[i]);
165  if (err)
166  return err;
167  }
168  }
169 
170  if (buffer_num[0] != 255) {
171  if (buffer_num[0] >= SEQ_NUM_FRAME_BUFFERS)
172  return AVERROR_INVALIDDATA;
173 
174  seq_buffer = &seq->frame_buffers[buffer_num[0]];
175  seq->current_video_data_size = seq_buffer->fill_size;
176  seq->current_video_data_ptr = seq_buffer->data;
177  seq_buffer->fill_size = 0;
178  } else {
179  seq->current_video_data_size = 0;
180  seq->current_video_data_ptr = 0;
181  }
182 
183  return 0;
184 }
185 
186  static int seq_read_close(AVFormatContext *s)
187 {
188  int i;
189  SeqDemuxContext *seq = s->priv_data;
190 
191  for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++)
192  av_freep(&seq->frame_buffers[i].data);
193 
194  return 0;
195 }
196 
197  static int seq_read_header(AVFormatContext *s)
198 {
199  int i, rc;
200  SeqDemuxContext *seq = s->priv_data;
201  AVIOContext *pb = s->pb;
202  AVStream *st;
203 
204  /* init internal buffers */
205  rc = seq_init_frame_buffers(seq, pb);
206  if (rc < 0)
207  return rc;
208 
209  seq->current_frame_offs = 0;
210 
211  /* preload (no audio data, just buffer operations related data) */
212  for (i = 1; i <= 100; i++) {
213  rc = seq_parse_frame_data(seq, pb);
214  if (rc < 0)
215  return rc;
216  }
217 
218  seq->current_frame_pts = 0;
219 
220  seq->audio_buffer_full = 0;
221 
222  /* initialize the video decoder stream */
223  st = avformat_new_stream(s, NULL);
224  if (!st)
225  return AVERROR(ENOMEM);
226 
227  avpriv_set_pts_info(st, 32, 1, SEQ_FRAME_RATE);
228  seq->video_stream_index = st->index;
229  st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
230  st->codecpar->codec_id = AV_CODEC_ID_TIERTEXSEQVIDEO;
231  st->codecpar->codec_tag = 0; /* no fourcc */
232  st->codecpar->width = SEQ_FRAME_W;
233  st->codecpar->height = SEQ_FRAME_H;
234 
235  /* initialize the audio decoder stream */
236  st = avformat_new_stream(s, NULL);
237  if (!st)
238  return AVERROR(ENOMEM);
239 
240  st->start_time = 0;
241  avpriv_set_pts_info(st, 32, 1, SEQ_SAMPLE_RATE);
242  seq->audio_stream_index = st->index;
243  st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
244  st->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
245  st->codecpar->codec_tag = 0; /* no tag */
246  st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
247  st->codecpar->sample_rate = SEQ_SAMPLE_RATE;
248  st->codecpar->bits_per_coded_sample = 16;
249  st->codecpar->bit_rate = st->codecpar->sample_rate * st->codecpar->bits_per_coded_sample * st->codecpar->ch_layout.nb_channels;
250  st->codecpar->block_align = st->codecpar->ch_layout.nb_channels * st->codecpar->bits_per_coded_sample / 8;
251 
252  return 0;
253 }
254 
255  static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
256 {
257  int rc;
258  SeqDemuxContext *seq = s->priv_data;
259  AVIOContext *pb = s->pb;
260 
261  if (!seq->audio_buffer_full) {
262  rc = seq_parse_frame_data(seq, pb);
263  if (rc)
264  return rc;
265 
266  /* video packet */
267  if (seq->current_pal_data_size + seq->current_video_data_size != 0) {
268  rc = av_new_packet(pkt, 1 + seq->current_pal_data_size
269  + seq->current_video_data_size);
270  if (rc < 0)
271  return rc;
272 
273  pkt->data[0] = 0;
274  if (seq->current_pal_data_size) {
275  pkt->data[0] |= 1;
276  avio_seek(pb, seq->current_frame_offs + seq->current_pal_data_offs, SEEK_SET);
277  if (avio_read(pb, &pkt->data[1], seq->current_pal_data_size) != seq->current_pal_data_size)
278  return AVERROR(EIO);
279  }
280  if (seq->current_video_data_size) {
281  pkt->data[0] |= 2;
282  memcpy(&pkt->data[1 + seq->current_pal_data_size],
283  seq->current_video_data_ptr,
284  seq->current_video_data_size);
285  }
286  pkt->stream_index = seq->video_stream_index;
287  pkt->pts = seq->current_frame_pts;
288 
289  /* sound buffer will be processed on next read_packet() call */
290  seq->audio_buffer_full = 1;
291  return 0;
292  }
293  }
294 
295  /* audio packet */
296  if (seq->current_audio_data_offs == 0) /* end of data reached */
297  return AVERROR(EIO);
298 
299  avio_seek(pb, seq->current_frame_offs + seq->current_audio_data_offs, SEEK_SET);
300  rc = av_get_packet(pb, pkt, seq->current_audio_data_size);
301  if (rc < 0)
302  return rc;
303 
304  pkt->stream_index = seq->audio_stream_index;
305  seq->current_frame_pts++;
306 
307  seq->audio_buffer_full = 0;
308  return 0;
309 }
310 
311  const FFInputFormat ff_tiertexseq_demuxer = {
312  .p.name = "tiertexseq",
313  .p.long_name = NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ"),
314  .priv_data_size = sizeof(SeqDemuxContext),
315  .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
316  .read_probe = seq_probe,
317  .read_header = seq_read_header,
318  .read_packet = seq_read_packet,
319  .read_close = seq_read_close,
320 };
seq_probe
static int seq_probe(const AVProbeData *p)
Definition: tiertexseq.c:64
AVERROR
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
seq_read_packet
static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: tiertexseq.c:255
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:51
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
SEQ_FRAME_RATE
#define SEQ_FRAME_RATE
Definition: tiertexseq.c:38
SeqDemuxContext::current_frame_offs
int current_frame_offs
Definition: tiertexseq.c:51
AVPacket::data
uint8_t * data
Definition: packet.h:522
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:59
AVProbeData::buf_size
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:454
seq_read_close
static int seq_read_close(AVFormatContext *s)
Definition: tiertexseq.c:186
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:313
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:463
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: avformat.c:853
AV_CODEC_ID_PCM_S16BE
@ AV_CODEC_ID_PCM_S16BE
Definition: codec_id.h:329
SeqDemuxContext::current_audio_data_offs
unsigned int current_audio_data_offs
Definition: tiertexseq.c:55
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:143
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:713
SEQ_SAMPLE_RATE
#define SEQ_SAMPLE_RATE
Definition: tiertexseq.c:37
pkt
AVPacket * pkt
Definition: movenc.c:59
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_read_callback.c:41
s
#define s(width, name)
Definition: cbs_vp9.c:198
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:98
SeqDemuxContext::current_frame_pts
int current_frame_pts
Definition: tiertexseq.c:50
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:553
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:453
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:134
SEQ_FRAME_SIZE
#define SEQ_FRAME_SIZE
Definition: tiertexseq.c:32
AV_CODEC_ID_TIERTEXSEQVIDEO
@ AV_CODEC_ID_TIERTEXSEQVIDEO
Definition: codec_id.h:147
SeqDemuxContext::audio_buffer_full
int audio_buffer_full
Definition: tiertexseq.c:60
FF_INFMT_FLAG_INIT_CLEANUP
#define FF_INFMT_FLAG_INIT_CLEANUP
For an FFInputFormat with this flag set read_close() needs to be called by the caller upon read_heade...
Definition: demux.h:35
AVFormatContext
Format I/O context.
Definition: avformat.h:1255
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:766
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:550
NULL
#define NULL
Definition: coverity.c:32
SeqDemuxContext::audio_stream_index
int audio_stream_index
Definition: tiertexseq.c:48
seq_read_header
static int seq_read_header(AVFormatContext *s)
Definition: tiertexseq.c:197
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:451
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:180
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:184
SeqDemuxContext::frame_buffers_count
int frame_buffers_count
Definition: tiertexseq.c:53
AVIOContext
Bytestream IO Context.
Definition: avio.h:160
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:106
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:303
TiertexSeqFrameBuffer::data_size
int data_size
Definition: tiertexseq.c:43
seq_init_frame_buffers
static int seq_init_frame_buffers(SeqDemuxContext *seq, AVIOContext *pb)
Definition: tiertexseq.c:84
SEQ_FRAME_H
#define SEQ_FRAME_H
Definition: tiertexseq.c:34
SEQ_AUDIO_BUFFER_SIZE
#define SEQ_AUDIO_BUFFER_SIZE
Definition: tiertexseq.c:36
FFInputFormat::p
AVInputFormat p
The public AVInputFormat.
Definition: demux.h:41
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:602
SEQ_FRAME_W
#define SEQ_FRAME_W
Definition: tiertexseq.c:33
TiertexSeqFrameBuffer::data
unsigned char * data
Definition: tiertexseq.c:44
ff_tiertexseq_demuxer
const FFInputFormat ff_tiertexseq_demuxer
Definition: tiertexseq.c:311
TiertexSeqFrameBuffer
Definition: tiertexseq.c:41
offset_table
static const uint8_t offset_table[]
Definition: escape130.c:42
SeqDemuxContext::current_video_data_size
unsigned int current_video_data_size
Definition: tiertexseq.c:58
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:255
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:515
AVCodecParameters::height
int height
Definition: codec_par.h:135
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:191
SeqDemuxContext
Definition: tiertexseq.c:47
demux.h
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:103
AVStream
Stream structure.
Definition: avformat.h:743
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:230
seq_parse_frame_data
static int seq_parse_frame_data(SeqDemuxContext *seq, AVIOContext *pb)
Definition: tiertexseq.c:127
avformat.h
SEQ_NUM_FRAME_BUFFERS
#define SEQ_NUM_FRAME_BUFFERS
Definition: tiertexseq.c:35
SeqDemuxContext::current_pal_data_offs
unsigned int current_pal_data_offs
Definition: tiertexseq.c:57
SeqDemuxContext::current_video_data_ptr
unsigned char * current_video_data_ptr
Definition: tiertexseq.c:59
AVStream::index
int index
stream index in AVFormatContext
Definition: avformat.h:749
channel_layout.h
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:611
SeqDemuxContext::frame_buffers
TiertexSeqFrameBuffer frame_buffers[SEQ_NUM_FRAME_BUFFERS]
Definition: tiertexseq.c:52
AVPacket::stream_index
int stream_index
Definition: packet.h:524
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
read_probe
static int read_probe(const AVProbeData *p)
Definition: cdg.c:30
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:110
AV_CHANNEL_LAYOUT_MONO
#define AV_CHANNEL_LAYOUT_MONO
Definition: channel_layout.h:378
SeqDemuxContext::video_stream_index
int video_stream_index
Definition: tiertexseq.c:49
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:108
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
AVPacket
This structure stores compressed data.
Definition: packet.h:499
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
SeqDemuxContext::current_audio_data_size
unsigned int current_audio_data_size
Definition: tiertexseq.c:54
FFInputFormat
Definition: demux.h:37
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:97
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
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:792
SeqDemuxContext::current_pal_data_size
unsigned int current_pal_data_size
Definition: tiertexseq.c:56
TiertexSeqFrameBuffer::fill_size
int fill_size
Definition: tiertexseq.c:42
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