FFmpeg
paf.c
Go to the documentation of this file.
1 /*
2  * Packed Animation File demuxer
3  * Copyright (c) 2012 Paul B Mahol
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 #include "libavutil/channel_layout.h"
23 #include "libavcodec/paf.h"
24 #include "avformat.h"
25 #include "internal.h"
26 
27 #define MAGIC "Packed Animation File V1.0\n(c) 1992-96 Amazing Studio\x0a\x1a"
28 
29 typedef struct PAFDemuxContext {
30  uint32_t buffer_size;
31  uint32_t frame_blks;
32  uint32_t nb_frames;
33  uint32_t start_offset;
34  uint32_t preload_count;
35  uint32_t max_video_blks;
36  uint32_t max_audio_blks;
37 
38  uint32_t current_frame;
39  uint32_t current_frame_count;
40  uint32_t current_frame_block;
41 
42  uint32_t *blocks_count_table;
43  uint32_t *frames_offset_table;
44  uint32_t *blocks_offset_table;
45 
46  uint8_t *video_frame;
47  int video_size;
48 
49  uint8_t *audio_frame;
50  uint8_t *temp_audio_frame;
51  int audio_size;
52 
53  int got_audio;
54 } PAFDemuxContext;
55 
56 static int read_probe(const AVProbeData *p)
57 {
58  if ((p->buf_size >= strlen(MAGIC)) &&
59  !memcmp(p->buf, MAGIC, strlen(MAGIC)))
60  return AVPROBE_SCORE_MAX;
61  return 0;
62 }
63 
64 static int read_close(AVFormatContext *s)
65 {
66  PAFDemuxContext *p = s->priv_data;
67 
68  av_freep(&p->blocks_count_table);
69  av_freep(&p->frames_offset_table);
70  av_freep(&p->blocks_offset_table);
71  av_freep(&p->video_frame);
72  av_freep(&p->audio_frame);
73  av_freep(&p->temp_audio_frame);
74 
75  return 0;
76 }
77 
78 static int read_table(AVFormatContext *s, uint32_t *table, uint32_t count)
79 {
80  int i;
81 
82  for (i = 0; i < count; i++) {
83  if (avio_feof(s->pb))
84  return AVERROR_INVALIDDATA;
85  table[i] = avio_rl32(s->pb);
86  }
87 
88  avio_skip(s->pb, 4 * (FFALIGN(count, 512) - count));
89  return 0;
90 }
91 
92 static int read_header(AVFormatContext *s)
93 {
94  PAFDemuxContext *p = s->priv_data;
95  AVIOContext *pb = s->pb;
96  AVStream *ast, *vst;
97  int ret = 0;
98 
99  avio_skip(pb, 132);
100 
101  vst = avformat_new_stream(s, 0);
102  if (!vst)
103  return AVERROR(ENOMEM);
104 
105  vst->start_time = 0;
106  vst->nb_frames =
107  vst->duration =
108  p->nb_frames = avio_rl32(pb);
109  avio_skip(pb, 4);
110 
111  vst->codecpar->width = avio_rl32(pb);
112  vst->codecpar->height = avio_rl32(pb);
113  avio_skip(pb, 4);
114 
115  vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
116  vst->codecpar->codec_tag = 0;
117  vst->codecpar->codec_id = AV_CODEC_ID_PAF_VIDEO;
118  avpriv_set_pts_info(vst, 64, 1, 10);
119 
120  ast = avformat_new_stream(s, 0);
121  if (!ast)
122  return AVERROR(ENOMEM);
123 
124  ast->start_time = 0;
125  ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
126  ast->codecpar->codec_tag = 0;
127  ast->codecpar->codec_id = AV_CODEC_ID_PAF_AUDIO;
128  ast->codecpar->channels = 2;
129  ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
130  ast->codecpar->sample_rate = 22050;
131  avpriv_set_pts_info(ast, 64, 1, 22050);
132 
133  p->buffer_size = avio_rl32(pb);
134  p->preload_count = avio_rl32(pb);
135  p->frame_blks = avio_rl32(pb);
136  p->start_offset = avio_rl32(pb);
137  p->max_video_blks = avio_rl32(pb);
138  p->max_audio_blks = avio_rl32(pb);
139 
140  if (avio_feof(pb))
141  return AVERROR_INVALIDDATA;
142 
143  if (p->buffer_size < 175 ||
144  p->max_audio_blks < 2 ||
145  p->max_video_blks < 1 ||
146  p->frame_blks < 1 ||
147  p->nb_frames < 1 ||
148  p->preload_count < 1 ||
149  p->buffer_size > 2048 ||
150  p->max_video_blks > 2048 ||
151  p->max_audio_blks > 2048 ||
152  p->nb_frames > INT_MAX / sizeof(uint32_t) ||
153  p->frame_blks > INT_MAX / sizeof(uint32_t))
154  return AVERROR_INVALIDDATA;
155 
156  p->blocks_count_table = av_mallocz(p->nb_frames *
157  sizeof(*p->blocks_count_table));
158  p->frames_offset_table = av_mallocz(p->nb_frames *
159  sizeof(*p->frames_offset_table));
160  p->blocks_offset_table = av_mallocz(p->frame_blks *
161  sizeof(*p->blocks_offset_table));
162 
163  p->video_size = p->max_video_blks * p->buffer_size;
164  p->video_frame = av_mallocz(p->video_size);
165 
166  p->audio_size = p->max_audio_blks * p->buffer_size;
167  p->audio_frame = av_mallocz(p->audio_size);
168  p->temp_audio_frame = av_mallocz(p->audio_size);
169 
170  if (!p->blocks_count_table ||
171  !p->frames_offset_table ||
172  !p->blocks_offset_table ||
173  !p->video_frame ||
174  !p->audio_frame ||
175  !p->temp_audio_frame) {
176  ret = AVERROR(ENOMEM);
177  goto fail;
178  }
179 
180  avio_seek(pb, p->buffer_size, SEEK_SET);
181 
182  ret = read_table(s, p->blocks_count_table, p->nb_frames);
183  if (ret < 0)
184  goto fail;
185  ret = read_table(s, p->frames_offset_table, p->nb_frames);
186  if (ret < 0)
187  goto fail;
188  ret = read_table(s, p->blocks_offset_table, p->frame_blks);
189  if (ret < 0)
190  goto fail;
191 
192  p->got_audio = 0;
193  p->current_frame = 0;
194  p->current_frame_block = 0;
195 
196  avio_seek(pb, p->start_offset, SEEK_SET);
197 
198  return 0;
199 
200 fail:
201  read_close(s);
202 
203  return ret;
204 }
205 
206 static int read_packet(AVFormatContext *s, AVPacket *pkt)
207 {
208  PAFDemuxContext *p = s->priv_data;
209  AVIOContext *pb = s->pb;
210  uint32_t count, offset;
211  int size, i;
212 
213  if (p->current_frame >= p->nb_frames)
214  return AVERROR_EOF;
215 
216  if (avio_feof(pb))
217  return AVERROR_EOF;
218 
219  if (p->got_audio) {
220  if (av_new_packet(pkt, p->audio_size) < 0)
221  return AVERROR(ENOMEM);
222 
223  memcpy(pkt->data, p->temp_audio_frame, p->audio_size);
224  pkt->duration = PAF_SOUND_SAMPLES * (p->audio_size / PAF_SOUND_FRAME_SIZE);
225  pkt->flags |= AV_PKT_FLAG_KEY;
226  pkt->stream_index = 1;
227  p->got_audio = 0;
228  return pkt->size;
229  }
230 
231  count = (p->current_frame == 0) ? p->preload_count
232  : p->blocks_count_table[p->current_frame - 1];
233  for (i = 0; i < count; i++) {
234  if (p->current_frame_block >= p->frame_blks)
235  return AVERROR_INVALIDDATA;
236 
237  offset = p->blocks_offset_table[p->current_frame_block] & ~(1U << 31);
238  if (p->blocks_offset_table[p->current_frame_block] & (1U << 31)) {
239  if (offset > p->audio_size - p->buffer_size)
240  return AVERROR_INVALIDDATA;
241 
242  avio_read(pb, p->audio_frame + offset, p->buffer_size);
243  if (offset == (p->max_audio_blks - 2) * p->buffer_size) {
244  memcpy(p->temp_audio_frame, p->audio_frame, p->audio_size);
245  p->got_audio = 1;
246  }
247  } else {
248  if (offset > p->video_size - p->buffer_size)
249  return AVERROR_INVALIDDATA;
250 
251  avio_read(pb, p->video_frame + offset, p->buffer_size);
252  }
253  p->current_frame_block++;
254  }
255 
256  if (p->frames_offset_table[p->current_frame] >= p->video_size)
257  return AVERROR_INVALIDDATA;
258 
259  size = p->video_size - p->frames_offset_table[p->current_frame];
260 
261  if (av_new_packet(pkt, size) < 0)
262  return AVERROR(ENOMEM);
263 
264  pkt->stream_index = 0;
265  pkt->duration = 1;
266  memcpy(pkt->data, p->video_frame + p->frames_offset_table[p->current_frame], size);
267  if (pkt->data[0] & 0x20)
268  pkt->flags |= AV_PKT_FLAG_KEY;
269  p->current_frame++;
270 
271  return pkt->size;
272 }
273 
274 AVInputFormat ff_paf_demuxer = {
275  .name = "paf",
276  .long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File"),
277  .priv_data_size = sizeof(PAFDemuxContext),
278  .read_probe = read_probe,
279  .read_header = read_header,
280  .read_packet = read_packet,
281  .read_close = read_close,
282 };
PAFDemuxContext::frame_blks
uint32_t frame_blks
Definition: paf.c:31
read_header
static int read_header(AVFormatContext *s)
Definition: paf.c:92
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
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4480
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3953
read_probe
static int read_probe(const AVProbeData *p)
Definition: paf.c:56
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
PAFDemuxContext::frames_offset_table
uint32_t * frames_offset_table
Definition: paf.c:43
PAF_SOUND_FRAME_SIZE
#define PAF_SOUND_FRAME_SIZE
Definition: paf.h:26
count
void INT64 INT64 count
Definition: avisynth_c.h:767
PAFDemuxContext::current_frame_count
uint32_t current_frame_count
Definition: paf.c:39
ff_paf_demuxer
AVInputFormat ff_paf_demuxer
Definition: paf.c:274
AVPacket::data
uint8_t * data
Definition: avcodec.h:1477
PAFDemuxContext::current_frame_block
uint32_t current_frame_block
Definition: paf.c:40
table
static const uint16_t table[]
Definition: prosumer.c:206
read_close
static int read_close(AVFormatContext *s)
Definition: paf.c:64
PAFDemuxContext::blocks_count_table
uint32_t * blocks_count_table
Definition: paf.c:42
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1495
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3961
AVProbeData::buf_size
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:449
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1509
paf.h
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
PAFDemuxContext::max_audio_blks
uint32_t max_audio_blks
Definition: paf.c:36
AVCodecParameters::channels
int channels
Audio only.
Definition: avcodec.h:4063
U
#define U(x)
Definition: vp56_arith.h:37
fail
#define fail()
Definition: checkasm.h:120
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:919
PAFDemuxContext::nb_frames
uint32_t nb_frames
Definition: paf.c:32
AV_CH_LAYOUT_STEREO
#define AV_CH_LAYOUT_STEREO
Definition: channel_layout.h:86
AVInputFormat
Definition: avformat.h:640
PAFDemuxContext::blocks_offset_table
uint32_t * blocks_offset_table
Definition: paf.c:44
s
#define s(width, name)
Definition: cbs_vp9.c:257
PAFDemuxContext::max_video_blks
uint32_t max_video_blks
Definition: paf.c:35
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
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: avcodec.h:4023
PAFDemuxContext::video_size
int video_size
Definition: paf.c:47
PAFDemuxContext::got_audio
int got_audio
Definition: paf.c:53
AVFormatContext
Format I/O context.
Definition: avformat.h:1342
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1017
PAFDemuxContext::current_frame
uint32_t current_frame
Definition: paf.c:38
PAFDemuxContext
Definition: paf.c:29
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
PAFDemuxContext::video_frame
uint8_t * video_frame
Definition: paf.c:46
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: avcodec.h:4067
AVStream::nb_frames
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:921
for
for(j=16;j >0;--j)
Definition: h264pred_template.c:469
read_packet
static int read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: paf.c:206
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:769
PAFDemuxContext::temp_audio_frame
uint8_t * temp_audio_frame
Definition: paf.c:50
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
AVPacket::size
int size
Definition: avcodec.h:1478
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:188
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:4910
size
int size
Definition: twinvq_data.h:11134
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1483
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
PAF_SOUND_SAMPLES
#define PAF_SOUND_SAMPLES
Definition: paf.h:25
AVCodecParameters::height
int height
Definition: avcodec.h:4024
AV_CODEC_ID_PAF_VIDEO
@ AV_CODEC_ID_PAF_VIDEO
Definition: avcodec.h:397
uint8_t
uint8_t
Definition: audio_convert.c:194
PAFDemuxContext::preload_count
uint32_t preload_count
Definition: paf.c:34
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
MAGIC
#define MAGIC
Definition: paf.c:27
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:870
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
read_table
static int read_table(AVFormatContext *s, uint32_t *table, uint32_t count)
Definition: paf.c:78
avformat.h
channel_layout.h
PAFDemuxContext::buffer_size
uint32_t buffer_size
Definition: paf.c:30
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:647
AVPacket::stream_index
int stream_index
Definition: avcodec.h:1479
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:331
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
PAFDemuxContext::start_offset
uint32_t start_offset
Definition: paf.c:33
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:48
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3957
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1454
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
AVCodecParameters::channel_layout
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4059
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
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:909
PAFDemuxContext::audio_frame
uint8_t * audio_frame
Definition: paf.c:49
AV_CODEC_ID_PAF_AUDIO
@ AV_CODEC_ID_PAF_AUDIO
Definition: avcodec.h:628
PAFDemuxContext::audio_size
int audio_size
Definition: paf.c:51
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:358
Generated on Wed Aug 24 2022 21:27:23 for FFmpeg by   doxygen 1.8.17