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 
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;
41 
42  uint32_t *blocks_count_table;
45 
48 
52 
53  int got_audio;
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 
65 {
66  PAFDemuxContext *p = s->priv_data;
67 
71  av_freep(&p->video_frame);
72  av_freep(&p->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 
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 
116  vst->codecpar->codec_tag = 0;
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;
126  ast->codecpar->codec_tag = 0;
128  ast->codecpar->channels = 2;
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  if (p->buffer_size < 175 ||
140  p->max_audio_blks < 2 ||
141  p->max_video_blks < 1 ||
142  p->frame_blks < 1 ||
143  p->nb_frames < 1 ||
144  p->preload_count < 1 ||
145  p->buffer_size > 2048 ||
146  p->max_video_blks > 2048 ||
147  p->max_audio_blks > 2048 ||
148  p->nb_frames > INT_MAX / sizeof(uint32_t) ||
149  p->frame_blks > INT_MAX / sizeof(uint32_t))
150  return AVERROR_INVALIDDATA;
151 
153  sizeof(*p->blocks_count_table));
155  sizeof(*p->frames_offset_table));
157  sizeof(*p->blocks_offset_table));
158 
161 
165 
166  if (!p->blocks_count_table ||
167  !p->frames_offset_table ||
168  !p->blocks_offset_table ||
169  !p->video_frame ||
170  !p->audio_frame ||
171  !p->temp_audio_frame) {
172  ret = AVERROR(ENOMEM);
173  goto fail;
174  }
175 
176  avio_seek(pb, p->buffer_size, SEEK_SET);
177 
178  ret = read_table(s, p->blocks_count_table, p->nb_frames);
179  if (ret < 0)
180  goto fail;
181  ret = read_table(s, p->frames_offset_table, p->nb_frames);
182  if (ret < 0)
183  goto fail;
184  ret = read_table(s, p->blocks_offset_table, p->frame_blks);
185  if (ret < 0)
186  goto fail;
187 
188  p->got_audio = 0;
189  p->current_frame = 0;
190  p->current_frame_block = 0;
191 
192  avio_seek(pb, p->start_offset, SEEK_SET);
193 
194  return 0;
195 
196 fail:
197  read_close(s);
198 
199  return ret;
200 }
201 
203 {
204  PAFDemuxContext *p = s->priv_data;
205  AVIOContext *pb = s->pb;
206  uint32_t count, offset;
207  int size, i, ret;
208 
209  if (p->current_frame >= p->nb_frames)
210  return AVERROR_EOF;
211 
212  if (avio_feof(pb))
213  return AVERROR_EOF;
214 
215  if (p->got_audio) {
216  if ((ret = av_new_packet(pkt, p->audio_size)) < 0)
217  return ret;
218 
219  memcpy(pkt->data, p->temp_audio_frame, p->audio_size);
221  pkt->flags |= AV_PKT_FLAG_KEY;
222  pkt->stream_index = 1;
223  p->got_audio = 0;
224  return pkt->size;
225  }
226 
227  count = (p->current_frame == 0) ? p->preload_count
228  : p->blocks_count_table[p->current_frame - 1];
229  for (i = 0; i < count; i++) {
230  if (p->current_frame_block >= p->frame_blks)
231  return AVERROR_INVALIDDATA;
232 
233  offset = p->blocks_offset_table[p->current_frame_block] & ~(1U << 31);
234  if (p->blocks_offset_table[p->current_frame_block] & (1U << 31)) {
235  if (offset > p->audio_size - p->buffer_size)
236  return AVERROR_INVALIDDATA;
237 
238  avio_read(pb, p->audio_frame + offset, p->buffer_size);
239  if (offset == (p->max_audio_blks - 2) * p->buffer_size) {
240  memcpy(p->temp_audio_frame, p->audio_frame, p->audio_size);
241  p->got_audio = 1;
242  }
243  } else {
244  if (offset > p->video_size - p->buffer_size)
245  return AVERROR_INVALIDDATA;
246 
247  avio_read(pb, p->video_frame + offset, p->buffer_size);
248  }
249  p->current_frame_block++;
250  }
251 
253  return AVERROR_INVALIDDATA;
254 
255  size = p->video_size - p->frames_offset_table[p->current_frame];
256 
257  if ((ret = av_new_packet(pkt, size)) < 0)
258  return ret;
259 
260  pkt->stream_index = 0;
261  pkt->duration = 1;
262  memcpy(pkt->data, p->video_frame + p->frames_offset_table[p->current_frame], size);
263  if (pkt->data[0] & 0x20)
264  pkt->flags |= AV_PKT_FLAG_KEY;
265  p->current_frame++;
266 
267  return pkt->size;
268 }
269 
271  .name = "paf",
272  .long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File"),
273  .priv_data_size = sizeof(PAFDemuxContext),
278 };
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define PAF_SOUND_FRAME_SIZE
Definition: paf.h:26
uint32_t * blocks_offset_table
Definition: paf.c:44
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:4899
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int size
Definition: packet.h:364
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
int got_audio
Definition: paf.c:53
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:341
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:237
static AVPacket pkt
#define AV_CH_LAYOUT_STEREO
static int read_header(AVFormatContext *s)
Definition: paf.c:92
uint32_t current_frame_block
Definition: paf.c:40
uint32_t nb_frames
Definition: paf.c:32
Format I/O context.
Definition: avformat.h:1239
uint32_t current_frame_count
Definition: paf.c:39
static int read_close(AVFormatContext *s)
Definition: paf.c:64
uint32_t * frames_offset_table
Definition: paf.c:43
uint8_t
int width
Video only.
Definition: codec_par.h:126
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
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:381
AVInputFormat ff_paf_demuxer
Definition: paf.c:270
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4480
uint8_t * audio_frame
Definition: paf.c:49
uint8_t * data
Definition: packet.h:363
#define AVERROR_EOF
End of file.
Definition: error.h:55
ptrdiff_t size
Definition: opengl_enc.c:100
uint32_t current_frame
Definition: paf.c:38
#define FFALIGN(x, a)
Definition: macros.h:48
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:637
static const uint16_t table[]
Definition: prosumer.c:206
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:401
#define U(x)
Definition: vp56_arith.h:37
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:88
static int read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: paf.c:202
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:754
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:115
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
GLsizei count
Definition: opengl_enc.c:108
#define fail()
Definition: checkasm.h:133
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:369
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:444
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
uint32_t max_video_blks
Definition: paf.c:35
uint8_t * video_frame
Definition: paf.c:46
audio channel layout utility functions
#define s(width, name)
Definition: cbs_vp9.c:257
uint8_t * temp_audio_frame
Definition: paf.c:50
Stream structure.
Definition: avformat.h:880
uint32_t start_offset
Definition: paf.c:33
AVIOContext * pb
I/O context.
Definition: avformat.h:1281
uint32_t buffer_size
Definition: paf.c:30
int video_size
Definition: paf.c:47
#define PAF_SOUND_SAMPLES
Definition: paf.h:25
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:929
int sample_rate
Audio only.
Definition: codec_par.h:170
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
Main libavformat public API header.
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:919
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:931
uint32_t preload_count
Definition: paf.c:34
uint32_t max_audio_blks
Definition: paf.c:36
void * priv_data
Format private data.
Definition: avformat.h:1267
static int read_probe(const AVProbeData *p)
Definition: paf.c:56
int channels
Audio only.
Definition: codec_par.h:166
#define MAGIC
Definition: paf.c:27
uint32_t * blocks_count_table
Definition: paf.c:42
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:652
static int read_table(AVFormatContext *s, uint32_t *table, uint32_t count)
Definition: paf.c:78
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1045
#define av_malloc_array(a, b)
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:368
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
int stream_index
Definition: packet.h:365
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
This structure stores compressed data.
Definition: packet.h:340
int audio_size
Definition: paf.c:51
uint32_t frame_blks
Definition: paf.c:31
for(j=16;j >0;--j)
int i
Definition: input.c:407