FFmpeg  4.3.7
paf.c
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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 
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 
157  sizeof(*p->blocks_count_table));
159  sizeof(*p->frames_offset_table));
161  sizeof(*p->blocks_offset_table));
162 
165 
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 
207 {
208  PAFDemuxContext *p = s->priv_data;
209  AVIOContext *pb = s->pb;
210  uint32_t count, offset;
211  int size, i, ret;
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 ((ret = av_new_packet(pkt, p->audio_size)) < 0)
221  return ret;
222 
223  memcpy(pkt->data, p->temp_audio_frame, p->audio_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 
257  return AVERROR_INVALIDDATA;
258 
259  size = p->video_size - p->frames_offset_table[p->current_frame];
260 
261  if ((ret = av_new_packet(pkt, size)) < 0)
262  return ret;
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 
275  .name = "paf",
276  .long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File"),
277  .priv_data_size = sizeof(PAFDemuxContext),
282 };
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int size
#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:4948
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int size
Definition: packet.h:356
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:241
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:329
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:1351
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
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:373
AVInputFormat ff_paf_demuxer
Definition: paf.c:274
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4526
uint8_t * audio_frame
Definition: paf.c:49
uint8_t * data
Definition: packet.h:355
#define AVERROR_EOF
End of file.
Definition: error.h:55
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:625
static const uint16_t table[]
Definition: prosumer.c:206
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:388
#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
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
static int read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: paf.c:206
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:747
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
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 const uint8_t offset[127][2]
Definition: vf_spp.c:93
#define fail()
Definition: checkasm.h:123
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:361
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:876
uint32_t start_offset
Definition: paf.c:33
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
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:925
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:915
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:927
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:1379
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:650
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:1023
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:356
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:357
This structure stores compressed data.
Definition: packet.h:332
int audio_size
Definition: paf.c:51
uint32_t frame_blks
Definition: paf.c:31
for(j=16;j >0;--j)