FFmpeg
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 void read_table(AVFormatContext *s, uint32_t *table, uint32_t count)
79 {
80  int i;
81 
82  for (i = 0; i < count; i++)
83  table[i] = avio_rl32(s->pb);
84 
85  avio_skip(s->pb, 4 * (FFALIGN(count, 512) - count));
86 }
87 
89 {
90  PAFDemuxContext *p = s->priv_data;
91  AVIOContext *pb = s->pb;
92  AVStream *ast, *vst;
93  int ret = 0;
94 
95  avio_skip(pb, 132);
96 
97  vst = avformat_new_stream(s, 0);
98  if (!vst)
99  return AVERROR(ENOMEM);
100 
101  vst->start_time = 0;
102  vst->nb_frames =
103  vst->duration =
104  p->nb_frames = avio_rl32(pb);
105  avio_skip(pb, 4);
106 
107  vst->codecpar->width = avio_rl32(pb);
108  vst->codecpar->height = avio_rl32(pb);
109  avio_skip(pb, 4);
110 
112  vst->codecpar->codec_tag = 0;
114  avpriv_set_pts_info(vst, 64, 1, 10);
115 
116  ast = avformat_new_stream(s, 0);
117  if (!ast)
118  return AVERROR(ENOMEM);
119 
120  ast->start_time = 0;
122  ast->codecpar->codec_tag = 0;
124  ast->codecpar->channels = 2;
126  ast->codecpar->sample_rate = 22050;
127  avpriv_set_pts_info(ast, 64, 1, 22050);
128 
129  p->buffer_size = avio_rl32(pb);
130  p->preload_count = avio_rl32(pb);
131  p->frame_blks = avio_rl32(pb);
132  p->start_offset = avio_rl32(pb);
133  p->max_video_blks = avio_rl32(pb);
134  p->max_audio_blks = avio_rl32(pb);
135  if (p->buffer_size < 175 ||
136  p->max_audio_blks < 2 ||
137  p->max_video_blks < 1 ||
138  p->frame_blks < 1 ||
139  p->nb_frames < 1 ||
140  p->preload_count < 1 ||
141  p->buffer_size > 2048 ||
142  p->max_video_blks > 2048 ||
143  p->max_audio_blks > 2048 ||
144  p->nb_frames > INT_MAX / sizeof(uint32_t) ||
145  p->frame_blks > INT_MAX / sizeof(uint32_t))
146  return AVERROR_INVALIDDATA;
147 
149  sizeof(*p->blocks_count_table));
151  sizeof(*p->frames_offset_table));
153  sizeof(*p->blocks_offset_table));
154 
157 
161 
162  if (!p->blocks_count_table ||
163  !p->frames_offset_table ||
164  !p->blocks_offset_table ||
165  !p->video_frame ||
166  !p->audio_frame ||
167  !p->temp_audio_frame) {
168  ret = AVERROR(ENOMEM);
169  goto fail;
170  }
171 
172  avio_seek(pb, p->buffer_size, SEEK_SET);
173 
177 
178  p->got_audio = 0;
179  p->current_frame = 0;
180  p->current_frame_block = 0;
181 
182  avio_seek(pb, p->start_offset, SEEK_SET);
183 
184  return 0;
185 
186 fail:
187  read_close(s);
188 
189  return ret;
190 }
191 
193 {
194  PAFDemuxContext *p = s->priv_data;
195  AVIOContext *pb = s->pb;
196  uint32_t count, offset;
197  int size, i;
198 
199  if (p->current_frame >= p->nb_frames)
200  return AVERROR_EOF;
201 
202  if (avio_feof(pb))
203  return AVERROR_EOF;
204 
205  if (p->got_audio) {
206  if (av_new_packet(pkt, p->audio_size) < 0)
207  return AVERROR(ENOMEM);
208 
209  memcpy(pkt->data, p->temp_audio_frame, p->audio_size);
211  pkt->flags |= AV_PKT_FLAG_KEY;
212  pkt->stream_index = 1;
213  p->got_audio = 0;
214  return pkt->size;
215  }
216 
217  count = (p->current_frame == 0) ? p->preload_count
218  : p->blocks_count_table[p->current_frame - 1];
219  for (i = 0; i < count; i++) {
220  if (p->current_frame_block >= p->frame_blks)
221  return AVERROR_INVALIDDATA;
222 
223  offset = p->blocks_offset_table[p->current_frame_block] & ~(1U << 31);
224  if (p->blocks_offset_table[p->current_frame_block] & (1U << 31)) {
225  if (offset > p->audio_size - p->buffer_size)
226  return AVERROR_INVALIDDATA;
227 
228  avio_read(pb, p->audio_frame + offset, p->buffer_size);
229  if (offset == (p->max_audio_blks - 2) * p->buffer_size) {
230  memcpy(p->temp_audio_frame, p->audio_frame, p->audio_size);
231  p->got_audio = 1;
232  }
233  } else {
234  if (offset > p->video_size - p->buffer_size)
235  return AVERROR_INVALIDDATA;
236 
237  avio_read(pb, p->video_frame + offset, p->buffer_size);
238  }
239  p->current_frame_block++;
240  }
241 
243  return AVERROR_INVALIDDATA;
244 
245  size = p->video_size - p->frames_offset_table[p->current_frame];
246 
247  if (av_new_packet(pkt, size) < 0)
248  return AVERROR(ENOMEM);
249 
250  pkt->stream_index = 0;
251  pkt->duration = 1;
252  memcpy(pkt->data, p->video_frame + p->frames_offset_table[p->current_frame], size);
253  if (pkt->data[0] & 0x20)
254  pkt->flags |= AV_PKT_FLAG_KEY;
255  p->current_frame++;
256 
257  return pkt->size;
258 }
259 
261  .name = "paf",
262  .long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File"),
263  .priv_data_size = sizeof(PAFDemuxContext),
268 };
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:4926
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3968
int size
Definition: avcodec.h:1481
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
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:334
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
static AVPacket pkt
#define AV_CH_LAYOUT_STEREO
static int read_header(AVFormatContext *s)
Definition: paf.c:88
uint32_t current_frame_block
Definition: paf.c:40
uint32_t nb_frames
Definition: paf.c:32
Format I/O context.
Definition: avformat.h:1358
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: avcodec.h:4034
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: avcodec.h:1498
AVInputFormat ff_paf_demuxer
Definition: paf.c:260
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4499
uint8_t * audio_frame
Definition: paf.c:49
uint8_t * data
Definition: avcodec.h:1480
#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: avcodec.h:4070
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:650
static const uint16_t table[]
Definition: prosumer.c:206
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1512
#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:86
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
static int read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: paf.c:192
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:772
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3964
GLsizei count
Definition: opengl_enc.c:108
#define fail()
Definition: checkasm.h:122
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1486
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:449
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
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:881
uint32_t start_offset
Definition: paf.c:33
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
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:446
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:930
int sample_rate
Audio only.
Definition: avcodec.h:4078
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
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:920
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:932
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:1386
static int read_probe(const AVProbeData *p)
Definition: paf.c:56
int channels
Audio only.
Definition: avcodec.h:4074
#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:654
static void 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:1028
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:361
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3972
int stream_index
Definition: avcodec.h:1482
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: avcodec.h:1457
int audio_size
Definition: paf.c:51
uint32_t frame_blks
Definition: paf.c:31
for(j=16;j >0;--j)