FFmpeg
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
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 {
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(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  vst->codec->width = avio_rl32(pb);
107  vst->codec->height = avio_rl32(pb);
108  avio_skip(pb, 4);
110  vst->codec->codec_tag = 0;
112  avpriv_set_pts_info(vst, 64, 1, 10);
113 
114  ast = avformat_new_stream(s, 0);
115  if (!ast)
116  return AVERROR(ENOMEM);
117 
118  ast->start_time = 0;
120  ast->codec->codec_tag = 0;
122  ast->codec->channels = 2;
124  ast->codec->sample_rate = 22050;
125  avpriv_set_pts_info(ast, 64, 1, 22050);
126 
127  p->buffer_size = avio_rl32(pb);
128  p->preload_count = avio_rl32(pb);
129  p->frame_blks = avio_rl32(pb);
130  p->start_offset = avio_rl32(pb);
131  p->max_video_blks = avio_rl32(pb);
132  p->max_audio_blks = avio_rl32(pb);
133  if (p->buffer_size < 175 ||
134  p->max_audio_blks < 2 ||
135  p->max_video_blks < 1 ||
136  p->frame_blks < 1 ||
137  p->nb_frames < 1 ||
138  p->preload_count < 1 ||
139  p->buffer_size > 2048 ||
140  p->max_video_blks > 2048 ||
141  p->max_audio_blks > 2048 ||
142  p->nb_frames > INT_MAX / sizeof(uint32_t) ||
143  p->frame_blks > INT_MAX / sizeof(uint32_t))
144  return AVERROR_INVALIDDATA;
145 
146  p->blocks_count_table = av_mallocz(p->nb_frames * sizeof(uint32_t));
147  p->frames_offset_table = av_mallocz(p->nb_frames * sizeof(uint32_t));
148  p->blocks_offset_table = av_mallocz(p->frame_blks * sizeof(uint32_t));
149 
152 
156 
157  if (!p->blocks_count_table ||
158  !p->frames_offset_table ||
159  !p->blocks_offset_table ||
160  !p->video_frame ||
161  !p->audio_frame ||
162  !p->temp_audio_frame) {
163  ret = AVERROR(ENOMEM);
164  goto fail;
165  }
166 
167  avio_seek(pb, p->buffer_size, SEEK_SET);
168 
172 
173  p->got_audio = 0;
174  p->current_frame = 0;
175  p->current_frame_block = 0;
176 
177  avio_seek(pb, p->start_offset, SEEK_SET);
178 
179  return 0;
180 
181 fail:
182  read_close(s);
183 
184  return ret;
185 }
186 
188 {
189  PAFDemuxContext *p = s->priv_data;
190  AVIOContext *pb = s->pb;
191  uint32_t count, offset;
192  int size, i;
193 
194  if (p->current_frame >= p->nb_frames)
195  return AVERROR_EOF;
196 
197  if (url_feof(pb))
198  return AVERROR_EOF;
199 
200  if (p->got_audio) {
201  if (av_new_packet(pkt, p->audio_size) < 0)
202  return AVERROR(ENOMEM);
203 
204  memcpy(pkt->data, p->temp_audio_frame, p->audio_size);
206  pkt->flags |= AV_PKT_FLAG_KEY;
207  pkt->stream_index = 1;
208  p->got_audio = 0;
209  return pkt->size;
210  }
211 
212  count = (p->current_frame == 0) ? p->preload_count : p->blocks_count_table[p->current_frame - 1];
213  for (i = 0; i < count; i++) {
214  if (p->current_frame_block >= p->frame_blks)
215  return AVERROR_INVALIDDATA;
216 
217  offset = p->blocks_offset_table[p->current_frame_block] & ~(1U << 31);
218  if (p->blocks_offset_table[p->current_frame_block] & (1U << 31)) {
219  if (offset > p->audio_size - p->buffer_size)
220  return AVERROR_INVALIDDATA;
221 
222  avio_read(pb, p->audio_frame + offset, p->buffer_size);
223  if (offset == (p->max_audio_blks - 2) * p->buffer_size) {
224  memcpy(p->temp_audio_frame, p->audio_frame, p->audio_size);
225  p->got_audio = 1;
226  }
227  } else {
228  if (offset > p->video_size - p->buffer_size)
229  return AVERROR_INVALIDDATA;
230 
231  avio_read(pb, p->video_frame + offset, p->buffer_size);
232  }
233  p->current_frame_block++;
234  }
235 
236  size = p->video_size - p->frames_offset_table[p->current_frame];
237  if (size < 1)
238  return AVERROR_INVALIDDATA;
239 
240  if (av_new_packet(pkt, size) < 0)
241  return AVERROR(ENOMEM);
242 
243  pkt->stream_index = 0;
244  pkt->duration = 1;
245  memcpy(pkt->data, p->video_frame + p->frames_offset_table[p->current_frame], size);
246  if (pkt->data[0] & 0x20)
247  pkt->flags |= AV_PKT_FLAG_KEY;
248  p->current_frame++;
249 
250  return pkt->size;
251 }
252 
254  .name = "paf",
255  .long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File"),
256  .priv_data_size = sizeof(PAFDemuxContext),
261 };