2 * Packed Animation File demuxer
3 * Copyright (c) 2012 Paul B Mahol
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/channel_layout.h"
23 #include "libavcodec/paf.h"
27 #define MAGIC "Packed Animation File V1.0\n(c) 1992-96 Amazing Studio\x0a\x1a"
29 typedef struct PAFDemuxContext {
33 uint32_t start_offset;
34 uint32_t preload_count;
35 uint32_t max_video_blks;
36 uint32_t max_audio_blks;
38 uint32_t current_frame;
39 uint32_t current_frame_count;
40 uint32_t current_frame_block;
42 uint32_t *blocks_count_table;
43 uint32_t *frames_offset_table;
44 uint32_t *blocks_offset_table;
50 uint8_t *temp_audio_frame;
56 static int read_probe(AVProbeData *p)
58 if ((p->buf_size >= strlen(MAGIC)) &&
59 !memcmp(p->buf, MAGIC, strlen(MAGIC)))
60 return AVPROBE_SCORE_MAX;
64 static int read_close(AVFormatContext *s)
66 PAFDemuxContext *p = s->priv_data;
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);
78 static void read_table(AVFormatContext *s, uint32_t *table, uint32_t count)
82 for (i = 0; i < count; i++)
83 table[i] = avio_rl32(s->pb);
85 avio_skip(s->pb, 4 * (FFALIGN(count, 512) - count));
88 static int read_header(AVFormatContext *s)
90 PAFDemuxContext *p = s->priv_data;
91 AVIOContext *pb = s->pb;
97 vst = avformat_new_stream(s, 0);
99 return AVERROR(ENOMEM);
104 p->nb_frames = avio_rl32(pb);
107 vst->codec->width = avio_rl32(pb);
108 vst->codec->height = avio_rl32(pb);
111 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
112 vst->codec->codec_tag = 0;
113 vst->codec->codec_id = AV_CODEC_ID_PAF_VIDEO;
114 avpriv_set_pts_info(vst, 64, 1, 10);
116 ast = avformat_new_stream(s, 0);
118 return AVERROR(ENOMEM);
121 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
122 ast->codec->codec_tag = 0;
123 ast->codec->codec_id = AV_CODEC_ID_PAF_AUDIO;
124 ast->codec->channels = 2;
125 ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
126 ast->codec->sample_rate = 22050;
127 avpriv_set_pts_info(ast, 64, 1, 22050);
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 ||
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;
148 p->blocks_count_table = av_mallocz(p->nb_frames *
149 sizeof(*p->blocks_count_table));
150 p->frames_offset_table = av_mallocz(p->nb_frames *
151 sizeof(*p->frames_offset_table));
152 p->blocks_offset_table = av_mallocz(p->frame_blks *
153 sizeof(*p->blocks_offset_table));
155 p->video_size = p->max_video_blks * p->buffer_size;
156 p->video_frame = av_mallocz(p->video_size);
158 p->audio_size = p->max_audio_blks * p->buffer_size;
159 p->audio_frame = av_mallocz(p->audio_size);
160 p->temp_audio_frame = av_mallocz(p->audio_size);
162 if (!p->blocks_count_table ||
163 !p->frames_offset_table ||
164 !p->blocks_offset_table ||
167 !p->temp_audio_frame) {
168 ret = AVERROR(ENOMEM);
172 avio_seek(pb, p->buffer_size, SEEK_SET);
174 read_table(s, p->blocks_count_table, p->nb_frames);
175 read_table(s, p->frames_offset_table, p->nb_frames);
176 read_table(s, p->blocks_offset_table, p->frame_blks);
179 p->current_frame = 0;
180 p->current_frame_block = 0;
182 avio_seek(pb, p->start_offset, SEEK_SET);
192 static int read_packet(AVFormatContext *s, AVPacket *pkt)
194 PAFDemuxContext *p = s->priv_data;
195 AVIOContext *pb = s->pb;
196 uint32_t count, offset;
199 if (p->current_frame >= p->nb_frames)
206 if (av_new_packet(pkt, p->audio_size) < 0)
207 return AVERROR(ENOMEM);
209 memcpy(pkt->data, p->temp_audio_frame, p->audio_size);
210 pkt->duration = PAF_SOUND_SAMPLES * (p->audio_size / PAF_SOUND_FRAME_SIZE);
211 pkt->flags |= AV_PKT_FLAG_KEY;
212 pkt->stream_index = 1;
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;
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;
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);
234 if (offset > p->video_size - p->buffer_size)
235 return AVERROR_INVALIDDATA;
237 avio_read(pb, p->video_frame + offset, p->buffer_size);
239 p->current_frame_block++;
242 if (p->frames_offset_table[p->current_frame] >= p->video_size)
243 return AVERROR_INVALIDDATA;
245 size = p->video_size - p->frames_offset_table[p->current_frame];
247 if (av_new_packet(pkt, size) < 0)
248 return AVERROR(ENOMEM);
250 pkt->stream_index = 0;
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;
260 AVInputFormat ff_paf_demuxer = {
262 .long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File"),
263 .priv_data_size = sizeof(PAFDemuxContext),
264 .read_probe = read_probe,
265 .read_header = read_header,
266 .read_packet = read_packet,
267 .read_close = read_close,