2 * Packed Animation File demuxer
3 * Copyright (c) 2012 Paul B Mahol
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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"
27 #define MAGIC "Packed Animation File V1.0\n(c) 1992-96 Amazing Studio\x0a\x1a"
28 #define PAF_SOUND_SAMPLES 2205
29 #define PAF_SOUND_FRAME_SIZE ((256 + PAF_SOUND_SAMPLES) * 2)
31 typedef struct PAFDemuxContext {
35 uint32_t start_offset;
36 uint32_t preload_count;
37 uint32_t max_video_blks;
38 uint32_t max_audio_blks;
40 uint32_t current_frame;
41 uint32_t current_frame_count;
42 uint32_t current_frame_block;
44 uint32_t *blocks_count_table;
45 uint32_t *frames_offset_table;
46 uint32_t *blocks_offset_table;
52 uint8_t *temp_audio_frame;
58 static int read_probe(AVProbeData *p)
60 if ((p->buf_size >= strlen(MAGIC)) &&
61 !memcmp(p->buf, MAGIC, strlen(MAGIC)))
62 return AVPROBE_SCORE_MAX;
66 static int read_close(AVFormatContext *s)
68 PAFDemuxContext *p = s->priv_data;
70 av_freep(&p->blocks_count_table);
71 av_freep(&p->frames_offset_table);
72 av_freep(&p->blocks_offset_table);
73 av_freep(&p->video_frame);
74 av_freep(&p->audio_frame);
75 av_freep(&p->temp_audio_frame);
80 static void read_table(AVFormatContext *s, uint32_t *table, uint32_t count)
84 for (i = 0; i < count; i++)
85 table[i] = avio_rl32(s->pb);
87 avio_skip(s->pb, 4 * (FFALIGN(count, 512) - count));
90 static int read_header(AVFormatContext *s)
92 PAFDemuxContext *p = s->priv_data;
93 AVIOContext *pb = s->pb;
99 vst = avformat_new_stream(s, 0);
101 return AVERROR(ENOMEM);
106 p->nb_frames = avio_rl32(pb);
109 vst->codecpar->width = avio_rl32(pb);
110 vst->codecpar->height = avio_rl32(pb);
113 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
114 vst->codecpar->codec_tag = 0;
115 vst->codecpar->codec_id = AV_CODEC_ID_PAF_VIDEO;
116 avpriv_set_pts_info(vst, 64, 1, 10);
118 ast = avformat_new_stream(s, 0);
120 return AVERROR(ENOMEM);
123 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
124 ast->codecpar->codec_tag = 0;
125 ast->codecpar->codec_id = AV_CODEC_ID_PAF_AUDIO;
126 ast->codecpar->channels = 2;
127 ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
128 ast->codecpar->sample_rate = 22050;
129 avpriv_set_pts_info(ast, 64, 1, 22050);
131 p->buffer_size = avio_rl32(pb);
132 p->preload_count = avio_rl32(pb);
133 p->frame_blks = avio_rl32(pb);
134 p->start_offset = avio_rl32(pb);
135 p->max_video_blks = avio_rl32(pb);
136 p->max_audio_blks = avio_rl32(pb);
137 if (p->buffer_size < 175 ||
138 p->max_audio_blks < 2 ||
139 p->max_video_blks < 1 ||
142 p->preload_count < 1 ||
143 p->buffer_size > 2048 ||
144 p->max_video_blks > 2048 ||
145 p->max_audio_blks > 2048 ||
146 p->nb_frames > INT_MAX / sizeof(uint32_t) ||
147 p->frame_blks > INT_MAX / sizeof(uint32_t))
148 return AVERROR_INVALIDDATA;
150 p->blocks_count_table = av_mallocz(p->nb_frames *
151 sizeof(*p->blocks_count_table));
152 p->frames_offset_table = av_mallocz(p->nb_frames *
153 sizeof(*p->frames_offset_table));
154 p->blocks_offset_table = av_mallocz(p->frame_blks *
155 sizeof(*p->blocks_offset_table));
157 p->video_size = p->max_video_blks * p->buffer_size;
158 p->video_frame = av_mallocz(p->video_size);
160 p->audio_size = p->max_audio_blks * p->buffer_size;
161 p->audio_frame = av_mallocz(p->audio_size);
162 p->temp_audio_frame = av_mallocz(p->audio_size);
164 if (!p->blocks_count_table ||
165 !p->frames_offset_table ||
166 !p->blocks_offset_table ||
169 !p->temp_audio_frame) {
170 ret = AVERROR(ENOMEM);
174 avio_seek(pb, p->buffer_size, SEEK_SET);
176 read_table(s, p->blocks_count_table, p->nb_frames);
177 read_table(s, p->frames_offset_table, p->nb_frames);
178 read_table(s, p->blocks_offset_table, p->frame_blks);
181 p->current_frame = 0;
182 p->current_frame_block = 0;
184 avio_seek(pb, p->start_offset, SEEK_SET);
194 static int read_packet(AVFormatContext *s, AVPacket *pkt)
196 PAFDemuxContext *p = s->priv_data;
197 AVIOContext *pb = s->pb;
198 uint32_t count, offset;
201 if (p->current_frame >= p->nb_frames || pb->eof_reached)
205 if (av_new_packet(pkt, p->audio_size) < 0)
206 return AVERROR(ENOMEM);
208 memcpy(pkt->data, p->temp_audio_frame, p->audio_size);
209 pkt->duration = PAF_SOUND_SAMPLES * (p->audio_size / PAF_SOUND_FRAME_SIZE);
210 pkt->flags |= AV_PKT_FLAG_KEY;
211 pkt->stream_index = 1;
216 count = (p->current_frame == 0) ? p->preload_count
217 : p->blocks_count_table[p->current_frame - 1];
218 for (i = 0; i < count; i++) {
219 if (p->current_frame_block >= p->frame_blks)
220 return AVERROR_INVALIDDATA;
222 offset = p->blocks_offset_table[p->current_frame_block] & ~(1U << 31);
223 if (p->blocks_offset_table[p->current_frame_block] & (1U << 31)) {
224 if (offset > p->audio_size - p->buffer_size)
225 return AVERROR_INVALIDDATA;
227 avio_read(pb, p->audio_frame + offset, p->buffer_size);
228 if (offset == (p->max_audio_blks - 2) * p->buffer_size) {
229 memcpy(p->temp_audio_frame, p->audio_frame, p->audio_size);
233 if (offset > p->video_size - p->buffer_size)
234 return AVERROR_INVALIDDATA;
236 avio_read(pb, p->video_frame + offset, p->buffer_size);
238 p->current_frame_block++;
241 if (p->frames_offset_table[p->current_frame] >= p->video_size)
242 return AVERROR_INVALIDDATA;
244 size = p->video_size - p->frames_offset_table[p->current_frame];
246 if (av_new_packet(pkt, size) < 0)
247 return AVERROR(ENOMEM);
249 pkt->stream_index = 0;
251 memcpy(pkt->data, p->video_frame + p->frames_offset_table[p->current_frame], size);
252 if (pkt->data[0] & 0x20)
253 pkt->flags |= AV_PKT_FLAG_KEY;
259 AVInputFormat ff_paf_demuxer = {
261 .long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File"),
262 .priv_data_size = sizeof(PAFDemuxContext),
263 .read_probe = read_probe,
264 .read_header = read_header,
265 .read_packet = read_packet,
266 .read_close = read_close,