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"
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);
106 vst->codec->width = avio_rl32(pb);
107 vst->codec->height = avio_rl32(pb);
109 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
110 vst->codec->codec_tag = 0;
111 vst->codec->codec_id = AV_CODEC_ID_PAF_VIDEO;
112 avpriv_set_pts_info(vst, 64, 1, 10);
114 ast = avformat_new_stream(s, 0);
116 return AVERROR(ENOMEM);
119 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
120 ast->codec->codec_tag = 0;
121 ast->codec->codec_id = AV_CODEC_ID_PAF_AUDIO;
122 ast->codec->channels = 2;
123 ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
124 ast->codec->sample_rate = 22050;
125 avpriv_set_pts_info(ast, 64, 1, 22050);
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 ||
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;
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));
150 p->video_size = p->max_video_blks * p->buffer_size;
151 p->video_frame = av_mallocz(p->video_size);
153 p->audio_size = p->max_audio_blks * p->buffer_size;
154 p->audio_frame = av_mallocz(p->audio_size);
155 p->temp_audio_frame = av_mallocz(p->audio_size);
157 if (!p->blocks_count_table ||
158 !p->frames_offset_table ||
159 !p->blocks_offset_table ||
162 !p->temp_audio_frame) {
163 ret = AVERROR(ENOMEM);
167 avio_seek(pb, p->buffer_size, SEEK_SET);
169 read_table(s, p->blocks_count_table, p->nb_frames);
170 read_table(s, p->frames_offset_table, p->nb_frames);
171 read_table(s, p->blocks_offset_table, p->frame_blks);
174 p->current_frame = 0;
175 p->current_frame_block = 0;
177 avio_seek(pb, p->start_offset, SEEK_SET);
187 static int read_packet(AVFormatContext *s, AVPacket *pkt)
189 PAFDemuxContext *p = s->priv_data;
190 AVIOContext *pb = s->pb;
191 uint32_t count, offset;
194 if (p->current_frame >= p->nb_frames)
201 if (av_new_packet(pkt, p->audio_size) < 0)
202 return AVERROR(ENOMEM);
204 memcpy(pkt->data, p->temp_audio_frame, p->audio_size);
205 pkt->duration = PAF_SOUND_SAMPLES * (p->audio_size / PAF_SOUND_FRAME_SIZE);
206 pkt->flags |= AV_PKT_FLAG_KEY;
207 pkt->stream_index = 1;
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;
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;
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);
228 if (offset > p->video_size - p->buffer_size)
229 return AVERROR_INVALIDDATA;
231 avio_read(pb, p->video_frame + offset, p->buffer_size);
233 p->current_frame_block++;
236 if (p->frames_offset_table[p->current_frame] >= p->video_size)
237 return AVERROR_INVALIDDATA;
239 size = p->video_size - p->frames_offset_table[p->current_frame];
241 if (av_new_packet(pkt, size) < 0)
242 return AVERROR(ENOMEM);
244 pkt->stream_index = 0;
246 memcpy(pkt->data, p->video_frame + p->frames_offset_table[p->current_frame], size);
247 if (pkt->data[0] & 0x20)
248 pkt->flags |= AV_PKT_FLAG_KEY;
254 AVInputFormat ff_paf_demuxer = {
256 .long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File"),
257 .priv_data_size = sizeof(PAFDemuxContext),
258 .read_probe = read_probe,
259 .read_header = read_header,
260 .read_packet = read_packet,
261 .read_close = read_close,