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(const 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 int read_table(AVFormatContext *s, uint32_t *table, uint32_t count)
82 for (i = 0; i < count; i++) {
84 return AVERROR_INVALIDDATA;
85 table[i] = avio_rl32(s->pb);
88 avio_skip(s->pb, 4 * (FFALIGN(count, 512) - count));
92 static int read_header(AVFormatContext *s)
94 PAFDemuxContext *p = s->priv_data;
95 AVIOContext *pb = s->pb;
101 vst = avformat_new_stream(s, 0);
103 return AVERROR(ENOMEM);
108 p->nb_frames = avio_rl32(pb);
111 vst->codecpar->width = avio_rl32(pb);
112 vst->codecpar->height = avio_rl32(pb);
115 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
116 vst->codecpar->codec_tag = 0;
117 vst->codecpar->codec_id = AV_CODEC_ID_PAF_VIDEO;
118 avpriv_set_pts_info(vst, 64, 1, 10);
120 ast = avformat_new_stream(s, 0);
122 return AVERROR(ENOMEM);
125 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
126 ast->codecpar->codec_tag = 0;
127 ast->codecpar->codec_id = AV_CODEC_ID_PAF_AUDIO;
128 ast->codecpar->channels = 2;
129 ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
130 ast->codecpar->sample_rate = 22050;
131 avpriv_set_pts_info(ast, 64, 1, 22050);
133 p->buffer_size = avio_rl32(pb);
134 p->preload_count = avio_rl32(pb);
135 p->frame_blks = avio_rl32(pb);
136 p->start_offset = avio_rl32(pb);
137 p->max_video_blks = avio_rl32(pb);
138 p->max_audio_blks = avio_rl32(pb);
141 return AVERROR_INVALIDDATA;
143 if (p->buffer_size < 175 ||
144 p->max_audio_blks < 2 ||
145 p->max_video_blks < 1 ||
148 p->preload_count < 1 ||
149 p->buffer_size > 2048 ||
150 p->max_video_blks > 2048 ||
151 p->max_audio_blks > 2048 ||
152 p->nb_frames > INT_MAX / sizeof(uint32_t) ||
153 p->frame_blks > INT_MAX / sizeof(uint32_t))
154 return AVERROR_INVALIDDATA;
156 p->blocks_count_table = av_malloc_array(p->nb_frames,
157 sizeof(*p->blocks_count_table));
158 p->frames_offset_table = av_malloc_array(p->nb_frames,
159 sizeof(*p->frames_offset_table));
160 p->blocks_offset_table = av_malloc_array(p->frame_blks,
161 sizeof(*p->blocks_offset_table));
163 p->video_size = p->max_video_blks * p->buffer_size;
164 p->video_frame = av_mallocz(p->video_size);
166 p->audio_size = p->max_audio_blks * p->buffer_size;
167 p->audio_frame = av_mallocz(p->audio_size);
168 p->temp_audio_frame = av_mallocz(p->audio_size);
170 if (!p->blocks_count_table ||
171 !p->frames_offset_table ||
172 !p->blocks_offset_table ||
175 !p->temp_audio_frame) {
176 ret = AVERROR(ENOMEM);
180 avio_seek(pb, p->buffer_size, SEEK_SET);
182 ret = read_table(s, p->blocks_count_table, p->nb_frames);
185 ret = read_table(s, p->frames_offset_table, p->nb_frames);
188 ret = read_table(s, p->blocks_offset_table, p->frame_blks);
193 p->current_frame = 0;
194 p->current_frame_block = 0;
196 avio_seek(pb, p->start_offset, SEEK_SET);
206 static int read_packet(AVFormatContext *s, AVPacket *pkt)
208 PAFDemuxContext *p = s->priv_data;
209 AVIOContext *pb = s->pb;
210 uint32_t count, offset;
213 if (p->current_frame >= p->nb_frames)
220 if ((ret = av_new_packet(pkt, p->audio_size)) < 0)
223 memcpy(pkt->data, p->temp_audio_frame, p->audio_size);
224 pkt->duration = PAF_SOUND_SAMPLES * (p->audio_size / PAF_SOUND_FRAME_SIZE);
225 pkt->flags |= AV_PKT_FLAG_KEY;
226 pkt->stream_index = 1;
231 count = (p->current_frame == 0) ? p->preload_count
232 : p->blocks_count_table[p->current_frame - 1];
233 for (i = 0; i < count; i++) {
234 if (p->current_frame_block >= p->frame_blks)
235 return AVERROR_INVALIDDATA;
237 offset = p->blocks_offset_table[p->current_frame_block] & ~(1U << 31);
238 if (p->blocks_offset_table[p->current_frame_block] & (1U << 31)) {
239 if (offset > p->audio_size - p->buffer_size)
240 return AVERROR_INVALIDDATA;
242 avio_read(pb, p->audio_frame + offset, p->buffer_size);
243 if (offset == (p->max_audio_blks - 2) * p->buffer_size) {
244 memcpy(p->temp_audio_frame, p->audio_frame, p->audio_size);
248 if (offset > p->video_size - p->buffer_size)
249 return AVERROR_INVALIDDATA;
251 avio_read(pb, p->video_frame + offset, p->buffer_size);
253 p->current_frame_block++;
256 if (p->frames_offset_table[p->current_frame] >= p->video_size)
257 return AVERROR_INVALIDDATA;
259 size = p->video_size - p->frames_offset_table[p->current_frame];
261 if ((ret = av_new_packet(pkt, size)) < 0)
264 pkt->stream_index = 0;
266 memcpy(pkt->data, p->video_frame + p->frames_offset_table[p->current_frame], size);
267 if (pkt->data[0] & 0x20)
268 pkt->flags |= AV_PKT_FLAG_KEY;
274 AVInputFormat ff_paf_demuxer = {
276 .long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File"),
277 .priv_data_size = sizeof(PAFDemuxContext),
278 .read_probe = read_probe,
279 .read_header = read_header,
280 .read_packet = read_packet,
281 .read_close = read_close,