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 22#include "libavutil/channel_layout.h" 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 29typedef 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; 39 uint32_t current_frame_count; 40 uint32_t current_frame_block; 41 42 uint32_t *blocks_count_table; 43 uint32_t *frames_offset_table; 44 uint32_t *blocks_offset_table; 45 46 uint8_t *video_frame; 47 int video_size; 48 49 uint8_t *audio_frame; 50 uint8_t *temp_audio_frame; 51 int audio_size; 52 53 int got_audio; 54} PAFDemuxContext; 55 56static 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 64static int read_close(AVFormatContext *s) 65{ 66 PAFDemuxContext *p = s->priv_data; 67 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); 74 75 return 0; 76} 77 78static 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 88static int read_header(AVFormatContext *s) 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); 106 107 vst->codec->width = avio_rl32(pb); 108 vst->codec->height = avio_rl32(pb); 109 avio_skip(pb, 4); 110 111 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); 115 116 ast = avformat_new_stream(s, 0); 117 if (!ast) 118 return AVERROR(ENOMEM); 119 120 ast->start_time = 0; 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); 128 129 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 || 138 p->frame_blks < 1 || 139 p->nb_frames < 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; 147 148 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)); 154 155 p->video_size = p->max_video_blks * p->buffer_size; 156 p->video_frame = av_mallocz(p->video_size); 157 158 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); 161 162 if (!p->blocks_count_table || 163 !p->frames_offset_table || 164 !p->blocks_offset_table || 165 !p->video_frame || 166 !p->audio_frame || 167 !p->temp_audio_frame) { 168 ret = AVERROR(ENOMEM); 169 goto fail; 170 } 171 172 avio_seek(pb, p->buffer_size, SEEK_SET); 173 174 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); 177 178 p->got_audio = 0; 179 p->current_frame = 0; 180 p->current_frame_block = 0; 181 182 avio_seek(pb, p->start_offset, SEEK_SET); 183 184 return 0; 185 186fail: 187 read_close(s); 188 189 return ret; 190} 191 192static int read_packet(AVFormatContext *s, AVPacket *pkt) 193{ 194 PAFDemuxContext *p = s->priv_data; 195 AVIOContext *pb = s->pb; 196 uint32_t count, offset; 197 int size, i; 198 199 if (p->current_frame >= p->nb_frames) 200 return AVERROR_EOF; 201 202 if (url_feof(pb)) 203 return AVERROR_EOF; 204 205 if (p->got_audio) { 206 if (av_new_packet(pkt, p->audio_size) < 0) 207 return AVERROR(ENOMEM); 208 209 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; 213 p->got_audio = 0; 214 return pkt->size; 215 } 216 217 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; 222 223 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; 227 228 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); 231 p->got_audio = 1; 232 } 233 } else { 234 if (offset > p->video_size - p->buffer_size) 235 return AVERROR_INVALIDDATA; 236 237 avio_read(pb, p->video_frame + offset, p->buffer_size); 238 } 239 p->current_frame_block++; 240 } 241 242 if (p->frames_offset_table[p->current_frame] >= p->video_size) 243 return AVERROR_INVALIDDATA; 244 245 size = p->video_size - p->frames_offset_table[p->current_frame]; 246 247 if (av_new_packet(pkt, size) < 0) 248 return AVERROR(ENOMEM); 249 250 pkt->stream_index = 0; 251 pkt->duration = 1; 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; 255 p->current_frame++; 256 257 return pkt->size; 258} 259 260AVInputFormat ff_paf_demuxer = { 261 .name = "paf", 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, 268}; 269