| 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 | |
| 29 | typedef 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 | |
| 56 | static 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 | |
| 64 | static 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 | |
| 78 | static 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 | |
| 88 | static 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 | |
| 186 | fail: |
| 187 | read_close(s); |
| 188 | |
| 189 | return ret; |
| 190 | } |
| 191 | |
| 192 | static 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 (avio_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 | |
| 260 | AVInputFormat 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 | }; |