blob: fa30cdd72a0c0e83516bb5404c834e5e0815317b
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 PAFDemuxContext { |
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->codecpar->width = avio_rl32(pb); |
108 | vst->codecpar->height = avio_rl32(pb); |
109 | avio_skip(pb, 4); |
110 | |
111 | vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
112 | vst->codecpar->codec_tag = 0; |
113 | vst->codecpar->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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
122 | ast->codecpar->codec_tag = 0; |
123 | ast->codecpar->codec_id = AV_CODEC_ID_PAF_AUDIO; |
124 | ast->codecpar->channels = 2; |
125 | ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO; |
126 | ast->codecpar->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 | }; |
269 |