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2ba45a60 DM |
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 | }; |