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path: root/libavformat/smush.c (plain)
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1/*
2 * LucasArts Smush demuxer
3 * Copyright (c) 2006 Cyril Zorin
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/intreadwrite.h"
23
24#include "avformat.h"
25#include "avio.h"
26#include "internal.h"
27
28typedef struct SMUSHContext {
29 int version;
30 int audio_stream_index;
31 int video_stream_index;
32} SMUSHContext;
33
34static int smush_read_probe(AVProbeData *p)
35{
36 if (((AV_RL32(p->buf) == MKTAG('S', 'A', 'N', 'M') &&
37 AV_RL32(p->buf + 8) == MKTAG('S', 'H', 'D', 'R')) ||
38 (AV_RL32(p->buf) == MKTAG('A', 'N', 'I', 'M') &&
39 AV_RL32(p->buf + 8) == MKTAG('A', 'H', 'D', 'R')))) {
40 return AVPROBE_SCORE_MAX;
41 }
42
43 return 0;
44}
45
46static int smush_read_header(AVFormatContext *ctx)
47{
48 SMUSHContext *smush = ctx->priv_data;
49 AVIOContext *pb = ctx->pb;
50 AVStream *vst, *ast;
51 uint32_t magic, nframes, size, subversion, i;
52 uint32_t width = 0, height = 0, got_audio = 0, read = 0;
53 uint32_t sample_rate, channels, palette[256];
54
55 magic = avio_rb32(pb);
56 avio_skip(pb, 4); // skip movie size
57
58 if (magic == MKBETAG('A', 'N', 'I', 'M')) {
59 if (avio_rb32(pb) != MKBETAG('A', 'H', 'D', 'R'))
60 return AVERROR_INVALIDDATA;
61
62 size = avio_rb32(pb);
63 if (size < 3 * 256 + 6)
64 return AVERROR_INVALIDDATA;
65
66 smush->version = 0;
67 subversion = avio_rl16(pb);
68 nframes = avio_rl16(pb);
69 if (!nframes)
70 return AVERROR_INVALIDDATA;
71
72 avio_skip(pb, 2); // skip pad
73
74 for (i = 0; i < 256; i++)
75 palette[i] = avio_rb24(pb);
76
77 avio_skip(pb, size - (3 * 256 + 6));
78 } else if (magic == MKBETAG('S', 'A', 'N', 'M')) {
79 if (avio_rb32(pb) != MKBETAG('S', 'H', 'D', 'R'))
80 return AVERROR_INVALIDDATA;
81
82 size = avio_rb32(pb);
83 if (size < 14)
84 return AVERROR_INVALIDDATA;
85
86 smush->version = 1;
87 subversion = avio_rl16(pb);
88 nframes = avio_rl32(pb);
89 if (!nframes)
90 return AVERROR_INVALIDDATA;
91
92 avio_skip(pb, 2); // skip pad
93 width = avio_rl16(pb);
94 height = avio_rl16(pb);
95 avio_skip(pb, 2); // skip pad
96 avio_skip(pb, size - 14);
97
98 if (avio_rb32(pb) != MKBETAG('F', 'L', 'H', 'D'))
99 return AVERROR_INVALIDDATA;
100
101 size = avio_rb32(pb);
102 while (!got_audio && ((read + 8) < size)) {
103 uint32_t sig, chunk_size;
104
105 if (avio_feof(pb))
106 return AVERROR_EOF;
107
108 sig = avio_rb32(pb);
109 chunk_size = avio_rb32(pb);
110 read += 8;
111 switch (sig) {
112 case MKBETAG('W', 'a', 'v', 'e'):
113 got_audio = 1;
114 sample_rate = avio_rl32(pb);
115 if (!sample_rate)
116 return AVERROR_INVALIDDATA;
117
118 channels = avio_rl32(pb);
119 if (!channels)
120 return AVERROR_INVALIDDATA;
121
122 avio_skip(pb, chunk_size - 8);
123 read += chunk_size;
124 break;
125 case MKBETAG('B', 'l', '1', '6'):
126 case MKBETAG('A', 'N', 'N', 'O'):
127 avio_skip(pb, chunk_size);
128 read += chunk_size;
129 break;
130 default:
131 return AVERROR_INVALIDDATA;
132 }
133 }
134
135 avio_skip(pb, size - read);
136 } else {
137 av_log(ctx, AV_LOG_ERROR, "Wrong magic\n");
138 return AVERROR_INVALIDDATA;
139 }
140
141 vst = avformat_new_stream(ctx, 0);
142 if (!vst)
143 return AVERROR(ENOMEM);
144
145 smush->video_stream_index = vst->index;
146
147 avpriv_set_pts_info(vst, 64, 1, 15);
148
149 vst->start_time = 0;
150 vst->duration =
151 vst->nb_frames = nframes;
152 vst->avg_frame_rate = av_inv_q(vst->time_base);
153 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
154 vst->codecpar->codec_id = AV_CODEC_ID_SANM;
155 vst->codecpar->codec_tag = 0;
156 vst->codecpar->width = width;
157 vst->codecpar->height = height;
158
159 if (!smush->version) {
160 if (ff_alloc_extradata(vst->codecpar, 1024 + 2))
161 return AVERROR(ENOMEM);
162
163 AV_WL16(vst->codecpar->extradata, subversion);
164 for (i = 0; i < 256; i++)
165 AV_WL32(vst->codecpar->extradata + 2 + i * 4, palette[i]);
166 }
167
168 if (got_audio) {
169 ast = avformat_new_stream(ctx, 0);
170 if (!ast)
171 return AVERROR(ENOMEM);
172
173 smush->audio_stream_index = ast->index;
174
175 ast->start_time = 0;
176 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
177 ast->codecpar->codec_id = AV_CODEC_ID_ADPCM_VIMA;
178 ast->codecpar->codec_tag = 0;
179 ast->codecpar->sample_rate = sample_rate;
180 ast->codecpar->channels = channels;
181
182 avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
183 }
184
185 return 0;
186}
187
188static int smush_read_packet(AVFormatContext *ctx, AVPacket *pkt)
189{
190 SMUSHContext *smush = ctx->priv_data;
191 AVIOContext *pb = ctx->pb;
192 int done = 0;
193 int ret;
194
195 while (!done) {
196 uint32_t sig, size;
197
198 if (avio_feof(pb))
199 return AVERROR_EOF;
200
201 sig = avio_rb32(pb);
202 size = avio_rb32(pb);
203
204 switch (sig) {
205 case MKBETAG('F', 'R', 'M', 'E'):
206 if (smush->version)
207 break;
208 if ((ret = av_get_packet(pb, pkt, size)) < 0)
209 return ret;
210
211 pkt->stream_index = smush->video_stream_index;
212 done = 1;
213 break;
214 case MKBETAG('B', 'l', '1', '6'):
215 if ((ret = av_get_packet(pb, pkt, size)) < 0)
216 return ret;
217
218 pkt->stream_index = smush->video_stream_index;
219 pkt->duration = 1;
220 done = 1;
221 break;
222 case MKBETAG('W', 'a', 'v', 'e'):
223 if (size < 13)
224 return AVERROR_INVALIDDATA;
225 if (av_get_packet(pb, pkt, size) < 13)
226 return AVERROR(EIO);
227
228 pkt->stream_index = smush->audio_stream_index;
229 pkt->flags |= AV_PKT_FLAG_KEY;
230 pkt->duration = AV_RB32(pkt->data);
231 if (pkt->duration == 0xFFFFFFFFu)
232 pkt->duration = AV_RB32(pkt->data + 8);
233 done = 1;
234 break;
235 default:
236 avio_skip(pb, size);
237 break;
238 }
239 }
240
241 return 0;
242}
243
244AVInputFormat ff_smush_demuxer = {
245 .name = "smush",
246 .long_name = NULL_IF_CONFIG_SMALL("LucasArts Smush"),
247 .priv_data_size = sizeof(SMUSHContext),
248 .read_probe = smush_read_probe,
249 .read_header = smush_read_header,
250 .read_packet = smush_read_packet,
251};
252
generated by cgit at 2024-05-17 06:10:28 (GMT)