3 * Copyright (c) 2006 Konstantin Shishkov.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 * Based on http://wiki.multimedia.cx/index.php?title=Smacker
28 #define SMACKER_PAL 0x01
31 SMK_AUD_PACKED = 0x80000000,
32 SMK_AUD_16BITS = 0x20000000,
33 SMK_AUD_STEREO = 0x10000000,
34 SMK_AUD_BINKAUD = 0x08000000,
35 SMK_AUD_USEDCT = 0x04000000
38 typedef struct SmackerContext {
39 /* Smacker file header */
41 uint32_t width, height;
47 uint32_t mmap_size, mclr_size, full_size, type_size;
53 /* internal variables */
57 /* current frame for demuxing */
68 typedef struct SmackerFrame {
73 /* palette used in Smacker */
74 static const uint8_t smk_pal[64] = {
75 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
76 0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
77 0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
78 0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
79 0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
80 0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
81 0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
82 0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
86 static int smacker_probe(AVProbeData *p)
90 if(p->buf[0] == 'S' && p->buf[1] == 'M' && p->buf[2] == 'K'
91 && (p->buf[3] == '2' || p->buf[3] == '4'))
92 return AVPROBE_SCORE_MAX;
97 static int smacker_read_header(AVFormatContext *s, AVFormatParameters *ap)
99 ByteIOContext *pb = &s->pb;
100 SmackerContext *smk = (SmackerContext *)s->priv_data;
101 AVStream *st, *ast[7];
105 /* read and check header */
106 smk->magic = get_le32(pb);
107 if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4'))
109 smk->width = get_le32(pb);
110 smk->height = get_le32(pb);
111 smk->frames = get_le32(pb);
112 smk->pts_inc = (int32_t)get_le32(pb);
113 smk->flags = get_le32(pb);
114 for(i = 0; i < 7; i++)
115 smk->audio[i] = get_le32(pb);
116 smk->treesize = get_le32(pb);
118 if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant)
119 av_log(s, AV_LOG_ERROR, "treesize too large\n");
123 //FIXME remove extradata "rebuilding"
124 smk->mmap_size = get_le32(pb);
125 smk->mclr_size = get_le32(pb);
126 smk->full_size = get_le32(pb);
127 smk->type_size = get_le32(pb);
128 for(i = 0; i < 7; i++)
129 smk->rates[i] = get_le32(pb);
130 smk->pad = get_le32(pb);
132 if(smk->frames > 0xFFFFFF) {
133 av_log(s, AV_LOG_ERROR, "Too many frames: %i\n", smk->frames);
136 smk->frm_size = av_malloc(smk->frames * 4);
137 smk->frm_flags = av_malloc(smk->frames);
139 smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));
141 /* read frame info */
142 for(i = 0; i < smk->frames; i++) {
143 smk->frm_size[i] = get_le32(pb);
145 for(i = 0; i < smk->frames; i++) {
146 smk->frm_flags[i] = get_byte(pb);
149 /* init video codec */
150 st = av_new_stream(s, 0);
153 smk->videoindex = st->index;
154 st->codec->width = smk->width;
155 st->codec->height = smk->height;
156 st->codec->pix_fmt = PIX_FMT_PAL8;
157 st->codec->codec_type = CODEC_TYPE_VIDEO;
158 st->codec->codec_id = CODEC_ID_SMACKVIDEO;
159 st->codec->codec_tag = smk->is_ver4;
160 /* Smacker uses 100000 as internal timebase */
162 smk->pts_inc = -smk->pts_inc;
166 av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);
167 av_set_pts_info(st, 33, smk->pts_inc, tbase);
168 /* handle possible audio streams */
169 for(i = 0; i < 7; i++) {
170 smk->indexes[i] = -1;
171 if((smk->rates[i] & 0xFFFFFF) && !(smk->rates[i] & SMK_AUD_BINKAUD)){
172 ast[i] = av_new_stream(s, 0);
173 smk->indexes[i] = ast[i]->index;
174 av_set_pts_info(ast[i], 33, smk->pts_inc, tbase);
175 ast[i]->codec->codec_type = CODEC_TYPE_AUDIO;
176 ast[i]->codec->codec_id = (smk->rates[i] & SMK_AUD_PACKED) ? CODEC_ID_SMACKAUDIO : CODEC_ID_PCM_U8;
177 ast[i]->codec->codec_tag = 0;
178 ast[i]->codec->channels = (smk->rates[i] & SMK_AUD_STEREO) ? 2 : 1;
179 ast[i]->codec->sample_rate = smk->rates[i] & 0xFFFFFF;
180 ast[i]->codec->bits_per_sample = (smk->rates[i] & SMK_AUD_16BITS) ? 16 : 8;
181 if(ast[i]->codec->bits_per_sample == 16 && ast[i]->codec->codec_id == CODEC_ID_PCM_U8)
182 ast[i]->codec->codec_id = CODEC_ID_PCM_S16LE;
187 /* load trees to extradata, they will be unpacked by decoder */
188 st->codec->extradata = av_malloc(smk->treesize + 16);
189 st->codec->extradata_size = smk->treesize + 16;
190 if(!st->codec->extradata){
191 av_log(s, AV_LOG_ERROR, "Cannot allocate %i bytes of extradata\n", smk->treesize + 16);
192 av_free(smk->frm_size);
193 av_free(smk->frm_flags);
196 ret = get_buffer(pb, st->codec->extradata + 16, st->codec->extradata_size - 16);
197 if(ret != st->codec->extradata_size - 16){
198 av_free(smk->frm_size);
199 av_free(smk->frm_flags);
202 ((int32_t*)st->codec->extradata)[0] = le2me_32(smk->mmap_size);
203 ((int32_t*)st->codec->extradata)[1] = le2me_32(smk->mclr_size);
204 ((int32_t*)st->codec->extradata)[2] = le2me_32(smk->full_size);
205 ((int32_t*)st->codec->extradata)[3] = le2me_32(smk->type_size);
208 smk->nextpos = url_ftell(pb);
214 static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
216 SmackerContext *smk = (SmackerContext *)s->priv_data;
224 if (url_feof(&s->pb) || smk->cur_frame >= smk->frames)
227 /* if we demuxed all streams, pass another frame */
228 if(smk->curstream < 0) {
229 url_fseek(&s->pb, smk->nextpos, 0);
230 frame_size = smk->frm_size[smk->cur_frame] & (~3);
231 flags = smk->frm_flags[smk->cur_frame];
232 /* handle palette change event */
233 pos = url_ftell(&s->pb);
234 if(flags & SMACKER_PAL){
235 int size, sz, t, off, j, pos;
236 uint8_t *pal = smk->pal;
239 memcpy(oldpal, pal, 768);
240 size = get_byte(&s->pb);
245 pos = url_ftell(&s->pb) + size;
247 t = get_byte(&s->pb);
248 if(t & 0x80){ /* skip palette entries */
249 sz += (t & 0x7F) + 1;
250 pal += ((t & 0x7F) + 1) * 3;
251 } else if(t & 0x40){ /* copy with offset */
252 off = get_byte(&s->pb) * 3;
254 while(j-- && sz < 256) {
255 *pal++ = oldpal[off + 0];
256 *pal++ = oldpal[off + 1];
257 *pal++ = oldpal[off + 2];
261 } else { /* new entries */
263 *pal++ = smk_pal[get_byte(&s->pb) & 0x3F];
264 *pal++ = smk_pal[get_byte(&s->pb) & 0x3F];
268 url_fseek(&s->pb, pos, 0);
273 /* if audio chunks are present, put them to stack and retrieve later */
274 for(i = 0; i < 7; i++) {
277 size = get_le32(&s->pb) - 4;
281 smk->bufs[smk->curstream] = av_realloc(smk->bufs[smk->curstream], size);
282 smk->buf_sizes[smk->curstream] = size;
283 ret = get_buffer(&s->pb, smk->bufs[smk->curstream], size);
286 smk->stream_id[smk->curstream] = smk->indexes[i];
290 if (av_new_packet(pkt, frame_size + 768))
291 return AVERROR_NOMEM;
292 if(smk->frm_size[smk->cur_frame] & 1)
294 pkt->data[0] = palchange;
295 memcpy(pkt->data + 1, smk->pal, 768);
296 ret = get_buffer(&s->pb, pkt->data + 769, frame_size);
297 if(ret != frame_size)
299 pkt->stream_index = smk->videoindex;
300 pkt->size = ret + 769;
302 smk->nextpos = url_ftell(&s->pb);
304 if (av_new_packet(pkt, smk->buf_sizes[smk->curstream]))
305 return AVERROR_NOMEM;
306 memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);
307 pkt->size = smk->buf_sizes[smk->curstream];
308 pkt->stream_index = smk->stream_id[smk->curstream];
315 static int smacker_read_close(AVFormatContext *s)
317 SmackerContext *smk = (SmackerContext *)s->priv_data;
320 for(i = 0; i < 7; i++)
322 av_free(smk->bufs[i]);
324 av_free(smk->frm_size);
326 av_free(smk->frm_flags);
328 for(i=0;i<s->nb_streams;i++) {
329 AVStream *st = s->streams[i];
330 if(st->codec->extradata)
331 av_free(st->codec->extradata);
336 static AVInputFormat smacker_iformat = {
339 sizeof(SmackerContext),
346 int smacker_init(void)
348 av_register_input_format(&smacker_iformat);