3 * Copyright (c) 2006 Konstantin Shishkov
5 * This file is part of FFmpeg.
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.
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.
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
23 * Based on http://wiki.multimedia.cx/index.php?title=Smacker
26 #include "libavutil/bswap.h"
27 #include "libavutil/intreadwrite.h"
30 #define SMACKER_PAL 0x01
31 #define SMACKER_FLAG_RING_FRAME 0x01
34 SMK_AUD_PACKED = 0x80,
35 SMK_AUD_16BITS = 0x20,
36 SMK_AUD_STEREO = 0x10,
37 SMK_AUD_BINKAUD = 0x08,
41 typedef struct SmackerContext {
42 /* Smacker file header */
44 uint32_t width, height;
50 uint32_t mmap_size, mclr_size, full_size, type_size;
57 /* internal variables */
61 /* current frame for demuxing */
73 typedef struct SmackerFrame {
78 /* palette used in Smacker */
79 static const uint8_t smk_pal[64] = {
80 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
81 0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
82 0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
83 0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
84 0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
85 0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
86 0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
87 0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
91 static int smacker_probe(AVProbeData *p)
93 if(p->buf[0] == 'S' && p->buf[1] == 'M' && p->buf[2] == 'K'
94 && (p->buf[3] == '2' || p->buf[3] == '4'))
95 return AVPROBE_SCORE_MAX;
100 static int smacker_read_header(AVFormatContext *s, AVFormatParameters *ap)
102 AVIOContext *pb = s->pb;
103 SmackerContext *smk = s->priv_data;
104 AVStream *st, *ast[7];
108 /* read and check header */
109 smk->magic = avio_rl32(pb);
110 if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4'))
112 smk->width = avio_rl32(pb);
113 smk->height = avio_rl32(pb);
114 smk->frames = avio_rl32(pb);
115 smk->pts_inc = (int32_t)avio_rl32(pb);
116 smk->flags = avio_rl32(pb);
117 if(smk->flags & SMACKER_FLAG_RING_FRAME)
119 for(i = 0; i < 7; i++)
120 smk->audio[i] = avio_rl32(pb);
121 smk->treesize = avio_rl32(pb);
123 if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant)
124 av_log(s, AV_LOG_ERROR, "treesize too large\n");
128 //FIXME remove extradata "rebuilding"
129 smk->mmap_size = avio_rl32(pb);
130 smk->mclr_size = avio_rl32(pb);
131 smk->full_size = avio_rl32(pb);
132 smk->type_size = avio_rl32(pb);
133 for(i = 0; i < 7; i++) {
134 smk->rates[i] = avio_rl24(pb);
135 smk->aflags[i] = avio_r8(pb);
137 smk->pad = avio_rl32(pb);
139 if(smk->frames > 0xFFFFFF) {
140 av_log(s, AV_LOG_ERROR, "Too many frames: %i\n", smk->frames);
143 smk->frm_size = av_malloc(smk->frames * 4);
144 smk->frm_flags = av_malloc(smk->frames);
146 smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));
148 /* read frame info */
149 for(i = 0; i < smk->frames; i++) {
150 smk->frm_size[i] = avio_rl32(pb);
152 for(i = 0; i < smk->frames; i++) {
153 smk->frm_flags[i] = avio_r8(pb);
156 /* init video codec */
157 st = av_new_stream(s, 0);
160 smk->videoindex = st->index;
161 st->codec->width = smk->width;
162 st->codec->height = smk->height;
163 st->codec->pix_fmt = PIX_FMT_PAL8;
164 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
165 st->codec->codec_id = CODEC_ID_SMACKVIDEO;
166 st->codec->codec_tag = smk->magic;
167 /* Smacker uses 100000 as internal timebase */
169 smk->pts_inc = -smk->pts_inc;
173 av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);
174 av_set_pts_info(st, 33, smk->pts_inc, tbase);
175 st->duration = smk->frames;
176 /* handle possible audio streams */
177 for(i = 0; i < 7; i++) {
178 smk->indexes[i] = -1;
180 ast[i] = av_new_stream(s, 0);
181 smk->indexes[i] = ast[i]->index;
182 ast[i]->codec->codec_type = AVMEDIA_TYPE_AUDIO;
183 if (smk->aflags[i] & SMK_AUD_BINKAUD) {
184 ast[i]->codec->codec_id = CODEC_ID_BINKAUDIO_RDFT;
185 } else if (smk->aflags[i] & SMK_AUD_USEDCT) {
186 ast[i]->codec->codec_id = CODEC_ID_BINKAUDIO_DCT;
187 } else if (smk->aflags[i] & SMK_AUD_PACKED){
188 ast[i]->codec->codec_id = CODEC_ID_SMACKAUDIO;
189 ast[i]->codec->codec_tag = MKTAG('S', 'M', 'K', 'A');
191 ast[i]->codec->codec_id = CODEC_ID_PCM_U8;
193 ast[i]->codec->channels = (smk->aflags[i] & SMK_AUD_STEREO) ? 2 : 1;
194 ast[i]->codec->sample_rate = smk->rates[i];
195 ast[i]->codec->bits_per_coded_sample = (smk->aflags[i] & SMK_AUD_16BITS) ? 16 : 8;
196 if(ast[i]->codec->bits_per_coded_sample == 16 && ast[i]->codec->codec_id == CODEC_ID_PCM_U8)
197 ast[i]->codec->codec_id = CODEC_ID_PCM_S16LE;
198 av_set_pts_info(ast[i], 64, 1, ast[i]->codec->sample_rate
199 * ast[i]->codec->channels * ast[i]->codec->bits_per_coded_sample / 8);
204 /* load trees to extradata, they will be unpacked by decoder */
205 st->codec->extradata = av_malloc(smk->treesize + 16);
206 st->codec->extradata_size = smk->treesize + 16;
207 if(!st->codec->extradata){
208 av_log(s, AV_LOG_ERROR, "Cannot allocate %i bytes of extradata\n", smk->treesize + 16);
209 av_free(smk->frm_size);
210 av_free(smk->frm_flags);
213 ret = avio_read(pb, st->codec->extradata + 16, st->codec->extradata_size - 16);
214 if(ret != st->codec->extradata_size - 16){
215 av_free(smk->frm_size);
216 av_free(smk->frm_flags);
219 ((int32_t*)st->codec->extradata)[0] = av_le2ne32(smk->mmap_size);
220 ((int32_t*)st->codec->extradata)[1] = av_le2ne32(smk->mclr_size);
221 ((int32_t*)st->codec->extradata)[2] = av_le2ne32(smk->full_size);
222 ((int32_t*)st->codec->extradata)[3] = av_le2ne32(smk->type_size);
225 smk->nextpos = avio_tell(pb);
231 static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
233 SmackerContext *smk = s->priv_data;
240 if (url_feof(s->pb) || smk->cur_frame >= smk->frames)
243 /* if we demuxed all streams, pass another frame */
244 if(smk->curstream < 0) {
245 avio_seek(s->pb, smk->nextpos, 0);
246 frame_size = smk->frm_size[smk->cur_frame] & (~3);
247 flags = smk->frm_flags[smk->cur_frame];
248 /* handle palette change event */
249 if(flags & SMACKER_PAL){
250 int size, sz, t, off, j, pos;
251 uint8_t *pal = smk->pal;
254 memcpy(oldpal, pal, 768);
255 size = avio_r8(s->pb);
260 pos = avio_tell(s->pb) + size;
263 if(t & 0x80){ /* skip palette entries */
264 sz += (t & 0x7F) + 1;
265 pal += ((t & 0x7F) + 1) * 3;
266 } else if(t & 0x40){ /* copy with offset */
267 off = avio_r8(s->pb) * 3;
269 while(j-- && sz < 256) {
270 *pal++ = oldpal[off + 0];
271 *pal++ = oldpal[off + 1];
272 *pal++ = oldpal[off + 2];
276 } else { /* new entries */
278 *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
279 *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
283 avio_seek(s->pb, pos, 0);
288 /* if audio chunks are present, put them to stack and retrieve later */
289 for(i = 0; i < 7; i++) {
294 size = avio_rl32(s->pb) - 4;
298 tmpbuf = av_realloc(smk->bufs[smk->curstream], size);
300 return AVERROR(ENOMEM);
301 smk->bufs[smk->curstream] = tmpbuf;
302 smk->buf_sizes[smk->curstream] = size;
303 ret = avio_read(s->pb, smk->bufs[smk->curstream], size);
306 smk->stream_id[smk->curstream] = smk->indexes[i];
311 return AVERROR_INVALIDDATA;
312 if (av_new_packet(pkt, frame_size + 769))
313 return AVERROR(ENOMEM);
314 if(smk->frm_size[smk->cur_frame] & 1)
316 pkt->data[0] = palchange;
317 memcpy(pkt->data + 1, smk->pal, 768);
318 ret = avio_read(s->pb, pkt->data + 769, frame_size);
319 if(ret != frame_size)
321 pkt->stream_index = smk->videoindex;
322 pkt->size = ret + 769;
324 smk->nextpos = avio_tell(s->pb);
326 if (av_new_packet(pkt, smk->buf_sizes[smk->curstream]))
327 return AVERROR(ENOMEM);
328 memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);
329 pkt->size = smk->buf_sizes[smk->curstream];
330 pkt->stream_index = smk->stream_id[smk->curstream];
331 pkt->pts = smk->aud_pts[smk->curstream];
332 smk->aud_pts[smk->curstream] += AV_RL32(pkt->data);
339 static int smacker_read_close(AVFormatContext *s)
341 SmackerContext *smk = s->priv_data;
344 for(i = 0; i < 7; i++)
345 av_free(smk->bufs[i]);
346 av_free(smk->frm_size);
347 av_free(smk->frm_flags);
352 AVInputFormat ff_smacker_demuxer = {
354 .long_name = NULL_IF_CONFIG_SMALL("Smacker video"),
355 .priv_data_size = sizeof(SmackerContext),
356 .read_probe = smacker_probe,
357 .read_header = smacker_read_header,
358 .read_packet = smacker_read_packet,
359 .read_close = smacker_read_close,