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"
31 #define SMACKER_PAL 0x01
32 #define SMACKER_FLAG_RING_FRAME 0x01
35 SMK_AUD_PACKED = 0x80,
36 SMK_AUD_16BITS = 0x20,
37 SMK_AUD_STEREO = 0x10,
38 SMK_AUD_BINKAUD = 0x08,
42 typedef struct SmackerContext {
43 /* Smacker file header */
45 uint32_t width, height;
51 uint32_t mmap_size, mclr_size, full_size, type_size;
58 /* internal variables */
62 /* current frame for demuxing */
74 typedef struct SmackerFrame {
79 /* palette used in Smacker */
80 static const uint8_t smk_pal[64] = {
81 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
82 0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
83 0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
84 0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
85 0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
86 0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
87 0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
88 0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
92 static int smacker_probe(AVProbeData *p)
94 if(p->buf[0] == 'S' && p->buf[1] == 'M' && p->buf[2] == 'K'
95 && (p->buf[3] == '2' || p->buf[3] == '4'))
96 return AVPROBE_SCORE_MAX;
101 static int smacker_read_header(AVFormatContext *s)
103 AVIOContext *pb = s->pb;
104 SmackerContext *smk = s->priv_data;
105 AVStream *st, *ast[7];
109 /* read and check header */
110 smk->magic = avio_rl32(pb);
111 if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4'))
113 smk->width = avio_rl32(pb);
114 smk->height = avio_rl32(pb);
115 smk->frames = avio_rl32(pb);
116 smk->pts_inc = (int32_t)avio_rl32(pb);
117 smk->flags = avio_rl32(pb);
118 if(smk->flags & SMACKER_FLAG_RING_FRAME)
120 for(i = 0; i < 7; i++)
121 smk->audio[i] = avio_rl32(pb);
122 smk->treesize = avio_rl32(pb);
124 if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant)
125 av_log(s, AV_LOG_ERROR, "treesize too large\n");
129 //FIXME remove extradata "rebuilding"
130 smk->mmap_size = avio_rl32(pb);
131 smk->mclr_size = avio_rl32(pb);
132 smk->full_size = avio_rl32(pb);
133 smk->type_size = avio_rl32(pb);
134 for(i = 0; i < 7; i++) {
135 smk->rates[i] = avio_rl24(pb);
136 smk->aflags[i] = avio_r8(pb);
138 smk->pad = avio_rl32(pb);
140 if(smk->frames > 0xFFFFFF) {
141 av_log(s, AV_LOG_ERROR, "Too many frames: %i\n", smk->frames);
144 smk->frm_size = av_malloc(smk->frames * 4);
145 smk->frm_flags = av_malloc(smk->frames);
147 smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));
149 /* read frame info */
150 for(i = 0; i < smk->frames; i++) {
151 smk->frm_size[i] = avio_rl32(pb);
153 for(i = 0; i < smk->frames; i++) {
154 smk->frm_flags[i] = avio_r8(pb);
157 /* init video codec */
158 st = avformat_new_stream(s, NULL);
161 smk->videoindex = st->index;
162 st->codec->width = smk->width;
163 st->codec->height = smk->height;
164 st->codec->pix_fmt = PIX_FMT_PAL8;
165 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
166 st->codec->codec_id = CODEC_ID_SMACKVIDEO;
167 st->codec->codec_tag = smk->magic;
168 /* Smacker uses 100000 as internal timebase */
170 smk->pts_inc = -smk->pts_inc;
174 av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);
175 avpriv_set_pts_info(st, 33, smk->pts_inc, tbase);
176 st->duration = smk->frames;
177 /* handle possible audio streams */
178 for(i = 0; i < 7; i++) {
179 smk->indexes[i] = -1;
181 ast[i] = avformat_new_stream(s, NULL);
182 smk->indexes[i] = ast[i]->index;
183 ast[i]->codec->codec_type = AVMEDIA_TYPE_AUDIO;
184 if (smk->aflags[i] & SMK_AUD_BINKAUD) {
185 ast[i]->codec->codec_id = CODEC_ID_BINKAUDIO_RDFT;
186 } else if (smk->aflags[i] & SMK_AUD_USEDCT) {
187 ast[i]->codec->codec_id = CODEC_ID_BINKAUDIO_DCT;
188 } else if (smk->aflags[i] & SMK_AUD_PACKED){
189 ast[i]->codec->codec_id = CODEC_ID_SMACKAUDIO;
190 ast[i]->codec->codec_tag = MKTAG('S', 'M', 'K', 'A');
192 ast[i]->codec->codec_id = CODEC_ID_PCM_U8;
194 ast[i]->codec->channels = (smk->aflags[i] & SMK_AUD_STEREO) ? 2 : 1;
195 ast[i]->codec->sample_rate = smk->rates[i];
196 ast[i]->codec->bits_per_coded_sample = (smk->aflags[i] & SMK_AUD_16BITS) ? 16 : 8;
197 if(ast[i]->codec->bits_per_coded_sample == 16 && ast[i]->codec->codec_id == CODEC_ID_PCM_U8)
198 ast[i]->codec->codec_id = CODEC_ID_PCM_S16LE;
199 avpriv_set_pts_info(ast[i], 64, 1, ast[i]->codec->sample_rate
200 * ast[i]->codec->channels * ast[i]->codec->bits_per_coded_sample / 8);
205 /* load trees to extradata, they will be unpacked by decoder */
206 st->codec->extradata = av_malloc(smk->treesize + 16 + FF_INPUT_BUFFER_PADDING_SIZE);
207 st->codec->extradata_size = smk->treesize + 16;
208 if(!st->codec->extradata){
209 av_log(s, AV_LOG_ERROR, "Cannot allocate %i bytes of extradata\n", smk->treesize + 16);
210 av_free(smk->frm_size);
211 av_free(smk->frm_flags);
214 ret = avio_read(pb, st->codec->extradata + 16, st->codec->extradata_size - 16);
215 if(ret != st->codec->extradata_size - 16){
216 av_free(smk->frm_size);
217 av_free(smk->frm_flags);
220 ((int32_t*)st->codec->extradata)[0] = av_le2ne32(smk->mmap_size);
221 ((int32_t*)st->codec->extradata)[1] = av_le2ne32(smk->mclr_size);
222 ((int32_t*)st->codec->extradata)[2] = av_le2ne32(smk->full_size);
223 ((int32_t*)st->codec->extradata)[3] = av_le2ne32(smk->type_size);
226 smk->nextpos = avio_tell(pb);
232 static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
234 SmackerContext *smk = s->priv_data;
241 if (url_feof(s->pb) || smk->cur_frame >= smk->frames)
244 /* if we demuxed all streams, pass another frame */
245 if(smk->curstream < 0) {
246 avio_seek(s->pb, smk->nextpos, 0);
247 frame_size = smk->frm_size[smk->cur_frame] & (~3);
248 flags = smk->frm_flags[smk->cur_frame];
249 /* handle palette change event */
250 if(flags & SMACKER_PAL){
251 int size, sz, t, off, j, pos;
252 uint8_t *pal = smk->pal;
255 memcpy(oldpal, pal, 768);
256 size = avio_r8(s->pb);
258 if(size + 1 > frame_size)
259 return AVERROR_INVALIDDATA;
263 pos = avio_tell(s->pb) + size;
266 if(t & 0x80){ /* skip palette entries */
267 sz += (t & 0x7F) + 1;
268 pal += ((t & 0x7F) + 1) * 3;
269 } else if(t & 0x40){ /* copy with offset */
270 off = avio_r8(s->pb);
272 if (off + j > 0xff) {
273 av_log(s, AV_LOG_ERROR,
274 "Invalid palette update, offset=%d length=%d extends beyond palette size\n",
276 return AVERROR_INVALIDDATA;
279 while(j-- && sz < 256) {
280 *pal++ = oldpal[off + 0];
281 *pal++ = oldpal[off + 1];
282 *pal++ = oldpal[off + 2];
286 } else { /* new entries */
288 *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
289 *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
293 avio_seek(s->pb, pos, 0);
298 /* if audio chunks are present, put them to stack and retrieve later */
299 for(i = 0; i < 7; i++) {
304 size = avio_rl32(s->pb) - 4;
305 if(size + 4L > frame_size)
306 return AVERROR_INVALIDDATA;
310 tmpbuf = av_realloc(smk->bufs[smk->curstream], size);
312 return AVERROR(ENOMEM);
313 smk->bufs[smk->curstream] = tmpbuf;
314 smk->buf_sizes[smk->curstream] = size;
315 ret = avio_read(s->pb, smk->bufs[smk->curstream], size);
318 smk->stream_id[smk->curstream] = smk->indexes[i];
323 return AVERROR_INVALIDDATA;
324 if (av_new_packet(pkt, frame_size + 769))
325 return AVERROR(ENOMEM);
326 if(smk->frm_size[smk->cur_frame] & 1)
328 pkt->data[0] = palchange;
329 memcpy(pkt->data + 1, smk->pal, 768);
330 ret = avio_read(s->pb, pkt->data + 769, frame_size);
331 if(ret != frame_size)
333 pkt->stream_index = smk->videoindex;
334 pkt->size = ret + 769;
336 smk->nextpos = avio_tell(s->pb);
338 if (av_new_packet(pkt, smk->buf_sizes[smk->curstream]))
339 return AVERROR(ENOMEM);
340 memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);
341 pkt->size = smk->buf_sizes[smk->curstream];
342 pkt->stream_index = smk->stream_id[smk->curstream];
343 pkt->pts = smk->aud_pts[smk->curstream];
344 smk->aud_pts[smk->curstream] += AV_RL32(pkt->data);
351 static int smacker_read_close(AVFormatContext *s)
353 SmackerContext *smk = s->priv_data;
356 for(i = 0; i < 7; i++)
357 av_free(smk->bufs[i]);
358 av_free(smk->frm_size);
359 av_free(smk->frm_flags);
364 AVInputFormat ff_smacker_demuxer = {
366 .long_name = NULL_IF_CONFIG_SMALL("Smacker"),
367 .priv_data_size = sizeof(SmackerContext),
368 .read_probe = smacker_probe,
369 .read_header = smacker_read_header,
370 .read_packet = smacker_read_packet,
371 .read_close = smacker_read_close,