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
28 #include "libavutil/bswap.h"
29 #include "libavutil/channel_layout.h"
30 #include "libavutil/intreadwrite.h"
34 #define SMACKER_PAL 0x01
35 #define SMACKER_FLAG_RING_FRAME 0x01
38 SMK_AUD_PACKED = 0x80,
39 SMK_AUD_16BITS = 0x20,
40 SMK_AUD_STEREO = 0x10,
41 SMK_AUD_BINKAUD = 0x08,
45 typedef struct SmackerContext {
46 /* Smacker file header */
48 uint32_t width, height;
54 uint32_t mmap_size, mclr_size, full_size, type_size;
61 /* internal variables */
65 /* current frame for demuxing */
77 typedef struct SmackerFrame {
82 /* palette used in Smacker */
83 static const uint8_t smk_pal[64] = {
84 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
85 0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
86 0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
87 0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
88 0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
89 0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
90 0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
91 0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
95 static int smacker_probe(const AVProbeData *p)
97 if ( AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '2')
98 && AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '4'))
101 if (AV_RL32(p->buf+4) > 32768U || AV_RL32(p->buf+8) > 32768U)
102 return AVPROBE_SCORE_MAX/4;
104 return AVPROBE_SCORE_MAX;
107 static int smacker_read_header(AVFormatContext *s)
109 AVIOContext *pb = s->pb;
110 SmackerContext *smk = s->priv_data;
111 AVStream *st, *ast[7];
115 /* read and check header */
116 smk->magic = avio_rl32(pb);
117 if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4'))
118 return AVERROR_INVALIDDATA;
119 smk->width = avio_rl32(pb);
120 smk->height = avio_rl32(pb);
121 smk->frames = avio_rl32(pb);
122 smk->pts_inc = (int32_t)avio_rl32(pb);
123 if (smk->pts_inc > INT_MAX / 100) {
124 av_log(s, AV_LOG_ERROR, "pts_inc %d is too large\n", smk->pts_inc);
125 return AVERROR_INVALIDDATA;
128 smk->flags = avio_rl32(pb);
129 if(smk->flags & SMACKER_FLAG_RING_FRAME)
131 for(i = 0; i < 7; i++)
132 smk->audio[i] = avio_rl32(pb);
133 smk->treesize = avio_rl32(pb);
135 if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant)
136 av_log(s, AV_LOG_ERROR, "treesize too large\n");
137 return AVERROR_INVALIDDATA;
140 //FIXME remove extradata "rebuilding"
141 smk->mmap_size = avio_rl32(pb);
142 smk->mclr_size = avio_rl32(pb);
143 smk->full_size = avio_rl32(pb);
144 smk->type_size = avio_rl32(pb);
145 for(i = 0; i < 7; i++) {
146 smk->rates[i] = avio_rl24(pb);
147 smk->aflags[i] = avio_r8(pb);
149 smk->pad = avio_rl32(pb);
151 if(smk->frames > 0xFFFFFF) {
152 av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n", smk->frames);
153 return AVERROR_INVALIDDATA;
155 smk->frm_size = av_malloc_array(smk->frames, sizeof(*smk->frm_size));
156 smk->frm_flags = av_malloc(smk->frames);
157 if (!smk->frm_size || !smk->frm_flags) {
158 av_freep(&smk->frm_size);
159 av_freep(&smk->frm_flags);
160 return AVERROR(ENOMEM);
163 smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));
165 /* read frame info */
166 for(i = 0; i < smk->frames; i++) {
167 smk->frm_size[i] = avio_rl32(pb);
169 for(i = 0; i < smk->frames; i++) {
170 smk->frm_flags[i] = avio_r8(pb);
173 /* init video codec */
174 st = avformat_new_stream(s, NULL);
176 av_freep(&smk->frm_size);
177 av_freep(&smk->frm_flags);
178 return AVERROR(ENOMEM);
180 smk->videoindex = st->index;
181 st->codecpar->width = smk->width;
182 st->codecpar->height = smk->height;
183 st->codecpar->format = AV_PIX_FMT_PAL8;
184 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
185 st->codecpar->codec_id = AV_CODEC_ID_SMACKVIDEO;
186 st->codecpar->codec_tag = smk->magic;
187 /* Smacker uses 100000 as internal timebase */
189 smk->pts_inc = -smk->pts_inc;
193 av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);
194 avpriv_set_pts_info(st, 33, smk->pts_inc, tbase);
195 st->duration = smk->frames;
196 /* handle possible audio streams */
197 for(i = 0; i < 7; i++) {
198 smk->indexes[i] = -1;
200 ast[i] = avformat_new_stream(s, NULL);
202 av_freep(&smk->frm_size);
203 av_freep(&smk->frm_flags);
204 return AVERROR(ENOMEM);
206 smk->indexes[i] = ast[i]->index;
207 ast[i]->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
208 if (smk->aflags[i] & SMK_AUD_BINKAUD) {
209 ast[i]->codecpar->codec_id = AV_CODEC_ID_BINKAUDIO_RDFT;
210 } else if (smk->aflags[i] & SMK_AUD_USEDCT) {
211 ast[i]->codecpar->codec_id = AV_CODEC_ID_BINKAUDIO_DCT;
212 } else if (smk->aflags[i] & SMK_AUD_PACKED){
213 ast[i]->codecpar->codec_id = AV_CODEC_ID_SMACKAUDIO;
214 ast[i]->codecpar->codec_tag = MKTAG('S', 'M', 'K', 'A');
216 ast[i]->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
218 if (smk->aflags[i] & SMK_AUD_STEREO) {
219 ast[i]->codecpar->channels = 2;
220 ast[i]->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
222 ast[i]->codecpar->channels = 1;
223 ast[i]->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
225 ast[i]->codecpar->sample_rate = smk->rates[i];
226 ast[i]->codecpar->bits_per_coded_sample = (smk->aflags[i] & SMK_AUD_16BITS) ? 16 : 8;
227 if(ast[i]->codecpar->bits_per_coded_sample == 16 && ast[i]->codecpar->codec_id == AV_CODEC_ID_PCM_U8)
228 ast[i]->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
229 avpriv_set_pts_info(ast[i], 64, 1, ast[i]->codecpar->sample_rate
230 * ast[i]->codecpar->channels * ast[i]->codecpar->bits_per_coded_sample / 8);
235 /* load trees to extradata, they will be unpacked by decoder */
236 if ((ret = ff_alloc_extradata(st->codecpar, smk->treesize + 16)) < 0) {
237 av_log(s, AV_LOG_ERROR,
238 "Cannot allocate %"PRIu32" bytes of extradata\n",
240 av_freep(&smk->frm_size);
241 av_freep(&smk->frm_flags);
244 ret = avio_read(pb, st->codecpar->extradata + 16, st->codecpar->extradata_size - 16);
245 if(ret != st->codecpar->extradata_size - 16){
246 av_freep(&smk->frm_size);
247 av_freep(&smk->frm_flags);
250 ((int32_t*)st->codecpar->extradata)[0] = av_le2ne32(smk->mmap_size);
251 ((int32_t*)st->codecpar->extradata)[1] = av_le2ne32(smk->mclr_size);
252 ((int32_t*)st->codecpar->extradata)[2] = av_le2ne32(smk->full_size);
253 ((int32_t*)st->codecpar->extradata)[3] = av_le2ne32(smk->type_size);
256 smk->nextpos = avio_tell(pb);
262 static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
264 SmackerContext *smk = s->priv_data;
271 if (avio_feof(s->pb) || smk->cur_frame >= smk->frames)
274 /* if we demuxed all streams, pass another frame */
275 if(smk->curstream < 0) {
276 avio_seek(s->pb, smk->nextpos, 0);
277 frame_size = smk->frm_size[smk->cur_frame] & (~3);
278 flags = smk->frm_flags[smk->cur_frame];
279 /* handle palette change event */
280 if(flags & SMACKER_PAL){
281 int size, sz, t, off, j, pos;
282 uint8_t *pal = smk->pal;
285 memcpy(oldpal, pal, 768);
286 size = avio_r8(s->pb);
288 if(size + 1 > frame_size)
289 return AVERROR_INVALIDDATA;
293 pos = avio_tell(s->pb) + size;
296 if(t & 0x80){ /* skip palette entries */
297 sz += (t & 0x7F) + 1;
298 pal += ((t & 0x7F) + 1) * 3;
299 } else if(t & 0x40){ /* copy with offset */
300 off = avio_r8(s->pb);
302 if (off + j > 0x100) {
303 av_log(s, AV_LOG_ERROR,
304 "Invalid palette update, offset=%d length=%d extends beyond palette size\n",
306 return AVERROR_INVALIDDATA;
309 while(j-- && sz < 256) {
310 *pal++ = oldpal[off + 0];
311 *pal++ = oldpal[off + 1];
312 *pal++ = oldpal[off + 2];
316 } else { /* new entries */
318 *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
319 *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
323 avio_seek(s->pb, pos, 0);
328 /* if audio chunks are present, put them to stack and retrieve later */
329 for(i = 0; i < 7; i++) {
334 size = avio_rl32(s->pb) - 4;
335 if (!size || size + 4LL > frame_size) {
336 av_log(s, AV_LOG_ERROR, "Invalid audio part size\n");
337 return AVERROR_INVALIDDATA;
342 if ((err = av_reallocp(&smk->bufs[smk->curstream], size)) < 0) {
343 smk->buf_sizes[smk->curstream] = 0;
346 smk->buf_sizes[smk->curstream] = size;
347 ret = avio_read(s->pb, smk->bufs[smk->curstream], size);
350 smk->stream_id[smk->curstream] = smk->indexes[i];
354 if (frame_size < 0 || frame_size >= INT_MAX/2)
355 return AVERROR_INVALIDDATA;
356 if ((ret = av_new_packet(pkt, frame_size + 769)) < 0)
358 if(smk->frm_size[smk->cur_frame] & 1)
360 pkt->data[0] = palchange;
361 memcpy(pkt->data + 1, smk->pal, 768);
362 ret = avio_read(s->pb, pkt->data + 769, frame_size);
363 if(ret != frame_size)
365 pkt->stream_index = smk->videoindex;
366 pkt->pts = smk->cur_frame;
367 pkt->size = ret + 769;
369 smk->nextpos = avio_tell(s->pb);
371 if (smk->stream_id[smk->curstream] < 0 || !smk->bufs[smk->curstream])
372 return AVERROR_INVALIDDATA;
373 if ((ret = av_new_packet(pkt, smk->buf_sizes[smk->curstream])) < 0)
375 memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);
376 pkt->size = smk->buf_sizes[smk->curstream];
377 pkt->stream_index = smk->stream_id[smk->curstream];
378 pkt->pts = smk->aud_pts[smk->curstream];
379 smk->aud_pts[smk->curstream] += AV_RL32(pkt->data);
386 static int smacker_read_close(AVFormatContext *s)
388 SmackerContext *smk = s->priv_data;
391 for(i = 0; i < 7; i++)
392 av_freep(&smk->bufs[i]);
393 av_freep(&smk->frm_size);
394 av_freep(&smk->frm_flags);
399 AVInputFormat ff_smacker_demuxer = {
401 .long_name = NULL_IF_CONFIG_SMALL("Smacker"),
402 .priv_data_size = sizeof(SmackerContext),
403 .read_probe = smacker_probe,
404 .read_header = smacker_read_header,
405 .read_packet = smacker_read_packet,
406 .read_close = smacker_read_close,