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/channel_layout.h"
28 #include "libavutil/intreadwrite.h"
32 #define SMACKER_PAL 0x01
33 #define SMACKER_FLAG_RING_FRAME 0x01
36 SMK_AUD_PACKED = 0x80,
37 SMK_AUD_16BITS = 0x20,
38 SMK_AUD_STEREO = 0x10,
39 SMK_AUD_BINKAUD = 0x08,
43 typedef struct SmackerContext {
44 /* Smacker file header */
46 uint32_t width, height;
52 uint32_t mmap_size, mclr_size, full_size, type_size;
59 /* internal variables */
63 /* current frame for demuxing */
75 typedef struct SmackerFrame {
80 /* palette used in Smacker */
81 static const uint8_t smk_pal[64] = {
82 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
83 0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
84 0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
85 0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
86 0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
87 0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
88 0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
89 0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
93 static int smacker_probe(AVProbeData *p)
95 if ( AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '2')
96 && AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '4'))
99 if (AV_RL32(p->buf+4) > 32768U || AV_RL32(p->buf+8) > 32768U)
100 return AVPROBE_SCORE_MAX/4;
102 return AVPROBE_SCORE_MAX;
105 static int smacker_read_header(AVFormatContext *s)
107 AVIOContext *pb = s->pb;
108 SmackerContext *smk = s->priv_data;
109 AVStream *st, *ast[7];
113 /* read and check header */
114 smk->magic = avio_rl32(pb);
115 if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4'))
116 return AVERROR_INVALIDDATA;
117 smk->width = avio_rl32(pb);
118 smk->height = avio_rl32(pb);
119 smk->frames = avio_rl32(pb);
120 smk->pts_inc = (int32_t)avio_rl32(pb);
121 smk->flags = avio_rl32(pb);
122 if(smk->flags & SMACKER_FLAG_RING_FRAME)
124 for(i = 0; i < 7; i++)
125 smk->audio[i] = avio_rl32(pb);
126 smk->treesize = avio_rl32(pb);
128 if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant)
129 av_log(s, AV_LOG_ERROR, "treesize too large\n");
130 return AVERROR_INVALIDDATA;
133 //FIXME remove extradata "rebuilding"
134 smk->mmap_size = avio_rl32(pb);
135 smk->mclr_size = avio_rl32(pb);
136 smk->full_size = avio_rl32(pb);
137 smk->type_size = avio_rl32(pb);
138 for(i = 0; i < 7; i++) {
139 smk->rates[i] = avio_rl24(pb);
140 smk->aflags[i] = avio_r8(pb);
142 smk->pad = avio_rl32(pb);
144 if(smk->frames > 0xFFFFFF) {
145 av_log(s, AV_LOG_ERROR, "Too many frames: %i\n", smk->frames);
146 return AVERROR_INVALIDDATA;
148 smk->frm_size = av_malloc_array(smk->frames, sizeof(*smk->frm_size));
149 smk->frm_flags = av_malloc(smk->frames);
150 if (!smk->frm_size || !smk->frm_flags) {
151 av_freep(&smk->frm_size);
152 av_freep(&smk->frm_flags);
153 return AVERROR(ENOMEM);
156 smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));
158 /* read frame info */
159 for(i = 0; i < smk->frames; i++) {
160 smk->frm_size[i] = avio_rl32(pb);
162 for(i = 0; i < smk->frames; i++) {
163 smk->frm_flags[i] = avio_r8(pb);
166 /* init video codec */
167 st = avformat_new_stream(s, NULL);
169 return AVERROR(ENOMEM);
170 smk->videoindex = st->index;
171 st->codec->width = smk->width;
172 st->codec->height = smk->height;
173 st->codec->pix_fmt = AV_PIX_FMT_PAL8;
174 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
175 st->codec->codec_id = AV_CODEC_ID_SMACKVIDEO;
176 st->codec->codec_tag = smk->magic;
177 /* Smacker uses 100000 as internal timebase */
179 smk->pts_inc = -smk->pts_inc;
183 av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);
184 avpriv_set_pts_info(st, 33, smk->pts_inc, tbase);
185 st->duration = smk->frames;
186 /* handle possible audio streams */
187 for(i = 0; i < 7; i++) {
188 smk->indexes[i] = -1;
190 ast[i] = avformat_new_stream(s, NULL);
192 return AVERROR(ENOMEM);
193 smk->indexes[i] = ast[i]->index;
194 ast[i]->codec->codec_type = AVMEDIA_TYPE_AUDIO;
195 if (smk->aflags[i] & SMK_AUD_BINKAUD) {
196 ast[i]->codec->codec_id = AV_CODEC_ID_BINKAUDIO_RDFT;
197 } else if (smk->aflags[i] & SMK_AUD_USEDCT) {
198 ast[i]->codec->codec_id = AV_CODEC_ID_BINKAUDIO_DCT;
199 } else if (smk->aflags[i] & SMK_AUD_PACKED){
200 ast[i]->codec->codec_id = AV_CODEC_ID_SMACKAUDIO;
201 ast[i]->codec->codec_tag = MKTAG('S', 'M', 'K', 'A');
203 ast[i]->codec->codec_id = AV_CODEC_ID_PCM_U8;
205 if (smk->aflags[i] & SMK_AUD_STEREO) {
206 ast[i]->codec->channels = 2;
207 ast[i]->codec->channel_layout = AV_CH_LAYOUT_STEREO;
209 ast[i]->codec->channels = 1;
210 ast[i]->codec->channel_layout = AV_CH_LAYOUT_MONO;
212 ast[i]->codec->sample_rate = smk->rates[i];
213 ast[i]->codec->bits_per_coded_sample = (smk->aflags[i] & SMK_AUD_16BITS) ? 16 : 8;
214 if(ast[i]->codec->bits_per_coded_sample == 16 && ast[i]->codec->codec_id == AV_CODEC_ID_PCM_U8)
215 ast[i]->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
216 avpriv_set_pts_info(ast[i], 64, 1, ast[i]->codec->sample_rate
217 * ast[i]->codec->channels * ast[i]->codec->bits_per_coded_sample / 8);
222 /* load trees to extradata, they will be unpacked by decoder */
223 if(ff_alloc_extradata(st->codec, smk->treesize + 16)){
224 av_log(s, AV_LOG_ERROR, "Cannot allocate %i bytes of extradata\n", smk->treesize + 16);
225 av_freep(&smk->frm_size);
226 av_freep(&smk->frm_flags);
227 return AVERROR(ENOMEM);
229 ret = avio_read(pb, st->codec->extradata + 16, st->codec->extradata_size - 16);
230 if(ret != st->codec->extradata_size - 16){
231 av_freep(&smk->frm_size);
232 av_freep(&smk->frm_flags);
235 ((int32_t*)st->codec->extradata)[0] = av_le2ne32(smk->mmap_size);
236 ((int32_t*)st->codec->extradata)[1] = av_le2ne32(smk->mclr_size);
237 ((int32_t*)st->codec->extradata)[2] = av_le2ne32(smk->full_size);
238 ((int32_t*)st->codec->extradata)[3] = av_le2ne32(smk->type_size);
241 smk->nextpos = avio_tell(pb);
247 static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
249 SmackerContext *smk = s->priv_data;
256 if (url_feof(s->pb) || smk->cur_frame >= smk->frames)
259 /* if we demuxed all streams, pass another frame */
260 if(smk->curstream < 0) {
261 avio_seek(s->pb, smk->nextpos, 0);
262 frame_size = smk->frm_size[smk->cur_frame] & (~3);
263 flags = smk->frm_flags[smk->cur_frame];
264 /* handle palette change event */
265 if(flags & SMACKER_PAL){
266 int size, sz, t, off, j, pos;
267 uint8_t *pal = smk->pal;
270 memcpy(oldpal, pal, 768);
271 size = avio_r8(s->pb);
273 if(size + 1 > frame_size)
274 return AVERROR_INVALIDDATA;
278 pos = avio_tell(s->pb) + size;
281 if(t & 0x80){ /* skip palette entries */
282 sz += (t & 0x7F) + 1;
283 pal += ((t & 0x7F) + 1) * 3;
284 } else if(t & 0x40){ /* copy with offset */
285 off = avio_r8(s->pb);
287 if (off + j > 0x100) {
288 av_log(s, AV_LOG_ERROR,
289 "Invalid palette update, offset=%d length=%d extends beyond palette size\n",
291 return AVERROR_INVALIDDATA;
294 while(j-- && sz < 256) {
295 *pal++ = oldpal[off + 0];
296 *pal++ = oldpal[off + 1];
297 *pal++ = oldpal[off + 2];
301 } else { /* new entries */
303 *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
304 *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
308 avio_seek(s->pb, pos, 0);
313 /* if audio chunks are present, put them to stack and retrieve later */
314 for(i = 0; i < 7; i++) {
319 size = avio_rl32(s->pb) - 4;
320 if (!size || size + 4L > frame_size) {
321 av_log(s, AV_LOG_ERROR, "Invalid audio part size\n");
322 return AVERROR_INVALIDDATA;
327 if ((err = av_reallocp(&smk->bufs[smk->curstream], size)) < 0) {
328 smk->buf_sizes[smk->curstream] = 0;
331 smk->buf_sizes[smk->curstream] = size;
332 ret = avio_read(s->pb, smk->bufs[smk->curstream], size);
335 smk->stream_id[smk->curstream] = smk->indexes[i];
339 if (frame_size < 0 || frame_size >= INT_MAX/2)
340 return AVERROR_INVALIDDATA;
341 if (av_new_packet(pkt, frame_size + 769))
342 return AVERROR(ENOMEM);
343 if(smk->frm_size[smk->cur_frame] & 1)
345 pkt->data[0] = palchange;
346 memcpy(pkt->data + 1, smk->pal, 768);
347 ret = avio_read(s->pb, pkt->data + 769, frame_size);
348 if(ret != frame_size)
350 pkt->stream_index = smk->videoindex;
351 pkt->pts = smk->cur_frame;
352 pkt->size = ret + 769;
354 smk->nextpos = avio_tell(s->pb);
356 if (smk->stream_id[smk->curstream] < 0 || !smk->bufs[smk->curstream])
357 return AVERROR_INVALIDDATA;
358 if (av_new_packet(pkt, smk->buf_sizes[smk->curstream]))
359 return AVERROR(ENOMEM);
360 memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);
361 pkt->size = smk->buf_sizes[smk->curstream];
362 pkt->stream_index = smk->stream_id[smk->curstream];
363 pkt->pts = smk->aud_pts[smk->curstream];
364 smk->aud_pts[smk->curstream] += AV_RL32(pkt->data);
371 static int smacker_read_close(AVFormatContext *s)
373 SmackerContext *smk = s->priv_data;
376 for(i = 0; i < 7; i++)
377 av_freep(&smk->bufs[i]);
378 av_freep(&smk->frm_size);
379 av_freep(&smk->frm_flags);
384 AVInputFormat ff_smacker_demuxer = {
386 .long_name = NULL_IF_CONFIG_SMALL("Smacker"),
387 .priv_data_size = sizeof(SmackerContext),
388 .read_probe = smacker_probe,
389 .read_header = smacker_read_header,
390 .read_packet = smacker_read_packet,
391 .read_close = smacker_read_close,