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/channel_layout.h"
29 #include "libavutil/intreadwrite.h"
31 #include "avio_internal.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 {
50 /* internal variables */
52 /* current frame for demuxing */
64 /* palette used in Smacker */
65 static const uint8_t smk_pal[64] = {
66 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
67 0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
68 0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
69 0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
70 0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
71 0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
72 0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
73 0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
77 static int smacker_probe(const AVProbeData *p)
79 if ( AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '2')
80 && AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '4'))
83 if (AV_RL32(p->buf+4) > 32768U || AV_RL32(p->buf+8) > 32768U)
84 return AVPROBE_SCORE_MAX/4;
86 return AVPROBE_SCORE_MAX;
89 static int smacker_read_header(AVFormatContext *s)
91 AVIOContext *pb = s->pb;
92 SmackerContext *smk = s->priv_data;
94 uint32_t magic, width, height, flags, treesize;
98 /* read and check header */
99 magic = avio_rl32(pb);
100 if (magic != MKTAG('S', 'M', 'K', '2') && magic != MKTAG('S', 'M', 'K', '4'))
101 return AVERROR_INVALIDDATA;
102 width = avio_rl32(pb);
103 height = avio_rl32(pb);
104 smk->frames = avio_rl32(pb);
105 pts_inc = avio_rl32(pb);
106 if (pts_inc > INT_MAX / 100) {
107 av_log(s, AV_LOG_ERROR, "pts_inc %d is too large\n", pts_inc);
108 return AVERROR_INVALIDDATA;
111 flags = avio_rl32(pb);
112 if (flags & SMACKER_FLAG_RING_FRAME)
114 if (smk->frames > 0xFFFFFF) {
115 av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n", smk->frames);
116 return AVERROR_INVALIDDATA;
119 avio_skip(pb, 28); /* Unused audio related data */
121 treesize = avio_rl32(pb);
122 if (treesize >= UINT_MAX/4) {
123 // treesize + 16 must not overflow (this check is probably redundant)
124 av_log(s, AV_LOG_ERROR, "treesize too large\n");
125 return AVERROR_INVALIDDATA;
128 st = avformat_new_stream(s, NULL);
130 return AVERROR(ENOMEM);
132 /* Smacker uses 100000 as internal timebase */
138 av_reduce(&tbase, &pts_inc, tbase, pts_inc, (1UL << 31) - 1);
139 avpriv_set_pts_info(st, 33, pts_inc, tbase);
141 /* init video codec */
142 st->codecpar->width = width;
143 st->codecpar->height = height;
144 st->codecpar->codec_tag = magic;
146 if ((ret = ff_alloc_extradata(st->codecpar, treesize + 16)) < 0) {
147 av_log(s, AV_LOG_ERROR,
148 "Cannot allocate %"PRIu32" bytes of extradata\n",
152 if ((ret = ffio_read_size(pb, st->codecpar->extradata, 16)) < 0)
155 /* handle possible audio streams */
156 for(i = 0; i < 7; i++) {
157 uint32_t rate = avio_rl24(pb);
158 uint8_t aflag = avio_r8(pb);
160 smk->indexes[i] = -1;
163 AVStream *ast = avformat_new_stream(s, NULL);
165 return AVERROR(ENOMEM);
167 smk->indexes[i] = ast->index;
168 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
169 if (aflag & SMK_AUD_BINKAUD) {
170 ast->codecpar->codec_id = AV_CODEC_ID_BINKAUDIO_RDFT;
171 } else if (aflag & SMK_AUD_USEDCT) {
172 ast->codecpar->codec_id = AV_CODEC_ID_BINKAUDIO_DCT;
173 } else if (aflag & SMK_AUD_PACKED) {
174 ast->codecpar->codec_id = AV_CODEC_ID_SMACKAUDIO;
175 ast->codecpar->codec_tag = MKTAG('S', 'M', 'K', 'A');
177 ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
179 if (aflag & SMK_AUD_STEREO) {
180 ast->codecpar->channels = 2;
181 ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
183 ast->codecpar->channels = 1;
184 ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
186 ast->codecpar->sample_rate = rate;
187 ast->codecpar->bits_per_coded_sample = (aflag & SMK_AUD_16BITS) ? 16 : 8;
188 if (ast->codecpar->bits_per_coded_sample == 16 &&
189 ast->codecpar->codec_id == AV_CODEC_ID_PCM_U8)
190 ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
191 avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate
192 * ast->codecpar->channels * ast->codecpar->bits_per_coded_sample / 8);
195 avio_rl32(pb); /* padding */
197 smk->frm_size = av_malloc_array(smk->frames, sizeof(*smk->frm_size));
198 smk->frm_flags = av_malloc(smk->frames);
199 if (!smk->frm_size || !smk->frm_flags) {
200 av_freep(&smk->frm_size);
201 av_freep(&smk->frm_flags);
202 return AVERROR(ENOMEM);
205 /* read frame info */
206 for(i = 0; i < smk->frames; i++) {
207 smk->frm_size[i] = avio_rl32(pb);
209 for(i = 0; i < smk->frames; i++) {
210 smk->frm_flags[i] = avio_r8(pb);
213 smk->videoindex = st->index;
214 st->codecpar->format = AV_PIX_FMT_PAL8;
215 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
216 st->codecpar->codec_id = AV_CODEC_ID_SMACKVIDEO;
217 st->duration = smk->frames;
219 /* load trees to extradata, they will be unpacked by decoder */
220 ret = avio_read(pb, st->codecpar->extradata + 16, st->codecpar->extradata_size - 16);
221 if(ret != st->codecpar->extradata_size - 16){
222 av_freep(&smk->frm_size);
223 av_freep(&smk->frm_flags);
228 smk->nextpos = avio_tell(pb);
234 static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
236 SmackerContext *smk = s->priv_data;
243 if (avio_feof(s->pb) || smk->cur_frame >= smk->frames)
246 /* if we demuxed all streams, pass another frame */
247 if(smk->curstream < 0) {
248 avio_seek(s->pb, smk->nextpos, 0);
249 frame_size = smk->frm_size[smk->cur_frame] & (~3);
250 flags = smk->frm_flags[smk->cur_frame];
251 /* handle palette change event */
252 if(flags & SMACKER_PAL){
253 int size, sz, t, off, j, pos;
254 uint8_t *pal = smk->pal;
257 memcpy(oldpal, pal, 768);
258 size = avio_r8(s->pb);
260 if(size + 1 > frame_size)
261 return AVERROR_INVALIDDATA;
265 pos = avio_tell(s->pb) + size;
268 if(t & 0x80){ /* skip palette entries */
269 sz += (t & 0x7F) + 1;
270 pal += ((t & 0x7F) + 1) * 3;
271 } else if(t & 0x40){ /* copy with offset */
272 off = avio_r8(s->pb);
274 if (off + j > 0x100) {
275 av_log(s, AV_LOG_ERROR,
276 "Invalid palette update, offset=%d length=%d extends beyond palette size\n",
278 return AVERROR_INVALIDDATA;
281 while(j-- && sz < 256) {
282 *pal++ = oldpal[off + 0];
283 *pal++ = oldpal[off + 1];
284 *pal++ = oldpal[off + 2];
288 } else { /* new entries */
290 *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
291 *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
295 avio_seek(s->pb, pos, 0);
300 /* if audio chunks are present, put them to stack and retrieve later */
301 for(i = 0; i < 7; i++) {
306 size = avio_rl32(s->pb) - 4;
307 if (!size || size + 4LL > frame_size) {
308 av_log(s, AV_LOG_ERROR, "Invalid audio part size\n");
309 return AVERROR_INVALIDDATA;
314 if ((err = av_reallocp(&smk->bufs[smk->curstream], size)) < 0) {
315 smk->buf_sizes[smk->curstream] = 0;
318 smk->buf_sizes[smk->curstream] = size;
319 ret = avio_read(s->pb, smk->bufs[smk->curstream], size);
322 smk->stream_id[smk->curstream] = smk->indexes[i];
326 if (frame_size < 0 || frame_size >= INT_MAX/2)
327 return AVERROR_INVALIDDATA;
328 if ((ret = av_new_packet(pkt, frame_size + 769)) < 0)
330 if(smk->frm_size[smk->cur_frame] & 1)
332 pkt->data[0] = palchange;
333 memcpy(pkt->data + 1, smk->pal, 768);
334 ret = avio_read(s->pb, pkt->data + 769, frame_size);
335 if(ret != frame_size)
337 pkt->stream_index = smk->videoindex;
338 pkt->pts = smk->cur_frame;
339 pkt->size = ret + 769;
341 smk->nextpos = avio_tell(s->pb);
343 if (smk->stream_id[smk->curstream] < 0 || !smk->bufs[smk->curstream])
344 return AVERROR_INVALIDDATA;
345 if ((ret = av_new_packet(pkt, smk->buf_sizes[smk->curstream])) < 0)
347 memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);
348 pkt->size = smk->buf_sizes[smk->curstream];
349 pkt->stream_index = smk->stream_id[smk->curstream];
350 pkt->pts = smk->aud_pts[smk->curstream];
351 smk->aud_pts[smk->curstream] += AV_RL32(pkt->data);
358 static int smacker_read_close(AVFormatContext *s)
360 SmackerContext *smk = s->priv_data;
363 for(i = 0; i < 7; i++)
364 av_freep(&smk->bufs[i]);
365 av_freep(&smk->frm_size);
366 av_freep(&smk->frm_flags);
371 AVInputFormat ff_smacker_demuxer = {
373 .long_name = NULL_IF_CONFIG_SMALL("Smacker"),
374 .priv_data_size = sizeof(SmackerContext),
375 .read_probe = smacker_probe,
376 .read_header = smacker_read_header,
377 .read_packet = smacker_read_packet,
378 .read_close = smacker_read_close,