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(p->buf[0] == 'S' && p->buf[1] == 'M' && p->buf[2] == 'K'
96 && (p->buf[3] == '2' || p->buf[3] == '4'))
97 return AVPROBE_SCORE_MAX;
102 static int smacker_read_header(AVFormatContext *s)
104 AVIOContext *pb = s->pb;
105 SmackerContext *smk = s->priv_data;
106 AVStream *st, *ast[7];
110 /* read and check header */
111 smk->magic = avio_rl32(pb);
112 if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4'))
113 return AVERROR_INVALIDDATA;
114 smk->width = avio_rl32(pb);
115 smk->height = avio_rl32(pb);
116 smk->frames = avio_rl32(pb);
117 smk->pts_inc = (int32_t)avio_rl32(pb);
118 smk->flags = avio_rl32(pb);
119 if(smk->flags & SMACKER_FLAG_RING_FRAME)
121 for(i = 0; i < 7; i++)
122 smk->audio[i] = avio_rl32(pb);
123 smk->treesize = avio_rl32(pb);
125 if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant)
126 av_log(s, AV_LOG_ERROR, "treesize too large\n");
127 return AVERROR_INVALIDDATA;
130 //FIXME remove extradata "rebuilding"
131 smk->mmap_size = avio_rl32(pb);
132 smk->mclr_size = avio_rl32(pb);
133 smk->full_size = avio_rl32(pb);
134 smk->type_size = avio_rl32(pb);
135 for(i = 0; i < 7; i++) {
136 smk->rates[i] = avio_rl24(pb);
137 smk->aflags[i] = avio_r8(pb);
139 smk->pad = avio_rl32(pb);
141 if(smk->frames > 0xFFFFFF) {
142 av_log(s, AV_LOG_ERROR, "Too many frames: %i\n", smk->frames);
143 return AVERROR_INVALIDDATA;
145 smk->frm_size = av_malloc(smk->frames * 4);
146 smk->frm_flags = av_malloc(smk->frames);
148 smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));
150 /* read frame info */
151 for(i = 0; i < smk->frames; i++) {
152 smk->frm_size[i] = avio_rl32(pb);
154 for(i = 0; i < smk->frames; i++) {
155 smk->frm_flags[i] = avio_r8(pb);
158 /* init video codec */
159 st = avformat_new_stream(s, NULL);
161 return AVERROR(ENOMEM);
162 smk->videoindex = st->index;
163 st->codec->width = smk->width;
164 st->codec->height = smk->height;
165 st->codec->pix_fmt = AV_PIX_FMT_PAL8;
166 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
167 st->codec->codec_id = AV_CODEC_ID_SMACKVIDEO;
168 st->codec->codec_tag = smk->magic;
169 /* Smacker uses 100000 as internal timebase */
171 smk->pts_inc = -smk->pts_inc;
175 av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);
176 avpriv_set_pts_info(st, 33, smk->pts_inc, tbase);
177 st->duration = smk->frames;
178 /* handle possible audio streams */
179 for(i = 0; i < 7; i++) {
180 smk->indexes[i] = -1;
182 ast[i] = avformat_new_stream(s, NULL);
183 smk->indexes[i] = ast[i]->index;
184 ast[i]->codec->codec_type = AVMEDIA_TYPE_AUDIO;
185 if (smk->aflags[i] & SMK_AUD_BINKAUD) {
186 ast[i]->codec->codec_id = AV_CODEC_ID_BINKAUDIO_RDFT;
187 } else if (smk->aflags[i] & SMK_AUD_USEDCT) {
188 ast[i]->codec->codec_id = AV_CODEC_ID_BINKAUDIO_DCT;
189 } else if (smk->aflags[i] & SMK_AUD_PACKED){
190 ast[i]->codec->codec_id = AV_CODEC_ID_SMACKAUDIO;
191 ast[i]->codec->codec_tag = MKTAG('S', 'M', 'K', 'A');
193 ast[i]->codec->codec_id = AV_CODEC_ID_PCM_U8;
195 if (smk->aflags[i] & SMK_AUD_STEREO) {
196 ast[i]->codec->channels = 2;
197 ast[i]->codec->channel_layout = AV_CH_LAYOUT_STEREO;
199 ast[i]->codec->channels = 1;
200 ast[i]->codec->channel_layout = AV_CH_LAYOUT_MONO;
202 ast[i]->codec->sample_rate = smk->rates[i];
203 ast[i]->codec->bits_per_coded_sample = (smk->aflags[i] & SMK_AUD_16BITS) ? 16 : 8;
204 if(ast[i]->codec->bits_per_coded_sample == 16 && ast[i]->codec->codec_id == AV_CODEC_ID_PCM_U8)
205 ast[i]->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
206 avpriv_set_pts_info(ast[i], 64, 1, ast[i]->codec->sample_rate
207 * ast[i]->codec->channels * ast[i]->codec->bits_per_coded_sample / 8);
212 /* load trees to extradata, they will be unpacked by decoder */
213 st->codec->extradata = av_malloc(smk->treesize + 16 + FF_INPUT_BUFFER_PADDING_SIZE);
214 st->codec->extradata_size = smk->treesize + 16;
215 if(!st->codec->extradata){
216 av_log(s, AV_LOG_ERROR, "Cannot allocate %i bytes of extradata\n", smk->treesize + 16);
217 av_free(smk->frm_size);
218 av_free(smk->frm_flags);
219 return AVERROR(ENOMEM);
221 ret = avio_read(pb, st->codec->extradata + 16, st->codec->extradata_size - 16);
222 if(ret != st->codec->extradata_size - 16){
223 av_free(smk->frm_size);
224 av_free(smk->frm_flags);
227 ((int32_t*)st->codec->extradata)[0] = av_le2ne32(smk->mmap_size);
228 ((int32_t*)st->codec->extradata)[1] = av_le2ne32(smk->mclr_size);
229 ((int32_t*)st->codec->extradata)[2] = av_le2ne32(smk->full_size);
230 ((int32_t*)st->codec->extradata)[3] = av_le2ne32(smk->type_size);
233 smk->nextpos = avio_tell(pb);
239 static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
241 SmackerContext *smk = s->priv_data;
248 if (url_feof(s->pb) || smk->cur_frame >= smk->frames)
251 /* if we demuxed all streams, pass another frame */
252 if(smk->curstream < 0) {
253 avio_seek(s->pb, smk->nextpos, 0);
254 frame_size = smk->frm_size[smk->cur_frame] & (~3);
255 flags = smk->frm_flags[smk->cur_frame];
256 /* handle palette change event */
257 if(flags & SMACKER_PAL){
258 int size, sz, t, off, j, pos;
259 uint8_t *pal = smk->pal;
262 memcpy(oldpal, pal, 768);
263 size = avio_r8(s->pb);
265 if(size + 1 > frame_size)
266 return AVERROR_INVALIDDATA;
270 pos = avio_tell(s->pb) + size;
273 if(t & 0x80){ /* skip palette entries */
274 sz += (t & 0x7F) + 1;
275 pal += ((t & 0x7F) + 1) * 3;
276 } else if(t & 0x40){ /* copy with offset */
277 off = avio_r8(s->pb);
279 if (off + j - 1 > 0xff) {
280 av_log(s, AV_LOG_ERROR,
281 "Invalid palette update, offset=%d length=%d extends beyond palette size\n",
283 return AVERROR_INVALIDDATA;
286 while(j-- && sz < 256) {
287 *pal++ = oldpal[off + 0];
288 *pal++ = oldpal[off + 1];
289 *pal++ = oldpal[off + 2];
293 } else { /* new entries */
295 *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
296 *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
300 avio_seek(s->pb, pos, 0);
305 /* if audio chunks are present, put them to stack and retrieve later */
306 for(i = 0; i < 7; i++) {
311 size = avio_rl32(s->pb) - 4;
312 if(size + 4L > frame_size)
313 return AVERROR_INVALIDDATA;
317 tmpbuf = av_realloc(smk->bufs[smk->curstream], size);
319 return AVERROR(ENOMEM);
320 smk->bufs[smk->curstream] = tmpbuf;
321 smk->buf_sizes[smk->curstream] = size;
322 ret = avio_read(s->pb, smk->bufs[smk->curstream], size);
325 smk->stream_id[smk->curstream] = smk->indexes[i];
330 return AVERROR_INVALIDDATA;
331 if (av_new_packet(pkt, frame_size + 769))
332 return AVERROR(ENOMEM);
333 if(smk->frm_size[smk->cur_frame] & 1)
335 pkt->data[0] = palchange;
336 memcpy(pkt->data + 1, smk->pal, 768);
337 ret = avio_read(s->pb, pkt->data + 769, frame_size);
338 if(ret != frame_size)
340 pkt->stream_index = smk->videoindex;
341 pkt->size = ret + 769;
343 smk->nextpos = avio_tell(s->pb);
345 if (av_new_packet(pkt, smk->buf_sizes[smk->curstream]))
346 return AVERROR(ENOMEM);
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_free(smk->bufs[i]);
365 av_free(smk->frm_size);
366 av_free(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,