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"
30 #define SMACKER_PAL 0x01
31 #define SMACKER_FLAG_RING_FRAME 0x01
34 SMK_AUD_PACKED = 0x80000000,
35 SMK_AUD_16BITS = 0x20000000,
36 SMK_AUD_STEREO = 0x10000000,
37 SMK_AUD_BINKAUD = 0x08000000,
38 SMK_AUD_USEDCT = 0x04000000
41 typedef struct SmackerContext {
42 /* Smacker file header */
44 uint32_t width, height;
50 uint32_t mmap_size, mclr_size, full_size, type_size;
56 /* internal variables */
60 /* current frame for demuxing */
72 typedef struct SmackerFrame {
77 /* palette used in Smacker */
78 static const uint8_t smk_pal[64] = {
79 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
80 0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
81 0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
82 0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
83 0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
84 0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
85 0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
86 0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
90 static int smacker_probe(AVProbeData *p)
92 if(p->buf[0] == 'S' && p->buf[1] == 'M' && p->buf[2] == 'K'
93 && (p->buf[3] == '2' || p->buf[3] == '4'))
94 return AVPROBE_SCORE_MAX;
99 static int smacker_read_header(AVFormatContext *s, AVFormatParameters *ap)
101 ByteIOContext *pb = s->pb;
102 SmackerContext *smk = s->priv_data;
103 AVStream *st, *ast[7];
107 /* read and check header */
108 smk->magic = get_le32(pb);
109 if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4'))
111 smk->width = get_le32(pb);
112 smk->height = get_le32(pb);
113 smk->frames = get_le32(pb);
114 smk->pts_inc = (int32_t)get_le32(pb);
115 smk->flags = get_le32(pb);
116 if(smk->flags & SMACKER_FLAG_RING_FRAME)
118 for(i = 0; i < 7; i++)
119 smk->audio[i] = get_le32(pb);
120 smk->treesize = get_le32(pb);
122 if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant)
123 av_log(s, AV_LOG_ERROR, "treesize too large\n");
127 //FIXME remove extradata "rebuilding"
128 smk->mmap_size = get_le32(pb);
129 smk->mclr_size = get_le32(pb);
130 smk->full_size = get_le32(pb);
131 smk->type_size = get_le32(pb);
132 for(i = 0; i < 7; i++)
133 smk->rates[i] = get_le32(pb);
134 smk->pad = get_le32(pb);
136 if(smk->frames > 0xFFFFFF) {
137 av_log(s, AV_LOG_ERROR, "Too many frames: %i\n", smk->frames);
140 smk->frm_size = av_malloc(smk->frames * 4);
141 smk->frm_flags = av_malloc(smk->frames);
143 smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));
145 /* read frame info */
146 for(i = 0; i < smk->frames; i++) {
147 smk->frm_size[i] = get_le32(pb);
149 for(i = 0; i < smk->frames; i++) {
150 smk->frm_flags[i] = get_byte(pb);
153 /* init video codec */
154 st = av_new_stream(s, 0);
157 smk->videoindex = st->index;
158 st->codec->width = smk->width;
159 st->codec->height = smk->height;
160 st->codec->pix_fmt = PIX_FMT_PAL8;
161 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
162 st->codec->codec_id = CODEC_ID_SMACKVIDEO;
163 st->codec->codec_tag = smk->magic;
164 /* Smacker uses 100000 as internal timebase */
166 smk->pts_inc = -smk->pts_inc;
170 av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);
171 av_set_pts_info(st, 33, smk->pts_inc, tbase);
172 st->duration = smk->frames;
173 /* handle possible audio streams */
174 for(i = 0; i < 7; i++) {
175 smk->indexes[i] = -1;
176 if(smk->rates[i] & 0xFFFFFF){
177 ast[i] = av_new_stream(s, 0);
178 smk->indexes[i] = ast[i]->index;
179 ast[i]->codec->codec_type = AVMEDIA_TYPE_AUDIO;
180 if (smk->rates[i] & SMK_AUD_BINKAUD) {
181 ast[i]->codec->codec_id = CODEC_ID_BINKAUDIO_RDFT;
182 } else if (smk->rates[i] & SMK_AUD_USEDCT) {
183 ast[i]->codec->codec_id = CODEC_ID_BINKAUDIO_DCT;
184 } else if (smk->rates[i] & SMK_AUD_PACKED){
185 ast[i]->codec->codec_id = CODEC_ID_SMACKAUDIO;
186 ast[i]->codec->codec_tag = MKTAG('S', 'M', 'K', 'A');
188 ast[i]->codec->codec_id = CODEC_ID_PCM_U8;
190 ast[i]->codec->channels = (smk->rates[i] & SMK_AUD_STEREO) ? 2 : 1;
191 ast[i]->codec->sample_rate = smk->rates[i] & 0xFFFFFF;
192 ast[i]->codec->bits_per_coded_sample = (smk->rates[i] & SMK_AUD_16BITS) ? 16 : 8;
193 if(ast[i]->codec->bits_per_coded_sample == 16 && ast[i]->codec->codec_id == CODEC_ID_PCM_U8)
194 ast[i]->codec->codec_id = CODEC_ID_PCM_S16LE;
195 av_set_pts_info(ast[i], 64, 1, ast[i]->codec->sample_rate
196 * ast[i]->codec->channels * ast[i]->codec->bits_per_coded_sample / 8);
201 /* load trees to extradata, they will be unpacked by decoder */
202 st->codec->extradata = av_malloc(smk->treesize + 16);
203 st->codec->extradata_size = smk->treesize + 16;
204 if(!st->codec->extradata){
205 av_log(s, AV_LOG_ERROR, "Cannot allocate %i bytes of extradata\n", smk->treesize + 16);
206 av_free(smk->frm_size);
207 av_free(smk->frm_flags);
210 ret = get_buffer(pb, st->codec->extradata + 16, st->codec->extradata_size - 16);
211 if(ret != st->codec->extradata_size - 16){
212 av_free(smk->frm_size);
213 av_free(smk->frm_flags);
216 ((int32_t*)st->codec->extradata)[0] = av_le2ne32(smk->mmap_size);
217 ((int32_t*)st->codec->extradata)[1] = av_le2ne32(smk->mclr_size);
218 ((int32_t*)st->codec->extradata)[2] = av_le2ne32(smk->full_size);
219 ((int32_t*)st->codec->extradata)[3] = av_le2ne32(smk->type_size);
222 smk->nextpos = url_ftell(pb);
228 static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
230 SmackerContext *smk = s->priv_data;
238 if (url_feof(s->pb) || smk->cur_frame >= smk->frames)
241 /* if we demuxed all streams, pass another frame */
242 if(smk->curstream < 0) {
243 url_fseek(s->pb, smk->nextpos, 0);
244 frame_size = smk->frm_size[smk->cur_frame] & (~3);
245 flags = smk->frm_flags[smk->cur_frame];
246 /* handle palette change event */
247 pos = url_ftell(s->pb);
248 if(flags & SMACKER_PAL){
249 int size, sz, t, off, j, pos;
250 uint8_t *pal = smk->pal;
253 memcpy(oldpal, pal, 768);
254 size = get_byte(s->pb);
259 pos = url_ftell(s->pb) + size;
262 if(t & 0x80){ /* skip palette entries */
263 sz += (t & 0x7F) + 1;
264 pal += ((t & 0x7F) + 1) * 3;
265 } else if(t & 0x40){ /* copy with offset */
266 off = get_byte(s->pb) * 3;
268 while(j-- && sz < 256) {
269 *pal++ = oldpal[off + 0];
270 *pal++ = oldpal[off + 1];
271 *pal++ = oldpal[off + 2];
275 } else { /* new entries */
277 *pal++ = smk_pal[get_byte(s->pb) & 0x3F];
278 *pal++ = smk_pal[get_byte(s->pb) & 0x3F];
282 url_fseek(s->pb, pos, 0);
287 /* if audio chunks are present, put them to stack and retrieve later */
288 for(i = 0; i < 7; i++) {
291 size = get_le32(s->pb) - 4;
295 smk->bufs[smk->curstream] = av_realloc(smk->bufs[smk->curstream], size);
296 smk->buf_sizes[smk->curstream] = size;
297 ret = get_buffer(s->pb, smk->bufs[smk->curstream], size);
300 smk->stream_id[smk->curstream] = smk->indexes[i];
304 if (av_new_packet(pkt, frame_size + 768))
305 return AVERROR(ENOMEM);
306 if(smk->frm_size[smk->cur_frame] & 1)
308 pkt->data[0] = palchange;
309 memcpy(pkt->data + 1, smk->pal, 768);
310 ret = get_buffer(s->pb, pkt->data + 769, frame_size);
311 if(ret != frame_size)
313 pkt->stream_index = smk->videoindex;
314 pkt->size = ret + 769;
316 smk->nextpos = url_ftell(s->pb);
318 if (av_new_packet(pkt, smk->buf_sizes[smk->curstream]))
319 return AVERROR(ENOMEM);
320 memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);
321 pkt->size = smk->buf_sizes[smk->curstream];
322 pkt->stream_index = smk->stream_id[smk->curstream];
323 pkt->pts = smk->aud_pts[smk->curstream];
324 smk->aud_pts[smk->curstream] += AV_RL32(pkt->data);
331 static int smacker_read_close(AVFormatContext *s)
333 SmackerContext *smk = s->priv_data;
336 for(i = 0; i < 7; i++)
337 av_free(smk->bufs[i]);
338 av_free(smk->frm_size);
339 av_free(smk->frm_flags);
344 AVInputFormat ff_smacker_demuxer = {
346 NULL_IF_CONFIG_SMALL("Smacker video"),
347 sizeof(SmackerContext),