3 * Copyright (c) 2007 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
25 #define DXA_EXTRA_SIZE 9
32 int64_t wavpos, vidpos;
36 static int dxa_probe(AVProbeData *p)
38 /* check file header */
39 if (p->buf[0] == 'D' && p->buf[1] == 'E' &&
40 p->buf[2] == 'X' && p->buf[3] == 'A')
41 return AVPROBE_SCORE_MAX;
46 static int dxa_read_header(AVFormatContext *s, AVFormatParameters *ap)
48 ByteIOContext *pb = s->pb;
49 DXAContext *c = s->priv_data;
58 if (tag != MKTAG('D', 'E', 'X', 'A'))
61 c->frames = get_be16(pb);
63 av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
82 st = av_new_stream(s, 0);
86 // Parse WAV data header
87 if(get_le32(pb) == MKTAG('W', 'A', 'V', 'E')){
91 c->vidpos = url_ftell(pb) + size;
95 ast = av_new_stream(s, 0);
98 get_wav_header(pb, ast->codec, fsize);
100 while(url_ftell(pb) < c->vidpos && !url_feof(pb)){
102 fsize = get_le32(pb);
103 if(tag == MKTAG('d', 'a', 't', 'a')) break;
104 url_fskip(pb, fsize);
106 c->bpc = (fsize + c->frames - 1) / c->frames;
107 if(ast->codec->block_align)
108 c->bpc = ((c->bpc + ast->codec->block_align - 1) / ast->codec->block_align) * ast->codec->block_align;
109 c->bytes_left = fsize;
110 c->wavpos = url_ftell(pb);
111 url_fseek(pb, c->vidpos, SEEK_SET);
114 /* now we are ready: build format streams */
115 st->codec->codec_type = CODEC_TYPE_VIDEO;
116 st->codec->codec_id = CODEC_ID_DXA;
117 st->codec->width = w;
118 st->codec->height = h;
119 av_reduce(&den, &num, den, num, (1UL<<31)-1);
120 av_set_pts_info(st, 33, num, den);
121 /* flags & 0x80 means that image is interlaced,
122 * flags & 0x40 means that image has double height
123 * either way set true height
126 st->codec->height >>= 1;
128 c->readvid = !c->has_sound;
129 c->vidpos = url_ftell(pb);
131 s->duration = (int64_t)c->frames * AV_TIME_BASE * num / den;
132 av_log(s, AV_LOG_DEBUG, "%d frame(s)\n",c->frames);
137 static int dxa_read_packet(AVFormatContext *s, AVPacket *pkt)
139 DXAContext *c = s->priv_data;
142 uint8_t buf[DXA_EXTRA_SIZE], pal[768+4];
145 if(!c->readvid && c->has_sound && c->bytes_left){
147 url_fseek(s->pb, c->wavpos, SEEK_SET);
148 size = FFMIN(c->bytes_left, c->bpc);
149 ret = av_get_packet(s->pb, pkt, size);
150 pkt->stream_index = 1;
153 c->bytes_left -= size;
154 c->wavpos = url_ftell(s->pb);
157 url_fseek(s->pb, c->vidpos, SEEK_SET);
158 while(!url_feof(s->pb) && c->frames){
159 get_buffer(s->pb, buf, 4);
160 switch(AV_RL32(buf)){
161 case MKTAG('N', 'U', 'L', 'L'):
162 if(av_new_packet(pkt, 4 + pal_size) < 0)
163 return AVERROR(ENOMEM);
164 pkt->stream_index = 0;
165 if(pal_size) memcpy(pkt->data, pal, pal_size);
166 memcpy(pkt->data + pal_size, buf, 4);
168 c->vidpos = url_ftell(s->pb);
171 case MKTAG('C', 'M', 'A', 'P'):
174 get_buffer(s->pb, pal + 4, 768);
176 case MKTAG('F', 'R', 'A', 'M'):
177 get_buffer(s->pb, buf + 4, DXA_EXTRA_SIZE - 4);
178 size = AV_RB32(buf + 5);
180 av_log(s, AV_LOG_ERROR, "Frame size is too big: %d\n", size);
183 if(av_new_packet(pkt, size + DXA_EXTRA_SIZE + pal_size) < 0)
184 return AVERROR(ENOMEM);
185 memcpy(pkt->data + pal_size, buf, DXA_EXTRA_SIZE);
186 ret = get_buffer(s->pb, pkt->data + DXA_EXTRA_SIZE + pal_size, size);
191 if(pal_size) memcpy(pkt->data, pal, pal_size);
192 pkt->stream_index = 0;
194 c->vidpos = url_ftell(s->pb);
198 av_log(s, AV_LOG_ERROR, "Unknown tag %c%c%c%c\n", buf[0], buf[1], buf[2], buf[3]);
205 AVInputFormat dxa_demuxer = {