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00022 #include "avformat.h"
00023 #include "riff.h"
00024
00025 #define DXA_EXTRA_SIZE 9
00026
00027 typedef struct{
00028 int frames;
00029 int has_sound;
00030 int bpc;
00031 uint32_t bytes_left;
00032 int64_t wavpos, vidpos;
00033 int readvid;
00034 }DXAContext;
00035
00036 static int dxa_probe(AVProbeData *p)
00037 {
00038
00039 if (p->buf[0] == 'D' && p->buf[1] == 'E' &&
00040 p->buf[2] == 'X' && p->buf[3] == 'A')
00041 return AVPROBE_SCORE_MAX;
00042 else
00043 return 0;
00044 }
00045
00046 static int dxa_read_header(AVFormatContext *s, AVFormatParameters *ap)
00047 {
00048 ByteIOContext *pb = s->pb;
00049 DXAContext *c = s->priv_data;
00050 AVStream *st, *ast;
00051 uint32_t tag;
00052 int32_t fps;
00053 int w, h;
00054 int num, den;
00055 int flags;
00056
00057 tag = get_le32(pb);
00058 if (tag != MKTAG('D', 'E', 'X', 'A'))
00059 return -1;
00060 flags = get_byte(pb);
00061 c->frames = get_be16(pb);
00062 if(!c->frames){
00063 av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
00064 return -1;
00065 }
00066
00067 fps = get_be32(pb);
00068 if(fps > 0){
00069 den = 1000;
00070 num = fps;
00071 }else if (fps < 0){
00072 den = 100000;
00073 num = -fps;
00074 }else{
00075 den = 10;
00076 num = 1;
00077 }
00078 w = get_be16(pb);
00079 h = get_be16(pb);
00080 c->has_sound = 0;
00081
00082 st = av_new_stream(s, 0);
00083 if (!st)
00084 return -1;
00085
00086
00087 if(get_le32(pb) == MKTAG('W', 'A', 'V', 'E')){
00088 uint32_t size, fsize;
00089 c->has_sound = 1;
00090 size = get_be32(pb);
00091 c->vidpos = url_ftell(pb) + size;
00092 url_fskip(pb, 16);
00093 fsize = get_le32(pb);
00094
00095 ast = av_new_stream(s, 0);
00096 if (!ast)
00097 return -1;
00098 get_wav_header(pb, ast->codec, fsize);
00099
00100 while(url_ftell(pb) < c->vidpos && !url_feof(pb)){
00101 tag = get_le32(pb);
00102 fsize = get_le32(pb);
00103 if(tag == MKTAG('d', 'a', 't', 'a')) break;
00104 url_fskip(pb, fsize);
00105 }
00106 c->bpc = (fsize + c->frames - 1) / c->frames;
00107 if(ast->codec->block_align)
00108 c->bpc = ((c->bpc + ast->codec->block_align - 1) / ast->codec->block_align) * ast->codec->block_align;
00109 c->bytes_left = fsize;
00110 c->wavpos = url_ftell(pb);
00111 url_fseek(pb, c->vidpos, SEEK_SET);
00112 }
00113
00114
00115 st->codec->codec_type = CODEC_TYPE_VIDEO;
00116 st->codec->codec_id = CODEC_ID_DXA;
00117 st->codec->width = w;
00118 st->codec->height = h;
00119 av_reduce(&den, &num, den, num, (1UL<<31)-1);
00120 av_set_pts_info(st, 33, num, den);
00121
00122
00123
00124
00125 if(flags & 0xC0){
00126 st->codec->height >>= 1;
00127 }
00128 c->readvid = !c->has_sound;
00129 c->vidpos = url_ftell(pb);
00130 s->start_time = 0;
00131 s->duration = (int64_t)c->frames * AV_TIME_BASE * num / den;
00132 av_log(s, AV_LOG_DEBUG, "%d frame(s)\n",c->frames);
00133
00134 return 0;
00135 }
00136
00137 static int dxa_read_packet(AVFormatContext *s, AVPacket *pkt)
00138 {
00139 DXAContext *c = s->priv_data;
00140 int ret;
00141 uint32_t size;
00142 uint8_t buf[DXA_EXTRA_SIZE], pal[768+4];
00143 int pal_size = 0;
00144
00145 if(!c->readvid && c->has_sound && c->bytes_left){
00146 c->readvid = 1;
00147 url_fseek(s->pb, c->wavpos, SEEK_SET);
00148 size = FFMIN(c->bytes_left, c->bpc);
00149 ret = av_get_packet(s->pb, pkt, size);
00150 pkt->stream_index = 1;
00151 if(ret != size)
00152 return AVERROR(EIO);
00153 c->bytes_left -= size;
00154 c->wavpos = url_ftell(s->pb);
00155 return 0;
00156 }
00157 url_fseek(s->pb, c->vidpos, SEEK_SET);
00158 while(!url_feof(s->pb) && c->frames){
00159 get_buffer(s->pb, buf, 4);
00160 switch(AV_RL32(buf)){
00161 case MKTAG('N', 'U', 'L', 'L'):
00162 if(av_new_packet(pkt, 4 + pal_size) < 0)
00163 return AVERROR(ENOMEM);
00164 pkt->stream_index = 0;
00165 if(pal_size) memcpy(pkt->data, pal, pal_size);
00166 memcpy(pkt->data + pal_size, buf, 4);
00167 c->frames--;
00168 c->vidpos = url_ftell(s->pb);
00169 c->readvid = 0;
00170 return 0;
00171 case MKTAG('C', 'M', 'A', 'P'):
00172 pal_size = 768+4;
00173 memcpy(pal, buf, 4);
00174 get_buffer(s->pb, pal + 4, 768);
00175 break;
00176 case MKTAG('F', 'R', 'A', 'M'):
00177 get_buffer(s->pb, buf + 4, DXA_EXTRA_SIZE - 4);
00178 size = AV_RB32(buf + 5);
00179 if(size > 0xFFFFFF){
00180 av_log(s, AV_LOG_ERROR, "Frame size is too big: %d\n", size);
00181 return -1;
00182 }
00183 if(av_new_packet(pkt, size + DXA_EXTRA_SIZE + pal_size) < 0)
00184 return AVERROR(ENOMEM);
00185 memcpy(pkt->data + pal_size, buf, DXA_EXTRA_SIZE);
00186 ret = get_buffer(s->pb, pkt->data + DXA_EXTRA_SIZE + pal_size, size);
00187 if(ret != size){
00188 av_free_packet(pkt);
00189 return AVERROR(EIO);
00190 }
00191 if(pal_size) memcpy(pkt->data, pal, pal_size);
00192 pkt->stream_index = 0;
00193 c->frames--;
00194 c->vidpos = url_ftell(s->pb);
00195 c->readvid = 0;
00196 return 0;
00197 default:
00198 av_log(s, AV_LOG_ERROR, "Unknown tag %c%c%c%c\n", buf[0], buf[1], buf[2], buf[3]);
00199 return -1;
00200 }
00201 }
00202 return AVERROR(EIO);
00203 }
00204
00205 AVInputFormat dxa_demuxer = {
00206 "dxa",
00207 "dxa",
00208 sizeof(DXAContext),
00209 dxa_probe,
00210 dxa_read_header,
00211 dxa_read_packet,
00212 };