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00022 #include "libavutil/channel_layout.h"
00023 #include "libavutil/intreadwrite.h"
00024 #include "avformat.h"
00025 #include "internal.h"
00026 #include "avio_internal.h"
00027
00028 enum SIFFTags{
00029 TAG_SIFF = MKTAG('S', 'I', 'F', 'F'),
00030 TAG_BODY = MKTAG('B', 'O', 'D', 'Y'),
00031 TAG_VBHD = MKTAG('V', 'B', 'H', 'D'),
00032 TAG_SHDR = MKTAG('S', 'H', 'D', 'R'),
00033 TAG_VBV1 = MKTAG('V', 'B', 'V', '1'),
00034 TAG_SOUN = MKTAG('S', 'O', 'U', 'N'),
00035 };
00036
00037 enum VBFlags{
00038 VB_HAS_GMC = 0x01,
00039 VB_HAS_AUDIO = 0x04,
00040 VB_HAS_VIDEO = 0x08,
00041 VB_HAS_PALETTE = 0x10,
00042 VB_HAS_LENGTH = 0x20
00043 };
00044
00045 typedef struct SIFFContext{
00046 int frames;
00047 int cur_frame;
00048 int rate;
00049 int bits;
00050 int block_align;
00051
00052 int has_video;
00053 int has_audio;
00054
00055 int curstrm;
00056 int pktsize;
00057 int gmcsize;
00058 int sndsize;
00059
00060 int flags;
00061 uint8_t gmc[4];
00062 }SIFFContext;
00063
00064 static int siff_probe(AVProbeData *p)
00065 {
00066 uint32_t tag = AV_RL32(p->buf + 8);
00067
00068 if (AV_RL32(p->buf) != TAG_SIFF ||
00069 (tag != TAG_VBV1 && tag != TAG_SOUN))
00070 return 0;
00071 return AVPROBE_SCORE_MAX;
00072 }
00073
00074 static int create_audio_stream(AVFormatContext *s, SIFFContext *c)
00075 {
00076 AVStream *ast;
00077 ast = avformat_new_stream(s, NULL);
00078 if (!ast)
00079 return AVERROR(ENOMEM);
00080 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00081 ast->codec->codec_id = AV_CODEC_ID_PCM_U8;
00082 ast->codec->channels = 1;
00083 ast->codec->channel_layout = AV_CH_LAYOUT_MONO;
00084 ast->codec->bits_per_coded_sample = 8;
00085 ast->codec->sample_rate = c->rate;
00086 avpriv_set_pts_info(ast, 16, 1, c->rate);
00087 ast->start_time = 0;
00088 return 0;
00089 }
00090
00091 static int siff_parse_vbv1(AVFormatContext *s, SIFFContext *c, AVIOContext *pb)
00092 {
00093 AVStream *st;
00094 int width, height;
00095
00096 if (avio_rl32(pb) != TAG_VBHD){
00097 av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
00098 return AVERROR_INVALIDDATA;
00099 }
00100 if(avio_rb32(pb) != 32){
00101 av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
00102 return AVERROR_INVALIDDATA;
00103 }
00104 if(avio_rl16(pb) != 1){
00105 av_log(s, AV_LOG_ERROR, "Incorrect header version\n");
00106 return AVERROR_INVALIDDATA;
00107 }
00108 width = avio_rl16(pb);
00109 height = avio_rl16(pb);
00110 avio_skip(pb, 4);
00111 c->frames = avio_rl16(pb);
00112 if(!c->frames){
00113 av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
00114 return AVERROR_INVALIDDATA;
00115 }
00116 c->bits = avio_rl16(pb);
00117 c->rate = avio_rl16(pb);
00118 c->block_align = c->rate * (c->bits >> 3);
00119
00120 avio_skip(pb, 16);
00121
00122 st = avformat_new_stream(s, NULL);
00123 if (!st)
00124 return AVERROR(ENOMEM);
00125 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00126 st->codec->codec_id = AV_CODEC_ID_VB;
00127 st->codec->codec_tag = MKTAG('V', 'B', 'V', '1');
00128 st->codec->width = width;
00129 st->codec->height = height;
00130 st->codec->pix_fmt = AV_PIX_FMT_PAL8;
00131 avpriv_set_pts_info(st, 16, 1, 12);
00132
00133 c->cur_frame = 0;
00134 c->has_video = 1;
00135 c->has_audio = !!c->rate;
00136 c->curstrm = -1;
00137 if (c->has_audio && create_audio_stream(s, c) < 0)
00138 return AVERROR(ENOMEM);
00139 return 0;
00140 }
00141
00142 static int siff_parse_soun(AVFormatContext *s, SIFFContext *c, AVIOContext *pb)
00143 {
00144 if (avio_rl32(pb) != TAG_SHDR){
00145 av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
00146 return AVERROR_INVALIDDATA;
00147 }
00148 if(avio_rb32(pb) != 8){
00149 av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
00150 return AVERROR_INVALIDDATA;
00151 }
00152 avio_skip(pb, 4);
00153 c->rate = avio_rl16(pb);
00154 c->bits = avio_rl16(pb);
00155 c->block_align = c->rate * (c->bits >> 3);
00156 return create_audio_stream(s, c);
00157 }
00158
00159 static int siff_read_header(AVFormatContext *s)
00160 {
00161 AVIOContext *pb = s->pb;
00162 SIFFContext *c = s->priv_data;
00163 uint32_t tag;
00164 int ret;
00165
00166 if (avio_rl32(pb) != TAG_SIFF)
00167 return AVERROR_INVALIDDATA;
00168 avio_skip(pb, 4);
00169 tag = avio_rl32(pb);
00170
00171 if (tag != TAG_VBV1 && tag != TAG_SOUN){
00172 av_log(s, AV_LOG_ERROR, "Not a VBV file\n");
00173 return AVERROR_INVALIDDATA;
00174 }
00175
00176 if (tag == TAG_VBV1 && (ret = siff_parse_vbv1(s, c, pb)) < 0)
00177 return ret;
00178 if (tag == TAG_SOUN && (ret = siff_parse_soun(s, c, pb)) < 0)
00179 return ret;
00180 if (avio_rl32(pb) != MKTAG('B', 'O', 'D', 'Y')){
00181 av_log(s, AV_LOG_ERROR, "'BODY' chunk is missing\n");
00182 return AVERROR_INVALIDDATA;
00183 }
00184 avio_skip(pb, 4);
00185
00186 return 0;
00187 }
00188
00189 static int siff_read_packet(AVFormatContext *s, AVPacket *pkt)
00190 {
00191 SIFFContext *c = s->priv_data;
00192 int size;
00193
00194 if (c->has_video){
00195 if (c->cur_frame >= c->frames)
00196 return AVERROR_EOF;
00197 if (c->curstrm == -1){
00198 c->pktsize = avio_rl32(s->pb) - 4;
00199 c->flags = avio_rl16(s->pb);
00200 c->gmcsize = (c->flags & VB_HAS_GMC) ? 4 : 0;
00201 if (c->gmcsize)
00202 avio_read(s->pb, c->gmc, c->gmcsize);
00203 c->sndsize = (c->flags & VB_HAS_AUDIO) ? avio_rl32(s->pb): 0;
00204 c->curstrm = !!(c->flags & VB_HAS_AUDIO);
00205 }
00206
00207 if (!c->curstrm){
00208 size = c->pktsize - c->sndsize - c->gmcsize - 2;
00209 size = ffio_limit(s->pb, size);
00210 if(size < 0 || c->pktsize < c->sndsize)
00211 return AVERROR_INVALIDDATA;
00212 if (av_new_packet(pkt, size + c->gmcsize + 2) < 0)
00213 return AVERROR(ENOMEM);
00214 AV_WL16(pkt->data, c->flags);
00215 if (c->gmcsize)
00216 memcpy(pkt->data + 2, c->gmc, c->gmcsize);
00217 avio_read(s->pb, pkt->data + 2 + c->gmcsize, size);
00218 pkt->stream_index = 0;
00219 c->curstrm = -1;
00220 }else{
00221 if ((size = av_get_packet(s->pb, pkt, c->sndsize - 4)) < 0)
00222 return AVERROR(EIO);
00223 pkt->stream_index = 1;
00224 pkt->duration = size;
00225 c->curstrm = 0;
00226 }
00227 if(!c->cur_frame || c->curstrm)
00228 pkt->flags |= AV_PKT_FLAG_KEY;
00229 if (c->curstrm == -1)
00230 c->cur_frame++;
00231 }else{
00232 size = av_get_packet(s->pb, pkt, c->block_align);
00233 if(!size)
00234 return AVERROR_EOF;
00235 if(size < 0)
00236 return AVERROR(EIO);
00237 pkt->duration = size;
00238 }
00239 return pkt->size;
00240 }
00241
00242 AVInputFormat ff_siff_demuxer = {
00243 .name = "siff",
00244 .long_name = NULL_IF_CONFIG_SMALL("Beam Software SIFF"),
00245 .priv_data_size = sizeof(SIFFContext),
00246 .read_probe = siff_probe,
00247 .read_header = siff_read_header,
00248 .read_packet = siff_read_packet,
00249 .extensions = "vb,son",
00250 };