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00022 #include "avformat.h"
00023 #include "bswap.h"
00024
00025
00026 #define WV_BLOCK_LIMIT 1047576
00027
00028 #define WV_EXTRA_SIZE 12
00029
00030 enum WV_FLAGS{
00031 WV_MONO = 0x0004,
00032 WV_HYBRID = 0x0008,
00033 WV_JOINT = 0x0010,
00034 WV_CROSSD = 0x0020,
00035 WV_HSHAPE = 0x0040,
00036 WV_FLOAT = 0x0080,
00037 WV_INT32 = 0x0100,
00038 WV_HBR = 0x0200,
00039 WV_HBAL = 0x0400,
00040 WV_MCINIT = 0x0800,
00041 WV_MCEND = 0x1000,
00042 };
00043
00044 static const int wv_rates[16] = {
00045 6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
00046 32000, 44100, 48000, 64000, 88200, 96000, 192000, -1
00047 };
00048
00049 typedef struct{
00050 uint32_t blksize, flags;
00051 int rate, chan, bpp;
00052 uint32_t samples, soff;
00053 int block_parsed;
00054 uint8_t extra[WV_EXTRA_SIZE];
00055 int64_t pos;
00056 }WVContext;
00057
00058 static int wv_probe(AVProbeData *p)
00059 {
00060
00061 if (p->buf_size <= 32)
00062 return 0;
00063 if (p->buf[0] == 'w' && p->buf[1] == 'v' &&
00064 p->buf[2] == 'p' && p->buf[3] == 'k')
00065 return AVPROBE_SCORE_MAX;
00066 else
00067 return 0;
00068 }
00069
00070 static int wv_read_block_header(AVFormatContext *ctx, ByteIOContext *pb)
00071 {
00072 WVContext *wc = ctx->priv_data;
00073 uint32_t tag, ver;
00074 int size;
00075 int rate, bpp, chan;
00076
00077 wc->pos = url_ftell(pb);
00078 tag = get_le32(pb);
00079 if (tag != MKTAG('w', 'v', 'p', 'k'))
00080 return -1;
00081 size = get_le32(pb);
00082 if(size < 24 || size > WV_BLOCK_LIMIT){
00083 av_log(ctx, AV_LOG_ERROR, "Incorrect block size %i\n", size);
00084 return -1;
00085 }
00086 wc->blksize = size;
00087 ver = get_le16(pb);
00088 if(ver < 0x402 || ver > 0x410){
00089 av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
00090 return -1;
00091 }
00092 get_byte(pb);
00093 get_byte(pb);
00094 wc->samples = get_le32(pb);
00095 wc->soff = get_le32(pb);
00096 get_buffer(pb, wc->extra, WV_EXTRA_SIZE);
00097 wc->flags = AV_RL32(wc->extra + 4);
00098
00099 if(wc->flags & WV_FLOAT){
00100 av_log(ctx, AV_LOG_ERROR, "Floating point data is not supported\n");
00101 return -1;
00102 }
00103 if(wc->flags & WV_HYBRID){
00104 av_log(ctx, AV_LOG_ERROR, "Hybrid coding mode is not supported\n");
00105 return -1;
00106 }
00107
00108 bpp = ((wc->flags & 3) + 1) << 3;
00109 chan = 1 + !(wc->flags & WV_MONO);
00110 rate = wv_rates[(wc->flags >> 23) & 0xF];
00111 if(rate == -1){
00112 av_log(ctx, AV_LOG_ERROR, "Unknown sampling rate\n");
00113 return -1;
00114 }
00115 if(!wc->bpp) wc->bpp = bpp;
00116 if(!wc->chan) wc->chan = chan;
00117 if(!wc->rate) wc->rate = rate;
00118
00119 if(wc->flags && bpp != wc->bpp){
00120 av_log(ctx, AV_LOG_ERROR, "Bits per sample differ, this block: %i, header block: %i\n", bpp, wc->bpp);
00121 return -1;
00122 }
00123 if(wc->flags && chan != wc->chan){
00124 av_log(ctx, AV_LOG_ERROR, "Channels differ, this block: %i, header block: %i\n", chan, wc->chan);
00125 return -1;
00126 }
00127 if(wc->flags && rate != wc->rate){
00128 av_log(ctx, AV_LOG_ERROR, "Sampling rate differ, this block: %i, header block: %i\n", rate, wc->rate);
00129 return -1;
00130 }
00131 wc->blksize = size - 24;
00132 return 0;
00133 }
00134
00135 static int wv_read_header(AVFormatContext *s,
00136 AVFormatParameters *ap)
00137 {
00138 ByteIOContext *pb = s->pb;
00139 WVContext *wc = s->priv_data;
00140 AVStream *st;
00141
00142 if(wv_read_block_header(s, pb) < 0)
00143 return -1;
00144
00145 wc->block_parsed = 0;
00146
00147 st = av_new_stream(s, 0);
00148 if (!st)
00149 return -1;
00150 st->codec->codec_type = CODEC_TYPE_AUDIO;
00151 st->codec->codec_id = CODEC_ID_WAVPACK;
00152 st->codec->channels = wc->chan;
00153 st->codec->sample_rate = wc->rate;
00154 st->codec->bits_per_sample = wc->bpp;
00155 av_set_pts_info(st, 64, 1, wc->rate);
00156 s->start_time = 0;
00157 s->duration = (int64_t)wc->samples * AV_TIME_BASE / st->codec->sample_rate;
00158 return 0;
00159 }
00160
00161 static int wv_read_packet(AVFormatContext *s,
00162 AVPacket *pkt)
00163 {
00164 WVContext *wc = s->priv_data;
00165 int ret;
00166
00167 if (url_feof(s->pb))
00168 return AVERROR(EIO);
00169 if(wc->block_parsed){
00170 if(wv_read_block_header(s, s->pb) < 0)
00171 return -1;
00172 }
00173
00174 if(av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE) < 0)
00175 return AVERROR(ENOMEM);
00176 memcpy(pkt->data, wc->extra, WV_EXTRA_SIZE);
00177 ret = get_buffer(s->pb, pkt->data + WV_EXTRA_SIZE, wc->blksize);
00178 if(ret != wc->blksize){
00179 av_free_packet(pkt);
00180 return AVERROR(EIO);
00181 }
00182 pkt->stream_index = 0;
00183 wc->block_parsed = 1;
00184 pkt->size = ret + WV_EXTRA_SIZE;
00185 pkt->pts = wc->soff;
00186 av_add_index_entry(s->streams[0], wc->pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
00187 return 0;
00188 }
00189
00190 static int wv_read_close(AVFormatContext *s)
00191 {
00192 return 0;
00193 }
00194
00195 static int wv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
00196 {
00197 AVStream *st = s->streams[stream_index];
00198 WVContext *wc = s->priv_data;
00199 AVPacket pkt1, *pkt = &pkt1;
00200 int ret;
00201 int index = av_index_search_timestamp(st, timestamp, flags);
00202 int64_t pos, pts;
00203
00204
00205 if (index >= 0){
00206 wc->block_parsed = 1;
00207 url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
00208 return 0;
00209 }
00210
00211 if(timestamp < 0 || timestamp >= s->duration)
00212 return -1;
00213
00214 pos = url_ftell(s->pb);
00215 do{
00216 ret = av_read_frame(s, pkt);
00217 if (ret < 0){
00218 url_fseek(s->pb, pos, SEEK_SET);
00219 return -1;
00220 }
00221 pts = pkt->pts;
00222 av_free_packet(pkt);
00223 }while(pts < timestamp);
00224 return 0;
00225 }
00226
00227 AVInputFormat wv_demuxer = {
00228 "wv",
00229 "WavPack",
00230 sizeof(WVContext),
00231 wv_probe,
00232 wv_read_header,
00233 wv_read_packet,
00234 wv_read_close,
00235 wv_read_seek,
00236 };