-#include "libavutil/intreadwrite.h"
-#include "avformat.h"
-
-// specs say that maximum block size is 1Mb
-#define WV_BLOCK_LIMIT 1047576
-
-#define WV_EXTRA_SIZE 12
-
-enum WV_FLAGS{
- WV_MONO = 0x0004,
- WV_HYBRID = 0x0008,
- WV_JOINT = 0x0010,
- WV_CROSSD = 0x0020,
- WV_HSHAPE = 0x0040,
- WV_FLOAT = 0x0080,
- WV_INT32 = 0x0100,
- WV_HBR = 0x0200,
- WV_HBAL = 0x0400,
- WV_MCINIT = 0x0800,
- WV_MCEND = 0x1000,
-};
-
-static const int wv_rates[16] = {
- 6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
- 32000, 44100, 48000, 64000, 88200, 96000, 192000, -1
-};
-
-typedef struct{
- uint32_t blksize, flags;
- int rate, chan, bpp;
- uint32_t samples, soff;
- int block_parsed;
- uint8_t extra[WV_EXTRA_SIZE];
- int64_t pos;
-}WVContext;
-
-static int wv_probe(AVProbeData *p)
-{
- /* check file header */
- if (p->buf_size <= 32)
- return 0;
- if (p->buf[0] == 'w' && p->buf[1] == 'v' &&
- p->buf[2] == 'p' && p->buf[3] == 'k')
- return AVPROBE_SCORE_MAX;
- else
- return 0;
-}
-
-static int wv_read_block_header(AVFormatContext *ctx, ByteIOContext *pb)
-{
- WVContext *wc = ctx->priv_data;
- uint32_t tag, ver;
- int size;
- int rate, bpp, chan;
-
- wc->pos = url_ftell(pb);
- tag = get_le32(pb);
- if (tag != MKTAG('w', 'v', 'p', 'k'))
- return -1;
- size = get_le32(pb);
- if(size < 24 || size > WV_BLOCK_LIMIT){
- av_log(ctx, AV_LOG_ERROR, "Incorrect block size %i\n", size);
- return -1;
- }
- wc->blksize = size;
- ver = get_le16(pb);
- if(ver < 0x402 || ver > 0x410){
- av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
- return -1;
- }
- get_byte(pb); // track no
- get_byte(pb); // track sub index
- wc->samples = get_le32(pb); // total samples in file
- wc->soff = get_le32(pb); // offset in samples of current block
- get_buffer(pb, wc->extra, WV_EXTRA_SIZE);
- wc->flags = AV_RL32(wc->extra + 4);
- //parse flags
- if(wc->flags & WV_FLOAT){
- av_log(ctx, AV_LOG_ERROR, "Floating point data is not supported\n");
- return -1;
- }
-
- bpp = ((wc->flags & 3) + 1) << 3;
- chan = 1 + !(wc->flags & WV_MONO);
- rate = wv_rates[(wc->flags >> 23) & 0xF];
- if(rate == -1){
- av_log(ctx, AV_LOG_ERROR, "Unknown sampling rate\n");
- return -1;
- }
- if(!wc->bpp) wc->bpp = bpp;
- if(!wc->chan) wc->chan = chan;
- if(!wc->rate) wc->rate = rate;