public static int ogg_stream_packetout(ogg_stream_state os, ogg_packet op)
{
if (ogg_stream_check(os) != 0)
{
return(0);
}
return(_packetout(os, op, 1));
}
static ushort[] convbuffer = new ushort[4096]; /* take 8k out of the data segment, not the stack */
//static long convsize = 4096;
public static void Main(string[] args)
{
/* sync and verify incoming physical bitstream */
var oy = new ogg_sync_state();
/* take physical pages, weld into a logical stream of packets */
var os = new ogg_stream_state();
/* one Ogg bitstream page. Vorbis packets are inside */
var og = new ogg_page();
/* one raw packet of data for decode */
var op = new ogg_packet();
/* struct that stores all the static vorbis bitstream settings */
var vi = new vorbis_info();
/* struct that stores all the bitstream user comments */
var vc = new vorbis_comment();
/* central working state for the packet->PCM decoder */
var vd = new vorbis_dsp_state();
/* local working space for packet->PCM decode */
var vb = new vorbis_block();
var stdin = Console.OpenStandardInput();
var stdout = Console.OpenStandardOutput();
var stderr = Console.OpenStandardError();
/********** Decode setup ************/
ogg_sync_init(oy); /* Now we can read pages */
while (true)
{ /* we repeat if the bitstream is chained */
/* grab some data at the head of the stream. We want the first page
* (which is guaranteed to be small and only contain the Vorbis
* stream initial header) We need the first page to get the stream
* serialno. */
/* submit a 4k block to libvorbis' Ogg layer */
var buffer = ogg_sync_buffer(oy, 4096);
int bytes = fread(buffer, 1, 4096, stdin);
ogg_sync_wrote(oy, bytes);
/* Get the first page. */
if (ogg_sync_pageout(oy, og) != 1)
{
/* have we simply run out of data? If so, we're done. */
if (bytes < 4096)
{
break;
}
/* error case. Must not be Vorbis data */
fprintf(stderr, "Input does not appear to be an Ogg bitstream.\n");
exit(1);
}
/* get the serial number and set up the rest of decode. */
/* serialno first; use it to set up a logical stream */
ogg_stream_init(os, ogg_page_serialno(og));
/* extract the initial header from the first page and verify that the
* ogg bitstream is in fact vorbis data */
/* i handle the initial header first instead of just having the code
* read all three vorbis headers at once because reading the initial
* header is an easy way to identify a vorbis bitstream and it's
* useful to see that functionality seperated out. */
vorbis_info_init(vi);
vorbis_comment_init(vc);
if (ogg_stream_pagein(os, og) < 0)
{
/* error; stream version mismatch perhaps */
fprintf(stderr, "error reading first page of ogg bitstream data.\n");
exit(1);
}
if (ogg_stream_packetout(os, op) != 1)
{
/* no page? must not be vorbis */
fprintf(stderr, "error reading initial header packet.\n");
exit(1);
}
if (vorbis_synthesis_headerin(vi, vc, op) < 0)
{
/* error case; not a vorbis header */
fprintf(stderr, "this ogg bitstream does not contain vorbis audio data.\n");
exit(1);
}
//// /* At this point, we're sure we're Vorbis. We've set up the logical
//// (Ogg) bitstream decoder. Get the comment and codebook headers and
//// set up the Vorbis decoder */
//// /* The next two packets in order are the comment and codebook headers.
//// They're likely large and may span multiple pages. Thus we read
//// and submit data until we get our two packets, watching that no
//// pages are missing. If a page is missing, error out; losing a
//// header page is the only place where missing data is fatal. */
//// i = 0;
//// while (i < 2)
//// {
//// while (i < 2)
//// {
//// int result = ogg_sync_pageout(oggSyncState, oggPage);
//// if (result == 0) break; /* Need more data */
//// /* Don't complain about missing or corrupt data yet. We'll
//// catch it at the packet output phase */
//// if (result == 1)
//// {
//// ogg_stream_pagein(oggStreamState, oggPage); /* we can ignore any errors here
//// as they'll also become apparent
//// at packetout */
//// while (i < 2)
//// {
//// result = ogg_stream_packetout(oggStreamState, oggPacket);
//// if (result == 0) break;
//// if (result < 0)
//// {
//// /* Uh oh; data at some point was corrupted or missing!
//// We can't tolerate that in a header. Die. */
//// fprintf(stderr, "Corrupt secondary header. Exiting.\n");
//// exit(1);
//// }
//// result = vorbis_synthesis_headerin(vorbisInfo, vorbisComment, oggPacket);
//// if (result < 0)
//// {
//// fprintf(stderr, "Corrupt secondary header. Exiting.\n");
//// exit(1);
//// }
//// i++;
//// }
//// }
//// }
//// /* no harm in not checking before adding more */
//// buffer = ogg_sync_buffer(oggSyncState, 4096);
//// bytes = fread(buffer, 1, 4096, stdin);
//// if (bytes == 0 && i < 2)
//// {
//// fprintf(stderr, "End of file before finding all Vorbis headers!\n");
//// exit(1);
//// }
//// ogg_sync_wrote(oggSyncState, bytes);
//// }
//// /* Throw the comments plus a few lines about the bitstream we're
//// decoding */
//// {
//// char** ptr = vorbisComment.user_comments;
//// while (*ptr)
//// {
//// fprintf(stderr, "%s\n", *ptr);
//// ++ptr;
//// }
//// fprintf(stderr, "\nBitstream is %d channel, %ldHz\n", vorbisInfo.channels, vorbisInfo.rate);
//// fprintf(stderr, "Encoded by: %s\n\n", vorbisComment.vendor);
//// }
//// convsize = 4096 / vorbisInfo.channels;
//// /* OK, got and parsed all three headers. Initialize the Vorbis
//// packet->PCM decoder. */
//// if (vorbis_synthesis_init(vorbisDspState, vorbisInfo) == 0)
//// { /* central decode state */
//// vorbis_block_init(vorbisDspState, vorbisBlock); /* local state for most of the decode
//// so multiple block decodes can
//// proceed in parallel. We could init
//// multiple vorbis_block structures
//// for vd here */
//// /* The rest is just a straight decode loop until end of stream */
//// while (eos == 0)
//// {
//// while (eos == 0)
//// {
//// int result = ogg_sync_pageout(oggSyncState, oggPage);
//// if (result == 0) break; /* need more data */
//// if (result < 0)
//// { /* missing or corrupt data at this page position */
//// fprintf(stderr, "Corrupt or missing data in bitstream; "
//// "continuing...\n");
//// }
//// else
//// {
//// ogg_stream_pagein(oggStreamState, oggPage); /* can safely ignore errors at
//// this point */
//// while (1)
//// {
//// result = ogg_stream_packetout(&oggStreamState, &oggPacket);
//// if (result == 0) break; /* need more data */
//// if (result < 0)
//// { /* missing or corrupt data at this page position */
//// /* no reason to complain; already complained above */
//// }
//// else
//// {
//// /* we have a packet. Decode it */
//// float** pcm;
//// int samples;
//// if (vorbis_synthesis(&vorbisBlock, &oggPacket) == 0) /* test for success! */
//// vorbis_synthesis_blockin(&vorbisDspState, &vorbisBlock);
//// /*
//// **pcm is a multichannel float vector. In stereo, for
//// example, pcm[0] is left, and pcm[1] is right. samples is
//// the size of each channel. Convert the float values
//// (-1.<=range<=1.) to whatever PCM format and write it out */
//// while ((samples = vorbis_synthesis_pcmout(&vorbisDspState, &pcm)) > 0)
//// {
//// int j;
//// int clipflag = 0;
//// int bout = (samples < convsize ? samples : convsize);
//// /* convert floats to 16 bit signed ints (host order) and
//// interleave */
//// for (i = 0; i < vorbisInfo.channels; i++)
//// {
//// ogg_int16_t* ptr = convbuffer + i;
//// float* mono = pcm[i];
//// for (j = 0; j < bout; j++)
//// {
////#if 1
//// int val=floor(mono[j]*32767.f+.5f);
////#else /* optional dither */
//// int val = mono[j] * 32767.f + drand48() - 0.5f;
////#endif
//// /* might as well guard against clipping */
//// if (val > 32767)
//// {
//// val = 32767;
//// clipflag = 1;
//// }
//// if (val < -32768)
//// {
//// val = -32768;
//// clipflag = 1;
//// }
//// *ptr = val;
//// ptr += vorbisInfo.channels;
//// }
//// }
//// if (clipflag)
//// fprintf(stderr, "Clipping in frame %ld\n", (long)(vorbisDspState.sequence));
//// fwrite(convbuffer, 2 * vorbisInfo.channels, bout, stdout);
//// vorbis_synthesis_read(vorbisDspState, bout); /* tell libvorbis how
//// many samples we
//// actually consumed */
//// }
//// }
//// }
//// if (ogg_page_eos(oggPage) != 0) eos = 1;
//// }
//// }
//// if (eos == 0)
//// {
//// buffer = ogg_sync_buffer(oggSyncState, 4096);
//// bytes = fread(buffer, 1, 4096, stdin);
//// ogg_sync_wrote(oggSyncState, bytes);
//// if (bytes == 0) eos = 1;
//// }
//// }
//// /* ogg_page and ogg_packet structs always point to storage in
//// libvorbis. They're never freed or manipulated directly */
//// vorbis_block_clear(vorbisBlock);
//// vorbis_dsp_clear(vorbisDspState);
//// }
//// else
//// {
//// fprintf(stderr, "Error: Corrupt header during playback initialization.\n");
//// }
//// /* clean up this logical bitstream; before exit we see if we're
//// followed by another [chained] */
//// ogg_stream_clear(oggStreamState);
//// vorbis_comment_clear(vorbisComment);
//// vorbis_info_clear(vorbisInfo); /* must be called last */
}
/* OK, clean up the framer */
ogg_sync_clear(oy);
fprintf(stderr, "Done.\n");
}
public static int _packetout(ogg_stream_state os, ogg_packet op, int adv)
{
/* The last part of decode. We have the stream broken into packet
* segments. Now we need to group them into packets (or return the
* out of sync markers) */
long ptr = os.lacing_returned;
if (os.lacing_packet <= ptr)
{
return(0);
}
if ((os.lacing_vals[ptr] & 0x400) != 0)
{
/* we need to tell the codec there's a gap; it might need to
* handle previous packet dependencies. */
os.lacing_returned++;
os.packetno++;
return(-1);
}
if (op == null && adv == 0)
{
return(1); /* just using peek as an inexpensive way
* to ask if there's a whole packet
* waiting */
}
/* Gather the whole packet. We'll have no holes or a partial packet */
{
int size = os.lacing_vals[ptr] & 0xff;
long bytes = size;
int eos = os.lacing_vals[ptr] & 0x200; /* last packet of the stream? */
int bos = os.lacing_vals[ptr] & 0x100; /* first packet of the stream? */
while (size == 255)
{
int val = os.lacing_vals[++ptr];
size = val & 0xff;
if ((val & 0x200) != 0)
{
eos = 0x200;
}
bytes += size;
}
if (op != null)
{
op.e_o_s = eos;
op.b_o_s = bos;
op.packet = os.body_data + os.body_returned;
op.packetno = os.packetno;
op.granulepos = os.granule_vals[ptr];
op.bytes = bytes;
}
if (adv != 0)
{
os.body_returned += bytes;
os.lacing_returned = ptr + 1;
os.packetno++;
}
}
return(1);
}
/* The Vorbis header is in three packets; the initial small packet in
* the first page that identifies basic parameters, a second packet
* with bitstream comments and a third packet that holds the
* codebook. */
public static int vorbis_synthesis_headerin(vorbis_info vi, vorbis_comment vc, ogg_packet op)
{
oggpack_buffer opb = new oggpack_buffer();
if (op != null)
{
oggpack_readinit(opb, op.packet, op.bytes);
/* Which of the three types of header is this? */
/* Also verify header-ness, vorbis */
{
var buffer = new ArrayPointer();
long packtype = oggpack_read(opb, 8);
//memset(buffer, 0, 6);
_v_readstring(opb, buffer, 6);
if (memcmp(buffer, "vorbis", 6) != 0)
{
/* not a vorbis header */
return(OV_ENOTVORBIS);
}
switch (packtype)
{
case 0x01: /* least significant *bit* is read first */
if (op.b_o_s == 0)
{
/* Not the initial packet */
return(OV_EBADHEADER);
}
if (vi.rate != 0)
{
/* previously initialized info header */
return(OV_EBADHEADER);
}
return(_vorbis_unpack_info(vi, opb));
case 0x03: /* least significant *bit* is read first */
if (vi.rate == 0)
{
/* um... we didn't get the initial header */
return(OV_EBADHEADER);
}
if (vc.vendor != null)
{
/* previously initialized comment header */
return(OV_EBADHEADER);
}
return(_vorbis_unpack_comment(vc, opb));
case 0x05: /* least significant *bit* is read first */
if (vi.rate == 0 || vc.vendor == null)
{
/* um... we didn;t get the initial header or comments yet */
return(OV_EBADHEADER);
}
if (vi.codec_setup == null)
{
/* improperly initialized vorbis_info */
return(OV_EFAULT);
}
if (((codec_setup_info)vi.codec_setup).books > 0)
{
/* previously initialized setup header */
return(OV_EBADHEADER);
}
return(_vorbis_unpack_books(vi, opb));
default:
/* Not a valid vorbis header type */
return(OV_EBADHEADER);
//break;
}
}
}
return(OV_EBADHEADER);
}
