ref: c082b3928ae1c0c2c9ddb912de4ad048ea03ebe9
dir: /src/vorbis.c/
/*
* Ogg Vorbis sound format driver
* Copyright 2001, Stan Seibert <indigo@aztec.asu.edu>
*
* Portions from oggenc, (c) Michael Smith <msmith@labyrinth.net.au>,
* ogg123, (c) Kenneth Arnold <kcarnold@yahoo.com>, and
* libvorbisfile (c) Xiphophorus Company
*
* May 9, 2001 - Stan Seibert (indigo@aztec.asu.edu)
* Ogg Vorbis driver initially written.
*
* July 5, 1991 - Skeleton file
* Copyright 1991 Lance Norskog And Sundry Contributors
* This source code is freely redistributable and may be used for
* any purpose. This copyright notice must be maintained.
* Lance Norskog And Sundry Contributors are not responsible for
* the consequences of using this software.
*
* TODO: When reading in comments, it doesn't understand how to read
* more then one comment and doesn't know how to parse KEY=value.
*/
#include "st_i.h"
#if defined(HAVE_LIBVORBIS)
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <ogg/ogg.h>
#include <vorbis/codec.h>
#include <vorbis/vorbisfile.h>
#include <vorbis/vorbisenc.h>
#define DEF_BUF_LEN 4096
#define BUF_ERROR -1
#define BUF_EOF 0
#define BUF_DATA 1
#define HEADER_ERROR 0
#define HEADER_OK 1
/* Private data for Ogg Vorbis file */
typedef struct vorbis_enc {
ogg_stream_state os;
ogg_page og;
ogg_packet op;
vorbis_dsp_state vd;
vorbis_block vb;
vorbis_info vi;
} vorbis_enc_t;
typedef struct vorbisstuff {
/* Decoding data */
OggVorbis_File *vf;
char *buf;
int buf_len;
int start;
int end; /* Unsent data samples in buf[start] through buf[end-1] */
int current_section;
int eof;
vorbis_enc_t *vorbis_enc_data;
} *vorbis_t;
/******** Callback functions used in ov_open_callbacks ************/
int myclose (void *datasource)
{
/* Do nothing so sox can close the file for us */
return 0;
}
/* Taken from vorbisfile.c in libvorbis source code */
static int _fseek64_wrap(FILE *f,ogg_int64_t off,int whence){
if(f==NULL)return(-1);
return fseek(f,(int)off,whence);
}
/********************* End callbacks *****************************/
/*
* Do anything required before you start reading samples.
* Read file header.
* Find out sampling rate,
* size and encoding of samples,
* mono/stereo/quad.
*/
int st_vorbisstartread(ft_t ft)
{
vorbis_t vb = (vorbis_t) ft->priv;
vorbis_info *vi;
vorbis_comment *vc;
int comment_size;
int i, offset;
ov_callbacks callbacks = {
(size_t (*)(void *, size_t, size_t, void *)) fread,
(int (*)(void *, ogg_int64_t, int)) _fseek64_wrap,
(int (*)(void *)) myclose,
(long (*)(void *)) ftell
};
/* Allocate space for decoding structure */
vb->vf = (OggVorbis_File *)malloc(sizeof(OggVorbis_File));
if (vb->vf == NULL)
{
st_fail_errno(ft, ST_ENOMEM, "Could not allocate memory");
return (ST_EOF);
}
/* Init the decoder */
if (ov_open_callbacks((void *)ft->fp,vb->vf,NULL,0,callbacks) < 0)
{
st_fail_errno(ft,ST_EHDR,
"Input not an Ogg Vorbis audio stream");
return (ST_EOF);
}
/* Get info about the Ogg Vorbis stream */
vi = ov_info(vb->vf, -1);
vc = ov_comment(vb->vf, -1);
/* Record audio info */
ft->info.rate = vi->rate;
ft->info.size = ST_SIZE_16BIT;
ft->info.encoding = ST_ENCODING_VORBIS;
ft->info.channels = vi->channels;
/* ov_pcm_total doesn't work on non-seekable files so
* skip that step in that case. Also, it reports
* "frame"-ish results so we must * channels.
*/
if (ft->seekable)
ft->length = ov_pcm_total(vb->vf, -1) * ft->info.channels;
/* Record comments */
if (vc->comments == 0)
ft->comment = NULL;
else
{
comment_size = 0;
for (i = 0; i < vc->comments; i++)
comment_size += vc->comment_lengths[i] + 1;
if ((ft->comment = (char *)calloc(comment_size, sizeof(char)))
== NULL)
{
ov_clear(vb->vf);
free(vb->vf);
st_fail_errno(ft, ST_ENOMEM,
"Could not allocate memory");
return (ST_EOF);
}
offset = 0;
for (i = 0; i < vc->comments; i++)
{
strncpy(ft->comment + offset, vc->user_comments[i],
vc->comment_lengths[i]);
offset += vc->comment_lengths[i];
ft->comment[offset] = '\n';
offset++;
}
/* On last comment, end string by overwriting last \n */
if (offset > 0)
offset--;
ft->comment[offset] = 0;
}
/* Setup buffer */
vb->buf_len = DEF_BUF_LEN;
if ((vb->buf = (char *)calloc(vb->buf_len, sizeof(char))) == NULL )
{
ov_clear(vb->vf);
free(vb->vf);
st_fail_errno(ft, ST_ENOMEM, "Could not allocate memory");
return (ST_EOF);
}
vb->start = vb->end = 0;
/* Fill in other info */
vb->eof = 0;
vb->current_section = -1;
return (ST_SUCCESS);
}
/* Refill the buffer with samples. Returns BUF_EOF if the end of the
vorbis data was reached while the buffer was being filled,
BUF_ERROR is something bad happens, and BUF_DATA otherwise */
int refill_buffer (vorbis_t vb)
{
int num_read;
if (vb->start == vb->end) /* Samples all played */
vb->start = vb->end = 0;
while (vb->end < vb->buf_len)
{
num_read = ov_read(vb->vf, vb->buf + vb->end,
vb->buf_len - vb->end, 0, 2, 1,
&vb->current_section);
if (num_read == 0)
return (BUF_EOF);
else if (num_read == OV_HOLE)
st_warn("Warning: hole in stream; probably harmless\n");
else if (num_read < 0)
return (BUF_ERROR);
else
vb->end += num_read;
}
return (BUF_DATA);
}
/*
* Read up to len samples from file.
* Convert to signed longs.
* Place in buf[].
* Return number of samples read.
*/
st_ssize_t st_vorbisread(ft_t ft, st_sample_t *buf, st_ssize_t len)
{
vorbis_t vb = (vorbis_t) ft->priv;
int i;
int ret;
st_sample_t l;
for(i = 0; i < len; i++) {
if (vb->start == vb->end)
{
if (vb->eof)
break;
ret = refill_buffer(vb);
if (ret == BUF_EOF || ret == BUF_ERROR)
{
vb->eof = 1;
if (vb->end == 0)
break;
}
}
l = (vb->buf[vb->start+1]<<24)
| (0xffffff & (vb->buf[vb->start]<<16));
*(buf + i) = l;
vb->start += 2;
}
return i;
}
/*
* Do anything required when you stop reading samples.
* Don't close input file!
*/
int st_vorbisstopread(ft_t ft)
{
vorbis_t vb = (vorbis_t) ft->priv;
free(vb->buf);
ov_clear(vb->vf);
return (ST_SUCCESS);
}
/* Write a page of ogg data to a file. Taken directly from encode.c in
oggenc. Returns the number of bytes written. */
int oe_write_page(ogg_page *page, ft_t ft)
{
int written;
written = st_writebuf(ft, page->header,1,page->header_len);
written += st_writebuf(ft, page->body,1,page->body_len);
return written;
}
/* Write out the header packets. Derived mostly from encode.c in
oggenc. Returns HEADER_ERROR if the header cannot be written and
HEADER_OK otherwise. */
int write_vorbis_header(ft_t ft, vorbis_enc_t *ve)
{
ogg_packet header_main;
ogg_packet header_comments;
ogg_packet header_codebooks;
vorbis_comment vc;
int result;
int ret;
char *comment;
/* Make the comment structure */
vc.user_comments = (char **)calloc(1, sizeof(char *));
vc.comment_lengths = (int *)calloc(1, sizeof(int));
vc.comments = 1;
/* We check if there is a FIELD=value pair already in the comment
* if not, add one */
if (strchr(ft->comment,'=') == NULL)
{
comment = (char *)calloc(1,strlen(ft->comment)+strlen("COMMENT=")+1);
strncpy(comment,"COMMENT=",strlen("COMMENT="));
}
else
comment = (char *)calloc(1,strlen(ft->comment)+1);
strcat(comment,ft->comment);
vc.user_comments[0] = comment;
vc.comment_lengths[0] = strlen(comment);
/* Build the packets */
vorbis_analysis_headerout(&ve->vd,&vc,
&header_main,
&header_comments,
&header_codebooks);
/* And stream them out */
ogg_stream_packetin(&ve->os,&header_main);
ogg_stream_packetin(&ve->os,&header_comments);
ogg_stream_packetin(&ve->os,&header_codebooks);
while((result = ogg_stream_flush(&ve->os, &ve->og)))
{
if(!result) break;
ret = oe_write_page(&ve->og, ft);
if(!ret)
{
free(comment);
return HEADER_ERROR;
}
}
free(comment);
return HEADER_OK;
}
int st_vorbisstartwrite(ft_t ft)
{
vorbis_t vb = (vorbis_t) ft->priv;
vorbis_enc_t *ve;
long rate;
ft->info.size = ST_SIZE_16BIT;
ft->info.encoding = ST_ENCODING_VORBIS;
/* Allocate memory for all of the structures */
ve = vb->vorbis_enc_data = (vorbis_enc_t *)malloc(sizeof(vorbis_enc_t));
if (ve == NULL)
{
st_fail_errno(ft, ST_ENOMEM, "Could not allocate memory");
return (ST_EOF);
}
vorbis_info_init(&ve->vi);
/* DEBUG */
rate = ft->info.rate;
if (rate)
{
st_fail_errno(ft, ST_EHDR, "Error setting up Ogg Vorbis encorder - make sure you've specied a sane rate and number of channels");
}
/* Set encoding to average bit rate of 112kbps VBR */
vorbis_encode_init_vbr(&ve->vi, ft->info.channels, ft->info.rate, 0.3f);
vorbis_analysis_init(&ve->vd, &ve->vi);
vorbis_block_init(&ve->vd, &ve->vb);
st_initrand();
ogg_stream_init(&ve->os, rand()); /* Random serial number */
if (write_vorbis_header(ft, ve) == HEADER_ERROR)
{
st_fail_errno(ft,ST_EHDR,
"Error writing header for Ogg Vorbis audio stream");
return (ST_EOF);
}
return(ST_SUCCESS);
}
st_ssize_t st_vorbiswrite(ft_t ft, st_sample_t *buf, st_ssize_t len)
{
vorbis_t vb = (vorbis_t) ft->priv;
vorbis_enc_t *ve = vb->vorbis_enc_data;
st_ssize_t samples = len / ft->info.channels;
float **buffer = vorbis_analysis_buffer(&ve->vd, samples);
st_ssize_t i, j;
int ret;
int eos = 0;
/* Copy samples into vorbis buffer */
for (i = 0; i < samples; i++)
for (j = 0; j < ft->info.channels; j++)
buffer[j][i] = buf[i*ft->info.channels + j]
/ ((float)ST_SAMPLE_MAX);
vorbis_analysis_wrote(&ve->vd, samples);
while(vorbis_analysis_blockout(&ve->vd,&ve->vb)==1)
{
/* Do the main analysis, creating a packet */
vorbis_analysis(&ve->vb, &ve->op);
vorbis_bitrate_addblock(&ve->vb);
/* Add packet to bitstream */
while (vorbis_bitrate_flushpacket(&ve->vd, &ve->op))
{
ogg_stream_packetin(&ve->os,&ve->op);
/* If we've gone over a page boundary, we can do actual
* output, so do so (for however many pages are available)
*/
while(!eos)
{
int result = ogg_stream_pageout(&ve->os,&ve->og);
if(!result) break;
ret = oe_write_page(&ve->og, ft);
if(!ret)
return (ST_EOF);
if(ogg_page_eos(&ve->og))
eos = 1;
}
}
}
return (len);
}
int st_vorbisstopwrite(ft_t ft)
{
vorbis_t vb = (vorbis_t) ft->priv;
vorbis_enc_t *ve = vb->vorbis_enc_data;
/* Close out the remaining data */
st_vorbiswrite(ft, NULL, 0);
ogg_stream_clear(&ve->os);
vorbis_block_clear(&ve->vb);
vorbis_dsp_clear(&ve->vd);
vorbis_info_clear(&ve->vi);
return (ST_SUCCESS);
}
static char *vorbisnames[] = {
"vorbis",
"ogg",
NULL
};
static st_format_t st_vorbis_format = {
vorbisnames,
NULL,
ST_FILE_STEREO,
st_vorbisstartread,
st_vorbisread,
st_vorbisstopread,
st_vorbisstartwrite,
st_vorbiswrite,
st_vorbisstopwrite,
st_format_nothing_seek
};
const st_format_t *st_vorbis_format_fn(void)
{
return &st_vorbis_format;
}
#endif /* HAVE_LIBVORBIS */