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/* -*- c-basic-offset: 8; -*- */
/* theora.c: Ogg Theora data handlers for libshout
* $Id: theora.c 11416 2006-05-22 00:32:49Z brendan $
*
* Copyright (C) 2004 the Icecast team <team@icecast.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#ifdef HAVE_INTTYPES_H
# include <inttypes.h>
#endif
#include <theora/theora.h>
#include "shout_private.h"
#include "shout_ogg.h"
/* -- local data structures -- */
typedef struct {
theora_info ti;
theora_comment tc;
uint32_t granule_shift;
double per_frame;
uint64_t start_frame;
int initial_frames;
int get_start_frame;
} theora_data_t;
/* -- local prototypes -- */
static int read_theora_page(ogg_codec_t *codec, ogg_page *page);
static void free_theora_data(void *codec_data);
static int theora_ilog(unsigned int v);
/* -- theora functions -- */
int _shout_open_theora(ogg_codec_t *codec, ogg_page *page)
{
ogg_packet packet;
theora_data_t *theora_data = calloc(1, sizeof(theora_data_t));
if (! theora_data)
return SHOUTERR_MALLOC;
theora_info_init(&theora_data->ti);
theora_comment_init(&theora_data->tc);
ogg_stream_packetout(&codec->os, &packet);
if (theora_decode_header(&theora_data->ti, &theora_data->tc, &packet) < 0) {
free_theora_data(theora_data);
return SHOUTERR_UNSUPPORTED;
}
codec->codec_data = theora_data;
codec->read_page = read_theora_page;
codec->free_data = free_theora_data;
codec->headers = 1;
theora_data->initial_frames = 0;
return SHOUTERR_SUCCESS;
}
static int read_theora_page(ogg_codec_t *codec, ogg_page *page)
{
theora_data_t *theora_data = codec->codec_data;
ogg_packet packet;
ogg_int64_t granulepos, iframe, pframe;
granulepos = ogg_page_granulepos(page);
if (granulepos == 0)
{
while (ogg_stream_packetout(&codec->os, &packet) > 0) {
if (theora_decode_header(&theora_data->ti, &theora_data->tc, &packet) < 0)
return SHOUTERR_INSANE;
codec->headers++;
}
if (codec->headers == 3)
{
theora_data->granule_shift = theora_ilog(theora_data->ti.keyframe_frequency_force - 1);
theora_data->per_frame = (double)theora_data->ti.fps_denominator / theora_data->ti.fps_numerator * 1000000;
theora_data->get_start_frame = 1;
}
return SHOUTERR_SUCCESS;
}
while (ogg_stream_packetout(&codec->os, &packet) > 0)
{
if (theora_data->get_start_frame)
theora_data->initial_frames++;
}
if (granulepos > 0 && codec->headers >= 3)
{
iframe = granulepos >> theora_data->granule_shift;
pframe = granulepos - (iframe << theora_data->granule_shift);
if (theora_data->get_start_frame)
{
/* work out the real start frame, which may not be 0 */
theora_data->start_frame = iframe + pframe - theora_data->initial_frames;
codec->senttime = 0;
theora_data->get_start_frame = 0;
}
else
{
uint64_t frames = ((iframe + pframe) - theora_data->start_frame);
codec->senttime = (uint64_t)(frames * theora_data->per_frame);
}
}
return SHOUTERR_SUCCESS;
}
static void free_theora_data(void *codec_data)
{
theora_data_t *theora_data = (theora_data_t *)codec_data;
theora_info_clear(&theora_data->ti);
theora_comment_clear(&theora_data->tc);
free(theora_data);
}
static int theora_ilog(unsigned int v)
{
int ret = 0;
while (v) {
ret++;
v >>= 1;
}
return ret;
}
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