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/*****************************************************************************
* uleaddvaudio.c
*****************************************************************************
* Copyright (C) 2012 Laurent Aimar
* $Id: dbbd0b476af6da74c2c267c6ed2fabd0f02f2f3e $
*
* Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_codec.h>
#include "../demux/rawdv.h"
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int Open(vlc_object_t *);
static void Close(vlc_object_t *);
vlc_module_begin()
set_description(N_("Ulead DV audio decoder"))
set_capability("decoder", 50)
set_category(CAT_INPUT)
set_subcategory(SUBCAT_INPUT_ACODEC)
set_callbacks(Open, Close)
vlc_module_end()
struct decoder_sys_t
{
date_t end_date;
bool is_pal;
bool is_12bit;
uint16_t shuffle[2000];
};
static block_t *Decode(decoder_t *dec, block_t **block_ptr)
{
decoder_sys_t *sys = dec->p_sys;
if (!block_ptr || !*block_ptr)
return NULL;
block_t *block = *block_ptr;
if (block->i_flags & (BLOCK_FLAG_DISCONTINUITY | BLOCK_FLAG_CORRUPTED)) {
if (block->i_flags & BLOCK_FLAG_CORRUPTED) {
}
date_Set(&sys->end_date, 0);
block_Release(block);
return NULL;
}
if (block->i_pts > VLC_TS_INVALID &&
block->i_pts != date_Get(&sys->end_date))
date_Set(&sys->end_date, block->i_pts);
block->i_pts = VLC_TS_INVALID;
if (!date_Get(&sys->end_date)) {
/* We've just started the stream, wait for the first PTS. */
block_Release(block);
return NULL;
}
const unsigned int block_size = sys->is_pal ? 8640 : 7200;
if (block->i_buffer >= block_size) {
uint8_t *src = block->p_buffer;
block->i_buffer -= block_size;
block->p_buffer += block_size;
int sample_count = dv_get_audio_sample_count(&src[244], sys->is_pal);
block_t *output = decoder_NewAudioBuffer(dec, sample_count);
if (!output)
return NULL;
output->i_pts = date_Get(&sys->end_date);
output->i_length = date_Increment(&sys->end_date, sample_count) - output->i_pts;
int16_t *dst = (int16_t*)output->p_buffer;
for (int i = 0; i < sample_count; i++) {
const uint8_t *v = &src[sys->shuffle[i]];
if (sys->is_12bit) {
*dst++ = dv_audio_12to16((v[0] << 4) | ((v[2] >> 4) & 0x0f));
*dst++ = dv_audio_12to16((v[1] << 4) | ((v[2] >> 0) & 0x0f));
} else {
*dst++ = GetWBE(&v[0]);
*dst++ = GetWBE(&v[sys->is_pal ? 4320 : 3600]);
}
}
return output;
}
block_Release(block);
return NULL;
}
static int Open(vlc_object_t *object)
{
decoder_t *dec = (decoder_t*)object;
if (dec->fmt_in.i_codec != VLC_CODEC_ULEAD_DV_AUDIO_NTSC &&
dec->fmt_in.i_codec != VLC_CODEC_ULEAD_DV_AUDIO_PAL)
return VLC_EGENERIC;
if (dec->fmt_in.audio.i_bitspersample != 12 && dec->fmt_in.audio.i_bitspersample != 16)
return VLC_EGENERIC;
if (dec->fmt_in.audio.i_channels != 2)
return VLC_EGENERIC;
if (dec->fmt_in.audio.i_rate <= 0)
return VLC_EGENERIC;
decoder_sys_t *sys = dec->p_sys = malloc(sizeof(*sys));
if (!sys)
return VLC_ENOMEM;
sys->is_pal = dec->fmt_in.i_codec == VLC_CODEC_ULEAD_DV_AUDIO_PAL;
sys->is_12bit = dec->fmt_in.audio.i_bitspersample == 12;
date_Init(&sys->end_date, dec->fmt_in.audio.i_rate, 1);
date_Set(&sys->end_date, 0);
for (unsigned i = 0; i < sizeof(sys->shuffle) / sizeof(*sys->shuffle); i++) {
const unsigned a = sys->is_pal ? 18 : 15;
const unsigned b = 3 * a;
sys->shuffle[i] = 80 * ((21 * (i % 3) + 9 * (i / 3) + ((i / a) % 3)) % b) +
(2 + sys->is_12bit) * (i / b) + 8;
}
es_format_Init(&dec->fmt_out, AUDIO_ES, VLC_CODEC_S16N);
dec->fmt_out.audio.i_rate = dec->fmt_in.audio.i_rate;
dec->fmt_out.audio.i_channels = 2;
dec->fmt_out.audio.i_physical_channels =
dec->fmt_out.audio.i_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
dec->pf_decode_audio = Decode;
return VLC_SUCCESS;
}
static void Close(vlc_object_t *object)
{
decoder_t *dec = (decoder_t *)object;
free(dec->p_sys);
}
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