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/*****************************************************************
* gmerlin-avdecoder - a general purpose multimedia decoding library
*
* Copyright (c) 2001 - 2012 Members of the Gmerlin project
* gmerlin-general@lists.sourceforge.net
* http://gmerlin.sourceforge.net
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* *****************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <avdec_private.h>
#include <codecs.h>
#include <speex/speex.h>
#include <speex/speex_header.h>
#include <speex/speex_stereo.h>
#include <speex/speex_callbacks.h>
#define LOG_DOMAIN "speex"
// #define USE_FLOAT
typedef struct
{
SpeexBits bits;
void *dec_state;
SpeexHeader *header;
SpeexStereoState stereo;
int frame_size;
gavl_audio_frame_t * frame;
} speex_priv_t;
static const SpeexStereoState __stereo = SPEEX_STEREO_STATE_INIT;
static int init_speex(bgav_stream_t * s)
{
SpeexCallback callback;
speex_priv_t * priv;
priv = calloc(1, sizeof(*priv));
s->decoder_priv = priv;
speex_bits_init(&priv->bits);
if(!s->ci.global_header)
{
gavl_log(GAVL_LOG_ERROR, LOG_DOMAIN, "Speex needs extradata");
return 0;
}
priv->header = speex_packet_to_header((char*)s->ci.global_header, s->ci.global_header_len);
if(!priv->header)
return 0;
priv->dec_state = speex_decoder_init(speex_mode_list[priv->header->mode]);
s->data.audio.preroll = priv->frame_size;
/* Set up format */
#ifdef USE_FLOAT
s->data.audio.format.sample_format = GAVL_SAMPLE_FLOAT;
#else
s->data.audio.format->sample_format = GAVL_SAMPLE_S16;
#endif
s->data.audio.format->num_channels = priv->header->nb_channels;
s->data.audio.format->samplerate = priv->header->rate;
s->data.audio.format->interleave_mode = GAVL_INTERLEAVE_ALL;
gavl_set_channel_setup(s->data.audio.format);
speex_decoder_ctl(priv->dec_state, SPEEX_GET_FRAME_SIZE, &priv->frame_size);
s->data.audio.format->samples_per_frame =
priv->frame_size * priv->header->frames_per_packet;
priv->frame = gavl_audio_frame_create(s->data.audio.format);
/* Set stereo callback */
if(priv->header->nb_channels > 1)
{
memcpy(&priv->stereo, &__stereo, sizeof(__stereo));
callback.callback_id = SPEEX_INBAND_STEREO;
callback.func = speex_std_stereo_request_handler;
callback.data = &priv->stereo;
speex_decoder_ctl(priv->dec_state, SPEEX_SET_HANDLER, &callback);
}
gavl_dictionary_set_string(s->m, GAVL_META_FORMAT,
"Speex");
return 1;
}
static gavl_source_status_t decode_frame_speex(bgav_stream_t * s)
{
int i;
bgav_packet_t * p = NULL;
speex_priv_t * priv;
gavl_source_status_t st;
priv = s->decoder_priv;
if((st = bgav_stream_get_packet_read(s, &p)) != GAVL_SOURCE_OK)
return st;
speex_bits_read_from(&priv->bits, (char*)p->data, p->data_size);
for(i = 0; i < priv->header->frames_per_packet; i++)
{
#ifdef USE_FLOAT
speex_decode(priv->dec_state, &priv->bits,
priv->frame->samples.f +
i * priv->frame_size * s->data.audio.format->num_channels);
#else
speex_decode_int(priv->dec_state, &priv->bits,
priv->frame->samples.s_16 +
i * priv->frame_size * s->data.audio.format->num_channels);
#endif
if(s->data.audio.format->num_channels > 1)
{
#ifdef USE_FLOAT
speex_decode_stereo(priv->frame->samples.f +
i * priv->frame_size * s->data.audio.format->num_channels,
priv->frame_size, &priv->stereo);
#else
speex_decode_stereo_int(priv->frame->samples.s_16 +
i * priv->frame_size * s->data.audio.format->num_channels,
priv->frame_size, &priv->stereo);
#endif
}
}
/* Speex output is scaled like int16_t */
#ifdef USE_FLOAT
for(i = 0;
i < priv->frame_size * priv->header->frames_per_packet * s->data.audio.format->num_channels;
i++)
{
priv->frame->samples.f[i] /= 32768.0;
}
#endif
priv->frame->valid_samples = priv->frame_size * priv->header->frames_per_packet;
if(priv->frame->valid_samples > p->duration)
priv->frame->valid_samples = p->duration;
bgav_stream_done_packet_read(s, p);
gavl_audio_frame_copy_ptrs(s->data.audio.format, s->data.audio.frame, priv->frame);
return GAVL_SOURCE_OK;
}
static void close_speex(bgav_stream_t * s)
{
speex_priv_t * priv;
priv = s->decoder_priv;
speex_bits_destroy(&priv->bits);
gavl_audio_frame_destroy(priv->frame);
speex_decoder_destroy(priv->dec_state);
free(priv->header);
free(priv);
}
static bgav_audio_decoder_t decoder =
{
.fourccs = (uint32_t[]){ BGAV_MK_FOURCC('S','P','E','X'), 0x00 },
.name = "Speex decoder",
.init = init_speex,
.decode_frame = decode_frame_speex,
.close = close_speex,
// .resync = resync_speex,
};
void bgav_init_audio_decoders_speex()
{
bgav_audio_decoder_register(&decoder);
}
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