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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 <opus.h>
#include <opus_multistream.h>
#include <stdlib.h>
/* Internal includes */
#include <config.h>
#include <avdec_private.h>
#include <codecs.h>
#include <opus_header.h>
#define LOG_DOMAIN "audio_opus"
#define MAX_FRAME_SIZE (960*6)
// #define USE_FLOAT
// #define DUMP_PACKETS
typedef struct
{
OpusMSDecoder *dec;
gavl_audio_frame_t * frame;
bgav_opus_header_t h;
} opus_t;
static gavl_source_status_t decode_frame_opus(bgav_stream_t * s)
{
bgav_packet_t * p = NULL;
opus_t * priv;
int result;
gavl_source_status_t st;
gavl_source_status_t ret = GAVL_SOURCE_EOF;
priv = s->decoder_priv;
if((st = bgav_stream_get_packet_read(s, &p)) != GAVL_SOURCE_OK)
return st;
#ifdef DUMP_PACKETS
bgav_packet_dump(p);
#endif
#ifdef USE_FLOAT
result =
opus_multistream_decode_float(priv->dec,
p->data,
p->data_size,
priv->frame->samples.f,
MAX_FRAME_SIZE,
0);
#else
result =
opus_multistream_decode(priv->dec,
p->data,
p->data_size,
priv->frame->samples.s_16,
MAX_FRAME_SIZE,
0);
#endif
if(result <= 0)
goto fail;
// fprintf(stderr, "Decoded %d samples\n", result);
priv->frame->valid_samples = result;
if(priv->frame->valid_samples > p->duration)
priv->frame->valid_samples = p->duration;
gavl_audio_frame_copy_ptrs(s->data.audio.format,
s->data.audio.frame, priv->frame);
ret = GAVL_SOURCE_OK;
fail:
bgav_stream_done_packet_read(s, p);
return ret;
}
static int init_opus(bgav_stream_t * s)
{
opus_t * priv;
bgav_input_context_t * input_mem;
int ret = 0;
int err;
priv = calloc(1, sizeof(*priv));
s->decoder_priv = priv;
/* Parse extradata */
input_mem = bgav_input_open_memory(s->ci.global_header,
s->ci.global_header_len,
s->opt);
if(!bgav_opus_header_read(input_mem, &priv->h))
goto fail;
// bgav_opus_header_dump(&priv->h);
err = 0;
priv->dec =
opus_multistream_decoder_create(s->data.audio.format->samplerate,
s->data.audio.format->num_channels,
priv->h.chtab.stream_count,
priv->h.chtab.coupled_count,
priv->h.chtab.map,
&err);
if(!priv->dec)
{
gavl_log(GAVL_LOG_WARNING, LOG_DOMAIN,
"opus_multistream_decoder_create failed: %s",
opus_strerror(err));
goto fail;
}
#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->samples_per_frame = MAX_FRAME_SIZE;
s->data.audio.format->interleave_mode = GAVL_INTERLEAVE_ALL;
s->data.audio.preroll = MAX_FRAME_SIZE;
if(s->data.audio.format->channel_locations[0] == GAVL_CHID_NONE)
bgav_opus_set_channel_setup(&priv->h,
s->data.audio.format);
/* Samples per frame is just the maximum */
s->src_flags |= GAVL_SOURCE_SRC_FRAMESIZE_MAX;
priv->frame = gavl_audio_frame_create(s->data.audio.format);
/* Apply Gain */
err = opus_multistream_decoder_ctl(priv->dec, OPUS_SET_GAIN(priv->h.output_gain));
if(err != OPUS_OK)
{
gavl_log(GAVL_LOG_WARNING, LOG_DOMAIN, "OPUS_SET_GAIN failed: %s",
opus_strerror(err));
}
ret = 1;
fail:
bgav_input_close(input_mem);
bgav_input_destroy(input_mem);
return ret;
}
static void close_opus(bgav_stream_t * s)
{
opus_t * priv;
priv = s->decoder_priv;
if(priv->dec)
opus_multistream_decoder_destroy(priv->dec);
if(priv->frame)
gavl_audio_frame_destroy(priv->frame);
free(priv);
}
static void resync_opus(bgav_stream_t * s)
{
opus_t * priv;
priv = s->decoder_priv;
opus_multistream_decoder_ctl(priv->dec, OPUS_RESET_STATE);
}
static bgav_audio_decoder_t decoder =
{
.fourccs = (uint32_t[]){ BGAV_MK_FOURCC('O', 'P', 'U', 'S'),
0x00 },
.name = "libopus based decoder",
.init = init_opus,
.decode_frame = decode_frame_opus,
.close = close_opus,
.resync = resync_opus,
};
void bgav_init_audio_decoders_opus()
{
bgav_audio_decoder_register(&decoder);
}
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