134 lines
3.9 KiB
C
134 lines
3.9 KiB
C
/*
|
|
* Silk V3 Audio Encoder
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Silk V3 Audio Encoder Implementation
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "internal.h"
|
|
#include "codec_internal.h"
|
|
#include "libavutil/mem.h"
|
|
#include "libavutil/channel_layout.h"
|
|
#include "libavutil/mem.h"
|
|
|
|
#include <SKP_Silk_SDK_API.h>
|
|
|
|
#define MAX_BYTES_PER_FRAME 250
|
|
#define FRAME_LENGTH_MS 20
|
|
#define MAX_INPUT_FRAMES 5
|
|
|
|
typedef struct SilkEncContext {
|
|
AVClass *class;
|
|
void *context;
|
|
} SilkEncContext;
|
|
|
|
static int silk_encode_init(AVCodecContext *avctx)
|
|
{
|
|
SilkEncContext *silk = avctx->priv_data;
|
|
SKP_SILK_SDK_EncControlStruct control;
|
|
int size, ret;
|
|
|
|
ret = SKP_Silk_SDK_Get_Encoder_Size(&size);
|
|
if (ret)
|
|
return ret;
|
|
|
|
silk->context = av_malloc(size);
|
|
if (!silk->context)
|
|
return AVERROR(ENOMEM);
|
|
|
|
ret = SKP_Silk_SDK_InitEncoder(silk->context, &control);
|
|
if (ret)
|
|
goto out;
|
|
|
|
avctx->frame_size = FRAME_LENGTH_MS * avctx->sample_rate / 1000;
|
|
|
|
return ret;
|
|
|
|
out:
|
|
av_free(silk->context);
|
|
return ret;
|
|
}
|
|
|
|
static int silk_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
|
|
const AVFrame *av_frame, int *got_packet_ptr)
|
|
{
|
|
SilkEncContext *silk = avctx->priv_data;
|
|
SKP_SILK_SDK_EncControlStruct control;
|
|
int ret;
|
|
|
|
/* input must be large enough to encode a complete frame */
|
|
if (av_frame->nb_samples < avctx->frame_size)
|
|
return 0;
|
|
|
|
ret = av_new_packet(avpkt, MAX_BYTES_PER_FRAME * MAX_INPUT_FRAMES);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Set Encoder parameters */
|
|
memset(&control, 0, sizeof(control));
|
|
control.API_sampleRate = avctx->sample_rate;
|
|
control.maxInternalSampleRate = avctx->sample_rate;
|
|
control.packetSize = avctx->frame_size;
|
|
control.bitRate = avctx->bit_rate;
|
|
|
|
ret = SKP_Silk_SDK_Encode(silk->context, &control,
|
|
(const SKP_int16 *)av_frame->data[0],
|
|
av_frame->nb_samples,
|
|
avpkt->data, (SKP_int16 *)&avpkt->size);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*got_packet_ptr = 1;
|
|
return 0;
|
|
}
|
|
|
|
static int silk_encode_close(AVCodecContext *avctx)
|
|
{
|
|
SilkEncContext *silk = avctx->priv_data;
|
|
|
|
if (silk->context)
|
|
av_free(silk->context);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const AVChannelLayout silk_ch_layouts[] = {
|
|
AV_CHANNEL_LAYOUT_MONO,
|
|
{ 0 }
|
|
};
|
|
|
|
const FFCodec ff_silk_encoder = {
|
|
.p.name = "silk",
|
|
.p.long_name = NULL_IF_CONFIG_SMALL("Silk V3 Audio Encoder"),
|
|
.p.type = AVMEDIA_TYPE_AUDIO,
|
|
.p.id = AV_CODEC_ID_SILK,
|
|
.p.capabilities = AV_CODEC_CAP_SMALL_LAST_FRAME,
|
|
.p.ch_layouts = silk_ch_layouts,
|
|
.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
|
|
AV_SAMPLE_FMT_NONE },
|
|
.p.supported_samplerates = (const int[]) { 16000, 0 },
|
|
.priv_data_size = sizeof(SilkEncContext),
|
|
.init = silk_encode_init,
|
|
FF_CODEC_ENCODE_CB(silk_encode_frame),
|
|
.close = silk_encode_close,
|
|
};
|