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/*
* codec2 encoder/decoder using libcodec2
* Copyright (c) 2017 Tomas Härdin
*
* 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
*/
#include <codec2/codec2.h>
#include "avcodec.h"
#include "libavutil/opt.h"
#include "internal.h"
#include "codec2utils.h"
typedef struct {
const AVClass *class;
struct CODEC2 *codec;
int mode;
} LibCodec2Context;
static const AVOption options[] = {
//not AV_OPT_FLAG_DECODING_PARAM since mode should come from the demuxer
//1300 (aka FreeDV 1600) is the most common mode on-the-air, default to it here as well
CODEC2_AVOPTIONS("codec2 mode", LibCodec2Context, 0, 4 /*CODEC2_MODE_1300*/, AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_ENCODING_PARAM),
{ NULL },
};
static const AVClass libcodec2_enc_class = {
.class_name = "libcodec2 encoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static const AVClass libcodec2_dec_class = {
.class_name = "libcodec2 decoder",
.item_name = av_default_item_name,
.version = LIBAVUTIL_VERSION_INT,
};
static av_cold int libcodec2_init_common(AVCodecContext *avctx, int mode)
{
LibCodec2Context *c2 = avctx->priv_data;
//Grab mode name from options, unless it's some weird number.
const char *modename = mode >= 0 && mode <= CODEC2_MODE_MAX ? options[mode+1].name : "?";
c2->codec = codec2_create(mode);
if (!c2->codec) {
//Out of memory or unsupported mode. The latter seems most likely,
//but we can't tell for sure with the current API.
goto libcodec2_init_common_error;
}
avctx->frame_size = codec2_samples_per_frame(c2->codec);
avctx->block_align = (codec2_bits_per_frame(c2->codec) + 7) / 8;
if (avctx->frame_size <= 0 || avctx->block_align <= 0) {
//codec2_create() may succeed for some modes but still fail at codec2_samples_per_frame()
//example is -mode 700C on libcodec2 0.4
codec2_destroy(c2->codec);
c2->codec = NULL;
goto libcodec2_init_common_error;
}
codec2_set_natural_or_gray(c2->codec, 1);
return 0;
libcodec2_init_common_error:
av_log(avctx, AV_LOG_ERROR,
"Mode %i (%s) not supported with the linked version of libcodec2\n",
mode, modename);
return AVERROR(EINVAL);
}
static av_cold int libcodec2_init_decoder(AVCodecContext *avctx)
{
avctx->sample_rate = 8000;
avctx->channels = 1;
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
avctx->channel_layout = AV_CH_LAYOUT_MONO;
if (avctx->extradata_size != CODEC2_EXTRADATA_SIZE) {
av_log(avctx, AV_LOG_ERROR, "must have exactly %i bytes of extradata (got %i)\n",
CODEC2_EXTRADATA_SIZE, avctx->extradata_size);
return AVERROR_INVALIDDATA;
}
return libcodec2_init_common(avctx, codec2_mode_from_extradata(avctx->extradata));
}
static av_cold int libcodec2_init_encoder(AVCodecContext *avctx)
{
LibCodec2Context *c2 = avctx->priv_data;
//will need to be smarter once we get wideband support
if (avctx->sample_rate != 8000 ||
avctx->channels != 1 ||
avctx->sample_fmt != AV_SAMPLE_FMT_S16) {
av_log(avctx, AV_LOG_ERROR, "only 8 kHz 16-bit mono allowed\n");
return AVERROR(EINVAL);
}
avctx->extradata = av_mallocz(CODEC2_EXTRADATA_SIZE + AV_INPUT_BUFFER_PADDING_SIZE);
if (!avctx->extradata) {
return AVERROR(ENOMEM);
}
avctx->extradata_size = CODEC2_EXTRADATA_SIZE;
codec2_make_extradata(avctx->extradata, c2->mode);
return libcodec2_init_common(avctx, c2->mode);
}
static av_cold int libcodec2_close(AVCodecContext *avctx)
{
LibCodec2Context *c2 = avctx->priv_data;
codec2_destroy(c2->codec);
return 0;
}
static int libcodec2_decode(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *pkt)
{
LibCodec2Context *c2 = avctx->priv_data;
AVFrame *frame = data;
int ret, nframes, i;
uint8_t *input;
int16_t *output;
nframes = pkt->size / avctx->block_align;
frame->nb_samples = avctx->frame_size * nframes;
ret = ff_get_buffer(avctx, frame, 0);
if (ret < 0) {
return ret;
}
input = pkt->data;
output = (int16_t *)frame->data[0];
for (i = 0; i < nframes; i++) {
codec2_decode(c2->codec, output, input);
input += avctx->block_align;
output += avctx->frame_size;
}
*got_frame_ptr = nframes > 0;
return nframes * avctx->block_align;
}
static int libcodec2_encode(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet_ptr)
{
LibCodec2Context *c2 = avctx->priv_data;
int16_t *samples = (int16_t *)frame->data[0];
int ret = ff_alloc_packet2(avctx, avpkt, avctx->block_align, 0);
if (ret < 0) {
return ret;
}
codec2_encode(c2->codec, avpkt->data, samples);
*got_packet_ptr = 1;
return 0;
}
const AVCodec ff_libcodec2_decoder = {
.name = "libcodec2",
.long_name = NULL_IF_CONFIG_SMALL("codec2 decoder using libcodec2"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_CODEC2,
.priv_data_size = sizeof(LibCodec2Context),
.init = libcodec2_init_decoder,
.close = libcodec2_close,
.decode = libcodec2_decode,
.capabilities = AV_CODEC_CAP_CHANNEL_CONF,
.supported_samplerates = (const int[]){ 8000, 0 },
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE },
.channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO, 0 },
.priv_class = &libcodec2_dec_class,
};
const AVCodec ff_libcodec2_encoder = {
.name = "libcodec2",
.long_name = NULL_IF_CONFIG_SMALL("codec2 encoder using libcodec2"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_CODEC2,
.priv_data_size = sizeof(LibCodec2Context),
.init = libcodec2_init_encoder,
.close = libcodec2_close,
.encode2 = libcodec2_encode,
.capabilities = 0,
.supported_samplerates = (const int[]){ 8000, 0 },
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE },
.channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO, 0 },
.priv_class = &libcodec2_enc_class,
};
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