forked from KolibriOS/kolibrios
a4b787f4b8
git-svn-id: svn://kolibrios.org@6147 a494cfbc-eb01-0410-851d-a64ba20cac60
153 lines
4.9 KiB
C
153 lines
4.9 KiB
C
/*
|
|
* AMR Audio encoder stub
|
|
* Copyright (c) 2003 The FFmpeg Project
|
|
*
|
|
* 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 <vo-amrwbenc/enc_if.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "libavutil/avstring.h"
|
|
#include "libavutil/internal.h"
|
|
#include "libavutil/mem.h"
|
|
#include "libavutil/opt.h"
|
|
#include "avcodec.h"
|
|
#include "internal.h"
|
|
|
|
#define MAX_PACKET_SIZE (1 + (477 + 7) / 8)
|
|
|
|
typedef struct AMRWBContext {
|
|
AVClass *av_class;
|
|
void *state;
|
|
int mode;
|
|
int last_bitrate;
|
|
int allow_dtx;
|
|
} AMRWBContext;
|
|
|
|
static const AVOption options[] = {
|
|
{ "dtx", "Allow DTX (generate comfort noise)", offsetof(AMRWBContext, allow_dtx), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVClass amrwb_class = {
|
|
"libvo_amrwbenc", av_default_item_name, options, LIBAVUTIL_VERSION_INT
|
|
};
|
|
|
|
static int get_wb_bitrate_mode(int bitrate, void *log_ctx)
|
|
{
|
|
/* make the correspondance between bitrate and mode */
|
|
static const int rates[] = { 6600, 8850, 12650, 14250, 15850, 18250,
|
|
19850, 23050, 23850 };
|
|
int i, best = -1, min_diff = 0;
|
|
char log_buf[200];
|
|
|
|
for (i = 0; i < 9; i++) {
|
|
if (rates[i] == bitrate)
|
|
return i;
|
|
if (best < 0 || abs(rates[i] - bitrate) < min_diff) {
|
|
best = i;
|
|
min_diff = abs(rates[i] - bitrate);
|
|
}
|
|
}
|
|
/* no bitrate matching exactly, log a warning */
|
|
snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
|
|
for (i = 0; i < 9; i++)
|
|
av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i] / 1000.f);
|
|
av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best] / 1000.f);
|
|
av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
|
|
|
|
return best;
|
|
}
|
|
|
|
static av_cold int amr_wb_encode_init(AVCodecContext *avctx)
|
|
{
|
|
AMRWBContext *s = avctx->priv_data;
|
|
|
|
if (avctx->sample_rate != 16000 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
|
|
av_log(avctx, AV_LOG_ERROR, "Only 16000Hz sample rate supported\n");
|
|
return AVERROR(ENOSYS);
|
|
}
|
|
|
|
if (avctx->channels != 1) {
|
|
av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
|
|
return AVERROR(ENOSYS);
|
|
}
|
|
|
|
s->mode = get_wb_bitrate_mode(avctx->bit_rate, avctx);
|
|
s->last_bitrate = avctx->bit_rate;
|
|
|
|
avctx->frame_size = 320;
|
|
avctx->initial_padding = 80;
|
|
|
|
s->state = E_IF_init();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int amr_wb_encode_close(AVCodecContext *avctx)
|
|
{
|
|
AMRWBContext *s = avctx->priv_data;
|
|
|
|
E_IF_exit(s->state);
|
|
return 0;
|
|
}
|
|
|
|
static int amr_wb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
|
|
const AVFrame *frame, int *got_packet_ptr)
|
|
{
|
|
AMRWBContext *s = avctx->priv_data;
|
|
const int16_t *samples = (const int16_t *)frame->data[0];
|
|
int size, ret;
|
|
|
|
if ((ret = ff_alloc_packet2(avctx, avpkt, MAX_PACKET_SIZE, 0)) < 0)
|
|
return ret;
|
|
|
|
if (s->last_bitrate != avctx->bit_rate) {
|
|
s->mode = get_wb_bitrate_mode(avctx->bit_rate, avctx);
|
|
s->last_bitrate = avctx->bit_rate;
|
|
}
|
|
size = E_IF_encode(s->state, s->mode, samples, avpkt->data, s->allow_dtx);
|
|
if (size <= 0 || size > MAX_PACKET_SIZE) {
|
|
av_log(avctx, AV_LOG_ERROR, "Error encoding frame\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if (frame->pts != AV_NOPTS_VALUE)
|
|
avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding);
|
|
|
|
avpkt->size = size;
|
|
*got_packet_ptr = 1;
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_libvo_amrwbenc_encoder = {
|
|
.name = "libvo_amrwbenc",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Android VisualOn AMR-WB "
|
|
"(Adaptive Multi-Rate Wide-Band)"),
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.id = AV_CODEC_ID_AMR_WB,
|
|
.priv_data_size = sizeof(AMRWBContext),
|
|
.init = amr_wb_encode_init,
|
|
.encode2 = amr_wb_encode_frame,
|
|
.close = amr_wb_encode_close,
|
|
.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
|
|
AV_SAMPLE_FMT_NONE },
|
|
.priv_class = &amrwb_class,
|
|
};
|