212 lines
6.8 KiB
C
Executable File
212 lines
6.8 KiB
C
Executable File
/*
|
|
* NellyMoser audio decoder
|
|
* Copyright (c) 2007 a840bda5870ba11f19698ff6eb9581dfb0f95fa5,
|
|
* 539459aeb7d425140b62a3ec7dbf6dc8e408a306, and
|
|
* 520e17cd55896441042b14df2566a6eb610ed444
|
|
* Copyright (c) 2007 Loic Minier <lool at dooz.org>
|
|
* Benjamin Larsson
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
* DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* The 3 alphanumeric copyright notices are md5summed they are from the original
|
|
* implementors. The original code is available from http://code.google.com/p/nelly2pcm/
|
|
*/
|
|
|
|
#include "libavutil/channel_layout.h"
|
|
#include "libavutil/float_dsp.h"
|
|
#include "libavutil/lfg.h"
|
|
#include "libavutil/random_seed.h"
|
|
|
|
#define BITSTREAM_READER_LE
|
|
#include "avcodec.h"
|
|
#include "fft.h"
|
|
#include "get_bits.h"
|
|
#include "internal.h"
|
|
#include "nellymoser.h"
|
|
#include "sinewin.h"
|
|
|
|
|
|
typedef struct NellyMoserDecodeContext {
|
|
AVCodecContext* avctx;
|
|
AVLFG random_state;
|
|
GetBitContext gb;
|
|
float scale_bias;
|
|
AVFloatDSPContext *fdsp;
|
|
FFTContext imdct_ctx;
|
|
DECLARE_ALIGNED(32, float, imdct_buf)[2][NELLY_BUF_LEN];
|
|
float *imdct_out;
|
|
float *imdct_prev;
|
|
} NellyMoserDecodeContext;
|
|
|
|
static void nelly_decode_block(NellyMoserDecodeContext *s,
|
|
const unsigned char block[NELLY_BLOCK_LEN],
|
|
float audio[NELLY_SAMPLES])
|
|
{
|
|
int i,j;
|
|
float buf[NELLY_FILL_LEN], pows[NELLY_FILL_LEN];
|
|
float *aptr, *bptr, *pptr, val, pval;
|
|
int bits[NELLY_BUF_LEN];
|
|
unsigned char v;
|
|
|
|
init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8);
|
|
|
|
bptr = buf;
|
|
pptr = pows;
|
|
val = ff_nelly_init_table[get_bits(&s->gb, 6)];
|
|
for (i=0 ; i<NELLY_BANDS ; i++) {
|
|
if (i > 0)
|
|
val += ff_nelly_delta_table[get_bits(&s->gb, 5)];
|
|
pval = -exp2(val/2048) * s->scale_bias;
|
|
for (j = 0; j < ff_nelly_band_sizes_table[i]; j++) {
|
|
*bptr++ = val;
|
|
*pptr++ = pval;
|
|
}
|
|
|
|
}
|
|
|
|
ff_nelly_get_sample_bits(buf, bits);
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
aptr = audio + i * NELLY_BUF_LEN;
|
|
|
|
init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8);
|
|
skip_bits_long(&s->gb, NELLY_HEADER_BITS + i*NELLY_DETAIL_BITS);
|
|
|
|
for (j = 0; j < NELLY_FILL_LEN; j++) {
|
|
if (bits[j] <= 0) {
|
|
aptr[j] = M_SQRT1_2*pows[j];
|
|
if (av_lfg_get(&s->random_state) & 1)
|
|
aptr[j] *= -1.0;
|
|
} else {
|
|
v = get_bits(&s->gb, bits[j]);
|
|
aptr[j] = ff_nelly_dequantization_table[(1<<bits[j])-1+v]*pows[j];
|
|
}
|
|
}
|
|
memset(&aptr[NELLY_FILL_LEN], 0,
|
|
(NELLY_BUF_LEN - NELLY_FILL_LEN) * sizeof(float));
|
|
|
|
s->imdct_ctx.imdct_half(&s->imdct_ctx, s->imdct_out, aptr);
|
|
s->fdsp->vector_fmul_window(aptr, s->imdct_prev + NELLY_BUF_LEN / 2,
|
|
s->imdct_out, ff_sine_128,
|
|
NELLY_BUF_LEN / 2);
|
|
FFSWAP(float *, s->imdct_out, s->imdct_prev);
|
|
}
|
|
}
|
|
|
|
static av_cold int decode_init(AVCodecContext * avctx) {
|
|
NellyMoserDecodeContext *s = avctx->priv_data;
|
|
|
|
s->avctx = avctx;
|
|
s->imdct_out = s->imdct_buf[0];
|
|
s->imdct_prev = s->imdct_buf[1];
|
|
av_lfg_init(&s->random_state, 0);
|
|
ff_mdct_init(&s->imdct_ctx, 8, 1, 1.0);
|
|
|
|
s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
|
|
if (!s->fdsp)
|
|
return AVERROR(ENOMEM);
|
|
|
|
s->scale_bias = 1.0/(32768*8);
|
|
avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
|
|
|
|
/* Generate overlap window */
|
|
if (!ff_sine_128[127])
|
|
ff_init_ff_sine_windows(7);
|
|
|
|
avctx->channels = 1;
|
|
avctx->channel_layout = AV_CH_LAYOUT_MONO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_tag(AVCodecContext *avctx, void *data,
|
|
int *got_frame_ptr, AVPacket *avpkt)
|
|
{
|
|
AVFrame *frame = data;
|
|
const uint8_t *buf = avpkt->data;
|
|
const uint8_t *side=av_packet_get_side_data(avpkt, 'F', NULL);
|
|
int buf_size = avpkt->size;
|
|
NellyMoserDecodeContext *s = avctx->priv_data;
|
|
int blocks, i, ret;
|
|
float *samples_flt;
|
|
|
|
blocks = buf_size / NELLY_BLOCK_LEN;
|
|
|
|
if (blocks <= 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (buf_size % NELLY_BLOCK_LEN) {
|
|
av_log(avctx, AV_LOG_WARNING, "Leftover bytes: %d.\n",
|
|
buf_size % NELLY_BLOCK_LEN);
|
|
}
|
|
/* Normal numbers of blocks for sample rates:
|
|
* 8000 Hz - 1
|
|
* 11025 Hz - 2
|
|
* 16000 Hz - 3
|
|
* 22050 Hz - 4
|
|
* 44100 Hz - 8
|
|
*/
|
|
if(side && blocks>1 && avctx->sample_rate%11025==0 && (1<<((side[0]>>2)&3)) == blocks)
|
|
avctx->sample_rate= 11025*(blocks/2);
|
|
|
|
/* get output buffer */
|
|
frame->nb_samples = NELLY_SAMPLES * blocks;
|
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
|
|
return ret;
|
|
samples_flt = (float *)frame->data[0];
|
|
|
|
for (i=0 ; i<blocks ; i++) {
|
|
nelly_decode_block(s, buf, samples_flt);
|
|
samples_flt += NELLY_SAMPLES;
|
|
buf += NELLY_BLOCK_LEN;
|
|
}
|
|
|
|
*got_frame_ptr = 1;
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
static av_cold int decode_end(AVCodecContext * avctx) {
|
|
NellyMoserDecodeContext *s = avctx->priv_data;
|
|
|
|
ff_mdct_end(&s->imdct_ctx);
|
|
av_freep(&s->fdsp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_nellymoser_decoder = {
|
|
.name = "nellymoser",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Nellymoser Asao"),
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.id = AV_CODEC_ID_NELLYMOSER,
|
|
.priv_data_size = sizeof(NellyMoserDecodeContext),
|
|
.init = decode_init,
|
|
.close = decode_end,
|
|
.decode = decode_tag,
|
|
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_PARAM_CHANGE,
|
|
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLT,
|
|
AV_SAMPLE_FMT_NONE },
|
|
};
|