libavcodec/nellymoserdec.c - play-games/ffmpeg - Git at Google


            
            /*

            
             * 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/mem_internal.h"

            
            #include "libavutil/tx.h"


            #define BITSTREAM_READER_LE

            
            #include "avcodec.h"

            
            #include "codec_internal.h"

            
            #include "decode.h"

            
            #include "get_bits.h"

            
            #include "nellymoser.h"

            
            #include "sinewin.h"


            typedef struct NellyMoserDecodeContext {

            
                AVCodecContext* avctx;

            
                AVLFG           random_state;

            
                GetBitContext   gb;

            
                float           scale_bias;

            
                AVFloatDSPContext *fdsp;

            
                AVTXContext    *imdct_ctx;

            
                av_tx_fn        imdct_fn;

            
                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_fn(s->imdct_ctx, s->imdct_out, aptr, sizeof(float));

            
                    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)

            
            {

            
                int ret;

            
                float scale = 1.0f;

            
                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);

            
                if ((ret = av_tx_init(&s->imdct_ctx, &s->imdct_fn, AV_TX_FLOAT_MDCT,

            
                                      1, 128, &scale, 0)) < 0)

            
                    return ret;


                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;


                av_channel_layout_uninit(&avctx->ch_layout);

            
                avctx->ch_layout      = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;


                /* Generate overlap window */

            
                ff_init_ff_sine_windows(7);


                return 0;

            
            }


            static int decode_tag(AVCodecContext *avctx, AVFrame *frame,

            
                                  int *got_frame_ptr, AVPacket *avpkt)

            
            {

            
                const uint8_t *buf = avpkt->data;

            
                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);

            
                }


                /* 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;


                av_tx_uninit(&s->imdct_ctx);

            
                av_freep(&s->fdsp);


                return 0;

            
            }


            const FFCodec ff_nellymoser_decoder = {

            
                .p.name         = "nellymoser",

            
                CODEC_LONG_NAME("Nellymoser Asao"),

            
                .p.type         = AVMEDIA_TYPE_AUDIO,

            
                .p.id           = AV_CODEC_ID_NELLYMOSER,

            
                .priv_data_size = sizeof(NellyMoserDecodeContext),

            
                .init           = decode_init,

            
                .close          = decode_end,

            
                FF_CODEC_DECODE_CB(decode_tag),

            
                .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_PARAM_CHANGE | AV_CODEC_CAP_CHANNEL_CONF,

            
                .p.sample_fmts  = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLT,

            
                                                                  AV_SAMPLE_FMT_NONE },

            
            };
	/*
	* 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/mem_internal.h"
	#include "libavutil/tx.h"

	#define BITSTREAM_READER_LE
	#include "avcodec.h"
	#include "codec_internal.h"
	#include "decode.h"
	#include "get_bits.h"
	#include "nellymoser.h"
	#include "sinewin.h"


	typedef struct NellyMoserDecodeContext {
	AVCodecContext* avctx;
	AVLFG random_state;
	GetBitContext gb;
	float scale_bias;
	AVFloatDSPContext *fdsp;
	AVTXContext *imdct_ctx;
	av_tx_fn imdct_fn;
	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_fn(s->imdct_ctx, s->imdct_out, aptr, sizeof(float));
	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)
	{
	int ret;
	float scale = 1.0f;
	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);
	if ((ret = av_tx_init(&s->imdct_ctx, &s->imdct_fn, AV_TX_FLOAT_MDCT,
	1, 128, &scale, 0)) < 0)
	return ret;

	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;

	av_channel_layout_uninit(&avctx->ch_layout);
	avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;

	/* Generate overlap window */
	ff_init_ff_sine_windows(7);

	return 0;
	}

	static int decode_tag(AVCodecContext avctx, AVFrame frame,
	int got_frame_ptr, AVPacket avpkt)
	{
	const uint8_t *buf = avpkt->data;
	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);
	}

	/* 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;

	av_tx_uninit(&s->imdct_ctx);
	av_freep(&s->fdsp);

	return 0;
	}

	const FFCodec ff_nellymoser_decoder = {
	.p.name = "nellymoser",
	CODEC_LONG_NAME("Nellymoser Asao"),
	.p.type = AVMEDIA_TYPE_AUDIO,
	.p.id = AV_CODEC_ID_NELLYMOSER,
	.priv_data_size = sizeof(NellyMoserDecodeContext),
	.init = decode_init,
	.close = decode_end,
	FF_CODEC_DECODE_CB(decode_tag),
	.p.capabilities = AV_CODEC_CAP_DR1 \| AV_CODEC_CAP_PARAM_CHANGE \| AV_CODEC_CAP_CHANNEL_CONF,
	.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLT,
	AV_SAMPLE_FMT_NONE },
	};