/*
- * Atrac 3 compatible decoder
+ * ATRAC3 compatible decoder
* Copyright (c) 2006-2008 Maxim Poliakovski
* Copyright (c) 2006-2008 Benjamin Larsson
*
/**
* @file
- * Atrac 3 compatible decoder.
+ * ATRAC3 compatible decoder.
* This decoder handles Sony's ATRAC3 data.
*
- * Container formats used to store atrac 3 data:
+ * Container formats used to store ATRAC3 data:
* RealMedia (.rm), RIFF WAV (.wav, .at3), Sony OpenMG (.oma, .aa3).
*
* To use this decoder, a calling application must supply the extradata
#include <stddef.h>
#include <stdio.h>
+#include "libavutil/attributes.h"
#include "libavutil/float_dsp.h"
#include "avcodec.h"
#include "bytestream.h"
#include "fft.h"
-#include "fmtconvert.h"
#include "get_bits.h"
#include "internal.h"
#define SAMPLES_PER_FRAME 1024
#define MDCT_SIZE 512
-typedef struct GainInfo {
- int num_gain_data;
- int lev_code[8];
- int loc_code[8];
-} GainInfo;
-
typedef struct GainBlock {
- GainInfo g_block[4];
+ AtracGainInfo g_block[4];
} GainBlock;
typedef struct TonalComponent {
int scrambled_stream;
//@}
+ AtracGCContext gainc_ctx;
FFTContext mdct_ctx;
- FmtConvertContext fmt_conv;
AVFloatDSPContext fdsp;
} ATRAC3Context;
static DECLARE_ALIGNED(32, float, mdct_window)[MDCT_SIZE];
static VLC_TYPE atrac3_vlc_table[4096][2];
static VLC spectral_coeff_tab[7];
-static float gain_tab1[16];
-static float gain_tab2[31];
-
-/*
+/**
* Regular 512 points IMDCT without overlapping, with the exception of the
* swapping of odd bands caused by the reverse spectra of the QMF.
*
off = (intptr_t)input & 3;
buf = (const uint32_t *)(input - off);
- c = av_be2ne32((0x537F6103 >> (off * 8)) | (0x537F6103 << (32 - (off * 8))));
+ if (off)
+ c = av_be2ne32((0x537F6103U >> (off * 8)) | (0x537F6103U << (32 - (off * 8))));
+ else
+ c = av_be2ne32(0x537F6103U);
bytes += 3 + off;
for (i = 0; i < bytes / 4; i++)
output[i] = c ^ buf[i];
return off;
}
-static av_cold void init_atrac3_window(void)
+static av_cold void init_imdct_window(void)
{
int i, j;
return 0;
}
-/*
+/**
* Mantissa decoding
*
* @param selector which table the output values are coded with
}
}
-/*
+/**
* Restore the quantized band spectrum coefficients
*
* @return subband count, fix for broken specification/files
return num_subbands;
}
-/*
+/**
* Restore the quantized tonal components
*
* @param components tonal components
return component_count;
}
-/*
+/**
* Decode gain parameters for the coded bands
*
* @param block the gainblock for the current band
static int decode_gain_control(GetBitContext *gb, GainBlock *block,
int num_bands)
{
- int i, cf, num_data;
+ int i, j;
int *level, *loc;
- GainInfo *gain = block->g_block;
+ AtracGainInfo *gain = block->g_block;
for (i = 0; i <= num_bands; i++) {
- num_data = get_bits(gb, 3);
- gain[i].num_gain_data = num_data;
+ gain[i].num_points = get_bits(gb, 3);
level = gain[i].lev_code;
loc = gain[i].loc_code;
- for (cf = 0; cf < gain[i].num_gain_data; cf++) {
- level[cf] = get_bits(gb, 4);
- loc [cf] = get_bits(gb, 5);
- if (cf && loc[cf] <= loc[cf - 1])
+ for (j = 0; j < gain[i].num_points; j++) {
+ level[j] = get_bits(gb, 4);
+ loc[j] = get_bits(gb, 5);
+ if (j && loc[j] <= loc[j - 1])
return AVERROR_INVALIDDATA;
}
}
/* Clear the unused blocks. */
for (; i < 4 ; i++)
- gain[i].num_gain_data = 0;
+ gain[i].num_points = 0;
return 0;
}
-/*
- * Apply gain parameters and perform the MDCT overlapping part
- *
- * @param input input buffer
- * @param prev previous buffer to perform overlap against
- * @param output output buffer
- * @param gain1 current band gain info
- * @param gain2 next band gain info
- */
-static void gain_compensate_and_overlap(float *input, float *prev,
- float *output, GainInfo *gain1,
- GainInfo *gain2)
-{
- float g1, g2, gain_inc;
- int i, j, num_data, start_loc, end_loc;
-
-
- if (gain2->num_gain_data == 0)
- g1 = 1.0;
- else
- g1 = gain_tab1[gain2->lev_code[0]];
-
- if (gain1->num_gain_data == 0) {
- for (i = 0; i < 256; i++)
- output[i] = input[i] * g1 + prev[i];
- } else {
- num_data = gain1->num_gain_data;
- gain1->loc_code[num_data] = 32;
- gain1->lev_code[num_data] = 4;
-
- for (i = 0, j = 0; i < num_data; i++) {
- start_loc = gain1->loc_code[i] * 8;
- end_loc = start_loc + 8;
-
- g2 = gain_tab1[gain1->lev_code[i]];
- gain_inc = gain_tab2[gain1->lev_code[i + 1] -
- gain1->lev_code[i ] + 15];
-
- /* interpolate */
- for (; j < start_loc; j++)
- output[j] = (input[j] * g1 + prev[j]) * g2;
-
- /* interpolation is done over eight samples */
- for (; j < end_loc; j++) {
- output[j] = (input[j] * g1 + prev[j]) * g2;
- g2 *= gain_inc;
- }
- }
-
- for (; j < 256; j++)
- output[j] = input[j] * g1 + prev[j];
- }
-
- /* Delay for the overlapping part. */
- memcpy(prev, &input[256], 256 * sizeof(*prev));
-}
-
-/*
+/**
* Combine the tonal band spectrum and regular band spectrum
*
* @param spectrum output spectrum buffer
}
}
-/*
+/**
* Decode a Sound Unit
*
* @param snd the channel unit to be used
snd->num_components = decode_tonal_components(gb, snd->components,
snd->bands_coded);
- if (snd->num_components == -1)
- return -1;
+ if (snd->num_components < 0)
+ return snd->num_components;
num_subbands = decode_spectrum(gb, snd->spectrum);
memset(snd->imdct_buf, 0, 512 * sizeof(*snd->imdct_buf));
/* gain compensation and overlapping */
- gain_compensate_and_overlap(snd->imdct_buf,
- &snd->prev_frame[band * 256],
- &output[band * 256],
- &gain1->g_block[band],
- &gain2->g_block[band]);
+ ff_atrac_gain_compensation(&q->gainc_ctx, snd->imdct_buf,
+ &snd->prev_frame[band * 256],
+ &gain1->g_block[band], &gain2->g_block[band],
+ 256, &output[band * 256]);
}
/* Swap the gain control buffers for the next frame. */
/* set the bitstream reader at the start of the second Sound Unit*/
- init_get_bits(&q->gb, ptr1, avctx->block_align * 8);
+ init_get_bits(&q->gb, ptr1, (avctx->block_align - i) * 8);
/* Fill the Weighting coeffs delay buffer */
memmove(q->weighting_delay, &q->weighting_delay[2],
return avctx->block_align;
}
-static void atrac3_init_static_data(AVCodec *codec)
+static av_cold void atrac3_init_static_data(AVCodec *codec)
{
int i;
- init_atrac3_window();
+ init_imdct_window();
ff_atrac_generate_tables();
/* Initialize the VLC tables. */
huff_bits[i], 1, 1,
huff_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
}
-
- /* Generate gain tables */
- for (i = 0; i < 16; i++)
- gain_tab1[i] = powf(2.0, (4 - i));
-
- for (i = -15; i < 16; i++)
- gain_tab2[i + 15] = powf(2.0, i * -0.125);
}
static av_cold int atrac3_decode_init(AVCodecContext *avctx)
if (q->coding_mode == STEREO)
av_log(avctx, AV_LOG_DEBUG, "Normal stereo detected.\n");
- else if (q->coding_mode == JOINT_STEREO)
+ else if (q->coding_mode == JOINT_STEREO) {
+ if (avctx->channels != 2)
+ return AVERROR_INVALIDDATA;
av_log(avctx, AV_LOG_DEBUG, "Joint stereo detected.\n");
- else {
+ } else {
av_log(avctx, AV_LOG_ERROR, "Unknown channel coding mode %x!\n",
q->coding_mode);
return AVERROR_INVALIDDATA;
return AVERROR(EINVAL);
q->decoded_bytes_buffer = av_mallocz(FFALIGN(avctx->block_align, 4) +
- FF_INPUT_BUFFER_PADDING_SIZE);
- if (q->decoded_bytes_buffer == NULL)
+ AV_INPUT_BUFFER_PADDING_SIZE);
+ if (!q->decoded_bytes_buffer)
return AVERROR(ENOMEM);
avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
q->matrix_coeff_index_next[i] = 3;
}
- avpriv_float_dsp_init(&q->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);
- ff_fmt_convert_init(&q->fmt_conv, avctx);
+ ff_atrac_init_gain_compensation(&q->gainc_ctx, 4, 3);
+ avpriv_float_dsp_init(&q->fdsp, avctx->flags & AV_CODEC_FLAG_BITEXACT);
q->units = av_mallocz(sizeof(*q->units) * avctx->channels);
if (!q->units) {
AVCodec ff_atrac3_decoder = {
.name = "atrac3",
+ .long_name = NULL_IF_CONFIG_SMALL("ATRAC3 (Adaptive TRansform Acoustic Coding 3)"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_ATRAC3,
.priv_data_size = sizeof(ATRAC3Context),
.init_static_data = atrac3_init_static_data,
.close = atrac3_decode_close,
.decode = atrac3_decode_frame,
- .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
- .long_name = NULL_IF_CONFIG_SMALL("Atrac 3 (Adaptive TRansform Acoustic Coding 3)"),
+ .capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
AV_SAMPLE_FMT_NONE },
};
projects / ffmpeg / blobdiff