/**
* @file libavcodec/atrac1.c
* Atrac 1 compatible decoder.
- * This decoder handles raw ATRAC1 data.
+ * This decoder handles raw ATRAC1 data and probably SDDS data.
*/
/* Many thanks to Tim Craig for all the help! */
#include "avcodec.h"
#include "get_bits.h"
#include "dsputil.h"
+#include "fft.h"
#include "atrac.h"
#include "atrac1data.h"
typedef struct {
int log2_block_count[AT1_QMF_BANDS]; ///< log2 number of blocks in a band
int num_bfus; ///< number of Block Floating Units
- int idwls[AT1_MAX_BFU]; ///< the word length indexes for each BFU
- int idsfs[AT1_MAX_BFU]; ///< the scalefactor indexes for each BFU
float* spectrum[2];
- DECLARE_ALIGNED_16(float,spec1[AT1_SU_SAMPLES]); ///< mdct buffer
- DECLARE_ALIGNED_16(float,spec2[AT1_SU_SAMPLES]); ///< mdct buffer
- DECLARE_ALIGNED_16(float,fst_qmf_delay[46]); ///< delay line for the 1st stacked QMF filter
- DECLARE_ALIGNED_16(float,snd_qmf_delay[46]); ///< delay line for the 2nd stacked QMF filter
- DECLARE_ALIGNED_16(float,last_qmf_delay[256+23]); ///< delay line for the last stacked QMF filter
+ DECLARE_ALIGNED(16, float, spec1)[AT1_SU_SAMPLES]; ///< mdct buffer
+ DECLARE_ALIGNED(16, float, spec2)[AT1_SU_SAMPLES]; ///< mdct buffer
+ DECLARE_ALIGNED(16, float, fst_qmf_delay)[46]; ///< delay line for the 1st stacked QMF filter
+ DECLARE_ALIGNED(16, float, snd_qmf_delay)[46]; ///< delay line for the 2nd stacked QMF filter
+ DECLARE_ALIGNED(16, float, last_qmf_delay)[256+23]; ///< delay line for the last stacked QMF filter
} AT1SUCtx;
/**
*/
typedef struct {
AT1SUCtx SUs[AT1_MAX_CHANNELS]; ///< channel sound unit
- DECLARE_ALIGNED_16(float,spec[AT1_SU_SAMPLES]); ///< the mdct spectrum buffer
- DECLARE_ALIGNED_16(float,short_buf[64]); ///< buffer for the short mode
- DECLARE_ALIGNED_16(float, low[256]);
- DECLARE_ALIGNED_16(float, mid[256]);
- DECLARE_ALIGNED_16(float,high[512]);
+ DECLARE_ALIGNED(16, float, spec)[AT1_SU_SAMPLES]; ///< the mdct spectrum buffer
+
+ DECLARE_ALIGNED(16, float, low)[256];
+ DECLARE_ALIGNED(16, float, mid)[256];
+ DECLARE_ALIGNED(16, float, high)[512];
float* bands[3];
- float out_samples[AT1_MAX_CHANNELS][AT1_SU_SAMPLES];
- MDCTContext mdct_ctx[3];
+ DECLARE_ALIGNED(16, float, out_samples)[AT1_MAX_CHANNELS][AT1_SU_SAMPLES];
+ FFTContext mdct_ctx[3];
int channels;
DSPContext dsp;
} AT1Ctx;
-static float *short_window;
-static float *mid_window;
-DECLARE_ALIGNED_16(static float, long_window[256]);
-static float *window_per_band[3];
-
/** size of the transform in samples in the long mode for each QMF band */
static const uint16_t samples_per_band[3] = {128, 128, 256};
static const uint8_t mdct_long_nbits[3] = {7, 7, 8};
-static void at1_imdct(AT1Ctx *q, float *spec, float *out, int nbits, int rev_spec)
+static void at1_imdct(AT1Ctx *q, float *spec, float *out, int nbits,
+ int rev_spec)
{
- MDCTContext* mdct_context;
+ FFTContext* mdct_context = &q->mdct_ctx[nbits - 5 - (nbits > 6)];
int transf_size = 1 << nbits;
- mdct_context = &q->mdct_ctx[nbits - 5 - (nbits>6)];
-
if (rev_spec) {
int i;
- for (i=0 ; i<transf_size/2 ; i++)
- FFSWAP(float, spec[i], spec[transf_size-1-i]);
+ for (i = 0; i < transf_size / 2; i++)
+ FFSWAP(float, spec[i], spec[transf_size - 1 - i]);
}
- ff_imdct_half(mdct_context,out,spec);
+ ff_imdct_half(mdct_context, out, spec);
}
static int at1_imdct_block(AT1SUCtx* su, AT1Ctx *q)
{
- int band_num, band_samples, log2_block_count, nbits, num_blocks, block_size;
- unsigned int start_pos, ref_pos=0, pos = 0;
+ int band_num, band_samples, log2_block_count, nbits, num_blocks, block_size;
+ unsigned int start_pos, ref_pos = 0, pos = 0;
+
+ for (band_num = 0; band_num < AT1_QMF_BANDS; band_num++) {
+ float *prev_buf;
+ int j;
- for (band_num=0 ; band_num<AT1_QMF_BANDS ; band_num++) {
band_samples = samples_per_band[band_num];
log2_block_count = su->log2_block_count[band_num];
/* 4 for short mode(low/middle bands) and 8 for short mode(high band)*/
num_blocks = 1 << log2_block_count;
- /* mdct block size in samples: 128 (long mode, low & mid bands), */
- /* 256 (long mode, high band) and 32 (short mode, all bands) */
- block_size = band_samples >> log2_block_count;
-
- /* calc transform size in bits according to the block_size_mode */
- nbits = mdct_long_nbits[band_num] - log2_block_count;
+ if (num_blocks == 1) {
+ /* mdct block size in samples: 128 (long mode, low & mid bands), */
+ /* 256 (long mode, high band) and 32 (short mode, all bands) */
+ block_size = band_samples >> log2_block_count;
- if (nbits!=5 && nbits!=7 && nbits!=8)
- return -1;
+ /* calc transform size in bits according to the block_size_mode */
+ nbits = mdct_long_nbits[band_num] - log2_block_count;
- if (num_blocks == 1) {
- at1_imdct(q, &q->spec[pos], &su->spectrum[0][ref_pos], nbits, band_num);
- pos += block_size; // move to the next mdct block in the spectrum
+ if (nbits != 5 && nbits != 7 && nbits != 8)
+ return -1;
} else {
- /* calc start position for the 1st short block: 96(128) or 112(256) */
- start_pos = (band_samples * (num_blocks - 1)) >> (log2_block_count + 1);
- memset(&su->spectrum[0][ref_pos], 0, sizeof(float) * (band_samples * 2));
-
- for (; num_blocks!=0 ; num_blocks--) {
- /* use hardcoded nbits for the short mode */
- at1_imdct(q, &q->spec[pos], q->short_buf, 5, band_num);
-
- /* overlap and window between short blocks */
- q->dsp.vector_fmul_window(&su->spectrum[0][ref_pos+start_pos],
- &su->spectrum[0][ref_pos+start_pos],q->short_buf,short_window, 0, 16);
- start_pos += 32; // use hardcoded block_size
- pos += 32;
- }
+ block_size = 32;
+ nbits = 5;
+ }
+
+ start_pos = 0;
+ prev_buf = &su->spectrum[1][ref_pos + band_samples - 16];
+ for (j=0; j < num_blocks; j++) {
+ at1_imdct(q, &q->spec[pos], &su->spectrum[0][ref_pos + start_pos], nbits, band_num);
+
+ /* overlap and window */
+ q->dsp.vector_fmul_window(&q->bands[band_num][start_pos], prev_buf,
+ &su->spectrum[0][ref_pos + start_pos], ff_sine_32, 0, 16);
+
+ prev_buf = &su->spectrum[0][ref_pos+start_pos + 16];
+ start_pos += block_size;
+ pos += block_size;
}
- /* overlap and window with the previous frame and output the result */
- q->dsp.vector_fmul_window(q->bands[band_num], &su->spectrum[1][ref_pos+band_samples/2],
- &su->spectrum[0][ref_pos], window_per_band[band_num], 0, band_samples/2);
+ if (num_blocks == 1)
+ memcpy(q->bands[band_num] + 32, &su->spectrum[0][ref_pos + 16], 240 * sizeof(float));
ref_pos += band_samples;
}
return 0;
}
+/**
+ * Parse the block size mode byte
+ */
-static int at1_parse_block_size_mode(GetBitContext* gb, int log2_block_count[AT1_QMF_BANDS])
+static int at1_parse_bsm(GetBitContext* gb, int log2_block_cnt[AT1_QMF_BANDS])
{
int log2_block_count_tmp, i;
- for(i=0 ; i<2 ; i++) {
+ for (i = 0; i < 2; i++) {
/* low and mid band */
log2_block_count_tmp = get_bits(gb, 2);
if (log2_block_count_tmp & 1)
return -1;
- log2_block_count[i] = 2 - log2_block_count_tmp;
+ log2_block_cnt[i] = 2 - log2_block_count_tmp;
}
/* high band */
log2_block_count_tmp = get_bits(gb, 2);
if (log2_block_count_tmp != 0 && log2_block_count_tmp != 3)
return -1;
- log2_block_count[IDX_HIGH_BAND] = 3 - log2_block_count_tmp;
+ log2_block_cnt[IDX_HIGH_BAND] = 3 - log2_block_count_tmp;
skip_bits(gb, 2);
return 0;
}
-static int at1_unpack_dequant(GetBitContext* gb, AT1SUCtx* su, float spec[AT1_SU_SAMPLES])
+static int at1_unpack_dequant(GetBitContext* gb, AT1SUCtx* su,
+ float spec[AT1_SU_SAMPLES])
{
int bits_used, band_num, bfu_num, i;
+ uint8_t idwls[AT1_MAX_BFU]; ///< the word length indexes for each BFU
+ uint8_t idsfs[AT1_MAX_BFU]; ///< the scalefactor indexes for each BFU
/* parse the info byte (2nd byte) telling how much BFUs were coded */
su->num_bfus = bfu_amount_tab1[get_bits(gb, 3)];
(bfu_amount_tab3[get_bits(gb, 3)] << 1);
/* get word length index (idwl) for each BFU */
- for (i=0 ; i<su->num_bfus ; i++)
- su->idwls[i] = get_bits(gb, 4);
+ for (i = 0; i < su->num_bfus; i++)
+ idwls[i] = get_bits(gb, 4);
/* get scalefactor index (idsf) for each BFU */
- for (i=0 ; i<su->num_bfus ; i++)
- su->idsfs[i] = get_bits(gb, 6);
+ for (i = 0; i < su->num_bfus; i++)
+ idsfs[i] = get_bits(gb, 6);
/* zero idwl/idsf for empty BFUs */
for (i = su->num_bfus; i < AT1_MAX_BFU; i++)
- su->idwls[i] = su->idsfs[i] = 0;
+ idwls[i] = idsfs[i] = 0;
/* read in the spectral data and reconstruct MDCT spectrum of this channel */
- for (band_num=0 ; band_num<AT1_QMF_BANDS ; band_num++) {
- for (bfu_num=bfu_bands_t[band_num] ; bfu_num<bfu_bands_t[band_num+1] ; bfu_num++) {
+ for (band_num = 0; band_num < AT1_QMF_BANDS; band_num++) {
+ for (bfu_num = bfu_bands_t[band_num]; bfu_num < bfu_bands_t[band_num+1]; bfu_num++) {
int pos;
int num_specs = specs_per_bfu[bfu_num];
- int word_len = !!su->idwls[bfu_num] + su->idwls[bfu_num];
- float scale_factor = sf_table[su->idsfs[bfu_num]];
- bits_used += word_len * num_specs; /* add number of bits consumed by current BFU */
+ int word_len = !!idwls[bfu_num] + idwls[bfu_num];
+ float scale_factor = sf_table[idsfs[bfu_num]];
+ bits_used += word_len * num_specs; /* add number of bits consumed by current BFU */
/* check for bitstream overflow */
if (bits_used > AT1_SU_MAX_BITS)
pos = su->log2_block_count[band_num] ? bfu_start_short[bfu_num] : bfu_start_long[bfu_num];
if (word_len) {
- float max_quant = 1.0/(float)((1 << (word_len - 1)) - 1);
+ float max_quant = 1.0 / (float)((1 << (word_len - 1)) - 1);
- for (i=0 ; i<num_specs ; i++) {
+ for (i = 0; i < num_specs; i++) {
/* read in a quantized spec and convert it to
* signed int and then inverse quantization
*/
spec[pos+i] = get_sbits(gb, word_len) * scale_factor * max_quant;
}
} else { /* word_len = 0 -> empty BFU, zero all specs in the emty BFU */
- memset(&spec[pos], 0, num_specs*sizeof(float));
+ memset(&spec[pos], 0, num_specs * sizeof(float));
}
}
}
}
-void at1_subband_synthesis(AT1Ctx *q, AT1SUCtx* su, float *pOut)
+static void at1_subband_synthesis(AT1Ctx *q, AT1SUCtx* su, float *pOut)
{
- float temp[256];
- float iqmf_temp[512 + 46];
+ float temp[256];
+ float iqmf_temp[512 + 46];
/* combine low and middle bands */
atrac_iqmf(q->bands[0], q->bands[1], 128, temp, su->fst_qmf_delay, iqmf_temp);
/* delay the signal of the high band by 23 samples */
- memcpy( su->last_qmf_delay, &su->last_qmf_delay[256], sizeof(float)*23);
- memcpy(&su->last_qmf_delay[23], q->bands[2], sizeof(float)*256);
+ memcpy( su->last_qmf_delay, &su->last_qmf_delay[256], sizeof(float) * 23);
+ memcpy(&su->last_qmf_delay[23], q->bands[2], sizeof(float) * 256);
/* combine (low + middle) and high bands */
atrac_iqmf(temp, su->last_qmf_delay, 256, pOut, su->snd_qmf_delay, iqmf_temp);
}
-static int atrac1_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- AVPacket *avpkt)
+static int atrac1_decode_frame(AVCodecContext *avctx, void *data,
+ int *data_size, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
- AT1Ctx *q = avctx->priv_data;
+ int buf_size = avpkt->size;
+ AT1Ctx *q = avctx->priv_data;
int ch, ret, i;
GetBitContext gb;
float* samples = data;
return -1;
}
- for (ch=0 ; ch<q->channels ; ch++) {
+ for (ch = 0; ch < q->channels; ch++) {
AT1SUCtx* su = &q->SUs[ch];
- init_get_bits(&gb, &buf[212*ch], 212*8);
+ init_get_bits(&gb, &buf[212 * ch], 212 * 8);
/* parse block_size_mode, 1st byte */
- ret = at1_parse_block_size_mode(&gb, su->log2_block_count);
+ ret = at1_parse_bsm(&gb, su->log2_block_count);
if (ret < 0)
return ret;
/* round, convert to 16bit and interleave */
if (q->channels == 1) {
/* mono */
- q->dsp.vector_clipf(samples, q->out_samples[0], -32700./(1<<15), 32700./(1<<15), AT1_SU_SAMPLES);
+ q->dsp.vector_clipf(samples, q->out_samples[0], -32700.0 / (1 << 15),
+ 32700.0 / (1 << 15), AT1_SU_SAMPLES);
} else {
/* stereo */
for (i = 0; i < AT1_SU_SAMPLES; i++) {
- samples[i*2] = av_clipf(q->out_samples[0][i], -32700./(1<<15), 32700./(1<<15));
- samples[i*2+1] = av_clipf(q->out_samples[1][i], -32700./(1<<15), 32700./(1<<15));
+ samples[i * 2] = av_clipf(q->out_samples[0][i],
+ -32700.0 / (1 << 15),
+ 32700.0 / (1 << 15));
+ samples[i * 2 + 1] = av_clipf(q->out_samples[1][i],
+ -32700.0 / (1 << 15),
+ 32700.0 / (1 << 15));
}
}
}
-static av_cold void init_mdct_windows(void)
-{
- int i;
-
- /** The mid and long windows uses the same sine window splitted
- * in the middle and wrapped into zero/one regions as follows:
- *
- * region of "ones"
- * -------------
- * /
- * / 1st half
- * / of the sine
- * / window
- * ---------/
- * zero region
- *
- * The mid and short windows are subsets of the long window.
- */
-
- /* Build "zero" region */
- memset(long_window, 0, sizeof(long_window));
- /* Build sine window region */
- short_window = &long_window[112];
- ff_sine_window_init(short_window,32);
- /* Build "ones" region */
- for (i = 0; i < 112; i++)
- long_window[144 + i] = 1.0f;
- /* Save the mid window subset start */
- mid_window = &long_window[64];
-
- /* Prepare the window table */
- window_per_band[0] = mid_window;
- window_per_band[1] = mid_window;
- window_per_band[2] = long_window;
-}
-
static av_cold int atrac1_decode_init(AVCodecContext *avctx)
{
AT1Ctx *q = avctx->priv_data;
q->channels = avctx->channels;
/* Init the mdct transforms */
- ff_mdct_init(&q->mdct_ctx[0], 6, 1, -1.0/ (1<<15));
- ff_mdct_init(&q->mdct_ctx[1], 8, 1, -1.0/ (1<<15));
- ff_mdct_init(&q->mdct_ctx[2], 9, 1, -1.0/ (1<<15));
- init_mdct_windows();
+ ff_mdct_init(&q->mdct_ctx[0], 6, 1, -1.0/ (1 << 15));
+ ff_mdct_init(&q->mdct_ctx[1], 8, 1, -1.0/ (1 << 15));
+ ff_mdct_init(&q->mdct_ctx[2], 9, 1, -1.0/ (1 << 15));
+
+ ff_init_ff_sine_windows(5);
atrac_generate_tables();
return 0;
}
+
+static av_cold int atrac1_decode_end(AVCodecContext * avctx) {
+ AT1Ctx *q = avctx->priv_data;
+
+ ff_mdct_end(&q->mdct_ctx[0]);
+ ff_mdct_end(&q->mdct_ctx[1]);
+ ff_mdct_end(&q->mdct_ctx[2]);
+ return 0;
+}
+
+
AVCodec atrac1_decoder = {
.name = "atrac1",
- .type = CODEC_TYPE_AUDIO,
+ .type = AVMEDIA_TYPE_AUDIO,
.id = CODEC_ID_ATRAC1,
.priv_data_size = sizeof(AT1Ctx),
.init = atrac1_decode_init,
- .close = NULL,
+ .close = atrac1_decode_end,
.decode = atrac1_decode_frame,
.long_name = NULL_IF_CONFIG_SMALL("Atrac 1 (Adaptive TRansform Acoustic Coding)"),
};
projects / ffmpeg / blobdiff