/**
* @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! */
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[512]); ///< buffer for the short mode
+ 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]);
+ 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;
-DECLARE_ALIGNED_16(static float, short_window[32]);
-
/** 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)
{
- 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++)
+ for (i = 0; i < transf_size / 2; i++)
FFSWAP(float, spec[i], spec[transf_size - 1 - i]);
}
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;
+ 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;
- /* calc transform size in bits according to the block_size_mode */
- nbits = mdct_long_nbits[band_num] - log2_block_count;
+ /* calc transform size in bits according to the block_size_mode */
+ nbits = mdct_long_nbits[band_num] - log2_block_count;
- if (nbits!=5 && nbits!=7 && nbits!=8)
- return -1;
+ if (nbits != 5 && nbits != 7 && nbits != 8)
+ return -1;
+ } else {
+ block_size = 32;
+ nbits = 5;
+ }
- 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
+ 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 long blocks */
- q->dsp.vector_fmul_window(q->bands[band_num], &su->spectrum[1][ref_pos+band_samples-16],
- &su->spectrum[0][ref_pos], short_window, 0, 16);
- memcpy(q->bands[band_num]+32, &su->spectrum[0][ref_pos+16], 240 * sizeof(float));
+ /* 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);
- } else {
- /* calc start position for the 1st short block: 96(128) or 112(256) */
- int short_pos = 32;
- float *prev_buf;
- start_pos = (band_samples * (num_blocks - 1)) >> (log2_block_count + 1);
- memset(&su->spectrum[0][ref_pos], 0, sizeof(float) * (band_samples * 2));
-
- prev_buf = &su->spectrum[1][ref_pos+band_samples-16];
- for (; num_blocks!=0 ; num_blocks--) {
- /* use hardcoded nbits for the short mode */
- at1_imdct(q, &q->spec[pos], &q->short_buf[short_pos], 5, band_num);
-
- /* overlap and window between short blocks */
- q->dsp.vector_fmul_window(&su->spectrum[0][ref_pos+start_pos],
- &q->short_buf[short_pos-16],
- &q->short_buf[short_pos],short_window, 0, 16);
-
- prev_buf = &q->short_buf[short_pos+16];
-
- start_pos += 32; // use hardcoded block_size
- pos += 32;
- short_pos +=32;
- }
- memcpy(q->bands[band_num], &su->spectrum[0][ref_pos], band_samples*sizeof(float));
+ prev_buf = &su->spectrum[0][ref_pos+start_pos + 16];
+ start_pos += block_size;
+ pos += block_size;
}
+
+ if (num_blocks == 1)
+ memcpy(q->bands[band_num] + 32, &su->spectrum[0][ref_pos + 16], 240 * sizeof(float));
+
ref_pos += band_samples;
}
{
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)
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)
if (word_len) {
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)
{
- 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);
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_bsm(&gb, su->log2_block_count);
/* round, convert to 16bit and interleave */
if (q->channels == 1) {
/* mono */
- q->dsp.vector_clipf(samples, q->out_samples[0], -32700.0 / (1<<15),
- 32700.0 / (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], -32700.0 / (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));
+ 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));
}
}
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));
+ 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_sine_window_init(short_window, 32);
+ ff_sine_window_init(ff_sine_32, 32);
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,
.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