/*
* WMA compatible codec
- * Copyright (c) 2002-2007 The FFmpeg Project.
+ * Copyright (c) 2002-2007 The Libav Project
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include "libavutil/attributes.h"
#include "avcodec.h"
+#include "sinewin.h"
#include "wma.h"
+#include "wma_common.h"
#include "wmadata.h"
#undef NDEBUG
/* XXX: use same run/length optimization as mpeg decoders */
//FIXME maybe split decode / encode or pass flag
-static void init_coef_vlc(VLC *vlc,
- uint16_t **prun_table, uint16_t **plevel_table, uint16_t **pint_table,
- const CoefVLCTable *vlc_table)
+static av_cold void init_coef_vlc(VLC *vlc, uint16_t **prun_table,
+ float **plevel_table, uint16_t **pint_table,
+ const CoefVLCTable *vlc_table)
{
int n = vlc_table->n;
- const uint8_t *table_bits = vlc_table->huffbits;
- const uint32_t *table_codes = vlc_table->huffcodes;
+ const uint8_t *table_bits = vlc_table->huffbits;
+ const uint32_t *table_codes = vlc_table->huffcodes;
const uint16_t *levels_table = vlc_table->levels;
uint16_t *run_table, *level_table, *int_table;
+ float *flevel_table;
int i, l, j, k, level;
init_vlc(vlc, VLCBITS, n, table_bits, 1, 1, table_codes, 4, 4, 0);
- run_table = av_malloc(n * sizeof(uint16_t));
+ run_table = av_malloc(n * sizeof(uint16_t));
level_table = av_malloc(n * sizeof(uint16_t));
- int_table = av_malloc(n * sizeof(uint16_t));
+ flevel_table= av_malloc(n * sizeof(*flevel_table));
+ int_table = av_malloc(n * sizeof(uint16_t));
i = 2;
level = 1;
k = 0;
while (i < n) {
- int_table[k]= i;
+ int_table[k] = i;
l = levels_table[k++];
- for(j=0;j<l;j++) {
- run_table[i] = j;
+ for (j = 0; j < l; j++) {
+ run_table[i] = j;
level_table[i] = level;
+ flevel_table[i]= level;
i++;
}
level++;
}
- *prun_table = run_table;
- *plevel_table = level_table;
- *pint_table= int_table;
+ *prun_table = run_table;
+ *plevel_table = flevel_table;
+ *pint_table = int_table;
+ av_free(level_table);
}
-int ff_wma_init(AVCodecContext * avctx, int flags2)
+av_cold int ff_wma_init(AVCodecContext *avctx, int flags2)
{
WMACodecContext *s = avctx->priv_data;
int i;
- float *window;
float bps1, high_freq;
volatile float bps;
int sample_rate1;
int coef_vlc_table;
- if( avctx->sample_rate<=0 || avctx->sample_rate>50000
- || avctx->channels<=0 || avctx->channels>8
- || avctx->bit_rate<=0)
+ if ( avctx->sample_rate <= 0 || avctx->sample_rate > 50000
+ || avctx->channels <= 0 || avctx->channels > 2
+ || avctx->bit_rate <= 0)
return -1;
- s->sample_rate = avctx->sample_rate;
- s->nb_channels = avctx->channels;
- s->bit_rate = avctx->bit_rate;
- s->block_align = avctx->block_align;
+ ff_fmt_convert_init(&s->fmt_conv, avctx);
+ avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);
- dsputil_init(&s->dsp, avctx);
-
- if (avctx->codec->id == CODEC_ID_WMAV1) {
+ if (avctx->codec->id == AV_CODEC_ID_WMAV1) {
s->version = 1;
} else {
s->version = 2;
}
/* compute MDCT block size */
- if (s->sample_rate <= 16000) {
- s->frame_len_bits = 9;
- } else if (s->sample_rate <= 22050 ||
- (s->sample_rate <= 32000 && s->version == 1)) {
- s->frame_len_bits = 10;
- } else {
- s->frame_len_bits = 11;
- }
+ s->frame_len_bits = ff_wma_get_frame_len_bits(avctx->sample_rate,
+ s->version, 0);
+ s->next_block_len_bits = s->frame_len_bits;
+ s->prev_block_len_bits = s->frame_len_bits;
+ s->block_len_bits = s->frame_len_bits;
+
s->frame_len = 1 << s->frame_len_bits;
if (s->use_variable_block_len) {
int nb_max, nb;
nb = ((flags2 >> 3) & 3) + 1;
- if ((s->bit_rate / s->nb_channels) >= 32000)
+ if ((avctx->bit_rate / avctx->channels) >= 32000)
nb += 2;
nb_max = s->frame_len_bits - BLOCK_MIN_BITS;
if (nb > nb_max)
/* init rate dependent parameters */
s->use_noise_coding = 1;
- high_freq = s->sample_rate * 0.5;
+ high_freq = avctx->sample_rate * 0.5;
/* if version 2, then the rates are normalized */
- sample_rate1 = s->sample_rate;
+ sample_rate1 = avctx->sample_rate;
if (s->version == 2) {
- if (sample_rate1 >= 44100)
+ if (sample_rate1 >= 44100) {
sample_rate1 = 44100;
- else if (sample_rate1 >= 22050)
+ } else if (sample_rate1 >= 22050) {
sample_rate1 = 22050;
- else if (sample_rate1 >= 16000)
+ } else if (sample_rate1 >= 16000) {
sample_rate1 = 16000;
- else if (sample_rate1 >= 11025)
+ } else if (sample_rate1 >= 11025) {
sample_rate1 = 11025;
- else if (sample_rate1 >= 8000)
+ } else if (sample_rate1 >= 8000) {
sample_rate1 = 8000;
+ }
}
- bps = (float)s->bit_rate / (float)(s->nb_channels * s->sample_rate);
+ bps = (float)avctx->bit_rate / (float)(avctx->channels * avctx->sample_rate);
s->byte_offset_bits = av_log2((int)(bps * s->frame_len / 8.0 + 0.5)) + 2;
/* compute high frequency value and choose if noise coding should
be activated */
bps1 = bps;
- if (s->nb_channels == 2)
+ if (avctx->channels == 2)
bps1 = bps * 1.6;
if (sample_rate1 == 44100) {
- if (bps1 >= 0.61)
+ if (bps1 >= 0.61) {
s->use_noise_coding = 0;
- else
+ } else {
high_freq = high_freq * 0.4;
+ }
} else if (sample_rate1 == 22050) {
- if (bps1 >= 1.16)
+ if (bps1 >= 1.16) {
s->use_noise_coding = 0;
- else if (bps1 >= 0.72)
+ } else if (bps1 >= 0.72) {
high_freq = high_freq * 0.7;
- else
+ } else {
high_freq = high_freq * 0.6;
+ }
} else if (sample_rate1 == 16000) {
- if (bps > 0.5)
+ if (bps > 0.5) {
high_freq = high_freq * 0.5;
- else
+ } else {
high_freq = high_freq * 0.3;
+ }
} else if (sample_rate1 == 11025) {
high_freq = high_freq * 0.7;
} else if (sample_rate1 == 8000) {
high_freq = high_freq * 0.5;
}
}
- dprintf(s->avctx, "flags2=0x%x\n", flags2);
- dprintf(s->avctx, "version=%d channels=%d sample_rate=%d bitrate=%d block_align=%d\n",
- s->version, s->nb_channels, s->sample_rate, s->bit_rate,
- s->block_align);
- dprintf(s->avctx, "bps=%f bps1=%f high_freq=%f bitoffset=%d\n",
- bps, bps1, high_freq, s->byte_offset_bits);
- dprintf(s->avctx, "use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
- s->use_noise_coding, s->use_exp_vlc, s->nb_block_sizes);
+ av_dlog(s->avctx, "flags2=0x%x\n", flags2);
+ av_dlog(s->avctx, "version=%d channels=%d sample_rate=%d bitrate=%d block_align=%d\n",
+ s->version, avctx->channels, avctx->sample_rate, avctx->bit_rate,
+ avctx->block_align);
+ av_dlog(s->avctx, "bps=%f bps1=%f high_freq=%f bitoffset=%d\n",
+ bps, bps1, high_freq, s->byte_offset_bits);
+ av_dlog(s->avctx, "use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
+ s->use_noise_coding, s->use_exp_vlc, s->nb_block_sizes);
/* compute the scale factor band sizes for each MDCT block size */
{
} else {
s->coefs_start = 0;
}
- for(k = 0; k < s->nb_block_sizes; k++) {
+ for (k = 0; k < s->nb_block_sizes; k++) {
block_len = s->frame_len >> k;
if (s->version == 1) {
lpos = 0;
- for(i=0;i<25;i++) {
- a = wma_critical_freqs[i];
- b = s->sample_rate;
- pos = ((block_len * 2 * a) + (b >> 1)) / b;
+ for (i = 0; i < 25; i++) {
+ a = ff_wma_critical_freqs[i];
+ b = avctx->sample_rate;
+ pos = ((block_len * 2 * a) + (b >> 1)) / b;
if (pos > block_len)
pos = block_len;
s->exponent_bands[0][i] = pos - lpos;
table = NULL;
a = s->frame_len_bits - BLOCK_MIN_BITS - k;
if (a < 3) {
- if (s->sample_rate >= 44100)
+ if (avctx->sample_rate >= 44100) {
table = exponent_band_44100[a];
- else if (s->sample_rate >= 32000)
+ } else if (avctx->sample_rate >= 32000) {
table = exponent_band_32000[a];
- else if (s->sample_rate >= 22050)
+ } else if (avctx->sample_rate >= 22050) {
table = exponent_band_22050[a];
+ }
}
if (table) {
n = *table++;
- for(i=0;i<n;i++)
+ for (i = 0; i < n; i++)
s->exponent_bands[k][i] = table[i];
s->exponent_sizes[k] = n;
} else {
j = 0;
lpos = 0;
- for(i=0;i<25;i++) {
- a = wma_critical_freqs[i];
- b = s->sample_rate;
- pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
+ for (i = 0; i < 25; i++) {
+ a = ff_wma_critical_freqs[i];
+ b = avctx->sample_rate;
+ pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
pos <<= 2;
if (pos > block_len)
pos = block_len;
s->coefs_end[k] = (s->frame_len - ((s->frame_len * 9) / 100)) >> k;
/* high freq computation */
s->high_band_start[k] = (int)((block_len * 2 * high_freq) /
- s->sample_rate + 0.5);
+ avctx->sample_rate + 0.5);
n = s->exponent_sizes[k];
j = 0;
pos = 0;
- for(i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
int start, end;
start = pos;
pos += s->exponent_bands[k][i];
s->exponent_high_sizes[k] = j;
#if 0
tprintf(s->avctx, "%5d: coefs_end=%d high_band_start=%d nb_high_bands=%d: ",
- s->frame_len >> k,
- s->coefs_end[k],
- s->high_band_start[k],
- s->exponent_high_sizes[k]);
- for(j=0;j<s->exponent_high_sizes[k];j++)
+ s->frame_len >> k,
+ s->coefs_end[k],
+ s->high_band_start[k],
+ s->exponent_high_sizes[k]);
+ for (j = 0; j < s->exponent_high_sizes[k]; j++)
tprintf(s->avctx, " %d", s->exponent_high_bands[k][j]);
tprintf(s->avctx, "\n");
#endif
#ifdef TRACE
{
int i, j;
- for(i = 0; i < s->nb_block_sizes; i++) {
+ for (i = 0; i < s->nb_block_sizes; i++) {
tprintf(s->avctx, "%5d: n=%2d:",
- s->frame_len >> i,
- s->exponent_sizes[i]);
- for(j=0;j<s->exponent_sizes[i];j++)
+ s->frame_len >> i,
+ s->exponent_sizes[i]);
+ for (j = 0; j < s->exponent_sizes[i]; j++)
tprintf(s->avctx, " %d", s->exponent_bands[i][j]);
tprintf(s->avctx, "\n");
}
#endif
/* init MDCT windows : simple sinus window */
- for(i = 0; i < s->nb_block_sizes; i++) {
- int n, j;
- float alpha;
- n = 1 << (s->frame_len_bits - i);
- window = av_malloc(sizeof(float) * n);
- alpha = M_PI / (2.0 * n);
- for(j=0;j<n;j++) {
- window[j] = sin((j + 0.5) * alpha);
- }
- s->windows[i] = window;
+ for (i = 0; i < s->nb_block_sizes; i++) {
+ ff_init_ff_sine_windows(s->frame_len_bits - i);
+ s->windows[i] = ff_sine_windows[s->frame_len_bits - i];
}
s->reset_block_lengths = 1;
if (s->use_noise_coding) {
/* init the noise generator */
- if (s->use_exp_vlc)
+ if (s->use_exp_vlc) {
s->noise_mult = 0.02;
- else
+ } else {
s->noise_mult = 0.04;
+ }
#ifdef TRACE
- for(i=0;i<NOISE_TAB_SIZE;i++)
+ for (i = 0; i < NOISE_TAB_SIZE; i++)
s->noise_table[i] = 1.0 * s->noise_mult;
#else
{
float norm;
seed = 1;
norm = (1.0 / (float)(1LL << 31)) * sqrt(3) * s->noise_mult;
- for(i=0;i<NOISE_TAB_SIZE;i++) {
+ for (i = 0; i < NOISE_TAB_SIZE; i++) {
seed = seed * 314159 + 1;
s->noise_table[i] = (float)((int)seed) * norm;
}
/* choose the VLC tables for the coefficients */
coef_vlc_table = 2;
- if (s->sample_rate >= 32000) {
- if (bps1 < 0.72)
+ if (avctx->sample_rate >= 32000) {
+ if (bps1 < 0.72) {
coef_vlc_table = 0;
- else if (bps1 < 1.16)
+ } else if (bps1 < 1.16) {
coef_vlc_table = 1;
+ }
}
s->coef_vlcs[0]= &coef_vlcs[coef_vlc_table * 2 ];
s->coef_vlcs[1]= &coef_vlcs[coef_vlc_table * 2 + 1];
return 0;
}
-int ff_wma_total_gain_to_bits(int total_gain){
+int ff_wma_total_gain_to_bits(int total_gain)
+{
if (total_gain < 15) return 13;
else if (total_gain < 32) return 12;
else if (total_gain < 40) return 11;
WMACodecContext *s = avctx->priv_data;
int i;
- for(i = 0; i < s->nb_block_sizes; i++)
+ for (i = 0; i < s->nb_block_sizes; i++)
ff_mdct_end(&s->mdct_ctx[i]);
- for(i = 0; i < s->nb_block_sizes; i++)
- av_free(s->windows[i]);
if (s->use_exp_vlc) {
- free_vlc(&s->exp_vlc);
+ ff_free_vlc(&s->exp_vlc);
}
if (s->use_noise_coding) {
- free_vlc(&s->hgain_vlc);
+ ff_free_vlc(&s->hgain_vlc);
}
- for(i = 0;i < 2; i++) {
- free_vlc(&s->coef_vlc[i]);
+ for (i = 0; i < 2; i++) {
+ ff_free_vlc(&s->coef_vlc[i]);
av_free(s->run_table[i]);
av_free(s->level_table[i]);
av_free(s->int_table[i]);
return 0;
}
+
+/**
+ * Decode an uncompressed coefficient.
+ * @param gb GetBitContext
+ * @return the decoded coefficient
+ */
+unsigned int ff_wma_get_large_val(GetBitContext* gb)
+{
+ /** consumes up to 34 bits */
+ int n_bits = 8;
+ /** decode length */
+ if (get_bits1(gb)) {
+ n_bits += 8;
+ if (get_bits1(gb)) {
+ n_bits += 8;
+ if (get_bits1(gb)) {
+ n_bits += 7;
+ }
+ }
+ }
+ return get_bits_long(gb, n_bits);
+}
+
+/**
+ * Decode run level compressed coefficients.
+ * @param avctx codec context
+ * @param gb bitstream reader context
+ * @param vlc vlc table for get_vlc2
+ * @param level_table level codes
+ * @param run_table run codes
+ * @param version 0 for wma1,2 1 for wmapro
+ * @param ptr output buffer
+ * @param offset offset in the output buffer
+ * @param num_coefs number of input coefficents
+ * @param block_len input buffer length (2^n)
+ * @param frame_len_bits number of bits for escaped run codes
+ * @param coef_nb_bits number of bits for escaped level codes
+ * @return 0 on success, -1 otherwise
+ */
+int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb,
+ VLC *vlc,
+ const float *level_table, const uint16_t *run_table,
+ int version, WMACoef *ptr, int offset,
+ int num_coefs, int block_len, int frame_len_bits,
+ int coef_nb_bits)
+{
+ int code, level, sign;
+ const uint32_t *ilvl = (const uint32_t*)level_table;
+ uint32_t *iptr = (uint32_t*)ptr;
+ const unsigned int coef_mask = block_len - 1;
+ for (; offset < num_coefs; offset++) {
+ code = get_vlc2(gb, vlc->table, VLCBITS, VLCMAX);
+ if (code > 1) {
+ /** normal code */
+ offset += run_table[code];
+ sign = get_bits1(gb) - 1;
+ iptr[offset & coef_mask] = ilvl[code] ^ sign<<31;
+ } else if (code == 1) {
+ /** EOB */
+ break;
+ } else {
+ /** escape */
+ if (!version) {
+ level = get_bits(gb, coef_nb_bits);
+ /** NOTE: this is rather suboptimal. reading
+ block_len_bits would be better */
+ offset += get_bits(gb, frame_len_bits);
+ } else {
+ level = ff_wma_get_large_val(gb);
+ /** escape decode */
+ if (get_bits1(gb)) {
+ if (get_bits1(gb)) {
+ if (get_bits1(gb)) {
+ av_log(avctx,AV_LOG_ERROR,
+ "broken escape sequence\n");
+ return -1;
+ } else
+ offset += get_bits(gb, frame_len_bits) + 4;
+ } else
+ offset += get_bits(gb, 2) + 1;
+ }
+ }
+ sign = get_bits1(gb) - 1;
+ ptr[offset & coef_mask] = (level^sign) - sign;
+ }
+ }
+ /** NOTE: EOB can be omitted */
+ if (offset > num_coefs) {
+ av_log(avctx, AV_LOG_ERROR, "overflow in spectral RLE, ignoring\n");
+ return -1;
+ }
+
+ return 0;
+}
projects / ffmpeg / blobdiff