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-rw-r--r--ffmpeg/libavcodec/wma.c488
1 files changed, 488 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/wma.c b/ffmpeg/libavcodec/wma.c
new file mode 100644
index 0000000..1e6ca61
--- /dev/null
+++ b/ffmpeg/libavcodec/wma.c
@@ -0,0 +1,488 @@
+/*
+ * WMA compatible codec
+ * Copyright (c) 2002-2007 The FFmpeg Project
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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,
+ * 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
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avcodec.h"
+#include "sinewin.h"
+#include "wma.h"
+#include "wma_common.h"
+#include "wmadata.h"
+
+#undef NDEBUG
+#include <assert.h>
+
+/* 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,
+ 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 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));
+ level_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;
+ l = levels_table[k++];
+ 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 = flevel_table;
+ *pint_table = int_table;
+ av_free(level_table);
+}
+
+int ff_wma_init(AVCodecContext *avctx, int flags2)
+{
+ WMACodecContext *s = avctx->priv_data;
+ int i;
+ 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 > 2
+ || avctx->bit_rate <= 0)
+ return -1;
+
+ ff_fmt_convert_init(&s->fmt_conv, avctx);
+ avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);
+
+ if (avctx->codec->id == AV_CODEC_ID_WMAV1) {
+ s->version = 1;
+ } else {
+ s->version = 2;
+ }
+
+ /* compute MDCT block size */
+ 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 ((avctx->bit_rate / avctx->channels) >= 32000)
+ nb += 2;
+ nb_max = s->frame_len_bits - BLOCK_MIN_BITS;
+ if (nb > nb_max)
+ nb = nb_max;
+ s->nb_block_sizes = nb + 1;
+ } else {
+ s->nb_block_sizes = 1;
+ }
+
+ /* init rate dependent parameters */
+ s->use_noise_coding = 1;
+ high_freq = avctx->sample_rate * 0.5;
+
+ /* if version 2, then the rates are normalized */
+ sample_rate1 = avctx->sample_rate;
+ if (s->version == 2) {
+ if (sample_rate1 >= 44100) {
+ sample_rate1 = 44100;
+ } else if (sample_rate1 >= 22050) {
+ sample_rate1 = 22050;
+ } else if (sample_rate1 >= 16000) {
+ sample_rate1 = 16000;
+ } else if (sample_rate1 >= 11025) {
+ sample_rate1 = 11025;
+ } else if (sample_rate1 >= 8000) {
+ sample_rate1 = 8000;
+ }
+ }
+
+ 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;
+ if (s->byte_offset_bits + 3 > MIN_CACHE_BITS) {
+ av_log(avctx, AV_LOG_ERROR, "byte_offset_bits %d is too large\n", s->byte_offset_bits);
+ return AVERROR_PATCHWELCOME;
+ }
+
+ /* compute high frequency value and choose if noise coding should
+ be activated */
+ bps1 = bps;
+ if (avctx->channels == 2)
+ bps1 = bps * 1.6;
+ if (sample_rate1 == 44100) {
+ if (bps1 >= 0.61) {
+ s->use_noise_coding = 0;
+ } else {
+ high_freq = high_freq * 0.4;
+ }
+ } else if (sample_rate1 == 22050) {
+ if (bps1 >= 1.16) {
+ s->use_noise_coding = 0;
+ } else if (bps1 >= 0.72) {
+ high_freq = high_freq * 0.7;
+ } else {
+ high_freq = high_freq * 0.6;
+ }
+ } else if (sample_rate1 == 16000) {
+ if (bps > 0.5) {
+ high_freq = high_freq * 0.5;
+ } else {
+ high_freq = high_freq * 0.3;
+ }
+ } else if (sample_rate1 == 11025) {
+ high_freq = high_freq * 0.7;
+ } else if (sample_rate1 == 8000) {
+ if (bps <= 0.625) {
+ high_freq = high_freq * 0.5;
+ } else if (bps > 0.75) {
+ s->use_noise_coding = 0;
+ } else {
+ high_freq = high_freq * 0.65;
+ }
+ } else {
+ if (bps >= 0.8) {
+ high_freq = high_freq * 0.75;
+ } else if (bps >= 0.6) {
+ high_freq = high_freq * 0.6;
+ } else {
+ high_freq = high_freq * 0.5;
+ }
+ }
+ 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 */
+ {
+ int a, b, pos, lpos, k, block_len, i, j, n;
+ const uint8_t *table;
+
+ if (s->version == 1) {
+ s->coefs_start = 3;
+ } else {
+ s->coefs_start = 0;
+ }
+ 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 = 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;
+ if (pos >= block_len) {
+ i++;
+ break;
+ }
+ lpos = pos;
+ }
+ s->exponent_sizes[0] = i;
+ } else {
+ /* hardcoded tables */
+ table = NULL;
+ a = s->frame_len_bits - BLOCK_MIN_BITS - k;
+ if (a < 3) {
+ if (avctx->sample_rate >= 44100) {
+ table = exponent_band_44100[a];
+ } else if (avctx->sample_rate >= 32000) {
+ table = exponent_band_32000[a];
+ } else if (avctx->sample_rate >= 22050) {
+ table = exponent_band_22050[a];
+ }
+ }
+ if (table) {
+ n = *table++;
+ 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 = 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;
+ if (pos > lpos)
+ s->exponent_bands[k][j++] = pos - lpos;
+ if (pos >= block_len)
+ break;
+ lpos = pos;
+ }
+ s->exponent_sizes[k] = j;
+ }
+ }
+
+ /* max number of coefs */
+ 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) /
+ avctx->sample_rate + 0.5);
+ n = s->exponent_sizes[k];
+ j = 0;
+ pos = 0;
+ for (i = 0; i < n; i++) {
+ int start, end;
+ start = pos;
+ pos += s->exponent_bands[k][i];
+ end = pos;
+ if (start < s->high_band_start[k])
+ start = s->high_band_start[k];
+ if (end > s->coefs_end[k])
+ end = s->coefs_end[k];
+ if (end > start)
+ s->exponent_high_bands[k][j++] = end - start;
+ }
+ 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++)
+ 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++) {
+ tprintf(s->avctx, "%5d: n=%2d:",
+ 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++) {
+ 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) {
+ s->noise_mult = 0.02;
+ } else {
+ s->noise_mult = 0.04;
+ }
+
+#ifdef TRACE
+ for (i = 0; i < NOISE_TAB_SIZE; i++)
+ s->noise_table[i] = 1.0 * s->noise_mult;
+#else
+ {
+ unsigned int seed;
+ float norm;
+ seed = 1;
+ norm = (1.0 / (float)(1LL << 31)) * sqrt(3) * s->noise_mult;
+ for (i = 0; i < NOISE_TAB_SIZE; i++) {
+ seed = seed * 314159 + 1;
+ s->noise_table[i] = (float)((int)seed) * norm;
+ }
+ }
+#endif
+ }
+
+ /* choose the VLC tables for the coefficients */
+ coef_vlc_table = 2;
+ if (avctx->sample_rate >= 32000) {
+ if (bps1 < 0.72) {
+ coef_vlc_table = 0;
+ } 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];
+ init_coef_vlc(&s->coef_vlc[0], &s->run_table[0], &s->level_table[0], &s->int_table[0],
+ s->coef_vlcs[0]);
+ init_coef_vlc(&s->coef_vlc[1], &s->run_table[1], &s->level_table[1], &s->int_table[1],
+ s->coef_vlcs[1]);
+
+ return 0;
+}
+
+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;
+ else if (total_gain < 45) return 10;
+ else return 9;
+}
+
+int ff_wma_end(AVCodecContext *avctx)
+{
+ WMACodecContext *s = avctx->priv_data;
+ int i;
+
+ for (i = 0; i < s->nb_block_sizes; i++)
+ ff_mdct_end(&s->mdct_ctx[i]);
+
+ if (s->use_exp_vlc) {
+ ff_free_vlc(&s->exp_vlc);
+ }
+ if (s->use_noise_coding) {
+ ff_free_vlc(&s->hgain_vlc);
+ }
+ 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;
+}
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