diff options
Diffstat (limited to 'contrib/ffmpeg/libavcodec/wmadec.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/wmadec.c | 912 |
1 files changed, 0 insertions, 912 deletions
diff --git a/contrib/ffmpeg/libavcodec/wmadec.c b/contrib/ffmpeg/libavcodec/wmadec.c deleted file mode 100644 index ef3cc7a33..000000000 --- a/contrib/ffmpeg/libavcodec/wmadec.c +++ /dev/null @@ -1,912 +0,0 @@ -/* - * WMA compatible decoder - * Copyright (c) 2002 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 - */ - -/** - * @file wmadec.c - * WMA compatible decoder. - * This decoder handles Microsoft Windows Media Audio data, versions 1 & 2. - * WMA v1 is identified by audio format 0x160 in Microsoft media files - * (ASF/AVI/WAV). WMA v2 is identified by audio format 0x161. - * - * To use this decoder, a calling application must supply the extra data - * bytes provided with the WMA data. These are the extra, codec-specific - * bytes at the end of a WAVEFORMATEX data structure. Transmit these bytes - * to the decoder using the extradata[_size] fields in AVCodecContext. There - * should be 4 extra bytes for v1 data and 6 extra bytes for v2 data. - */ - -#include "avcodec.h" -#include "wma.h" - -#undef NDEBUG -#include <assert.h> - -#define EXPVLCBITS 8 -#define EXPMAX ((19+EXPVLCBITS-1)/EXPVLCBITS) - -#define HGAINVLCBITS 9 -#define HGAINMAX ((13+HGAINVLCBITS-1)/HGAINVLCBITS) - -static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len); - -#ifdef TRACE -static void dump_shorts(WMADecodeContext *s, const char *name, const short *tab, int n) -{ - int i; - - tprintf(s->avctx, "%s[%d]:\n", name, n); - for(i=0;i<n;i++) { - if ((i & 7) == 0) - tprintf(s->avctx, "%4d: ", i); - tprintf(s->avctx, " %5d.0", tab[i]); - if ((i & 7) == 7) - tprintf(s->avctx, "\n"); - } -} - -static void dump_floats(WMADecodeContext *s, const char *name, int prec, const float *tab, int n) -{ - int i; - - tprintf(s->avctx, "%s[%d]:\n", name, n); - for(i=0;i<n;i++) { - if ((i & 7) == 0) - tprintf(s->avctx, "%4d: ", i); - tprintf(s->avctx, " %8.*f", prec, tab[i]); - if ((i & 7) == 7) - tprintf(s->avctx, "\n"); - } - if ((i & 7) != 0) - tprintf(s->avctx, "\n"); -} -#endif - -static int wma_decode_init(AVCodecContext * avctx) -{ - WMACodecContext *s = avctx->priv_data; - int i, flags1, flags2; - uint8_t *extradata; - - s->avctx = avctx; - - /* extract flag infos */ - flags1 = 0; - flags2 = 0; - extradata = avctx->extradata; - if (avctx->codec->id == CODEC_ID_WMAV1 && avctx->extradata_size >= 4) { - flags1 = extradata[0] | (extradata[1] << 8); - flags2 = extradata[2] | (extradata[3] << 8); - } else if (avctx->codec->id == CODEC_ID_WMAV2 && avctx->extradata_size >= 6) { - flags1 = extradata[0] | (extradata[1] << 8) | - (extradata[2] << 16) | (extradata[3] << 24); - flags2 = extradata[4] | (extradata[5] << 8); - } -// for(i=0; i<avctx->extradata_size; i++) -// av_log(NULL, AV_LOG_ERROR, "%02X ", extradata[i]); - - s->use_exp_vlc = flags2 & 0x0001; - s->use_bit_reservoir = flags2 & 0x0002; - s->use_variable_block_len = flags2 & 0x0004; - - ff_wma_init(avctx, flags2); - - /* init MDCT */ - for(i = 0; i < s->nb_block_sizes; i++) - ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1); - - if (s->use_noise_coding) { - init_vlc(&s->hgain_vlc, HGAINVLCBITS, sizeof(ff_wma_hgain_huffbits), - ff_wma_hgain_huffbits, 1, 1, - ff_wma_hgain_huffcodes, 2, 2, 0); - } - - if (s->use_exp_vlc) { - init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_wma_scale_huffbits), //FIXME move out of context - ff_wma_scale_huffbits, 1, 1, - ff_wma_scale_huffcodes, 4, 4, 0); - } else { - wma_lsp_to_curve_init(s, s->frame_len); - } - - return 0; -} - -/** - * interpolate values for a bigger or smaller block. The block must - * have multiple sizes - */ -static void interpolate_array(float *scale, int old_size, int new_size) -{ - int i, j, jincr, k; - float v; - - if (new_size > old_size) { - jincr = new_size / old_size; - j = new_size; - for(i = old_size - 1; i >=0; i--) { - v = scale[i]; - k = jincr; - do { - scale[--j] = v; - } while (--k); - } - } else if (new_size < old_size) { - j = 0; - jincr = old_size / new_size; - for(i = 0; i < new_size; i++) { - scale[i] = scale[j]; - j += jincr; - } - } -} - -/** - * compute x^-0.25 with an exponent and mantissa table. We use linear - * interpolation to reduce the mantissa table size at a small speed - * expense (linear interpolation approximately doubles the number of - * bits of precision). - */ -static inline float pow_m1_4(WMACodecContext *s, float x) -{ - union { - float f; - unsigned int v; - } u, t; - unsigned int e, m; - float a, b; - - u.f = x; - e = u.v >> 23; - m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1); - /* build interpolation scale: 1 <= t < 2. */ - t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23); - a = s->lsp_pow_m_table1[m]; - b = s->lsp_pow_m_table2[m]; - return s->lsp_pow_e_table[e] * (a + b * t.f); -} - -static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len) -{ - float wdel, a, b; - int i, e, m; - - wdel = M_PI / frame_len; - for(i=0;i<frame_len;i++) - s->lsp_cos_table[i] = 2.0f * cos(wdel * i); - - /* tables for x^-0.25 computation */ - for(i=0;i<256;i++) { - e = i - 126; - s->lsp_pow_e_table[i] = pow(2.0, e * -0.25); - } - - /* NOTE: these two tables are needed to avoid two operations in - pow_m1_4 */ - b = 1.0; - for(i=(1 << LSP_POW_BITS) - 1;i>=0;i--) { - m = (1 << LSP_POW_BITS) + i; - a = (float)m * (0.5 / (1 << LSP_POW_BITS)); - a = pow(a, -0.25); - s->lsp_pow_m_table1[i] = 2 * a - b; - s->lsp_pow_m_table2[i] = b - a; - b = a; - } -#if 0 - for(i=1;i<20;i++) { - float v, r1, r2; - v = 5.0 / i; - r1 = pow_m1_4(s, v); - r2 = pow(v,-0.25); - printf("%f^-0.25=%f e=%f\n", v, r1, r2 - r1); - } -#endif -} - -/** - * NOTE: We use the same code as Vorbis here - * @todo optimize it further with SSE/3Dnow - */ -static void wma_lsp_to_curve(WMACodecContext *s, - float *out, float *val_max_ptr, - int n, float *lsp) -{ - int i, j; - float p, q, w, v, val_max; - - val_max = 0; - for(i=0;i<n;i++) { - p = 0.5f; - q = 0.5f; - w = s->lsp_cos_table[i]; - for(j=1;j<NB_LSP_COEFS;j+=2){ - q *= w - lsp[j - 1]; - p *= w - lsp[j]; - } - p *= p * (2.0f - w); - q *= q * (2.0f + w); - v = p + q; - v = pow_m1_4(s, v); - if (v > val_max) - val_max = v; - out[i] = v; - } - *val_max_ptr = val_max; -} - -/** - * decode exponents coded with LSP coefficients (same idea as Vorbis) - */ -static void decode_exp_lsp(WMACodecContext *s, int ch) -{ - float lsp_coefs[NB_LSP_COEFS]; - int val, i; - - for(i = 0; i < NB_LSP_COEFS; i++) { - if (i == 0 || i >= 8) - val = get_bits(&s->gb, 3); - else - val = get_bits(&s->gb, 4); - lsp_coefs[i] = ff_wma_lsp_codebook[i][val]; - } - - wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch], - s->block_len, lsp_coefs); -} - -/** - * decode exponents coded with VLC codes - */ -static int decode_exp_vlc(WMACodecContext *s, int ch) -{ - int last_exp, n, code; - const uint16_t *ptr, *band_ptr; - float v, *q, max_scale, *q_end; - - band_ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits]; - ptr = band_ptr; - q = s->exponents[ch]; - q_end = q + s->block_len; - max_scale = 0; - if (s->version == 1) { - last_exp = get_bits(&s->gb, 5) + 10; - /* XXX: use a table */ - v = pow(10, last_exp * (1.0 / 16.0)); - max_scale = v; - n = *ptr++; - do { - *q++ = v; - } while (--n); - }else - last_exp = 36; - - while (q < q_end) { - code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX); - if (code < 0) - return -1; - /* NOTE: this offset is the same as MPEG4 AAC ! */ - last_exp += code - 60; - /* XXX: use a table */ - v = pow(10, last_exp * (1.0 / 16.0)); - if (v > max_scale) - max_scale = v; - n = *ptr++; - do { - *q++ = v; - } while (--n); - } - s->max_exponent[ch] = max_scale; - return 0; -} - - -/** - * Apply MDCT window and add into output. - * - * We ensure that when the windows overlap their squared sum - * is always 1 (MDCT reconstruction rule). - */ -static void wma_window(WMACodecContext *s, float *out) -{ - float *in = s->output; - int block_len, bsize, n; - - /* left part */ - if (s->block_len_bits <= s->prev_block_len_bits) { - block_len = s->block_len; - bsize = s->frame_len_bits - s->block_len_bits; - - s->dsp.vector_fmul_add_add(out, in, s->windows[bsize], - out, 0, block_len, 1); - - } else { - block_len = 1 << s->prev_block_len_bits; - n = (s->block_len - block_len) / 2; - bsize = s->frame_len_bits - s->prev_block_len_bits; - - s->dsp.vector_fmul_add_add(out+n, in+n, s->windows[bsize], - out+n, 0, block_len, 1); - - memcpy(out+n+block_len, in+n+block_len, n*sizeof(float)); - } - - out += s->block_len; - in += s->block_len; - - /* right part */ - if (s->block_len_bits <= s->next_block_len_bits) { - block_len = s->block_len; - bsize = s->frame_len_bits - s->block_len_bits; - - s->dsp.vector_fmul_reverse(out, in, s->windows[bsize], block_len); - - } else { - block_len = 1 << s->next_block_len_bits; - n = (s->block_len - block_len) / 2; - bsize = s->frame_len_bits - s->next_block_len_bits; - - memcpy(out, in, n*sizeof(float)); - - s->dsp.vector_fmul_reverse(out+n, in+n, s->windows[bsize], block_len); - - memset(out+n+block_len, 0, n*sizeof(float)); - } -} - - -/** - * @return 0 if OK. 1 if last block of frame. return -1 if - * unrecorrable error. - */ -static int wma_decode_block(WMACodecContext *s) -{ - int n, v, a, ch, code, bsize; - int coef_nb_bits, total_gain, parse_exponents; - int nb_coefs[MAX_CHANNELS]; - float mdct_norm; - -#ifdef TRACE - tprintf(s->avctx, "***decode_block: %d:%d\n", s->frame_count - 1, s->block_num); -#endif - - /* compute current block length */ - if (s->use_variable_block_len) { - n = av_log2(s->nb_block_sizes - 1) + 1; - - if (s->reset_block_lengths) { - s->reset_block_lengths = 0; - v = get_bits(&s->gb, n); - if (v >= s->nb_block_sizes) - return -1; - s->prev_block_len_bits = s->frame_len_bits - v; - v = get_bits(&s->gb, n); - if (v >= s->nb_block_sizes) - return -1; - s->block_len_bits = s->frame_len_bits - v; - } else { - /* update block lengths */ - s->prev_block_len_bits = s->block_len_bits; - s->block_len_bits = s->next_block_len_bits; - } - v = get_bits(&s->gb, n); - if (v >= s->nb_block_sizes) - return -1; - s->next_block_len_bits = s->frame_len_bits - v; - } else { - /* fixed block len */ - 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; - } - - /* now check if the block length is coherent with the frame length */ - s->block_len = 1 << s->block_len_bits; - if ((s->block_pos + s->block_len) > s->frame_len) - return -1; - - if (s->nb_channels == 2) { - s->ms_stereo = get_bits(&s->gb, 1); - } - v = 0; - for(ch = 0; ch < s->nb_channels; ch++) { - a = get_bits(&s->gb, 1); - s->channel_coded[ch] = a; - v |= a; - } - /* if no channel coded, no need to go further */ - /* XXX: fix potential framing problems */ - if (!v) - goto next; - - bsize = s->frame_len_bits - s->block_len_bits; - - /* read total gain and extract corresponding number of bits for - coef escape coding */ - total_gain = 1; - for(;;) { - a = get_bits(&s->gb, 7); - total_gain += a; - if (a != 127) - break; - } - - coef_nb_bits= ff_wma_total_gain_to_bits(total_gain); - - /* compute number of coefficients */ - n = s->coefs_end[bsize] - s->coefs_start; - for(ch = 0; ch < s->nb_channels; ch++) - nb_coefs[ch] = n; - - /* complex coding */ - if (s->use_noise_coding) { - - for(ch = 0; ch < s->nb_channels; ch++) { - if (s->channel_coded[ch]) { - int i, n, a; - n = s->exponent_high_sizes[bsize]; - for(i=0;i<n;i++) { - a = get_bits(&s->gb, 1); - s->high_band_coded[ch][i] = a; - /* if noise coding, the coefficients are not transmitted */ - if (a) - nb_coefs[ch] -= s->exponent_high_bands[bsize][i]; - } - } - } - for(ch = 0; ch < s->nb_channels; ch++) { - if (s->channel_coded[ch]) { - int i, n, val, code; - - n = s->exponent_high_sizes[bsize]; - val = (int)0x80000000; - for(i=0;i<n;i++) { - if (s->high_band_coded[ch][i]) { - if (val == (int)0x80000000) { - val = get_bits(&s->gb, 7) - 19; - } else { - code = get_vlc2(&s->gb, s->hgain_vlc.table, HGAINVLCBITS, HGAINMAX); - if (code < 0) - return -1; - val += code - 18; - } - s->high_band_values[ch][i] = val; - } - } - } - } - } - - /* exposant can be interpolated in short blocks. */ - parse_exponents = 1; - if (s->block_len_bits != s->frame_len_bits) { - parse_exponents = get_bits(&s->gb, 1); - } - - if (parse_exponents) { - for(ch = 0; ch < s->nb_channels; ch++) { - if (s->channel_coded[ch]) { - if (s->use_exp_vlc) { - if (decode_exp_vlc(s, ch) < 0) - return -1; - } else { - decode_exp_lsp(s, ch); - } - } - } - } else { - for(ch = 0; ch < s->nb_channels; ch++) { - if (s->channel_coded[ch]) { - interpolate_array(s->exponents[ch], 1 << s->prev_block_len_bits, - s->block_len); - } - } - } - - /* parse spectral coefficients : just RLE encoding */ - for(ch = 0; ch < s->nb_channels; ch++) { - if (s->channel_coded[ch]) { - VLC *coef_vlc; - int level, run, sign, tindex; - int16_t *ptr, *eptr; - const uint16_t *level_table, *run_table; - - /* special VLC tables are used for ms stereo because - there is potentially less energy there */ - tindex = (ch == 1 && s->ms_stereo); - coef_vlc = &s->coef_vlc[tindex]; - run_table = s->run_table[tindex]; - level_table = s->level_table[tindex]; - /* XXX: optimize */ - ptr = &s->coefs1[ch][0]; - eptr = ptr + nb_coefs[ch]; - memset(ptr, 0, s->block_len * sizeof(int16_t)); - for(;;) { - code = get_vlc2(&s->gb, coef_vlc->table, VLCBITS, VLCMAX); - if (code < 0) - return -1; - if (code == 1) { - /* EOB */ - break; - } else if (code == 0) { - /* escape */ - level = get_bits(&s->gb, coef_nb_bits); - /* NOTE: this is rather suboptimal. reading - block_len_bits would be better */ - run = get_bits(&s->gb, s->frame_len_bits); - } else { - /* normal code */ - run = run_table[code]; - level = level_table[code]; - } - sign = get_bits(&s->gb, 1); - if (!sign) - level = -level; - ptr += run; - if (ptr >= eptr) - { - av_log(NULL, AV_LOG_ERROR, "overflow in spectral RLE, ignoring\n"); - break; - } - *ptr++ = level; - /* NOTE: EOB can be omitted */ - if (ptr >= eptr) - break; - } - } - if (s->version == 1 && s->nb_channels >= 2) { - align_get_bits(&s->gb); - } - } - - /* normalize */ - { - int n4 = s->block_len / 2; - mdct_norm = 1.0 / (float)n4; - if (s->version == 1) { - mdct_norm *= sqrt(n4); - } - } - - /* finally compute the MDCT coefficients */ - for(ch = 0; ch < s->nb_channels; ch++) { - if (s->channel_coded[ch]) { - int16_t *coefs1; - float *coefs, *exponents, mult, mult1, noise, *exp_ptr; - int i, j, n, n1, last_high_band; - float exp_power[HIGH_BAND_MAX_SIZE]; - - coefs1 = s->coefs1[ch]; - exponents = s->exponents[ch]; - mult = pow(10, total_gain * 0.05) / s->max_exponent[ch]; - mult *= mdct_norm; - coefs = s->coefs[ch]; - if (s->use_noise_coding) { - mult1 = mult; - /* very low freqs : noise */ - for(i = 0;i < s->coefs_start; i++) { - *coefs++ = s->noise_table[s->noise_index] * (*exponents++) * mult1; - s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1); - } - - n1 = s->exponent_high_sizes[bsize]; - - /* compute power of high bands */ - exp_ptr = exponents + - s->high_band_start[bsize] - - s->coefs_start; - last_high_band = 0; /* avoid warning */ - for(j=0;j<n1;j++) { - n = s->exponent_high_bands[s->frame_len_bits - - s->block_len_bits][j]; - if (s->high_band_coded[ch][j]) { - float e2, v; - e2 = 0; - for(i = 0;i < n; i++) { - v = exp_ptr[i]; - e2 += v * v; - } - exp_power[j] = e2 / n; - last_high_band = j; - tprintf(s->avctx, "%d: power=%f (%d)\n", j, exp_power[j], n); - } - exp_ptr += n; - } - - /* main freqs and high freqs */ - for(j=-1;j<n1;j++) { - if (j < 0) { - n = s->high_band_start[bsize] - - s->coefs_start; - } else { - n = s->exponent_high_bands[s->frame_len_bits - - s->block_len_bits][j]; - } - if (j >= 0 && s->high_band_coded[ch][j]) { - /* use noise with specified power */ - mult1 = sqrt(exp_power[j] / exp_power[last_high_band]); - /* XXX: use a table */ - mult1 = mult1 * pow(10, s->high_band_values[ch][j] * 0.05); - mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult); - mult1 *= mdct_norm; - for(i = 0;i < n; i++) { - noise = s->noise_table[s->noise_index]; - s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1); - *coefs++ = (*exponents++) * noise * mult1; - } - } else { - /* coded values + small noise */ - for(i = 0;i < n; i++) { - noise = s->noise_table[s->noise_index]; - s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1); - *coefs++ = ((*coefs1++) + noise) * (*exponents++) * mult; - } - } - } - - /* very high freqs : noise */ - n = s->block_len - s->coefs_end[bsize]; - mult1 = mult * exponents[-1]; - for(i = 0; i < n; i++) { - *coefs++ = s->noise_table[s->noise_index] * mult1; - s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1); - } - } else { - /* XXX: optimize more */ - for(i = 0;i < s->coefs_start; i++) - *coefs++ = 0.0; - n = nb_coefs[ch]; - for(i = 0;i < n; i++) { - *coefs++ = coefs1[i] * exponents[i] * mult; - } - n = s->block_len - s->coefs_end[bsize]; - for(i = 0;i < n; i++) - *coefs++ = 0.0; - } - } - } - -#ifdef TRACE - for(ch = 0; ch < s->nb_channels; ch++) { - if (s->channel_coded[ch]) { - dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len); - dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len); - } - } -#endif - - if (s->ms_stereo && s->channel_coded[1]) { - float a, b; - int i; - - /* nominal case for ms stereo: we do it before mdct */ - /* no need to optimize this case because it should almost - never happen */ - if (!s->channel_coded[0]) { - tprintf(s->avctx, "rare ms-stereo case happened\n"); - memset(s->coefs[0], 0, sizeof(float) * s->block_len); - s->channel_coded[0] = 1; - } - - for(i = 0; i < s->block_len; i++) { - a = s->coefs[0][i]; - b = s->coefs[1][i]; - s->coefs[0][i] = a + b; - s->coefs[1][i] = a - b; - } - } - - for(ch = 0; ch < s->nb_channels; ch++) { - if (s->channel_coded[ch]) { - int n4, index, n; - - n = s->block_len; - n4 = s->block_len / 2; - s->mdct_ctx[bsize].fft.imdct_calc(&s->mdct_ctx[bsize], - s->output, s->coefs[ch], s->mdct_tmp); - - /* multiply by the window and add in the frame */ - index = (s->frame_len / 2) + s->block_pos - n4; - wma_window(s, &s->frame_out[ch][index]); - - /* specific fast case for ms-stereo : add to second - channel if it is not coded */ - if (s->ms_stereo && !s->channel_coded[1]) { - wma_window(s, &s->frame_out[1][index]); - } - } - } - next: - /* update block number */ - s->block_num++; - s->block_pos += s->block_len; - if (s->block_pos >= s->frame_len) - return 1; - else - return 0; -} - -/* decode a frame of frame_len samples */ -static int wma_decode_frame(WMACodecContext *s, int16_t *samples) -{ - int ret, i, n, a, ch, incr; - int16_t *ptr; - float *iptr; - -#ifdef TRACE - tprintf(s->avctx, "***decode_frame: %d size=%d\n", s->frame_count++, s->frame_len); -#endif - - /* read each block */ - s->block_num = 0; - s->block_pos = 0; - for(;;) { - ret = wma_decode_block(s); - if (ret < 0) - return -1; - if (ret) - break; - } - - /* convert frame to integer */ - n = s->frame_len; - incr = s->nb_channels; - for(ch = 0; ch < s->nb_channels; ch++) { - ptr = samples + ch; - iptr = s->frame_out[ch]; - - for(i=0;i<n;i++) { - a = lrintf(*iptr++); - if (a > 32767) - a = 32767; - else if (a < -32768) - a = -32768; - *ptr = a; - ptr += incr; - } - /* prepare for next block */ - memmove(&s->frame_out[ch][0], &s->frame_out[ch][s->frame_len], - s->frame_len * sizeof(float)); - } - -#ifdef TRACE - dump_shorts(s, "samples", samples, n * s->nb_channels); -#endif - return 0; -} - -static int wma_decode_superframe(AVCodecContext *avctx, - void *data, int *data_size, - uint8_t *buf, int buf_size) -{ - WMACodecContext *s = avctx->priv_data; - int nb_frames, bit_offset, i, pos, len; - uint8_t *q; - int16_t *samples; - - tprintf(avctx, "***decode_superframe:\n"); - - if(buf_size==0){ - s->last_superframe_len = 0; - return 0; - } - - samples = data; - - init_get_bits(&s->gb, buf, buf_size*8); - - if (s->use_bit_reservoir) { - /* read super frame header */ - get_bits(&s->gb, 4); /* super frame index */ - nb_frames = get_bits(&s->gb, 4) - 1; - - bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3); - - if (s->last_superframe_len > 0) { - // printf("skip=%d\n", s->last_bitoffset); - /* add bit_offset bits to last frame */ - if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) > - MAX_CODED_SUPERFRAME_SIZE) - goto fail; - q = s->last_superframe + s->last_superframe_len; - len = bit_offset; - while (len > 7) { - *q++ = (get_bits)(&s->gb, 8); - len -= 8; - } - if (len > 0) { - *q++ = (get_bits)(&s->gb, len) << (8 - len); - } - - /* XXX: bit_offset bits into last frame */ - init_get_bits(&s->gb, s->last_superframe, MAX_CODED_SUPERFRAME_SIZE*8); - /* skip unused bits */ - if (s->last_bitoffset > 0) - skip_bits(&s->gb, s->last_bitoffset); - /* this frame is stored in the last superframe and in the - current one */ - if (wma_decode_frame(s, samples) < 0) - goto fail; - samples += s->nb_channels * s->frame_len; - } - - /* read each frame starting from bit_offset */ - pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3; - init_get_bits(&s->gb, buf + (pos >> 3), (MAX_CODED_SUPERFRAME_SIZE - (pos >> 3))*8); - len = pos & 7; - if (len > 0) - skip_bits(&s->gb, len); - - s->reset_block_lengths = 1; - for(i=0;i<nb_frames;i++) { - if (wma_decode_frame(s, samples) < 0) - goto fail; - samples += s->nb_channels * s->frame_len; - } - - /* we copy the end of the frame in the last frame buffer */ - pos = get_bits_count(&s->gb) + ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7); - s->last_bitoffset = pos & 7; - pos >>= 3; - len = buf_size - pos; - if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) { - goto fail; - } - s->last_superframe_len = len; - memcpy(s->last_superframe, buf + pos, len); - } else { - /* single frame decode */ - if (wma_decode_frame(s, samples) < 0) - goto fail; - samples += s->nb_channels * s->frame_len; - } - -//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d outbytes:%d eaten:%d\n", s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len, (int8_t *)samples - (int8_t *)data, s->block_align); - - *data_size = (int8_t *)samples - (int8_t *)data; - return s->block_align; - fail: - /* when error, we reset the bit reservoir */ - s->last_superframe_len = 0; - return -1; -} - -AVCodec wmav1_decoder = -{ - "wmav1", - CODEC_TYPE_AUDIO, - CODEC_ID_WMAV1, - sizeof(WMACodecContext), - wma_decode_init, - NULL, - ff_wma_end, - wma_decode_superframe, -}; - -AVCodec wmav2_decoder = -{ - "wmav2", - CODEC_TYPE_AUDIO, - CODEC_ID_WMAV2, - sizeof(WMACodecContext), - wma_decode_init, - NULL, - ff_wma_end, - wma_decode_superframe, -}; |