458 lines
16 KiB
C
Executable File
458 lines
16 KiB
C
Executable File
/*
|
|
* Musepack SV8 decoder
|
|
* Copyright (c) 2007 Konstantin Shishkov
|
|
*
|
|
* 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
|
|
* MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
|
|
* divided into 32 subbands.
|
|
*/
|
|
|
|
#include "libavutil/channel_layout.h"
|
|
#include "libavutil/lfg.h"
|
|
#include "avcodec.h"
|
|
#include "get_bits.h"
|
|
#include "internal.h"
|
|
#include "mpegaudiodsp.h"
|
|
|
|
#include "mpc.h"
|
|
#include "mpc8data.h"
|
|
#include "mpc8huff.h"
|
|
|
|
static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2];
|
|
static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc;
|
|
|
|
static const int q3_offsets[2] = { MPC8_Q3_OFFSET, MPC8_Q4_OFFSET };
|
|
static const int quant_offsets[6] = { MPC8_Q5_OFFSET, MPC8_Q6_OFFSET, MPC8_Q7_OFFSET, MPC8_Q8_OFFSET };
|
|
|
|
static inline int mpc8_dec_base(GetBitContext *gb, int k, int n)
|
|
{
|
|
int len = mpc8_cnk_len[k-1][n-1] - 1;
|
|
int code = len ? get_bits_long(gb, len) : 0;
|
|
|
|
if (code >= mpc8_cnk_lost[k-1][n-1])
|
|
code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1];
|
|
|
|
return code;
|
|
}
|
|
|
|
static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n)
|
|
{
|
|
int bits = 0;
|
|
const uint32_t * C = mpc8_cnk[k-1];
|
|
int code = mpc8_dec_base(gb, k, n);
|
|
|
|
do {
|
|
n--;
|
|
if (code >= C[n]) {
|
|
bits |= 1U << n;
|
|
code -= C[n];
|
|
C -= 32;
|
|
k--;
|
|
}
|
|
} while(k > 0);
|
|
|
|
return bits;
|
|
}
|
|
|
|
static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m)
|
|
{
|
|
if(mpc8_cnk_len[0][m] < 1) return 0;
|
|
return mpc8_dec_base(gb, 1, m+1);
|
|
}
|
|
|
|
static int mpc8_get_mask(GetBitContext *gb, int size, int t)
|
|
{
|
|
int mask = 0;
|
|
|
|
if(t && t != size)
|
|
mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size);
|
|
if((t << 1) > size) mask = ~mask;
|
|
|
|
return mask;
|
|
}
|
|
|
|
static const uint16_t vlc_offsets[13] = {
|
|
0, 640, 1184, 1748, 2298, 2426, 2554, 3066, 3578, 4106, 4618, 5196, 5708
|
|
};
|
|
|
|
static av_cold int mpc8_decode_init(AVCodecContext * avctx)
|
|
{
|
|
int i;
|
|
MPCContext *c = avctx->priv_data;
|
|
GetBitContext gb;
|
|
static int vlc_initialized = 0;
|
|
int channels;
|
|
|
|
static VLC_TYPE band_table[542][2];
|
|
static VLC_TYPE q1_table[520][2];
|
|
static VLC_TYPE q9up_table[524][2];
|
|
static VLC_TYPE scfi0_table[1 << MPC8_SCFI0_BITS][2];
|
|
static VLC_TYPE scfi1_table[1 << MPC8_SCFI1_BITS][2];
|
|
static VLC_TYPE dscf0_table[560][2];
|
|
static VLC_TYPE dscf1_table[598][2];
|
|
static VLC_TYPE q3_0_table[512][2];
|
|
static VLC_TYPE q3_1_table[516][2];
|
|
static VLC_TYPE codes_table[5708][2];
|
|
|
|
if(avctx->extradata_size < 2){
|
|
av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
|
|
return -1;
|
|
}
|
|
memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
|
|
av_lfg_init(&c->rnd, 0xDEADBEEF);
|
|
ff_mpadsp_init(&c->mpadsp);
|
|
|
|
ff_mpc_init();
|
|
|
|
init_get_bits(&gb, avctx->extradata, 16);
|
|
|
|
skip_bits(&gb, 3);//sample rate
|
|
c->maxbands = get_bits(&gb, 5) + 1;
|
|
if (c->maxbands >= BANDS) {
|
|
av_log(avctx,AV_LOG_ERROR, "maxbands %d too high\n", c->maxbands);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
channels = get_bits(&gb, 4) + 1;
|
|
if (channels > 2) {
|
|
avpriv_request_sample(avctx, "Multichannel MPC SV8");
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
c->MSS = get_bits1(&gb);
|
|
c->frames = 1 << (get_bits(&gb, 3) * 2);
|
|
|
|
avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
|
|
avctx->channel_layout = (channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
|
|
avctx->channels = channels;
|
|
|
|
if(vlc_initialized) return 0;
|
|
av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
|
|
|
|
band_vlc.table = band_table;
|
|
band_vlc.table_allocated = 542;
|
|
init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE,
|
|
mpc8_bands_bits, 1, 1,
|
|
mpc8_bands_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
|
|
|
|
q1_vlc.table = q1_table;
|
|
q1_vlc.table_allocated = 520;
|
|
init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE,
|
|
mpc8_q1_bits, 1, 1,
|
|
mpc8_q1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
|
|
q9up_vlc.table = q9up_table;
|
|
q9up_vlc.table_allocated = 524;
|
|
init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE,
|
|
mpc8_q9up_bits, 1, 1,
|
|
mpc8_q9up_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
|
|
|
|
scfi_vlc[0].table = scfi0_table;
|
|
scfi_vlc[0].table_allocated = 1 << MPC8_SCFI0_BITS;
|
|
init_vlc(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE,
|
|
mpc8_scfi0_bits, 1, 1,
|
|
mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
|
|
scfi_vlc[1].table = scfi1_table;
|
|
scfi_vlc[1].table_allocated = 1 << MPC8_SCFI1_BITS;
|
|
init_vlc(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE,
|
|
mpc8_scfi1_bits, 1, 1,
|
|
mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
|
|
|
|
dscf_vlc[0].table = dscf0_table;
|
|
dscf_vlc[0].table_allocated = 560;
|
|
init_vlc(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE,
|
|
mpc8_dscf0_bits, 1, 1,
|
|
mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
|
|
dscf_vlc[1].table = dscf1_table;
|
|
dscf_vlc[1].table_allocated = 598;
|
|
init_vlc(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE,
|
|
mpc8_dscf1_bits, 1, 1,
|
|
mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
|
|
|
|
q3_vlc[0].table = q3_0_table;
|
|
q3_vlc[0].table_allocated = 512;
|
|
ff_init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE,
|
|
mpc8_q3_bits, 1, 1,
|
|
mpc8_q3_codes, 1, 1,
|
|
mpc8_q3_syms, 1, 1, INIT_VLC_USE_NEW_STATIC);
|
|
q3_vlc[1].table = q3_1_table;
|
|
q3_vlc[1].table_allocated = 516;
|
|
ff_init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE,
|
|
mpc8_q4_bits, 1, 1,
|
|
mpc8_q4_codes, 1, 1,
|
|
mpc8_q4_syms, 1, 1, INIT_VLC_USE_NEW_STATIC);
|
|
|
|
for(i = 0; i < 2; i++){
|
|
res_vlc[i].table = &codes_table[vlc_offsets[0+i]];
|
|
res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i];
|
|
init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE,
|
|
&mpc8_res_bits[i], 1, 1,
|
|
&mpc8_res_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
|
|
|
|
q2_vlc[i].table = &codes_table[vlc_offsets[2+i]];
|
|
q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i];
|
|
init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE,
|
|
&mpc8_q2_bits[i], 1, 1,
|
|
&mpc8_q2_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
|
|
|
|
quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]];
|
|
quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i];
|
|
init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE,
|
|
&mpc8_q5_bits[i], 1, 1,
|
|
&mpc8_q5_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
|
|
quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]];
|
|
quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i];
|
|
init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE,
|
|
&mpc8_q6_bits[i], 1, 1,
|
|
&mpc8_q6_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
|
|
quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]];
|
|
quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i];
|
|
init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE,
|
|
&mpc8_q7_bits[i], 1, 1,
|
|
&mpc8_q7_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
|
|
quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]];
|
|
quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i];
|
|
init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE,
|
|
&mpc8_q8_bits[i], 1, 1,
|
|
&mpc8_q8_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
|
|
}
|
|
vlc_initialized = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mpc8_decode_frame(AVCodecContext * avctx, void *data,
|
|
int *got_frame_ptr, AVPacket *avpkt)
|
|
{
|
|
AVFrame *frame = data;
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
MPCContext *c = avctx->priv_data;
|
|
GetBitContext gb2, *gb = &gb2;
|
|
int i, j, k, ch, cnt, res, t;
|
|
Band *bands = c->bands;
|
|
int off;
|
|
int maxband, keyframe;
|
|
int last[2];
|
|
|
|
keyframe = c->cur_frame == 0;
|
|
|
|
if(keyframe){
|
|
memset(c->Q, 0, sizeof(c->Q));
|
|
c->last_bits_used = 0;
|
|
}
|
|
if ((res = init_get_bits8(gb, buf, buf_size)) < 0)
|
|
return res;
|
|
|
|
skip_bits(gb, c->last_bits_used & 7);
|
|
|
|
if(keyframe)
|
|
maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);
|
|
else{
|
|
maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
|
|
if(maxband > 32) maxband -= 33;
|
|
}
|
|
|
|
if (get_bits_left(gb) < 0) {
|
|
*got_frame_ptr = 0;
|
|
return buf_size;
|
|
}
|
|
|
|
if(maxband > c->maxbands + 1) {
|
|
av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
c->last_max_band = maxband;
|
|
|
|
/* read subband indexes */
|
|
if(maxband){
|
|
last[0] = last[1] = 0;
|
|
for(i = maxband - 1; i >= 0; i--){
|
|
for(ch = 0; ch < 2; ch++){
|
|
last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];
|
|
if(last[ch] > 15) last[ch] -= 17;
|
|
bands[i].res[ch] = last[ch];
|
|
}
|
|
}
|
|
if(c->MSS){
|
|
int mask;
|
|
|
|
cnt = 0;
|
|
for(i = 0; i < maxband; i++)
|
|
if(bands[i].res[0] || bands[i].res[1])
|
|
cnt++;
|
|
t = mpc8_get_mod_golomb(gb, cnt);
|
|
mask = mpc8_get_mask(gb, cnt, t);
|
|
for(i = maxband - 1; i >= 0; i--)
|
|
if(bands[i].res[0] || bands[i].res[1]){
|
|
bands[i].msf = mask & 1;
|
|
mask >>= 1;
|
|
}
|
|
}
|
|
}
|
|
for(i = maxband; i < c->maxbands; i++)
|
|
bands[i].res[0] = bands[i].res[1] = 0;
|
|
|
|
if(keyframe){
|
|
for(i = 0; i < 32; i++)
|
|
c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;
|
|
}
|
|
|
|
for(i = 0; i < maxband; i++){
|
|
if(bands[i].res[0] || bands[i].res[1]){
|
|
cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;
|
|
if(cnt >= 0){
|
|
t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);
|
|
if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);
|
|
if(bands[i].res[1]) bands[i].scfi[1] = t & 3;
|
|
}
|
|
}
|
|
}
|
|
|
|
for(i = 0; i < maxband; i++){
|
|
for(ch = 0; ch < 2; ch++){
|
|
if(!bands[i].res[ch]) continue;
|
|
|
|
if(c->oldDSCF[ch][i]){
|
|
bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;
|
|
c->oldDSCF[ch][i] = 0;
|
|
}else{
|
|
t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);
|
|
if(t == 64)
|
|
t += get_bits(gb, 6);
|
|
bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;
|
|
}
|
|
for(j = 0; j < 2; j++){
|
|
if((bands[i].scfi[ch] << j) & 2)
|
|
bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];
|
|
else{
|
|
t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);
|
|
if(t == 31)
|
|
t = 64 + get_bits(gb, 6);
|
|
bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){
|
|
for(ch = 0; ch < 2; ch++){
|
|
res = bands[i].res[ch];
|
|
switch(res){
|
|
case -1:
|
|
for(j = 0; j < SAMPLES_PER_BAND; j++)
|
|
c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
|
|
break;
|
|
case 0:
|
|
break;
|
|
case 1:
|
|
for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){
|
|
cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);
|
|
t = mpc8_get_mask(gb, 18, cnt);
|
|
for(k = 0; k < SAMPLES_PER_BAND / 2; k++)
|
|
c->Q[ch][off + j + k] = t & (1 << (SAMPLES_PER_BAND / 2 - k - 1))
|
|
? (get_bits1(gb) << 1) - 1 : 0;
|
|
}
|
|
break;
|
|
case 2:
|
|
cnt = 6;//2*mpc8_thres[res]
|
|
for(j = 0; j < SAMPLES_PER_BAND; j += 3){
|
|
t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);
|
|
c->Q[ch][off + j + 0] = mpc8_idx50[t];
|
|
c->Q[ch][off + j + 1] = mpc8_idx51[t];
|
|
c->Q[ch][off + j + 2] = mpc8_idx52[t];
|
|
cnt = (cnt >> 1) + mpc8_huffq2[t];
|
|
}
|
|
break;
|
|
case 3:
|
|
case 4:
|
|
for(j = 0; j < SAMPLES_PER_BAND; j += 2){
|
|
t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3];
|
|
c->Q[ch][off + j + 1] = t >> 4;
|
|
c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF);
|
|
}
|
|
break;
|
|
case 5:
|
|
case 6:
|
|
case 7:
|
|
case 8:
|
|
cnt = 2 * mpc8_thres[res];
|
|
for(j = 0; j < SAMPLES_PER_BAND; j++){
|
|
t = get_vlc2(gb, quant_vlc[res - 5][cnt > mpc8_thres[res]].table, quant_vlc[res - 5][cnt > mpc8_thres[res]].bits, 2) + quant_offsets[res - 5];
|
|
c->Q[ch][off + j] = t;
|
|
cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);
|
|
}
|
|
break;
|
|
default:
|
|
for(j = 0; j < SAMPLES_PER_BAND; j++){
|
|
c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);
|
|
if(res != 9){
|
|
c->Q[ch][off + j] <<= res - 9;
|
|
c->Q[ch][off + j] |= get_bits(gb, res - 9);
|
|
}
|
|
c->Q[ch][off + j] -= (1 << (res - 2)) - 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
frame->nb_samples = MPC_FRAME_SIZE;
|
|
if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
|
|
return res;
|
|
|
|
ff_mpc_dequantize_and_synth(c, maxband - 1,
|
|
(int16_t **)frame->extended_data,
|
|
avctx->channels);
|
|
|
|
c->cur_frame++;
|
|
|
|
c->last_bits_used = get_bits_count(gb);
|
|
if(c->cur_frame >= c->frames)
|
|
c->cur_frame = 0;
|
|
if (get_bits_left(gb) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb));
|
|
c->last_bits_used = buf_size << 3;
|
|
} else if (c->cur_frame == 0 && get_bits_left(gb) < 8) {// we have only padding left
|
|
c->last_bits_used = buf_size << 3;
|
|
}
|
|
|
|
*got_frame_ptr = 1;
|
|
|
|
return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
|
|
}
|
|
|
|
static av_cold void mpc8_decode_flush(AVCodecContext *avctx)
|
|
{
|
|
MPCContext *c = avctx->priv_data;
|
|
c->cur_frame = 0;
|
|
}
|
|
|
|
AVCodec ff_mpc8_decoder = {
|
|
.name = "mpc8",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"),
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.id = AV_CODEC_ID_MUSEPACK8,
|
|
.priv_data_size = sizeof(MPCContext),
|
|
.init = mpc8_decode_init,
|
|
.decode = mpc8_decode_frame,
|
|
.flush = mpc8_decode_flush,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
|
|
AV_SAMPLE_FMT_NONE },
|
|
};
|