mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
361 lines
12 KiB
361 lines
12 KiB
/* |
|
* Musepack decoder |
|
* Copyright (c) 2006 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 mpc.c Musepack decoder |
|
* MPEG Audio Layer 1/2 -like codec with frames of 1152 samples |
|
* divided into 32 subbands. |
|
*/ |
|
|
|
#include "avcodec.h" |
|
#include "bitstream.h" |
|
#include "dsputil.h" |
|
|
|
#ifdef CONFIG_MPEGAUDIO_HP |
|
#define USE_HIGHPRECISION |
|
#endif |
|
#include "mpegaudio.h" |
|
|
|
#include "mpcdata.h" |
|
|
|
#define BANDS 32 |
|
#define SAMPLES_PER_BAND 36 |
|
#define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND) |
|
|
|
static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2]; |
|
|
|
static DECLARE_ALIGNED_16(MPA_INT, mpa_window[512]); |
|
|
|
typedef struct { |
|
DSPContext dsp; |
|
int IS, MSS, gapless; |
|
int lastframelen, bands; |
|
int oldDSCF[2][BANDS]; |
|
int rnd; |
|
int frames_to_skip; |
|
/* for synthesis */ |
|
DECLARE_ALIGNED_16(MPA_INT, synth_buf[MPA_MAX_CHANNELS][512*2]); |
|
int synth_buf_offset[MPA_MAX_CHANNELS]; |
|
DECLARE_ALIGNED_16(int32_t, sb_samples[MPA_MAX_CHANNELS][36][SBLIMIT]); |
|
} MPCContext; |
|
|
|
/** Subband structure - hold all variables for each subband */ |
|
typedef struct { |
|
int msf; ///< mid-stereo flag |
|
int res[2]; |
|
int scfi[2]; |
|
int scf_idx[2][3]; |
|
int Q[2]; |
|
}Band; |
|
|
|
static int mpc7_decode_init(AVCodecContext * avctx) |
|
{ |
|
int i, j; |
|
MPCContext *c = avctx->priv_data; |
|
GetBitContext gb; |
|
uint8_t buf[16]; |
|
float f1=1.20050805774840750476 * 256; |
|
static int vlc_inited = 0; |
|
|
|
if(avctx->extradata_size < 16){ |
|
av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size); |
|
return -1; |
|
} |
|
memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); |
|
c->rnd = 0xDEADBEEF; |
|
dsputil_init(&c->dsp, avctx); |
|
c->dsp.bswap_buf(buf, avctx->extradata, 4); |
|
ff_mpa_synth_init(mpa_window); |
|
init_get_bits(&gb, buf, 128); |
|
|
|
c->IS = get_bits1(&gb); |
|
c->MSS = get_bits1(&gb); |
|
c->bands = get_bits(&gb, 6); |
|
if(c->bands >= BANDS){ |
|
av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->bands); |
|
return -1; |
|
} |
|
skip_bits(&gb, 88); |
|
c->gapless = get_bits1(&gb); |
|
c->lastframelen = get_bits(&gb, 11); |
|
av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n", |
|
c->IS, c->MSS, c->gapless, c->lastframelen, c->bands); |
|
c->frames_to_skip = 0; |
|
|
|
if(vlc_inited) return 0; |
|
av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n"); |
|
if(init_vlc(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE, |
|
&mpc7_scfi[1], 2, 1, |
|
&mpc7_scfi[0], 2, 1, INIT_VLC_USE_STATIC)){ |
|
av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n"); |
|
return -1; |
|
} |
|
if(init_vlc(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE, |
|
&mpc7_dscf[1], 2, 1, |
|
&mpc7_dscf[0], 2, 1, INIT_VLC_USE_STATIC)){ |
|
av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n"); |
|
return -1; |
|
} |
|
if(init_vlc(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE, |
|
&mpc7_hdr[1], 2, 1, |
|
&mpc7_hdr[0], 2, 1, INIT_VLC_USE_STATIC)){ |
|
av_log(avctx, AV_LOG_ERROR, "Cannot init HDR VLC\n"); |
|
return -1; |
|
} |
|
for(i = 0; i < MPC7_QUANT_VLC_TABLES; i++){ |
|
for(j = 0; j < 2; j++){ |
|
if(init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i], |
|
&mpc7_quant_vlc[i][j][1], 4, 2, |
|
&mpc7_quant_vlc[i][j][0], 4, 2, INIT_VLC_USE_STATIC)){ |
|
av_log(avctx, AV_LOG_ERROR, "Cannot init QUANT VLC %i,%i\n",i,j); |
|
return -1; |
|
} |
|
} |
|
} |
|
vlc_inited = 1; |
|
return 0; |
|
} |
|
|
|
// XXX replace with something better |
|
static int av_always_inline mpc_rnd(MPCContext *c) |
|
{ |
|
c->rnd = c->rnd * 27 + 17; |
|
return c->rnd; |
|
} |
|
|
|
/** |
|
* Process decoded Musepack data and produce PCM |
|
* @todo make it available for MPC8 and MPC6 |
|
*/ |
|
static void mpc_synth(MPCContext *c, int16_t *out) |
|
{ |
|
int dither_state = 0; |
|
int i, ch; |
|
OUT_INT samples[MPA_MAX_CHANNELS * MPA_FRAME_SIZE], *samples_ptr; |
|
|
|
for(ch = 0; ch < 2; ch++){ |
|
samples_ptr = samples + ch; |
|
for(i = 0; i < SAMPLES_PER_BAND; i++) { |
|
ff_mpa_synth_filter(c->synth_buf[ch], &(c->synth_buf_offset[ch]), |
|
mpa_window, &dither_state, |
|
samples_ptr, 2, |
|
c->sb_samples[ch][i]); |
|
samples_ptr += 64; |
|
} |
|
} |
|
for(i = 0; i < MPC_FRAME_SIZE*2; i++) |
|
*out++=samples[i]; |
|
} |
|
|
|
/** |
|
* Fill samples for given subband |
|
*/ |
|
static void inline idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst) |
|
{ |
|
int i, i1, t; |
|
switch(idx){ |
|
case -1: |
|
for(i = 0; i < SAMPLES_PER_BAND; i++){ |
|
t = mpc_rnd(c); |
|
*dst++ = ((t>>24)& 0xFF) + ((t>>16) & 0xFF) + ((t>>8) & 0xFF) + (t & 0xFF) - 510; |
|
} |
|
case 1: |
|
i1 = get_bits1(gb); |
|
for(i = 0; i < SAMPLES_PER_BAND/3; i++){ |
|
t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2); |
|
*dst++ = mpc_idx30[t]; |
|
*dst++ = mpc_idx31[t]; |
|
*dst++ = mpc_idx32[t]; |
|
} |
|
break; |
|
case 2: |
|
i1 = get_bits1(gb); |
|
for(i = 0; i < SAMPLES_PER_BAND/2; i++){ |
|
t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2); |
|
*dst++ = mpc_idx50[t]; |
|
*dst++ = mpc_idx51[t]; |
|
} |
|
break; |
|
case 3: case 4: case 5: case 6: case 7: |
|
i1 = get_bits1(gb); |
|
for(i = 0; i < SAMPLES_PER_BAND; i++) |
|
*dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2) - mpc7_quant_vlc_off[idx-1]; |
|
break; |
|
case 8: case 9: case 10: case 11: case 12: |
|
case 13: case 14: case 15: case 16: case 17: |
|
t = (1 << (idx - 2)) - 1; |
|
for(i = 0; i < SAMPLES_PER_BAND; i++) |
|
*dst++ = get_bits(gb, idx - 1) - t; |
|
break; |
|
default: // case 0 and -2..-17 |
|
return; |
|
} |
|
} |
|
|
|
static int mpc7_decode_frame(AVCodecContext * avctx, |
|
void *data, int *data_size, |
|
uint8_t * buf, int buf_size) |
|
{ |
|
MPCContext *c = avctx->priv_data; |
|
GetBitContext gb; |
|
uint8_t *bits; |
|
int i, j, ch, t; |
|
int mb = -1; |
|
Band bands[BANDS]; |
|
int Q[2][MPC_FRAME_SIZE]; |
|
int off; |
|
float mul; |
|
int bits_used, bits_avail; |
|
|
|
memset(bands, 0, sizeof(bands)); |
|
if(buf_size <= 4){ |
|
av_log(avctx, AV_LOG_ERROR, "Too small buffer passed (%i bytes)\n", buf_size); |
|
} |
|
|
|
bits = av_malloc((buf_size - 1) & ~3); |
|
c->dsp.bswap_buf(bits, buf + 4, (buf_size - 4) >> 2); |
|
init_get_bits(&gb, bits, (buf_size - 4)* 8); |
|
skip_bits(&gb, buf[0]); |
|
|
|
/* read subband indexes */ |
|
for(i = 0; i <= c->bands; i++){ |
|
for(ch = 0; ch < 2; ch++){ |
|
if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5; |
|
if(!i || (t == 4)) bands[i].res[ch] = get_bits(&gb, 4); |
|
else bands[i].res[ch] = bands[i-1].res[ch] + t; |
|
} |
|
|
|
if(bands[i].res[0] || bands[i].res[1]){ |
|
mb = i; |
|
if(c->MSS) bands[i].msf = get_bits1(&gb); |
|
} |
|
} |
|
/* get scale indexes coding method */ |
|
for(i = 0; i <= mb; i++) |
|
for(ch = 0; ch < 2; ch++) |
|
if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1); |
|
/* get scale indexes */ |
|
for(i = 0; i <= mb; i++){ |
|
for(ch = 0; ch < 2; ch++){ |
|
if(bands[i].res[ch]){ |
|
bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i]; |
|
t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; |
|
bands[i].scf_idx[ch][0] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][2] + t); |
|
switch(bands[i].scfi[ch]){ |
|
case 0: |
|
t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; |
|
bands[i].scf_idx[ch][1] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][0] + t); |
|
t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; |
|
bands[i].scf_idx[ch][2] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][1] + t); |
|
break; |
|
case 1: |
|
t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; |
|
bands[i].scf_idx[ch][1] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][0] + t); |
|
bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1]; |
|
break; |
|
case 2: |
|
bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0]; |
|
t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; |
|
bands[i].scf_idx[ch][2] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][1] + t); |
|
break; |
|
case 3: |
|
bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0]; |
|
break; |
|
} |
|
c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2]; |
|
} |
|
} |
|
} |
|
/* get quantizers */ |
|
memset(Q, 0, sizeof(Q)); |
|
off = 0; |
|
for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND) |
|
for(ch = 0; ch < 2; ch++) |
|
idx_to_quant(c, &gb, bands[i].res[ch], Q[ch] + off); |
|
/* dequantize */ |
|
memset(c->sb_samples, 0, sizeof(c->sb_samples)); |
|
off = 0; |
|
for(i = 0; i <= mb; i++, off += SAMPLES_PER_BAND){ |
|
for(ch = 0; ch < 2; ch++){ |
|
if(bands[i].res[ch]){ |
|
j = 0; |
|
mul = mpc_CC[bands[i].res[ch]] * mpc7_SCF[bands[i].scf_idx[ch][0]]; |
|
for(; j < 12; j++) |
|
c->sb_samples[ch][j][i] = mul * Q[ch][j + off]; |
|
mul = mpc_CC[bands[i].res[ch]] * mpc7_SCF[bands[i].scf_idx[ch][1]]; |
|
for(; j < 24; j++) |
|
c->sb_samples[ch][j][i] = mul * Q[ch][j + off]; |
|
mul = mpc_CC[bands[i].res[ch]] * mpc7_SCF[bands[i].scf_idx[ch][2]]; |
|
for(; j < 36; j++) |
|
c->sb_samples[ch][j][i] = mul * Q[ch][j + off]; |
|
} |
|
} |
|
if(bands[i].msf){ |
|
int t1, t2; |
|
for(j = 0; j < SAMPLES_PER_BAND; j++){ |
|
t1 = c->sb_samples[0][j][i]; |
|
t2 = c->sb_samples[1][j][i]; |
|
c->sb_samples[0][j][i] = t1 + t2; |
|
c->sb_samples[1][j][i] = t1 - t2; |
|
} |
|
} |
|
} |
|
|
|
mpc_synth(c, data); |
|
|
|
av_free(bits); |
|
|
|
bits_used = get_bits_count(&gb); |
|
bits_avail = (buf_size - 4) * 8; |
|
if(!buf[1] && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))){ |
|
av_log(NULL,0, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail); |
|
return -1; |
|
} |
|
if(c->frames_to_skip){ |
|
c->frames_to_skip--; |
|
*data_size = 0; |
|
return buf_size; |
|
} |
|
*data_size = (buf[1] ? c->lastframelen : MPC_FRAME_SIZE) * 4; |
|
|
|
return buf_size; |
|
} |
|
|
|
static void mpc7_decode_flush(AVCodecContext *avctx) |
|
{ |
|
MPCContext *c = avctx->priv_data; |
|
|
|
memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); |
|
c->frames_to_skip = 32; |
|
} |
|
|
|
AVCodec mpc7_decoder = { |
|
"mpc sv7", |
|
CODEC_TYPE_AUDIO, |
|
CODEC_ID_MUSEPACK7, |
|
sizeof(MPCContext), |
|
mpc7_decode_init, |
|
NULL, |
|
NULL, |
|
mpc7_decode_frame, |
|
.flush = mpc7_decode_flush, |
|
};
|
|
|