mirror of
https://github.com/nyanmisaka/ffmpeg-rockchip.git
synced 2025-10-31 20:42:49 +08:00
298 lines
10 KiB
C
298 lines
10 KiB
C
/*
|
|
* Musepack SV7 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 libavcodec/mpc7.c Musepack SV7 decoder
|
|
* MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
|
|
* divided into 32 subbands.
|
|
*/
|
|
|
|
#include "libavutil/lfg.h"
|
|
#include "avcodec.h"
|
|
#include "get_bits.h"
|
|
#include "dsputil.h"
|
|
#include "mpegaudio.h"
|
|
|
|
#include "mpc.h"
|
|
#include "mpc7data.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 const uint16_t quant_offsets[MPC7_QUANT_VLC_TABLES*2 + 1] =
|
|
{
|
|
0, 512, 1024, 1536, 2052, 2564, 3076, 3588, 4100, 4612, 5124,
|
|
5636, 6164, 6676, 7224
|
|
};
|
|
|
|
|
|
static av_cold int mpc7_decode_init(AVCodecContext * avctx)
|
|
{
|
|
int i, j;
|
|
MPCContext *c = avctx->priv_data;
|
|
GetBitContext gb;
|
|
uint8_t buf[16];
|
|
static int vlc_initialized = 0;
|
|
|
|
static VLC_TYPE scfi_table[1 << MPC7_SCFI_BITS][2];
|
|
static VLC_TYPE dscf_table[1 << MPC7_DSCF_BITS][2];
|
|
static VLC_TYPE hdr_table[1 << MPC7_HDR_BITS][2];
|
|
static VLC_TYPE quant_tables[7224][2];
|
|
|
|
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));
|
|
av_lfg_init(&c->rnd, 0xDEADBEEF);
|
|
dsputil_init(&c->dsp, avctx);
|
|
c->dsp.bswap_buf((uint32_t*)buf, (const uint32_t*)avctx->extradata, 4);
|
|
ff_mpc_init();
|
|
init_get_bits(&gb, buf, 128);
|
|
|
|
c->IS = get_bits1(&gb);
|
|
c->MSS = get_bits1(&gb);
|
|
c->maxbands = get_bits(&gb, 6);
|
|
if(c->maxbands >= BANDS){
|
|
av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands);
|
|
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->maxbands);
|
|
c->frames_to_skip = 0;
|
|
|
|
if(vlc_initialized) return 0;
|
|
av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
|
|
scfi_vlc.table = scfi_table;
|
|
scfi_vlc.table_allocated = 1 << MPC7_SCFI_BITS;
|
|
if(init_vlc(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
|
|
&mpc7_scfi[1], 2, 1,
|
|
&mpc7_scfi[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
|
|
av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n");
|
|
return -1;
|
|
}
|
|
dscf_vlc.table = dscf_table;
|
|
dscf_vlc.table_allocated = 1 << MPC7_DSCF_BITS;
|
|
if(init_vlc(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
|
|
&mpc7_dscf[1], 2, 1,
|
|
&mpc7_dscf[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
|
|
av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n");
|
|
return -1;
|
|
}
|
|
hdr_vlc.table = hdr_table;
|
|
hdr_vlc.table_allocated = 1 << MPC7_HDR_BITS;
|
|
if(init_vlc(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
|
|
&mpc7_hdr[1], 2, 1,
|
|
&mpc7_hdr[0], 2, 1, INIT_VLC_USE_NEW_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++){
|
|
quant_vlc[i][j].table = &quant_tables[quant_offsets[i*2 + j]];
|
|
quant_vlc[i][j].table_allocated = quant_offsets[i*2 + j + 1] - quant_offsets[i*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_NEW_STATIC)){
|
|
av_log(avctx, AV_LOG_ERROR, "Cannot init QUANT VLC %i,%i\n",i,j);
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
vlc_initialized = 1;
|
|
avctx->sample_fmt = SAMPLE_FMT_S16;
|
|
avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Fill samples for given subband
|
|
*/
|
|
static inline void 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++){
|
|
*dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
|
|
}
|
|
break;
|
|
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++ = mpc7_idx30[t];
|
|
*dst++ = mpc7_idx31[t];
|
|
*dst++ = mpc7_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++ = mpc7_idx50[t];
|
|
*dst++ = mpc7_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,
|
|
AVPacket *avpkt)
|
|
{
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
MPCContext *c = avctx->priv_data;
|
|
GetBitContext gb;
|
|
uint8_t *bits;
|
|
int i, ch, t;
|
|
int mb = -1;
|
|
Band *bands = c->bands;
|
|
int off;
|
|
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) + FF_INPUT_BUFFER_PADDING_SIZE);
|
|
c->dsp.bswap_buf((uint32_t*)bits, (const uint32_t*)(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->maxbands; 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(c->Q, 0, sizeof(c->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], c->Q[ch] + off);
|
|
|
|
ff_mpc_dequantize_and_synth(c, mb, 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 = {
|
|
"mpc7",
|
|
CODEC_TYPE_AUDIO,
|
|
CODEC_ID_MUSEPACK7,
|
|
sizeof(MPCContext),
|
|
mpc7_decode_init,
|
|
NULL,
|
|
NULL,
|
|
mpc7_decode_frame,
|
|
.flush = mpc7_decode_flush,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Musepack SV7"),
|
|
};
|