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/*
* 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
*/
/** |
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* @file |
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* MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
* divided into 32 subbands.
*/
|
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#include "libavutil/lfg.h" |
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#include "avcodec.h" |
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#include "get_bits.h" |
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#include "dsputil.h" |
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#include "mpegaudiodsp.h" |
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#include "libavutil/audioconvert.h" |
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#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];
|
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static const uint16_t quant_offsets[MPC7_QUANT_VLC_TABLES*2 + 1] = |
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{
0, 512, 1024, 1536, 2052, 2564, 3076, 3588, 4100, 4612, 5124,
5636, 6164, 6676, 7224
};
|
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static av_cold int mpc7_decode_init(AVCodecContext * avctx) |
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{
int i, j;
MPCContext *c = avctx->priv_data;
GetBitContext gb;
uint8_t buf[16]; |
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static int vlc_initialized = 0; |
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|
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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];
|
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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)); |
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av_lfg_init(&c->rnd, 0xDEADBEEF); |
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dsputil_init(&c->dsp, avctx); |
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ff_mpadsp_init(&c->mpadsp); |
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c->dsp.bswap_buf((uint32_t*)buf, (const uint32_t*)avctx->extradata, 4); |
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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;
} |
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skip_bits_long(&gb, 88); |
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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;
|
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avctx->sample_fmt = AV_SAMPLE_FMT_S16; |
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avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO; |
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|
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if(vlc_initialized) return 0; |
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av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n"); |
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scfi_vlc.table = scfi_table;
scfi_vlc.table_allocated = 1 << MPC7_SCFI_BITS; |
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if(init_vlc(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
&mpc7_scfi[1], 2, 1, |
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&mpc7_scfi[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){ |
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av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n");
return -1;
} |
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dscf_vlc.table = dscf_table;
dscf_vlc.table_allocated = 1 << MPC7_DSCF_BITS; |
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if(init_vlc(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
&mpc7_dscf[1], 2, 1, |
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&mpc7_dscf[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){ |
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av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n");
return -1;
} |
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hdr_vlc.table = hdr_table;
hdr_vlc.table_allocated = 1 << MPC7_HDR_BITS; |
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if(init_vlc(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
&mpc7_hdr[1], 2, 1, |
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&mpc7_hdr[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){ |
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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++){ |
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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]; |
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if(init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i],
&mpc7_quant_vlc[i][j][1], 4, 2, |
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&mpc7_quant_vlc[i][j][0], 4, 2, INIT_VLC_USE_NEW_STATIC)){ |
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av_log(avctx, AV_LOG_ERROR, "Cannot init QUANT VLC %i,%i\n",i,j);
return -1;
}
}
} |
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vlc_initialized = 1; |
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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++){ |
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*dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510; |
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}
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;
}
}
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static int get_scale_idx(GetBitContext *gb, int ref)
{
int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;
if (t == 8)
return get_bits(gb, 6);
return ref + t;
}
|
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static int mpc7_decode_frame(AVCodecContext * avctx,
void *data, int *data_size, |
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AVPacket *avpkt) |
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{ |
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const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size; |
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MPCContext *c = avctx->priv_data;
GetBitContext gb;
uint8_t *bits; |
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int i, ch; |
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int mb = -1;
Band *bands = c->bands; |
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int off, out_size; |
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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); |
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return AVERROR(EINVAL); |
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}
|
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out_size = (buf[1] ? c->lastframelen : MPC_FRAME_SIZE) * 4;
if (*data_size < out_size) {
av_log(avctx, AV_LOG_ERROR, "Output buffer is too small\n");
return AVERROR(EINVAL);
}
|
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bits = av_malloc(((buf_size - 1) & ~3) + FF_INPUT_BUFFER_PADDING_SIZE); |
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c->dsp.bswap_buf((uint32_t*)bits, (const uint32_t*)(buf + 4), (buf_size - 4) >> 2); |
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init_get_bits(&gb, bits, (buf_size - 4)* 8); |
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skip_bits_long(&gb, buf[0]); |
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/* read subband indexes */
for(i = 0; i <= c->maxbands; i++){
for(ch = 0; ch < 2; ch++){ |
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int t = 4; |
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if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5; |
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if(t == 4) bands[i].res[ch] = get_bits(&gb, 4); |
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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]; |
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bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]); |
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switch(bands[i].scfi[ch]){
case 0: |
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bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]); |
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break;
case 1: |
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bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]); |
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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]; |
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bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]); |
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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);
|
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ff_mpc_dequantize_and_synth(c, mb, data, 2); |
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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;
} |
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*data_size = out_size; |
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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;
}
|
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AVCodec ff_mpc7_decoder = { |
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"mpc7", |
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AVMEDIA_TYPE_AUDIO, |
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CODEC_ID_MUSEPACK7,
sizeof(MPCContext),
mpc7_decode_init,
NULL,
NULL,
mpc7_decode_frame,
.flush = mpc7_decode_flush, |
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.long_name = NULL_IF_CONFIG_SMALL("Musepack SV7"), |
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}; |