/*
- * Musepack decoder
+ * Musepack decoder core
* Copyright (c) 2006 Konstantin Shishkov
*
* This file is part of FFmpeg.
* 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
+ * @file
+ * Musepack decoder core
* MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
* divided into 32 subbands.
*/
#include "avcodec.h"
-#include "bitstream.h"
+#include "get_bits.h"
#include "dsputil.h"
-
-#ifdef CONFIG_MPEGAUDIO_HP
-#define USE_HIGHPRECISION
-#endif
#include "mpegaudio.h"
+#include "mpc.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)
+void ff_mpc_init(void)
{
- 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;
+ ff_mpa_synth_init(ff_mpa_synth_window);
}
/**
* Process decoded Musepack data and produce PCM
- * @todo make it available for MPC8 and MPC6
*/
-static void mpc_synth(MPCContext *c, int16_t *out)
+static void mpc_synth(MPCContext *c, int16_t *out, int channels)
{
int dither_state = 0;
int i, ch;
OUT_INT samples[MPA_MAX_CHANNELS * MPA_FRAME_SIZE], *samples_ptr;
- for(ch = 0; ch < 2; ch++){
+ for(ch = 0; ch < channels; 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,
+ ff_mpa_synth_window, &dither_state,
+ samples_ptr, channels,
c->sb_samples[ch][i]);
- samples_ptr += 64;
+ samples_ptr += 32 * channels;
}
}
- for(i = 0; i < MPC_FRAME_SIZE*2; i++)
+ for(i = 0; i < MPC_FRAME_SIZE*channels; 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;
- }
- 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++ = 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)
+void ff_mpc_dequantize_and_synth(MPCContext * c, int maxband, void *data, int channels)
{
- 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 i, j, ch;
+ Band *bands = c->bands;
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) + FF_INPUT_BUFFER_PADDING_SIZE);
- 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(i = 0; i <= maxband; 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]];
+ mul = mpc_CC[bands[i].res[ch]] * mpc_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]];
+ c->sb_samples[ch][j][i] = mul * c->Q[ch][j + off];
+ mul = mpc_CC[bands[i].res[ch]] * mpc_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]];
+ c->sb_samples[ch][j][i] = mul * c->Q[ch][j + off];
+ mul = mpc_CC[bands[i].res[ch]] * mpc_SCF[bands[i].scf_idx[ch][2]];
for(; j < 36; j++)
- c->sb_samples[ch][j][i] = mul * Q[ch][j + off];
+ c->sb_samples[ch][j][i] = mul * c->Q[ch][j + off];
}
}
if(bands[i].msf){
}
}
- 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;
+ mpc_synth(c, data, channels);
}
-
-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,
-};