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truespeech: simplify truespeech_read_frame() by using get_bits()

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This commit is contained in:
Justin Ruggles 2011-10-13 00:17:05 -04:00
parent 5e5ce70f19
commit b84048935e
1 changed files with 43 additions and 78 deletions
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121
libavcodec/truespeech.c
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@ -21,6 +21,8 @@
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "dsputil.h"
#include "get_bits.h"
#include "truespeech_data.h"
/**
@ -32,7 +34,9 @@
* TrueSpeech decoder context
*/
typedef struct {
DSPContext dsp;
/* input data */
uint8_t buffer[32];
int16_t vector[8]; ///< input vector: 5/5/4/4/4/3/3/3
int offset1[2]; ///< 8-bit value, used in one copying offset
int offset2[4]; ///< 7-bit value, encodes offsets for copying and for two-point filter
@ -54,7 +58,7 @@ typedef struct {
static av_cold int truespeech_decode_init(AVCodecContext * avctx)
{
// TSContext *c = avctx->priv_data;
TSContext *c = avctx->priv_data;
if (avctx->channels != 1) {
av_log_ask_for_sample(avctx, "Unsupported channel count: %d\n", avctx->channels);
@ -62,97 +66,58 @@ static av_cold int truespeech_decode_init(AVCodecContext * avctx)
}
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
dsputil_init(&c->dsp, avctx);
return 0;
}
static void truespeech_read_frame(TSContext *dec, const uint8_t *input)
{
uint32_t t;
GetBitContext gb;
/* first dword */
t = AV_RL32(input);
input += 4;
dec->dsp.bswap_buf((uint32_t *)dec->buffer, (const uint32_t *)input, 8);
init_get_bits(&gb, dec->buffer, 32 * 8);
dec->flag = t & 1;
dec->vector[7] = ts_codebook[7][get_bits(&gb, 3)];
dec->vector[6] = ts_codebook[6][get_bits(&gb, 3)];
dec->vector[5] = ts_codebook[5][get_bits(&gb, 3)];
dec->vector[4] = ts_codebook[4][get_bits(&gb, 4)];
dec->vector[3] = ts_codebook[3][get_bits(&gb, 4)];
dec->vector[2] = ts_codebook[2][get_bits(&gb, 4)];
dec->vector[1] = ts_codebook[1][get_bits(&gb, 5)];
dec->vector[0] = ts_codebook[0][get_bits(&gb, 5)];
dec->flag = get_bits1(&gb);
dec->vector[0] = ts_codebook[0][(t >> 1) & 0x1F];
dec->vector[1] = ts_codebook[1][(t >> 6) & 0x1F];
dec->vector[2] = ts_codebook[2][(t >> 11) & 0xF];
dec->vector[3] = ts_codebook[3][(t >> 15) & 0xF];
dec->vector[4] = ts_codebook[4][(t >> 19) & 0xF];
dec->vector[5] = ts_codebook[5][(t >> 23) & 0x7];
dec->vector[6] = ts_codebook[6][(t >> 26) & 0x7];
dec->vector[7] = ts_codebook[7][(t >> 29) & 0x7];
dec->offset1[0] = get_bits(&gb, 4) << 4;
dec->offset2[3] = get_bits(&gb, 7);
dec->offset2[2] = get_bits(&gb, 7);
dec->offset2[1] = get_bits(&gb, 7);
dec->offset2[0] = get_bits(&gb, 7);
/* second dword */
t = AV_RL32(input);
input += 4;
dec->offset1[1] = get_bits(&gb, 4);
dec->pulseval[1] = get_bits(&gb, 14);
dec->pulseval[0] = get_bits(&gb, 14);
dec->offset2[0] = (t >> 0) & 0x7F;
dec->offset2[1] = (t >> 7) & 0x7F;
dec->offset2[2] = (t >> 14) & 0x7F;
dec->offset2[3] = (t >> 21) & 0x7F;
dec->offset1[1] |= get_bits(&gb, 4) << 4;
dec->pulseval[3] = get_bits(&gb, 14);
dec->pulseval[2] = get_bits(&gb, 14);
dec->offset1[0] = ((t >> 28) & 0xF) << 4;
dec->offset1[0] |= get_bits1(&gb);
dec->pulsepos[0] = get_bits_long(&gb, 27);
dec->pulseoff[0] = get_bits(&gb, 4);
/* third dword */
t = AV_RL32(input);
input += 4;
dec->offset1[0] |= get_bits1(&gb) << 1;
dec->pulsepos[1] = get_bits_long(&gb, 27);
dec->pulseoff[1] = get_bits(&gb, 4);
dec->pulseval[0] = (t >> 0) & 0x3FFF;
dec->pulseval[1] = (t >> 14) & 0x3FFF;
dec->offset1[1] = (t >> 28) & 0x0F;
/* fourth dword */
t = AV_RL32(input);
input += 4;
dec->pulseval[2] = (t >> 0) & 0x3FFF;
dec->pulseval[3] = (t >> 14) & 0x3FFF;
dec->offset1[1] |= ((t >> 28) & 0x0F) << 4;
/* fifth dword */
t = AV_RL32(input);
input += 4;
dec->pulsepos[0] = (t >> 4) & 0x7FFFFFF;
dec->pulseoff[0] = (t >> 0) & 0xF;
dec->offset1[0] |= (t >> 31) & 1;
/* sixth dword */
t = AV_RL32(input);
input += 4;
dec->pulsepos[1] = (t >> 4) & 0x7FFFFFF;
dec->pulseoff[1] = (t >> 0) & 0xF;
dec->offset1[0] |= ((t >> 31) & 1) << 1;
/* seventh dword */
t = AV_RL32(input);
input += 4;
dec->pulsepos[2] = (t >> 4) & 0x7FFFFFF;
dec->pulseoff[2] = (t >> 0) & 0xF;
dec->offset1[0] |= ((t >> 31) & 1) << 2;
/* eighth dword */
t = AV_RL32(input);
input += 4;
dec->pulsepos[3] = (t >> 4) & 0x7FFFFFF;
dec->pulseoff[3] = (t >> 0) & 0xF;
dec->offset1[0] |= ((t >> 31) & 1) << 3;
dec->offset1[0] |= get_bits1(&gb) << 2;
dec->pulsepos[2] = get_bits_long(&gb, 27);
dec->pulseoff[2] = get_bits(&gb, 4);
dec->offset1[0] |= get_bits1(&gb) << 3;
dec->pulsepos[3] = get_bits_long(&gb, 27);
dec->pulseoff[3] = get_bits(&gb, 4);
}
static void truespeech_correlate_filter(TSContext *dec)