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Code Issues Releases Activity

amrnb/amrwb: Remove get_bits usage.

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It is used to parse fixed sized fields out of a single octet. The code
is simpler without it.
This commit is contained in:
Alex Converse 2012-03-04 17:24:38 -08:00
parent 94cf64b81f
commit b70feb4053
2 changed files with 4 additions and 16 deletions
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10
libavcodec/amrnbdec.c
View File

@ -44,7 +44,6 @@
#include <math.h>
#include "avcodec.h"
#include "get_bits.h"
#include "libavutil/common.h"
#include "celp_math.h"
#include "celp_filters.h"
@ -189,16 +188,11 @@ static av_cold int amrnb_decode_init(AVCodecContext *avctx)
static enum Mode unpack_bitstream(AMRContext *p, const uint8_t *buf,
int buf_size)
{
GetBitContext gb;
enum Mode mode;
init_get_bits(&gb, buf, buf_size * 8);
// Decode the first octet.
skip_bits(&gb, 1); // padding bit
mode = get_bits(&gb, 4); // frame type
p->bad_frame_indicator = !get_bits1(&gb); // quality bit
skip_bits(&gb, 2); // two padding bits
mode = buf[0] >> 3 & 0x0F; // frame type
p->bad_frame_indicator = (buf[0] & 0x4) != 0x4; // quality bit
if (mode >= N_MODES || buf_size < frame_sizes_nb[mode] + 1) {
return NO_DATA;

10
libavcodec/amrwbdec.c
View File

@ -27,7 +27,6 @@
#include "libavutil/lfg.h"
#include "avcodec.h"
#include "get_bits.h"
#include "lsp.h"
#include "celp_math.h"
#include "celp_filters.h"
@ -120,14 +119,9 @@ static av_cold int amrwb_decode_init(AVCodecContext *avctx)
*/
static int decode_mime_header(AMRWBContext *ctx, const uint8_t *buf)
{
GetBitContext gb;
init_get_bits(&gb, buf, 8);
/* Decode frame header (1st octet) */
skip_bits(&gb, 1); // padding bit
ctx->fr_cur_mode = get_bits(&gb, 4);
ctx->fr_quality = get_bits1(&gb);
skip_bits(&gb, 2); // padding bits
ctx->fr_cur_mode = buf[0] >> 3 & 0x0F;
ctx->fr_quality = (buf[0] & 0x4) != 0x4;
return 1;
}