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Viewing changes to gst-libs/ext/libav/libavcodec/arm/ac3dsp_armv6.S

  • Committer: Package Import Robot
  • Author(s): Sebastian Dröge
  • Date: 2013-09-24 17:07:00 UTC
  • mfrom: (1.1.17) (7.1.9 experimental)
  • Revision ID: package-import@ubuntu.com-20130924170700-4dg62s3pwl0pdakz
Tags: 1.2.0-1
* New upstream stable release:
  + debian/control:
    - Build depend on GStreamer and gst-plugins-base >= 1.2.0.

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gst-libs/ext/libav/libavcodec/arm/ac3dsp_armv6.S
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "asm.S"
 
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#include "libavutil/arm/asm.S"
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function ff_ac3_bit_alloc_calc_bap_armv6, export=1
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        ldr             r12, [sp]
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        beq             4f
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        push            {r4-r11,lr}
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        add             r5,  sp,  #40
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        movrel          r4,  X(ff_ac3_bin_to_band_tab)
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        movrel          lr,  X(ff_ac3_band_start_tab)
 
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        movrelx         r4,  X(ff_ac3_bin_to_band_tab), r11
 
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        movrelx         lr,  X(ff_ac3_band_start_tab)
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        ldm             r5,  {r5-r7}
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        ldrb            r4,  [r4, r2]
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        add             r1,  r1,  r2,  lsl #1           @ psd + start
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        add             r0,  r0,  r4,  lsl #1           @ mask + band
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        add             r4,  lr,  r4
 
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        add             r4,  r4,  lr
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        add             r7,  r7,  r2                    @ bap + start
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        ldrb            r10, [r4], #1
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1:
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        ldrsh           r9,  [r0], #2                   @ mask[band]
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        mov             r8,  #0xff0
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        sub             r9,  r9,  r12                   @   - snr_offset
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        mov             r11, r10
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        ldrb            r10, [r4], #1                   @ band_start_tab[band++]
 
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        ldrb            r10, [r4, #1]!                  @ band_start_tab[++band]
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        subs            r9,  r9,  r5                    @   - floor
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        it              lt
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        movlt           r9,  #0
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        cmp             r10, r3                         @   - end
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        and             r9,  r9,  r8, lsl #1            @   & 0x1fe0
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        ite             gt
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        subgt           r8,  r3,  r11
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        suble           r8,  r10, r11
 
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        subgt           r8,  r3,  r2
 
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        suble           r8,  r10, r2
 
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        mov             r2,  r10
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        add             r9,  r9,  r5                    @   + floor => m
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        tst             r8,  #1
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        add             r2,  r7,  r8
 
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        add             r11, r7,  r8
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        bne             3f
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        b               5f
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2:
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        ldrb            lr,  [r6, lr]
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        strb            r8,  [r7], #1                   @ bap[bin]
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        strb            lr,  [r7], #1
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5:      cmp             r7,  r2
 
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5:      cmp             r7,  r11
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        blo             2b
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        cmp             r3,  r11
 
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        cmp             r3,  r10
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        bgt             1b
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        pop             {r4-r11,pc}
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