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c46b63d44e
Use the first _gst_reserved[] slot to hold the built-in range decoder private data. The first slot was formerly the buffer size, which was then promoted to semi-public namespace when it got integrated as git commit 2940ac6. Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
/*
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* gstvp8rangedecoder.c - VP8 range decoder interface
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "gstvp8rangedecoder.h"
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#include "dboolhuff.h"
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#define BOOL_DECODER_CAST(rd) \
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((BOOL_DECODER *)(&(rd)->_gst_reserved[0]))
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gboolean
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gst_vp8_range_decoder_init (GstVp8RangeDecoder * rd, const guchar * buf,
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guint buf_size)
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{
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BOOL_DECODER *const bd = BOOL_DECODER_CAST (rd);
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g_return_val_if_fail (sizeof (rd->_gst_reserved) >= sizeof (*bd), FALSE);
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rd->buf = buf;
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rd->buf_size = buf_size;
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return vp8dx_start_decode (bd, buf, buf_size, NULL, NULL) == 0;
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}
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gint
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gst_vp8_range_decoder_read (GstVp8RangeDecoder * rd, guint8 prob)
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{
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return vp8dx_decode_bool (BOOL_DECODER_CAST (rd), prob);
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}
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gint
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gst_vp8_range_decoder_read_literal (GstVp8RangeDecoder * rd, gint bits)
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{
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return vp8_decode_value (BOOL_DECODER_CAST (rd), bits);
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}
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guint
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gst_vp8_range_decoder_get_pos (GstVp8RangeDecoder * rd)
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{
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BOOL_DECODER *const bd = BOOL_DECODER_CAST (rd);
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return (bd->user_buffer - rd->buf) * 8 - (8 + bd->count);
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}
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void
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gst_vp8_range_decoder_get_state (GstVp8RangeDecoder * rd,
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GstVp8RangeDecoderState * state)
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{
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BOOL_DECODER *const bd = BOOL_DECODER_CAST (rd);
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if (bd->count < 0)
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vp8dx_bool_decoder_fill (bd);
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state->range = bd->range;
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state->value = (guint8) ((bd->value) >> (VP8_BD_VALUE_SIZE - 8));
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state->count = (8 + bd->count) % 8;
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}
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