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Implement a cruncher for lossless at method 6.

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Go over the whole compression step for each of the
transforms and pick the best one.

Change-Id: I3a1b1458348c468558be0fcf491038a5724c9364
This commit is contained in:
Vincent Rabaud
2017-04-20 16:56:36 +02:00
parent 1b92b237ac
commit adab8ce020
4 changed files with 195 additions and 113 deletions
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14
src/utils/bit_writer_utils.c
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@ -246,6 +246,20 @@ void VP8LBitWriterWipeOut(VP8LBitWriter* const bw) {
}
}
void VP8LBitWriterReset(const VP8LBitWriter* const bw_init,
VP8LBitWriter* const bw) {
bw->bits_ = bw_init->bits_;
bw->used_ = bw_init->used_;
bw->cur_ = bw->buf_ + (bw_init->cur_ - bw_init->buf_);
bw->error_ = bw_init->error_;
}
void VP8LBitWriterSwap(VP8LBitWriter* const src, VP8LBitWriter* const dst) {
const VP8LBitWriter tmp = *src;
*src = *dst;
*dst = tmp;
}
void VP8LPutBitsFlushBits(VP8LBitWriter* const bw) {
// If needed, make some room by flushing some bits out.
if (bw->cur_ + VP8L_WRITER_BYTES > bw->end_) {

5
src/utils/bit_writer_utils.h
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@ -110,6 +110,11 @@ int VP8LBitWriterInit(VP8LBitWriter* const bw, size_t expected_size);
uint8_t* VP8LBitWriterFinish(VP8LBitWriter* const bw);
// Release any pending memory and zeroes the object.
void VP8LBitWriterWipeOut(VP8LBitWriter* const bw);
// Resets the cursor of the BitWriter bw to when it was like in bw_init.
void VP8LBitWriterReset(const VP8LBitWriter* const bw_init,
VP8LBitWriter* const bw);
// Swaps the memory held by two BitWriters.
void VP8LBitWriterSwap(VP8LBitWriter* const src, VP8LBitWriter* const dst);
// Internal function for VP8LPutBits flushing 32 bits from the written state.
void VP8LPutBitsFlushBits(VP8LBitWriter* const bw);