437 lines
14 KiB
C
437 lines
14 KiB
C
// Copyright 2011 Google Inc. All Rights Reserved.
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//
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// This code is licensed under the same terms as WebM:
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// Software License Agreement: http://www.webmproject.org/license/software/
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// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
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// -----------------------------------------------------------------------------
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//
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// Header syntax writing
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#include <assert.h>
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#include "../format_constants.h"
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#include "./vp8enci.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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//------------------------------------------------------------------------------
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// Helper functions
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// TODO(later): Move to webp/format_constants.h?
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static void PutLE24(uint8_t* const data, uint32_t val) {
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data[0] = (val >> 0) & 0xff;
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data[1] = (val >> 8) & 0xff;
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data[2] = (val >> 16) & 0xff;
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}
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static void PutLE32(uint8_t* const data, uint32_t val) {
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PutLE24(data, val);
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data[3] = (val >> 24) & 0xff;
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}
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static int IsVP8XNeeded(const VP8Encoder* const enc) {
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return !!enc->has_alpha_; // Currently the only case when VP8X is needed.
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// This could change in the future.
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}
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static int PutPaddingByte(const WebPPicture* const pic) {
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const uint8_t pad_byte[1] = { 0 };
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return !!pic->writer(pad_byte, 1, pic);
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}
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//------------------------------------------------------------------------------
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// Writers for header's various pieces (in order of appearance)
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static WebPEncodingError PutRIFFHeader(const VP8Encoder* const enc,
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size_t riff_size) {
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const WebPPicture* const pic = enc->pic_;
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uint8_t riff[RIFF_HEADER_SIZE] = {
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'R', 'I', 'F', 'F', 0, 0, 0, 0, 'W', 'E', 'B', 'P'
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};
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assert(riff_size == (uint32_t)riff_size);
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PutLE32(riff + TAG_SIZE, (uint32_t)riff_size);
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if (!pic->writer(riff, sizeof(riff), pic)) {
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return VP8_ENC_ERROR_BAD_WRITE;
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}
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return VP8_ENC_OK;
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}
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static WebPEncodingError PutVP8XHeader(const VP8Encoder* const enc) {
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const WebPPicture* const pic = enc->pic_;
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uint8_t vp8x[CHUNK_HEADER_SIZE + VP8X_CHUNK_SIZE] = {
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'V', 'P', '8', 'X'
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};
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uint32_t flags = 0;
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assert(IsVP8XNeeded(enc));
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assert(pic->width >= 1 && pic->height >= 1);
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assert(pic->width <= MAX_CANVAS_SIZE && pic->height <= MAX_CANVAS_SIZE);
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if (enc->has_alpha_) {
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flags |= ALPHA_FLAG_BIT;
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}
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PutLE32(vp8x + TAG_SIZE, VP8X_CHUNK_SIZE);
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PutLE32(vp8x + CHUNK_HEADER_SIZE, flags);
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PutLE24(vp8x + CHUNK_HEADER_SIZE + 4, pic->width - 1);
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PutLE24(vp8x + CHUNK_HEADER_SIZE + 7, pic->height - 1);
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if(!pic->writer(vp8x, sizeof(vp8x), pic)) {
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return VP8_ENC_ERROR_BAD_WRITE;
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}
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return VP8_ENC_OK;
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}
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static WebPEncodingError PutAlphaChunk(const VP8Encoder* const enc) {
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const WebPPicture* const pic = enc->pic_;
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uint8_t alpha_chunk_hdr[CHUNK_HEADER_SIZE] = {
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'A', 'L', 'P', 'H'
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};
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assert(enc->has_alpha_);
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// Alpha chunk header.
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PutLE32(alpha_chunk_hdr + TAG_SIZE, enc->alpha_data_size_);
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if (!pic->writer(alpha_chunk_hdr, sizeof(alpha_chunk_hdr), pic)) {
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return VP8_ENC_ERROR_BAD_WRITE;
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}
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// Alpha chunk data.
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if (!pic->writer(enc->alpha_data_, enc->alpha_data_size_, pic)) {
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return VP8_ENC_ERROR_BAD_WRITE;
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}
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// Padding.
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if ((enc->alpha_data_size_ & 1) && !PutPaddingByte(pic)) {
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return VP8_ENC_ERROR_BAD_WRITE;
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}
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return VP8_ENC_OK;
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}
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static WebPEncodingError PutVP8Header(const WebPPicture* const pic,
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size_t vp8_size) {
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uint8_t vp8_chunk_hdr[CHUNK_HEADER_SIZE] = {
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'V', 'P', '8', ' '
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};
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assert(vp8_size == (uint32_t)vp8_size);
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PutLE32(vp8_chunk_hdr + TAG_SIZE, (uint32_t)vp8_size);
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if (!pic->writer(vp8_chunk_hdr, sizeof(vp8_chunk_hdr), pic)) {
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return VP8_ENC_ERROR_BAD_WRITE;
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}
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return VP8_ENC_OK;
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}
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static WebPEncodingError PutVP8FrameHeader(const WebPPicture* const pic,
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int profile, size_t size0) {
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uint8_t vp8_frm_hdr[VP8_FRAME_HEADER_SIZE];
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uint32_t bits;
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if (size0 >= VP8_MAX_PARTITION0_SIZE) { // partition #0 is too big to fit
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return VP8_ENC_ERROR_PARTITION0_OVERFLOW;
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}
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// Paragraph 9.1.
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bits = 0 // keyframe (1b)
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| (profile << 1) // profile (3b)
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| (1 << 4) // visible (1b)
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| ((uint32_t)size0 << 5); // partition length (19b)
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vp8_frm_hdr[0] = (bits >> 0) & 0xff;
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vp8_frm_hdr[1] = (bits >> 8) & 0xff;
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vp8_frm_hdr[2] = (bits >> 16) & 0xff;
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// signature
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vp8_frm_hdr[3] = (VP8_SIGNATURE >> 16) & 0xff;
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vp8_frm_hdr[4] = (VP8_SIGNATURE >> 8) & 0xff;
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vp8_frm_hdr[5] = (VP8_SIGNATURE >> 0) & 0xff;
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// dimensions
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vp8_frm_hdr[6] = pic->width & 0xff;
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vp8_frm_hdr[7] = pic->width >> 8;
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vp8_frm_hdr[8] = pic->height & 0xff;
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vp8_frm_hdr[9] = pic->height >> 8;
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if (!pic->writer(vp8_frm_hdr, sizeof(vp8_frm_hdr), pic)) {
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return VP8_ENC_ERROR_BAD_WRITE;
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}
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return VP8_ENC_OK;
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}
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// WebP Headers.
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static int PutWebPHeaders(const VP8Encoder* const enc, size_t size0,
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size_t vp8_size, size_t riff_size) {
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WebPPicture* const pic = enc->pic_;
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WebPEncodingError err = VP8_ENC_OK;
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// RIFF header.
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err = PutRIFFHeader(enc, riff_size);
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if (err != VP8_ENC_OK) goto Error;
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// VP8X.
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if (IsVP8XNeeded(enc)) {
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err = PutVP8XHeader(enc);
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if (err != VP8_ENC_OK) goto Error;
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}
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// Alpha.
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if (enc->has_alpha_) {
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err = PutAlphaChunk(enc);
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if (err != VP8_ENC_OK) goto Error;
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}
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// VP8 header.
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err = PutVP8Header(pic, vp8_size);
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if (err != VP8_ENC_OK) goto Error;
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// VP8 frame header.
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err = PutVP8FrameHeader(pic, enc->profile_, size0);
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if (err != VP8_ENC_OK) goto Error;
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// All OK.
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return 1;
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// Error.
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Error:
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return WebPEncodingSetError(pic, err);
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}
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// Segmentation header
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static void PutSegmentHeader(VP8BitWriter* const bw,
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const VP8Encoder* const enc) {
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const VP8SegmentHeader* const hdr = &enc->segment_hdr_;
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const VP8Proba* const proba = &enc->proba_;
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if (VP8PutBitUniform(bw, (hdr->num_segments_ > 1))) {
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// We always 'update' the quant and filter strength values
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const int update_data = 1;
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int s;
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VP8PutBitUniform(bw, hdr->update_map_);
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if (VP8PutBitUniform(bw, update_data)) {
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// we always use absolute values, not relative ones
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VP8PutBitUniform(bw, 1); // (segment_feature_mode = 1. Paragraph 9.3.)
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for (s = 0; s < NUM_MB_SEGMENTS; ++s) {
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VP8PutSignedValue(bw, enc->dqm_[s].quant_, 7);
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}
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for (s = 0; s < NUM_MB_SEGMENTS; ++s) {
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VP8PutSignedValue(bw, enc->dqm_[s].fstrength_, 6);
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}
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}
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if (hdr->update_map_) {
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for (s = 0; s < 3; ++s) {
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if (VP8PutBitUniform(bw, (proba->segments_[s] != 255u))) {
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VP8PutValue(bw, proba->segments_[s], 8);
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}
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}
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}
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}
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}
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// Filtering parameters header
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static void PutFilterHeader(VP8BitWriter* const bw,
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const VP8FilterHeader* const hdr) {
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const int use_lf_delta = (hdr->i4x4_lf_delta_ != 0);
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VP8PutBitUniform(bw, hdr->simple_);
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VP8PutValue(bw, hdr->level_, 6);
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VP8PutValue(bw, hdr->sharpness_, 3);
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if (VP8PutBitUniform(bw, use_lf_delta)) {
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// '0' is the default value for i4x4_lf_delta_ at frame #0.
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const int need_update = (hdr->i4x4_lf_delta_ != 0);
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if (VP8PutBitUniform(bw, need_update)) {
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// we don't use ref_lf_delta => emit four 0 bits
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VP8PutValue(bw, 0, 4);
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// we use mode_lf_delta for i4x4
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VP8PutSignedValue(bw, hdr->i4x4_lf_delta_, 6);
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VP8PutValue(bw, 0, 3); // all others unused
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}
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}
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}
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// Nominal quantization parameters
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static void PutQuant(VP8BitWriter* const bw,
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const VP8Encoder* const enc) {
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VP8PutValue(bw, enc->base_quant_, 7);
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VP8PutSignedValue(bw, enc->dq_y1_dc_, 4);
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VP8PutSignedValue(bw, enc->dq_y2_dc_, 4);
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VP8PutSignedValue(bw, enc->dq_y2_ac_, 4);
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VP8PutSignedValue(bw, enc->dq_uv_dc_, 4);
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VP8PutSignedValue(bw, enc->dq_uv_ac_, 4);
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}
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// Partition sizes
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static int EmitPartitionsSize(const VP8Encoder* const enc,
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WebPPicture* const pic) {
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uint8_t buf[3 * (MAX_NUM_PARTITIONS - 1)];
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int p;
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for (p = 0; p < enc->num_parts_ - 1; ++p) {
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const size_t part_size = VP8BitWriterSize(enc->parts_ + p);
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if (part_size >= VP8_MAX_PARTITION_SIZE) {
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return WebPEncodingSetError(pic, VP8_ENC_ERROR_PARTITION_OVERFLOW);
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}
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buf[3 * p + 0] = (part_size >> 0) & 0xff;
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buf[3 * p + 1] = (part_size >> 8) & 0xff;
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buf[3 * p + 2] = (part_size >> 16) & 0xff;
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}
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return p ? pic->writer(buf, 3 * p, pic) : 1;
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}
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//------------------------------------------------------------------------------
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#ifdef WEBP_EXPERIMENTAL_FEATURES
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#define KTRAILER_SIZE 8
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static int WriteExtensions(VP8Encoder* const enc) {
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uint8_t buffer[KTRAILER_SIZE];
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VP8BitWriter* const bw = &enc->bw_;
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WebPPicture* const pic = enc->pic_;
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// Layer (bytes 0..3)
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PutLE24(buffer + 0, enc->layer_data_size_);
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buffer[3] = enc->pic_->colorspace & WEBP_CSP_UV_MASK;
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if (enc->layer_data_size_ > 0) {
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assert(enc->use_layer_);
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// append layer data to last partition
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if (!VP8BitWriterAppend(&enc->parts_[enc->num_parts_ - 1],
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enc->layer_data_, enc->layer_data_size_)) {
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return WebPEncodingSetError(pic, VP8_ENC_ERROR_BITSTREAM_OUT_OF_MEMORY);
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}
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}
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buffer[KTRAILER_SIZE - 1] = 0x01; // marker
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if (!VP8BitWriterAppend(bw, buffer, KTRAILER_SIZE)) {
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return WebPEncodingSetError(pic, VP8_ENC_ERROR_BITSTREAM_OUT_OF_MEMORY);
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}
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return 1;
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}
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#endif /* WEBP_EXPERIMENTAL_FEATURES */
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//------------------------------------------------------------------------------
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static size_t GeneratePartition0(VP8Encoder* const enc) {
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VP8BitWriter* const bw = &enc->bw_;
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const int mb_size = enc->mb_w_ * enc->mb_h_;
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uint64_t pos1, pos2, pos3;
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#ifdef WEBP_EXPERIMENTAL_FEATURES
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const int need_extensions = enc->use_layer_;
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#endif
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pos1 = VP8BitWriterPos(bw);
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VP8BitWriterInit(bw, mb_size * 7 / 8); // ~7 bits per macroblock
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#ifdef WEBP_EXPERIMENTAL_FEATURES
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VP8PutBitUniform(bw, need_extensions); // extensions
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#else
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VP8PutBitUniform(bw, 0); // colorspace
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#endif
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VP8PutBitUniform(bw, 0); // clamp type
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PutSegmentHeader(bw, enc);
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PutFilterHeader(bw, &enc->filter_hdr_);
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VP8PutValue(bw, enc->config_->partitions, 2);
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PutQuant(bw, enc);
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VP8PutBitUniform(bw, 0); // no proba update
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VP8WriteProbas(bw, &enc->proba_);
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pos2 = VP8BitWriterPos(bw);
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VP8CodeIntraModes(enc);
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VP8BitWriterFinish(bw);
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#ifdef WEBP_EXPERIMENTAL_FEATURES
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if (need_extensions && !WriteExtensions(enc)) {
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return 0;
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}
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#endif
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pos3 = VP8BitWriterPos(bw);
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if (enc->pic_->stats) {
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enc->pic_->stats->header_bytes[0] = (int)((pos2 - pos1 + 7) >> 3);
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enc->pic_->stats->header_bytes[1] = (int)((pos3 - pos2 + 7) >> 3);
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enc->pic_->stats->alpha_data_size = (int)enc->alpha_data_size_;
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enc->pic_->stats->layer_data_size = (int)enc->layer_data_size_;
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}
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return !bw->error_;
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}
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void VP8EncFreeBitWriters(VP8Encoder* const enc) {
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int p;
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VP8BitWriterWipeOut(&enc->bw_);
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for (p = 0; p < enc->num_parts_; ++p) {
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VP8BitWriterWipeOut(enc->parts_ + p);
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}
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}
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int VP8EncWrite(VP8Encoder* const enc) {
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WebPPicture* const pic = enc->pic_;
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VP8BitWriter* const bw = &enc->bw_;
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const int task_percent = 19;
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const int percent_per_part = task_percent / enc->num_parts_;
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const int final_percent = enc->percent_ + task_percent;
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int ok = 0;
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size_t vp8_size, pad, riff_size;
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int p;
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// Partition #0 with header and partition sizes
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ok = !!GeneratePartition0(enc);
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// Compute VP8 size
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vp8_size = VP8_FRAME_HEADER_SIZE +
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VP8BitWriterSize(bw) +
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3 * (enc->num_parts_ - 1);
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for (p = 0; p < enc->num_parts_; ++p) {
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vp8_size += VP8BitWriterSize(enc->parts_ + p);
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}
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pad = vp8_size & 1;
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vp8_size += pad;
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// Compute RIFF size
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// At the minimum it is: "WEBPVP8 nnnn" + VP8 data size.
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riff_size = TAG_SIZE + CHUNK_HEADER_SIZE + vp8_size;
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if (IsVP8XNeeded(enc)) { // Add size for: VP8X header + data.
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riff_size += CHUNK_HEADER_SIZE + VP8X_CHUNK_SIZE;
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}
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if (enc->has_alpha_) { // Add size for: ALPH header + data.
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const uint32_t padded_alpha_size = enc->alpha_data_size_ +
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(enc->alpha_data_size_ & 1);
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riff_size += CHUNK_HEADER_SIZE + padded_alpha_size;
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}
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// Sanity check.
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if (riff_size > 0xfffffffeU) {
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return WebPEncodingSetError(pic, VP8_ENC_ERROR_FILE_TOO_BIG);
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}
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// Emit headers and partition #0
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{
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const uint8_t* const part0 = VP8BitWriterBuf(bw);
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const size_t size0 = VP8BitWriterSize(bw);
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ok = ok && PutWebPHeaders(enc, size0, vp8_size, riff_size)
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&& pic->writer(part0, size0, pic)
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&& EmitPartitionsSize(enc, pic);
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VP8BitWriterWipeOut(bw); // will free the internal buffer.
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}
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// Token partitions
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for (p = 0; p < enc->num_parts_; ++p) {
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const uint8_t* const buf = VP8BitWriterBuf(enc->parts_ + p);
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const size_t size = VP8BitWriterSize(enc->parts_ + p);
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if (size)
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ok = ok && pic->writer(buf, size, pic);
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VP8BitWriterWipeOut(enc->parts_ + p); // will free the internal buffer.
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ok = ok && WebPReportProgress(pic, enc->percent_ + percent_per_part,
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&enc->percent_);
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}
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// Padding byte
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if (ok && pad) {
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ok = PutPaddingByte(pic);
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}
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enc->coded_size_ = (int)(CHUNK_HEADER_SIZE + riff_size);
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ok = ok && WebPReportProgress(pic, final_percent, &enc->percent_);
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return ok;
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}
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//------------------------------------------------------------------------------
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#if defined(__cplusplus) || defined(c_plusplus)
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} // extern "C"
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#endif
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