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-rw-r--r--kopete/protocols/msn/webcam/libmimic/encode.c419
1 files changed, 0 insertions, 419 deletions
diff --git a/kopete/protocols/msn/webcam/libmimic/encode.c b/kopete/protocols/msn/webcam/libmimic/encode.c
deleted file mode 100644
index 6c8a9de8..00000000
--- a/kopete/protocols/msn/webcam/libmimic/encode.c
+++ /dev/null
@@ -1,419 +0,0 @@
-/* Copyright (C) 2005 Ole André Vadla Ravnås <[email protected]>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-#include "mimic-private.h"
-
-#define LUMINANCE_THRESHOLD 32.0f
-#define CHROMINANCE_THRESHOLD 36.0f
-
-static void encode_main(MimCtx *ctx, guchar *out_buf, gboolean is_pframe);
-
-/**
- * Encode a MIMIC-encoded frame from RGB data.
- *
- * @param ctx the mimic context
- * @param input_buffer buffer containing pixeldata in RGB 24-bpp packed pixel top-down format
- * @param output_buffer buffer that will receive the MIMIC-encoded frame
- * (use #mimic_get_property to determine the required buffer size)
- * @param output_length pointer to an integer that receives the length of the encoded data
- * written to output_buffer
- * @param make_keyframe whether the encoder should make this frame a keyframe
- * @returns #TRUE on success
- */
-gboolean mimic_encode_frame(MimCtx *ctx,
- const guchar *input_buffer,
- guchar *output_buffer,
- gint *output_length,
- gboolean make_keyframe)
-{
- guchar *output_y, *output_cb, *output_cr;
-
- /*
- * Some sanity checks.
- */
- if (ctx == NULL || input_buffer == NULL ||
- output_buffer == NULL || output_length == NULL)
- {
- return FALSE;
- }
-
- if (!ctx->encoder_initialized)
- return FALSE;
-
- /*
- * Initialize state.
- */
- ctx->chunk_ptr = (guint32 *) (output_buffer + 20);
- ctx->cur_chunk = 0;
- ctx->cur_chunk_len = 0;
-
- if (ctx->frame_num == 0)
- make_keyframe = TRUE;
-
- /*
- * Write header.
- */
- memset(output_buffer, 0, 20);
- *((guint16 *) (output_buffer + 0)) = GUINT16_TO_LE(256);
- *((guint16 *) (output_buffer + 2)) = GUINT16_TO_LE(ctx->quality);
- *((guint16 *) (output_buffer + 4)) = GUINT16_TO_LE(ctx->frame_width);
- *((guint16 *) (output_buffer + 6)) = GUINT16_TO_LE(ctx->frame_height);
- *((guint32 *) (output_buffer + 12)) = GUINT32_TO_LE((make_keyframe == 0));
- *(output_buffer + 16) = ctx->num_coeffs;
- *(output_buffer + 17) = 0;
-
- /*
- * Perform RGB to YUV 420 conversion.
- */
- output_y = ctx->cur_frame_buf;
- output_cr = ctx->cur_frame_buf + ctx->y_size;
- output_cb = ctx->cur_frame_buf + ctx->y_size + ctx->crcb_size;
-
- _rgb_to_yuv(input_buffer,
- output_y,
- output_cb,
- output_cr,
- ctx->frame_width,
- ctx->frame_height);
-
- /*
- * Encode frame.
- */
- encode_main(ctx, output_buffer, (make_keyframe == FALSE));
-
- /*
- * Write out any pending bits to stream by zero-padding with 32 bits.
- */
- _write_bits(ctx, 0, 32);
-
- /*
- * Calculate bytes written.
- */
- *output_length = (guchar *) ctx->chunk_ptr - output_buffer;
-
- /*
- * Increment frame counter.
- */
- ctx->frame_num++;
-
- return TRUE;
-}
-
-static gdouble compare_blocks(const guchar *p1,
- const guchar *p2,
- gint stride,
- gint row_count,
- gboolean is_chrom);
-
-/*
- * encode_main
- *
- * Main encoding loop.
- */
-static void encode_main(MimCtx *ctx, guchar *out_buf, gboolean is_pframe)
-{
- gint x, y, i, offset, chrom_ch;
- gint dct_block[64];
- guchar *src, *dst, *p1, *p2;
- gdouble match;
- gboolean encoded;
-
- /*
- * Round down small differences in luminance channel.
- */
- if (is_pframe) {
-
- p1 = ctx->cur_frame_buf;
- p2 = ctx->prev_frame_buf;
-
- for (i = 0; i < ctx->y_size; i++) {
-
- if (abs(p2[0] - p1[0]) < 7)
- p1[0] = p2[0];
-
- p1++;
- p2++;
- }
- }
-
- /*
- * Encode Y plane.
- */
- for (y = 0; y < ctx->num_vblocks_y; y++) {
-
- for (x = 0; x < ctx->num_hblocks_y; x++) {
-
- /* Calculate final offset into buffer. */
- offset = (ctx->y_stride * 8 * y) + (x * 8);
-
- src = NULL;
- encoded = FALSE;
-
- if (is_pframe) {
-
- /* Is the current block similar enough to what it was in the previous frame? */
-
- match = compare_blocks(ctx->cur_frame_buf + offset,
- ctx->prev_frame_buf + offset,
- ctx->y_stride, 8,
- FALSE);
-
- if (match > LUMINANCE_THRESHOLD) {
-
- /* Yes: write out '1' to indicate a no-change condition. */
-
- _write_bits(ctx, 1, 1);
-
- src = ctx->prev_frame_buf + offset;
- encoded = TRUE;
-
- } else {
-
- /* No: Is the current block similar enough to what it was in one
- * of the (up to) 15 last frames preceding the previous? */
-
- gint best_index = 0;
- gdouble best_match = 0.0;
-
- gint num_backrefs = ctx->frame_num - 1;
- if (num_backrefs > 15)
- num_backrefs = 15;
-
- for (i = 1; i <= num_backrefs; i++) {
-
- match = compare_blocks(ctx->buf_ptrs[(ctx->ptr_index + i) % 16] + offset,
- ctx->cur_frame_buf + offset,
- ctx->y_stride, 8,
- FALSE);
-
- if (match > LUMINANCE_THRESHOLD && match > best_match) {
- best_index = i;
- best_match = match;
- }
-
- }
-
- if (best_index != 0) {
-
- /* Yes: write out '01' to indicate a "change but like previous"-condition,
- * followed by 4 bits containing the back-reference. */
- _write_bits(ctx, 0, 1);
- _write_bits(ctx, 1, 1);
- _write_bits(ctx, best_index, 4);
-
- src = ctx->buf_ptrs[(ctx->ptr_index + best_index) % 16] + offset;
- encoded = TRUE;
-
- }
- }
- }
-
- if (!encoded) {
-
- /* Keyframe or in any case no? ;-) Well, encode it then. */
-
- if (is_pframe) {
- _write_bits(ctx, 0, 1);
- _write_bits(ctx, 0, 1);
- }
-
- _fdct_quant_block(ctx,
- dct_block,
- ctx->cur_frame_buf + offset,
- ctx->y_stride,
- FALSE,
- ctx->num_coeffs);
-
- _vlc_encode_block(ctx,
- dct_block,
- ctx->num_coeffs);
-
- }
-
- /* And if there was some kind of no-change condition,
- * we want to copy the previous block. */
- if (src != NULL) {
-
- dst = ctx->cur_frame_buf + offset;
- for (i = 0; i < 8; i++) {
-
- memcpy(dst, src, 8);
-
- src += ctx->y_stride;
- dst += ctx->y_stride;
- }
-
- }
-
- }
-
- }
-
- /*
- * Encode Cr and Cb planes.
- */
- for (chrom_ch = 0; chrom_ch < 2; chrom_ch++) {
-
- /* Calculate base offset into buffer. */
- gint base_offset = ctx->y_size + (ctx->crcb_size * chrom_ch);
-
- for (y = 0; y < ctx->num_vblocks_cbcr; y++) {
- guchar tmp_block[64];
- guint num_rows = 8;
-
- /* The last row of blocks in chrominance for 160x120 resolution
- * is half the normal height and must be accounted for. */
- if (y + 1 == ctx->num_vblocks_cbcr && ctx->frame_height % 16 != 0)
- num_rows = 4;
-
- for (x = 0; x < ctx->num_hblocks_cbcr; x++) {
-
- /* Calculate final offset into buffer. */
- offset = base_offset + (ctx->crcb_stride * 8 * y) + (x * 8);
-
- src = NULL;
- encoded = FALSE;
-
- if (is_pframe) {
-
- /* Is the current block similar enough to what it was in the previous frame? */
-
- match = compare_blocks(ctx->prev_frame_buf + offset,
- ctx->cur_frame_buf + offset,
- ctx->crcb_stride, num_rows,
- TRUE);
-
- if (match > CHROMINANCE_THRESHOLD) {
-
- /* Yes: write out '0' to indicate a no-change condition. */
-
- _write_bits(ctx, 0, 1);
-
- encoded = TRUE;
-
- src = ctx->prev_frame_buf + offset;
- dst = ctx->cur_frame_buf + offset;
- for (i = 0; i < num_rows; i++) {
-
- memcpy(dst, src, 8);
-
- src += ctx->crcb_stride;
- dst += ctx->crcb_stride;
- }
- }
-
- }
-
- if (!encoded) {
-
- /* Keyframe or just not similar enough? ;-) Well, encode it then. */
-
- if (is_pframe)
- _write_bits(ctx, 1, 1);
-
- /* Use a temporary array to handle cases where the
- * current block is not of normal height (see above). */
- src = ctx->cur_frame_buf + offset;
- dst = tmp_block;
- for (i = 0; i < 8; i++) {
-
- memcpy(dst, src, 8);
-
- if (i < (num_rows - 1))
- src += ctx->crcb_stride;
- dst += 8;
- }
-
- _fdct_quant_block(ctx,
- dct_block,
- tmp_block,
- 8,
- TRUE,
- ctx->num_coeffs);
-
- _vlc_encode_block(ctx,
- dct_block,
- ctx->num_coeffs);
-
- }
-
- }
-
- }
-
- }
-
- /*
- * Make a copy of the current frame and store in
- * the circular pointer list of 16 entries.
- */
- ctx->prev_frame_buf = ctx->buf_ptrs[ctx->ptr_index];
- memcpy(ctx->prev_frame_buf, ctx->cur_frame_buf,
- ctx->y_size + (ctx->crcb_size * 2));
-
- if (--ctx->ptr_index < 0)
- ctx->ptr_index = 15;
-}
-
-/*
- * compare_blocks
- *
- * Helper-function used to compare two blocks and
- * determine how similar they are.
- */
-static gdouble compare_blocks(const guchar *p1,
- const guchar *p2,
- gint stride,
- gint row_count,
- gboolean is_chrom)
-{
- gint i, j, sum;
- gdouble d;
-
- sum = 0;
-
- for (i = 0; i < row_count; i++) {
-
- for (j = 0; j < 8; j++) {
-
- gint d = p2[j] - p1[j];
-
- sum += d * d;
- }
-
- p1 += stride;
- p2 += stride;
- }
-
- if (is_chrom) {
- if (row_count == 8)
- d = sum * 0.015625;
- else
- d = sum * 0.03125;
- } else {
- d = sum / 64;
- }
-
- if (d == 0.0f)
- return 100.0f;
- else
- return (10.0f * log(65025.0f / d)) / G_LN10;
-}
-
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