615 lines
20 KiB
C
615 lines
20 KiB
C
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/*
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* lossless JPEG shared bits
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* Copyright (c) 2000, 2001 Fabrice Bellard
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* Copyright (c) 2003 Alex Beregszaszi
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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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 <stdint.h>
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#include <string.h>
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#include "libavutil/common.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/pixfmt.h"
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#include "avcodec.h"
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#include "idctdsp.h"
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#include "jpegtables.h"
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#include "put_bits.h"
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#include "mjpegenc.h"
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#include "mjpegenc_common.h"
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#include "mjpegenc_huffman.h"
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#include "mjpeg.h"
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av_cold void ff_init_uni_ac_vlc(const uint8_t huff_size_ac[256], uint8_t *uni_ac_vlc_len)
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{
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int i;
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for (i = 0; i < 128; i++) {
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int level = i - 64;
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int run;
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if (!level)
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continue;
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for (run = 0; run < 64; run++) {
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int len, code, nbits;
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int alevel = FFABS(level);
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len = (run >> 4) * huff_size_ac[0xf0];
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nbits= av_log2_16bit(alevel) + 1;
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code = ((15&run) << 4) | nbits;
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len += huff_size_ac[code] + nbits;
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uni_ac_vlc_len[UNI_AC_ENC_INDEX(run, i)] = len;
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// We ignore EOB as its just a constant which does not change generally
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}
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}
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}
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/* table_class: 0 = DC coef, 1 = AC coefs */
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static int put_huffman_table(PutBitContext *p, int table_class, int table_id,
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const uint8_t *bits_table, const uint8_t *value_table)
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{
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int n, i;
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put_bits(p, 4, table_class);
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put_bits(p, 4, table_id);
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n = 0;
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for(i=1;i<=16;i++) {
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n += bits_table[i];
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put_bits(p, 8, bits_table[i]);
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}
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for(i=0;i<n;i++)
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put_bits(p, 8, value_table[i]);
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return n + 17;
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}
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static void jpeg_table_header(AVCodecContext *avctx, PutBitContext *p,
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ScanTable *intra_scantable,
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uint16_t luma_intra_matrix[64],
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uint16_t chroma_intra_matrix[64],
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int hsample[3])
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{
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int i, j, size;
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uint8_t *ptr;
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MpegEncContext *s = NULL;
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/* Since avctx->priv_data will point to LJpegEncContext in this case */
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if (avctx->codec_id != AV_CODEC_ID_LJPEG)
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s = avctx->priv_data;
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if (avctx->codec_id != AV_CODEC_ID_LJPEG) {
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int matrix_count = 1 + !!memcmp(luma_intra_matrix,
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chroma_intra_matrix,
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sizeof(luma_intra_matrix[0]) * 64);
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if (s && s->force_duplicated_matrix)
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matrix_count = 2;
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/* quant matrixes */
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put_marker(p, DQT);
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put_bits(p, 16, 2 + matrix_count * (1 + 64));
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put_bits(p, 4, 0); /* 8 bit precision */
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put_bits(p, 4, 0); /* table 0 */
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for(i=0;i<64;i++) {
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j = intra_scantable->permutated[i];
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put_bits(p, 8, luma_intra_matrix[j]);
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}
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if (matrix_count > 1) {
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put_bits(p, 4, 0); /* 8 bit precision */
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put_bits(p, 4, 1); /* table 1 */
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for(i=0;i<64;i++) {
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j = intra_scantable->permutated[i];
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put_bits(p, 8, chroma_intra_matrix[j]);
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}
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}
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}
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if(avctx->active_thread_type & FF_THREAD_SLICE){
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put_marker(p, DRI);
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put_bits(p, 16, 4);
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put_bits(p, 16, (avctx->width-1)/(8*hsample[0]) + 1);
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}
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/* huffman table */
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put_marker(p, DHT);
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flush_put_bits(p);
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ptr = put_bits_ptr(p);
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put_bits(p, 16, 0); /* patched later */
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size = 2;
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// Only MJPEG can have a variable Huffman variable. All other
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// formats use the default Huffman table.
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if (s && s->huffman == HUFFMAN_TABLE_OPTIMAL) {
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size += put_huffman_table(p, 0, 0, s->mjpeg_ctx->bits_dc_luminance,
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s->mjpeg_ctx->val_dc_luminance);
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size += put_huffman_table(p, 0, 1, s->mjpeg_ctx->bits_dc_chrominance,
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s->mjpeg_ctx->val_dc_chrominance);
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size += put_huffman_table(p, 1, 0, s->mjpeg_ctx->bits_ac_luminance,
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s->mjpeg_ctx->val_ac_luminance);
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size += put_huffman_table(p, 1, 1, s->mjpeg_ctx->bits_ac_chrominance,
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s->mjpeg_ctx->val_ac_chrominance);
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} else {
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size += put_huffman_table(p, 0, 0, avpriv_mjpeg_bits_dc_luminance,
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avpriv_mjpeg_val_dc);
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size += put_huffman_table(p, 0, 1, avpriv_mjpeg_bits_dc_chrominance,
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avpriv_mjpeg_val_dc);
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size += put_huffman_table(p, 1, 0, avpriv_mjpeg_bits_ac_luminance,
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avpriv_mjpeg_val_ac_luminance);
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size += put_huffman_table(p, 1, 1, avpriv_mjpeg_bits_ac_chrominance,
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avpriv_mjpeg_val_ac_chrominance);
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}
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AV_WB16(ptr, size);
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}
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static void jpeg_put_comments(AVCodecContext *avctx, PutBitContext *p)
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{
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int size;
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uint8_t *ptr;
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if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0) {
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AVRational sar = avctx->sample_aspect_ratio;
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if (sar.num > 65535 || sar.den > 65535) {
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if (!av_reduce(&sar.num, &sar.den, avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den, 65535))
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av_log(avctx, AV_LOG_WARNING,
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"Cannot store exact aspect ratio %d:%d\n",
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avctx->sample_aspect_ratio.num,
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avctx->sample_aspect_ratio.den);
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}
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/* JFIF header */
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put_marker(p, APP0);
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put_bits(p, 16, 16);
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avpriv_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */
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/* The most significant byte is used for major revisions, the least
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* significant byte for minor revisions. Version 1.02 is the current
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* released revision. */
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put_bits(p, 16, 0x0102);
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put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
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put_bits(p, 16, sar.num);
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put_bits(p, 16, sar.den);
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put_bits(p, 8, 0); /* thumbnail width */
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put_bits(p, 8, 0); /* thumbnail height */
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}
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/* comment */
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if (!(avctx->flags & AV_CODEC_FLAG_BITEXACT)) {
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put_marker(p, COM);
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flush_put_bits(p);
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ptr = put_bits_ptr(p);
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put_bits(p, 16, 0); /* patched later */
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avpriv_put_string(p, LIBAVCODEC_IDENT, 1);
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size = strlen(LIBAVCODEC_IDENT)+3;
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AV_WB16(ptr, size);
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}
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if (((avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
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avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
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avctx->pix_fmt == AV_PIX_FMT_YUV444P) && avctx->color_range != AVCOL_RANGE_JPEG)
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|| avctx->color_range == AVCOL_RANGE_MPEG) {
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put_marker(p, COM);
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flush_put_bits(p);
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ptr = put_bits_ptr(p);
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put_bits(p, 16, 0); /* patched later */
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avpriv_put_string(p, "CS=ITU601", 1);
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size = strlen("CS=ITU601")+3;
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AV_WB16(ptr, size);
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}
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}
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void ff_mjpeg_init_hvsample(AVCodecContext *avctx, int hsample[4], int vsample[4])
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{
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int chroma_h_shift, chroma_v_shift;
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av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift,
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&chroma_v_shift);
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if (avctx->codec->id == AV_CODEC_ID_LJPEG &&
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( avctx->pix_fmt == AV_PIX_FMT_BGR0
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|| avctx->pix_fmt == AV_PIX_FMT_BGRA
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|| avctx->pix_fmt == AV_PIX_FMT_BGR24)) {
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vsample[0] = hsample[0] =
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vsample[1] = hsample[1] =
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vsample[2] = hsample[2] =
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vsample[3] = hsample[3] = 1;
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} else if (avctx->pix_fmt == AV_PIX_FMT_YUV444P || avctx->pix_fmt == AV_PIX_FMT_YUVJ444P) {
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vsample[0] = vsample[1] = vsample[2] = 2;
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hsample[0] = hsample[1] = hsample[2] = 1;
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} else {
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vsample[0] = 2;
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vsample[1] = 2 >> chroma_v_shift;
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vsample[2] = 2 >> chroma_v_shift;
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hsample[0] = 2;
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hsample[1] = 2 >> chroma_h_shift;
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hsample[2] = 2 >> chroma_h_shift;
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}
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}
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void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
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ScanTable *intra_scantable, int pred,
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uint16_t luma_intra_matrix[64],
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uint16_t chroma_intra_matrix[64])
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{
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const int lossless = avctx->codec_id != AV_CODEC_ID_MJPEG && avctx->codec_id != AV_CODEC_ID_AMV;
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int hsample[4], vsample[4];
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int i;
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int components = 3 + (avctx->pix_fmt == AV_PIX_FMT_BGRA);
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int chroma_matrix = !!memcmp(luma_intra_matrix,
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chroma_intra_matrix,
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sizeof(luma_intra_matrix[0])*64);
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ff_mjpeg_init_hvsample(avctx, hsample, vsample);
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put_marker(pb, SOI);
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// hack for AMV mjpeg format
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if(avctx->codec_id == AV_CODEC_ID_AMV) goto end;
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jpeg_put_comments(avctx, pb);
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jpeg_table_header(avctx, pb, intra_scantable, luma_intra_matrix, chroma_intra_matrix, hsample);
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switch (avctx->codec_id) {
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case AV_CODEC_ID_MJPEG: put_marker(pb, SOF0 ); break;
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case AV_CODEC_ID_LJPEG: put_marker(pb, SOF3 ); break;
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default: av_assert0(0);
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}
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put_bits(pb, 16, 17);
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if (lossless && ( avctx->pix_fmt == AV_PIX_FMT_BGR0
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|| avctx->pix_fmt == AV_PIX_FMT_BGRA
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|| avctx->pix_fmt == AV_PIX_FMT_BGR24))
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put_bits(pb, 8, 9); /* 9 bits/component RCT */
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else
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put_bits(pb, 8, 8); /* 8 bits/component */
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put_bits(pb, 16, avctx->height);
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put_bits(pb, 16, avctx->width);
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put_bits(pb, 8, components); /* 3 or 4 components */
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/* Y component */
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put_bits(pb, 8, 1); /* component number */
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put_bits(pb, 4, hsample[0]); /* H factor */
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put_bits(pb, 4, vsample[0]); /* V factor */
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put_bits(pb, 8, 0); /* select matrix */
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/* Cb component */
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put_bits(pb, 8, 2); /* component number */
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put_bits(pb, 4, hsample[1]); /* H factor */
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put_bits(pb, 4, vsample[1]); /* V factor */
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put_bits(pb, 8, lossless ? 0 : chroma_matrix); /* select matrix */
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/* Cr component */
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put_bits(pb, 8, 3); /* component number */
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put_bits(pb, 4, hsample[2]); /* H factor */
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put_bits(pb, 4, vsample[2]); /* V factor */
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put_bits(pb, 8, lossless ? 0 : chroma_matrix); /* select matrix */
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if (components == 4) {
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put_bits(pb, 8, 4); /* component number */
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put_bits(pb, 4, hsample[3]); /* H factor */
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put_bits(pb, 4, vsample[3]); /* V factor */
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put_bits(pb, 8, 0); /* select matrix */
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}
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/* scan header */
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put_marker(pb, SOS);
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put_bits(pb, 16, 6 + 2*components); /* length */
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put_bits(pb, 8, components); /* 3 components */
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/* Y component */
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put_bits(pb, 8, 1); /* index */
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put_bits(pb, 4, 0); /* DC huffman table index */
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put_bits(pb, 4, 0); /* AC huffman table index */
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/* Cb component */
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put_bits(pb, 8, 2); /* index */
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put_bits(pb, 4, 1); /* DC huffman table index */
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put_bits(pb, 4, lossless ? 0 : 1); /* AC huffman table index */
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/* Cr component */
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|
put_bits(pb, 8, 3); /* index */
|
||
|
|
put_bits(pb, 4, 1); /* DC huffman table index */
|
||
|
|
put_bits(pb, 4, lossless ? 0 : 1); /* AC huffman table index */
|
||
|
|
|
||
|
|
if (components == 4) {
|
||
|
|
/* Alpha component */
|
||
|
|
put_bits(pb, 8, 4); /* index */
|
||
|
|
put_bits(pb, 4, 0); /* DC huffman table index */
|
||
|
|
put_bits(pb, 4, 0); /* AC huffman table index */
|
||
|
|
}
|
||
|
|
|
||
|
|
put_bits(pb, 8, lossless ? pred : 0); /* Ss (not used) */
|
||
|
|
|
||
|
|
switch (avctx->codec_id) {
|
||
|
|
case AV_CODEC_ID_MJPEG: put_bits(pb, 8, 63); break; /* Se (not used) */
|
||
|
|
case AV_CODEC_ID_LJPEG: put_bits(pb, 8, 0); break; /* not used */
|
||
|
|
default: av_assert0(0);
|
||
|
|
}
|
||
|
|
|
||
|
|
put_bits(pb, 8, 0); /* Ah/Al (not used) */
|
||
|
|
|
||
|
|
end:
|
||
|
|
if (!lossless) {
|
||
|
|
MpegEncContext *s = avctx->priv_data;
|
||
|
|
av_assert0(avctx->codec->priv_data_size == sizeof(MpegEncContext));
|
||
|
|
|
||
|
|
s->esc_pos = put_bits_count(pb) >> 3;
|
||
|
|
for(i=1; i<s->slice_context_count; i++)
|
||
|
|
s->thread_context[i]->esc_pos = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Encodes and outputs the entire frame in the JPEG format.
|
||
|
|
*
|
||
|
|
* @param s The MpegEncContext.
|
||
|
|
*/
|
||
|
|
void ff_mjpeg_encode_picture_frame(MpegEncContext *s)
|
||
|
|
{
|
||
|
|
int i, nbits, code, table_id;
|
||
|
|
MJpegContext *m = s->mjpeg_ctx;
|
||
|
|
uint8_t *huff_size[4] = {m->huff_size_dc_luminance,
|
||
|
|
m->huff_size_dc_chrominance,
|
||
|
|
m->huff_size_ac_luminance,
|
||
|
|
m->huff_size_ac_chrominance};
|
||
|
|
uint16_t *huff_code[4] = {m->huff_code_dc_luminance,
|
||
|
|
m->huff_code_dc_chrominance,
|
||
|
|
m->huff_code_ac_luminance,
|
||
|
|
m->huff_code_ac_chrominance};
|
||
|
|
size_t total_bits = 0;
|
||
|
|
size_t bytes_needed;
|
||
|
|
|
||
|
|
s->header_bits = get_bits_diff(s);
|
||
|
|
// Estimate the total size first
|
||
|
|
for (i = 0; i < m->huff_ncode; i++) {
|
||
|
|
table_id = m->huff_buffer[i].table_id;
|
||
|
|
code = m->huff_buffer[i].code;
|
||
|
|
nbits = code & 0xf;
|
||
|
|
|
||
|
|
total_bits += huff_size[table_id][code] + nbits;
|
||
|
|
}
|
||
|
|
|
||
|
|
bytes_needed = (total_bits + 7) / 8;
|
||
|
|
ff_mpv_reallocate_putbitbuffer(s, bytes_needed, bytes_needed);
|
||
|
|
|
||
|
|
for (i = 0; i < m->huff_ncode; i++) {
|
||
|
|
table_id = m->huff_buffer[i].table_id;
|
||
|
|
code = m->huff_buffer[i].code;
|
||
|
|
nbits = code & 0xf;
|
||
|
|
|
||
|
|
put_bits(&s->pb, huff_size[table_id][code], huff_code[table_id][code]);
|
||
|
|
if (nbits != 0) {
|
||
|
|
put_sbits(&s->pb, nbits, m->huff_buffer[i].mant);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
m->huff_ncode = 0;
|
||
|
|
s->i_tex_bits = get_bits_diff(s);
|
||
|
|
}
|
||
|
|
|
||
|
|
void ff_mjpeg_escape_FF(PutBitContext *pb, int start)
|
||
|
|
{
|
||
|
|
int size;
|
||
|
|
int i, ff_count;
|
||
|
|
uint8_t *buf = pb->buf + start;
|
||
|
|
int align= (-(size_t)(buf))&3;
|
||
|
|
int pad = (-put_bits_count(pb))&7;
|
||
|
|
|
||
|
|
if (pad)
|
||
|
|
put_bits(pb, pad, (1<<pad)-1);
|
||
|
|
|
||
|
|
flush_put_bits(pb);
|
||
|
|
size = put_bits_count(pb) - start * 8;
|
||
|
|
|
||
|
|
av_assert1((size&7) == 0);
|
||
|
|
size >>= 3;
|
||
|
|
|
||
|
|
ff_count=0;
|
||
|
|
for(i=0; i<size && i<align; i++){
|
||
|
|
if(buf[i]==0xFF) ff_count++;
|
||
|
|
}
|
||
|
|
for(; i<size-15; i+=16){
|
||
|
|
int acc, v;
|
||
|
|
|
||
|
|
v= *(uint32_t*)(&buf[i]);
|
||
|
|
acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
|
||
|
|
v= *(uint32_t*)(&buf[i+4]);
|
||
|
|
acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
|
||
|
|
v= *(uint32_t*)(&buf[i+8]);
|
||
|
|
acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
|
||
|
|
v= *(uint32_t*)(&buf[i+12]);
|
||
|
|
acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
|
||
|
|
|
||
|
|
acc>>=4;
|
||
|
|
acc+= (acc>>16);
|
||
|
|
acc+= (acc>>8);
|
||
|
|
ff_count+= acc&0xFF;
|
||
|
|
}
|
||
|
|
for(; i<size; i++){
|
||
|
|
if(buf[i]==0xFF) ff_count++;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(ff_count==0) return;
|
||
|
|
|
||
|
|
flush_put_bits(pb);
|
||
|
|
skip_put_bytes(pb, ff_count);
|
||
|
|
|
||
|
|
for(i=size-1; ff_count; i--){
|
||
|
|
int v= buf[i];
|
||
|
|
|
||
|
|
if(v==0xFF){
|
||
|
|
buf[i+ff_count]= 0;
|
||
|
|
ff_count--;
|
||
|
|
}
|
||
|
|
|
||
|
|
buf[i+ff_count]= v;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Builds all 4 optimal Huffman tables.
|
||
|
|
*
|
||
|
|
* Uses the data stored in the JPEG buffer to compute the tables.
|
||
|
|
* Stores the Huffman tables in the bits_* and val_* arrays in the MJpegContext.
|
||
|
|
*
|
||
|
|
* @param m MJpegContext containing the JPEG buffer.
|
||
|
|
*/
|
||
|
|
static void ff_mjpeg_build_optimal_huffman(MJpegContext *m)
|
||
|
|
{
|
||
|
|
int i, table_id, code;
|
||
|
|
|
||
|
|
MJpegEncHuffmanContext dc_luminance_ctx;
|
||
|
|
MJpegEncHuffmanContext dc_chrominance_ctx;
|
||
|
|
MJpegEncHuffmanContext ac_luminance_ctx;
|
||
|
|
MJpegEncHuffmanContext ac_chrominance_ctx;
|
||
|
|
MJpegEncHuffmanContext *ctx[4] = {&dc_luminance_ctx,
|
||
|
|
&dc_chrominance_ctx,
|
||
|
|
&ac_luminance_ctx,
|
||
|
|
&ac_chrominance_ctx};
|
||
|
|
for (i = 0; i < 4; i++) {
|
||
|
|
ff_mjpeg_encode_huffman_init(ctx[i]);
|
||
|
|
}
|
||
|
|
for (i = 0; i < m->huff_ncode; i++) {
|
||
|
|
table_id = m->huff_buffer[i].table_id;
|
||
|
|
code = m->huff_buffer[i].code;
|
||
|
|
|
||
|
|
ff_mjpeg_encode_huffman_increment(ctx[table_id], code);
|
||
|
|
}
|
||
|
|
|
||
|
|
ff_mjpeg_encode_huffman_close(&dc_luminance_ctx,
|
||
|
|
m->bits_dc_luminance,
|
||
|
|
m->val_dc_luminance, 12);
|
||
|
|
ff_mjpeg_encode_huffman_close(&dc_chrominance_ctx,
|
||
|
|
m->bits_dc_chrominance,
|
||
|
|
m->val_dc_chrominance, 12);
|
||
|
|
ff_mjpeg_encode_huffman_close(&ac_luminance_ctx,
|
||
|
|
m->bits_ac_luminance,
|
||
|
|
m->val_ac_luminance, 256);
|
||
|
|
ff_mjpeg_encode_huffman_close(&ac_chrominance_ctx,
|
||
|
|
m->bits_ac_chrominance,
|
||
|
|
m->val_ac_chrominance, 256);
|
||
|
|
|
||
|
|
ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance,
|
||
|
|
m->huff_code_dc_luminance,
|
||
|
|
m->bits_dc_luminance,
|
||
|
|
m->val_dc_luminance);
|
||
|
|
ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
|
||
|
|
m->huff_code_dc_chrominance,
|
||
|
|
m->bits_dc_chrominance,
|
||
|
|
m->val_dc_chrominance);
|
||
|
|
ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
|
||
|
|
m->huff_code_ac_luminance,
|
||
|
|
m->bits_ac_luminance,
|
||
|
|
m->val_ac_luminance);
|
||
|
|
ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
|
||
|
|
m->huff_code_ac_chrominance,
|
||
|
|
m->bits_ac_chrominance,
|
||
|
|
m->val_ac_chrominance);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Writes the complete JPEG frame when optimal huffman tables are enabled,
|
||
|
|
* otherwise writes the stuffing.
|
||
|
|
*
|
||
|
|
* Header + values + stuffing.
|
||
|
|
*
|
||
|
|
* @param s The MpegEncContext.
|
||
|
|
* @return int Error code, 0 if successful.
|
||
|
|
*/
|
||
|
|
int ff_mjpeg_encode_stuffing(MpegEncContext *s)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
PutBitContext *pbc = &s->pb;
|
||
|
|
int mb_y = s->mb_y - !s->mb_x;
|
||
|
|
int ret;
|
||
|
|
MJpegContext *m;
|
||
|
|
|
||
|
|
m = s->mjpeg_ctx;
|
||
|
|
|
||
|
|
if (s->huffman == HUFFMAN_TABLE_OPTIMAL) {
|
||
|
|
ff_mjpeg_build_optimal_huffman(m);
|
||
|
|
|
||
|
|
// Replace the VLCs with the optimal ones.
|
||
|
|
// The default ones may be used for trellis during quantization.
|
||
|
|
ff_init_uni_ac_vlc(m->huff_size_ac_luminance, m->uni_ac_vlc_len);
|
||
|
|
ff_init_uni_ac_vlc(m->huff_size_ac_chrominance, m->uni_chroma_ac_vlc_len);
|
||
|
|
s->intra_ac_vlc_length =
|
||
|
|
s->intra_ac_vlc_last_length = m->uni_ac_vlc_len;
|
||
|
|
s->intra_chroma_ac_vlc_length =
|
||
|
|
s->intra_chroma_ac_vlc_last_length = m->uni_chroma_ac_vlc_len;
|
||
|
|
|
||
|
|
ff_mjpeg_encode_picture_header(s->avctx, &s->pb, &s->intra_scantable,
|
||
|
|
s->pred, s->intra_matrix, s->chroma_intra_matrix);
|
||
|
|
ff_mjpeg_encode_picture_frame(s);
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = ff_mpv_reallocate_putbitbuffer(s, put_bits_count(&s->pb) / 8 + 100,
|
||
|
|
put_bits_count(&s->pb) / 4 + 1000);
|
||
|
|
|
||
|
|
if (ret < 0) {
|
||
|
|
av_log(s->avctx, AV_LOG_ERROR, "Buffer reallocation failed\n");
|
||
|
|
goto fail;
|
||
|
|
}
|
||
|
|
|
||
|
|
ff_mjpeg_escape_FF(pbc, s->esc_pos);
|
||
|
|
|
||
|
|
if((s->avctx->active_thread_type & FF_THREAD_SLICE) && mb_y < s->mb_height - 1)
|
||
|
|
put_marker(pbc, RST0 + (mb_y&7));
|
||
|
|
s->esc_pos = put_bits_count(pbc) >> 3;
|
||
|
|
fail:
|
||
|
|
|
||
|
|
for(i=0; i<3; i++)
|
||
|
|
s->last_dc[i] = 128 << s->intra_dc_precision;
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ff_mjpeg_encode_picture_trailer(PutBitContext *pb, int header_bits)
|
||
|
|
{
|
||
|
|
av_assert1((header_bits & 7) == 0);
|
||
|
|
|
||
|
|
put_marker(pb, EOI);
|
||
|
|
}
|
||
|
|
|
||
|
|
void ff_mjpeg_encode_dc(PutBitContext *pb, int val,
|
||
|
|
uint8_t *huff_size, uint16_t *huff_code)
|
||
|
|
{
|
||
|
|
int mant, nbits;
|
||
|
|
|
||
|
|
if (val == 0) {
|
||
|
|
put_bits(pb, huff_size[0], huff_code[0]);
|
||
|
|
} else {
|
||
|
|
mant = val;
|
||
|
|
if (val < 0) {
|
||
|
|
val = -val;
|
||
|
|
mant--;
|
||
|
|
}
|
||
|
|
|
||
|
|
nbits= av_log2_16bit(val) + 1;
|
||
|
|
|
||
|
|
put_bits(pb, huff_size[nbits], huff_code[nbits]);
|
||
|
|
|
||
|
|
put_sbits(pb, nbits, mant);
|
||
|
|
}
|
||
|
|
}
|