mirror of
https://github.com/FFmpeg/FFmpeg.git
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318 lines
9.1 KiB
C
318 lines
9.1 KiB
C
/*
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* lossless JPEG shared bits
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "dsputil.h"
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#include "put_bits.h"
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#include "mjpegenc_common.h"
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#include "mjpeg.h"
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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(PutBitContext *p, ScanTable *intra_scantable,
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uint16_t intra_matrix[64])
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{
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int i, j, size;
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uint8_t *ptr;
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/* quant matrixes */
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put_marker(p, DQT);
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put_bits(p, 16, 2 + 1 * (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, intra_matrix[j]);
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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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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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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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/* 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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put_bits(p, 16, 0x0201); /* v 1.02 */
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put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
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put_bits(p, 16, avctx->sample_aspect_ratio.num);
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put_bits(p, 16, avctx->sample_aspect_ratio.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 & 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) {
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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_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
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ScanTable *intra_scantable,
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uint16_t intra_matrix[64])
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{
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int chroma_h_shift, chroma_v_shift;
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const int lossless = avctx->codec_id != AV_CODEC_ID_MJPEG;
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int hsample[3], vsample[3];
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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_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] = 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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put_marker(pb, SOI);
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jpeg_put_comments(avctx, pb);
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jpeg_table_header(pb, intra_scantable, intra_matrix);
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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: assert(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_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, 3); /* 3 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, 0); /* 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, 0); /* select matrix */
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/* scan header */
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put_marker(pb, SOS);
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put_bits(pb, 16, 12); /* length */
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put_bits(pb, 8, 3); /* 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 */
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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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put_bits(pb, 8, lossless ? avctx->prediction_method + 1 : 0); /* Ss (not used) */
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switch (avctx->codec_id) {
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case AV_CODEC_ID_MJPEG: put_bits(pb, 8, 63); break; /* Se (not used) */
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case AV_CODEC_ID_LJPEG: put_bits(pb, 8, 0); break; /* not used */
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default: assert(0);
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}
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put_bits(pb, 8, 0); /* Ah/Al (not used) */
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}
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static void escape_FF(PutBitContext *pb, int start)
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{
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int size = put_bits_count(pb) - start * 8;
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int i, ff_count;
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uint8_t *buf = pb->buf + start;
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int align= (-(size_t)(buf))&3;
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assert((size&7) == 0);
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size >>= 3;
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ff_count=0;
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for(i=0; i<size && i<align; i++){
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if(buf[i]==0xFF) ff_count++;
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}
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for(; i<size-15; i+=16){
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int acc, v;
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v= *(uint32_t*)(&buf[i]);
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acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
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v= *(uint32_t*)(&buf[i+4]);
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acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
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v= *(uint32_t*)(&buf[i+8]);
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acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
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v= *(uint32_t*)(&buf[i+12]);
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acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
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acc>>=4;
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acc+= (acc>>16);
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acc+= (acc>>8);
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ff_count+= acc&0xFF;
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}
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for(; i<size; i++){
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if(buf[i]==0xFF) ff_count++;
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}
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if(ff_count==0) return;
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flush_put_bits(pb);
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skip_put_bytes(pb, ff_count);
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for(i=size-1; ff_count; i--){
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int v= buf[i];
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if(v==0xFF){
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buf[i+ff_count]= 0;
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ff_count--;
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}
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buf[i+ff_count]= v;
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}
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}
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void ff_mjpeg_encode_stuffing(PutBitContext * pbc)
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{
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int length;
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length= (-put_bits_count(pbc))&7;
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if(length) put_bits(pbc, length, (1<<length)-1);
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}
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void ff_mjpeg_encode_picture_trailer(PutBitContext *pb, int header_bits)
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{
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ff_mjpeg_encode_stuffing(pb);
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flush_put_bits(pb);
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assert((header_bits & 7) == 0);
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escape_FF(pb, header_bits >> 3);
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put_marker(pb, EOI);
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}
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void ff_mjpeg_encode_dc(PutBitContext *pb, int val,
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uint8_t *huff_size, uint16_t *huff_code)
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{
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int mant, nbits;
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if (val == 0) {
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put_bits(pb, huff_size[0], huff_code[0]);
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} else {
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mant = val;
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if (val < 0) {
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val = -val;
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mant--;
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}
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nbits= av_log2_16bit(val) + 1;
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put_bits(pb, huff_size[nbits], huff_code[nbits]);
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put_sbits(pb, nbits, mant);
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}
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}
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