From adcb8392c9b185fd8a91a95fa256d15ab1432a30 Mon Sep 17 00:00:00 2001 From: Diego Biurrun Date: Mon, 30 Jun 2014 05:37:59 -0700 Subject: mjpeg: Split off bits shared by MJPEG and LJPEG encoders This obviates a dependency of the LJPEG encoder on mpegvideo. --- libavcodec/mjpegenc_common.c | 317 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 317 insertions(+) create mode 100644 libavcodec/mjpegenc_common.c (limited to 'libavcodec/mjpegenc_common.c') diff --git a/libavcodec/mjpegenc_common.c b/libavcodec/mjpegenc_common.c new file mode 100644 index 0000000000..3dba414f1d --- /dev/null +++ b/libavcodec/mjpegenc_common.c @@ -0,0 +1,317 @@ +/* + * lossless JPEG shared bits + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include +#include + +#include "libavutil/common.h" +#include "libavutil/pixdesc.h" +#include "libavutil/pixfmt.h" + +#include "avcodec.h" +#include "dsputil.h" +#include "put_bits.h" +#include "mjpegenc_common.h" +#include "mjpeg.h" + +/* table_class: 0 = DC coef, 1 = AC coefs */ +static int put_huffman_table(PutBitContext *p, int table_class, int table_id, + const uint8_t *bits_table, const uint8_t *value_table) +{ + int n, i; + + put_bits(p, 4, table_class); + put_bits(p, 4, table_id); + + n = 0; + for(i=1;i<=16;i++) { + n += bits_table[i]; + put_bits(p, 8, bits_table[i]); + } + + for(i=0;ipermutated[i]; + put_bits(p, 8, intra_matrix[j]); + } + + /* huffman table */ + put_marker(p, DHT); + flush_put_bits(p); + ptr = put_bits_ptr(p); + put_bits(p, 16, 0); /* patched later */ + size = 2; + size += put_huffman_table(p, 0, 0, avpriv_mjpeg_bits_dc_luminance, + avpriv_mjpeg_val_dc); + size += put_huffman_table(p, 0, 1, avpriv_mjpeg_bits_dc_chrominance, + avpriv_mjpeg_val_dc); + + size += put_huffman_table(p, 1, 0, avpriv_mjpeg_bits_ac_luminance, + avpriv_mjpeg_val_ac_luminance); + size += put_huffman_table(p, 1, 1, avpriv_mjpeg_bits_ac_chrominance, + avpriv_mjpeg_val_ac_chrominance); + AV_WB16(ptr, size); +} + +static void jpeg_put_comments(AVCodecContext *avctx, PutBitContext *p) +{ + int size; + uint8_t *ptr; + + if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0) { + /* JFIF header */ + put_marker(p, APP0); + put_bits(p, 16, 16); + avpriv_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */ + put_bits(p, 16, 0x0201); /* v 1.02 */ + put_bits(p, 8, 0); /* units type: 0 - aspect ratio */ + put_bits(p, 16, avctx->sample_aspect_ratio.num); + put_bits(p, 16, avctx->sample_aspect_ratio.den); + put_bits(p, 8, 0); /* thumbnail width */ + put_bits(p, 8, 0); /* thumbnail height */ + } + + /* comment */ + if (!(avctx->flags & CODEC_FLAG_BITEXACT)) { + put_marker(p, COM); + flush_put_bits(p); + ptr = put_bits_ptr(p); + put_bits(p, 16, 0); /* patched later */ + avpriv_put_string(p, LIBAVCODEC_IDENT, 1); + size = strlen(LIBAVCODEC_IDENT)+3; + AV_WB16(ptr, size); + } + + if (avctx->pix_fmt == AV_PIX_FMT_YUV420P || + avctx->pix_fmt == AV_PIX_FMT_YUV422P || + avctx->pix_fmt == AV_PIX_FMT_YUV444P) { + put_marker(p, COM); + flush_put_bits(p); + ptr = put_bits_ptr(p); + put_bits(p, 16, 0); /* patched later */ + avpriv_put_string(p, "CS=ITU601", 1); + size = strlen("CS=ITU601")+3; + AV_WB16(ptr, size); + } +} + +void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb, + ScanTable *intra_scantable, + uint16_t intra_matrix[64]) +{ + int chroma_h_shift, chroma_v_shift; + const int lossless = avctx->codec_id != AV_CODEC_ID_MJPEG; + int hsample[3], vsample[3]; + + av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift, + &chroma_v_shift); + + if (avctx->codec->id == AV_CODEC_ID_LJPEG && + avctx->pix_fmt == AV_PIX_FMT_BGR24) { + vsample[0] = hsample[0] = + vsample[1] = hsample[1] = + vsample[2] = hsample[2] = 1; + } else { + vsample[0] = 2; + vsample[1] = 2 >> chroma_v_shift; + vsample[2] = 2 >> chroma_v_shift; + hsample[0] = 2; + hsample[1] = 2 >> chroma_h_shift; + hsample[2] = 2 >> chroma_h_shift; + } + + put_marker(pb, SOI); + + jpeg_put_comments(avctx, pb); + + jpeg_table_header(pb, intra_scantable, intra_matrix); + + switch (avctx->codec_id) { + case AV_CODEC_ID_MJPEG: put_marker(pb, SOF0 ); break; + case AV_CODEC_ID_LJPEG: put_marker(pb, SOF3 ); break; + default: assert(0); + } + + put_bits(pb, 16, 17); + if (lossless && avctx->pix_fmt == AV_PIX_FMT_BGR24) + put_bits(pb, 8, 9); /* 9 bits/component RCT */ + else + put_bits(pb, 8, 8); /* 8 bits/component */ + put_bits(pb, 16, avctx->height); + put_bits(pb, 16, avctx->width); + put_bits(pb, 8, 3); /* 3 components */ + + /* Y component */ + put_bits(pb, 8, 1); /* component number */ + put_bits(pb, 4, hsample[0]); /* H factor */ + put_bits(pb, 4, vsample[0]); /* V factor */ + put_bits(pb, 8, 0); /* select matrix */ + + /* Cb component */ + put_bits(pb, 8, 2); /* component number */ + put_bits(pb, 4, hsample[1]); /* H factor */ + put_bits(pb, 4, vsample[1]); /* V factor */ + put_bits(pb, 8, 0); /* select matrix */ + + /* Cr component */ + put_bits(pb, 8, 3); /* component number */ + put_bits(pb, 4, hsample[2]); /* H factor */ + put_bits(pb, 4, vsample[2]); /* V factor */ + put_bits(pb, 8, 0); /* select matrix */ + + /* scan header */ + put_marker(pb, SOS); + put_bits(pb, 16, 12); /* length */ + put_bits(pb, 8, 3); /* 3 components */ + + /* Y component */ + put_bits(pb, 8, 1); /* index */ + put_bits(pb, 4, 0); /* DC huffman table index */ + put_bits(pb, 4, 0); /* AC huffman table index */ + + /* Cb component */ + put_bits(pb, 8, 2); /* index */ + put_bits(pb, 4, 1); /* DC huffman table index */ + put_bits(pb, 4, lossless ? 0 : 1); /* AC huffman table index */ + + /* Cr component */ + 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 */ + + put_bits(pb, 8, lossless ? avctx->prediction_method + 1 : 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: assert(0); + } + + put_bits(pb, 8, 0); /* Ah/Al (not used) */ +} + +static void escape_FF(PutBitContext *pb, int start) +{ + int size = put_bits_count(pb) - start * 8; + int i, ff_count; + uint8_t *buf = pb->buf + start; + int align= (-(size_t)(buf))&3; + + assert((size&7) == 0); + size >>= 3; + + ff_count=0; + for(i=0; i>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> 3); + + 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); + } +} -- cgit v1.2.3