| /* |
| * lossless JPEG shared bits |
| * Copyright (c) 2000, 2001 Fabrice Bellard |
| * Copyright (c) 2003 Alex Beregszaszi |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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. |
| * |
| * FFmpeg 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 FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <stdint.h> |
| #include <string.h> |
| |
| #include "libavutil/common.h" |
| #include "libavutil/pixdesc.h" |
| #include "libavutil/pixfmt.h" |
| |
| #include "avcodec.h" |
| #include "idctdsp.h" |
| #include "jpegtables.h" |
| #include "put_bits.h" |
| #include "mjpegenc.h" |
| #include "mjpegenc_common.h" |
| #include "mjpegenc_huffman.h" |
| #include "mjpeg.h" |
| |
| av_cold void ff_init_uni_ac_vlc(const uint8_t huff_size_ac[256], uint8_t *uni_ac_vlc_len) |
| { |
| int i; |
| |
| for (i = 0; i < 128; i++) { |
| int level = i - 64; |
| int run; |
| if (!level) |
| continue; |
| for (run = 0; run < 64; run++) { |
| int len, code, nbits; |
| int alevel = FFABS(level); |
| |
| len = (run >> 4) * huff_size_ac[0xf0]; |
| |
| nbits= av_log2_16bit(alevel) + 1; |
| code = ((15&run) << 4) | nbits; |
| |
| len += huff_size_ac[code] + nbits; |
| |
| uni_ac_vlc_len[UNI_AC_ENC_INDEX(run, i)] = len; |
| // We ignore EOB as its just a constant which does not change generally |
| } |
| } |
| } |
| |
| /* 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;i<n;i++) |
| put_bits(p, 8, value_table[i]); |
| |
| return n + 17; |
| } |
| |
| static void jpeg_table_header(AVCodecContext *avctx, PutBitContext *p, |
| ScanTable *intra_scantable, |
| uint16_t luma_intra_matrix[64], |
| uint16_t chroma_intra_matrix[64], |
| int hsample[3]) |
| { |
| int i, j, size; |
| uint8_t *ptr; |
| MpegEncContext *s = NULL; |
| |
| /* Since avctx->priv_data will point to LJpegEncContext in this case */ |
| if (avctx->codec_id != AV_CODEC_ID_LJPEG) |
| s = avctx->priv_data; |
| |
| if (avctx->codec_id != AV_CODEC_ID_LJPEG) { |
| int matrix_count = 1 + !!memcmp(luma_intra_matrix, |
| chroma_intra_matrix, |
| sizeof(luma_intra_matrix[0]) * 64); |
| if (s && s->force_duplicated_matrix) |
| matrix_count = 2; |
| /* quant matrixes */ |
| put_marker(p, DQT); |
| put_bits(p, 16, 2 + matrix_count * (1 + 64)); |
| put_bits(p, 4, 0); /* 8 bit precision */ |
| put_bits(p, 4, 0); /* table 0 */ |
| for(i=0;i<64;i++) { |
| j = intra_scantable->permutated[i]; |
| put_bits(p, 8, luma_intra_matrix[j]); |
| } |
| |
| if (matrix_count > 1) { |
| put_bits(p, 4, 0); /* 8 bit precision */ |
| put_bits(p, 4, 1); /* table 1 */ |
| for(i=0;i<64;i++) { |
| j = intra_scantable->permutated[i]; |
| put_bits(p, 8, chroma_intra_matrix[j]); |
| } |
| } |
| } |
| |
| if(avctx->active_thread_type & FF_THREAD_SLICE){ |
| put_marker(p, DRI); |
| put_bits(p, 16, 4); |
| put_bits(p, 16, (avctx->width-1)/(8*hsample[0]) + 1); |
| } |
| |
| /* huffman table */ |
| put_marker(p, DHT); |
| flush_put_bits(p); |
| ptr = put_bits_ptr(p); |
| put_bits(p, 16, 0); /* patched later */ |
| size = 2; |
| |
| // Only MJPEG can have a variable Huffman variable. All other |
| // formats use the default Huffman table. |
| if (s && s->huffman == HUFFMAN_TABLE_OPTIMAL) { |
| size += put_huffman_table(p, 0, 0, s->mjpeg_ctx->bits_dc_luminance, |
| s->mjpeg_ctx->val_dc_luminance); |
| size += put_huffman_table(p, 0, 1, s->mjpeg_ctx->bits_dc_chrominance, |
| s->mjpeg_ctx->val_dc_chrominance); |
| |
| size += put_huffman_table(p, 1, 0, s->mjpeg_ctx->bits_ac_luminance, |
| s->mjpeg_ctx->val_ac_luminance); |
| size += put_huffman_table(p, 1, 1, s->mjpeg_ctx->bits_ac_chrominance, |
| s->mjpeg_ctx->val_ac_chrominance); |
| } else { |
| 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) { |
| AVRational sar = avctx->sample_aspect_ratio; |
| |
| if (sar.num > 65535 || sar.den > 65535) { |
| if (!av_reduce(&sar.num, &sar.den, avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den, 65535)) |
| av_log(avctx, AV_LOG_WARNING, |
| "Cannot store exact aspect ratio %d:%d\n", |
| avctx->sample_aspect_ratio.num, |
| avctx->sample_aspect_ratio.den); |
| } |
| |
| /* JFIF header */ |
| put_marker(p, APP0); |
| put_bits(p, 16, 16); |
| ff_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */ |
| /* The most significant byte is used for major revisions, the least |
| * significant byte for minor revisions. Version 1.02 is the current |
| * released revision. */ |
| put_bits(p, 16, 0x0102); |
| put_bits(p, 8, 0); /* units type: 0 - aspect ratio */ |
| put_bits(p, 16, sar.num); |
| put_bits(p, 16, sar.den); |
| put_bits(p, 8, 0); /* thumbnail width */ |
| put_bits(p, 8, 0); /* thumbnail height */ |
| } |
| |
| /* comment */ |
| if (!(avctx->flags & AV_CODEC_FLAG_BITEXACT)) { |
| put_marker(p, COM); |
| flush_put_bits(p); |
| ptr = put_bits_ptr(p); |
| put_bits(p, 16, 0); /* patched later */ |
| ff_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) && avctx->color_range != AVCOL_RANGE_JPEG) |
| || avctx->color_range == AVCOL_RANGE_MPEG) { |
| put_marker(p, COM); |
| flush_put_bits(p); |
| ptr = put_bits_ptr(p); |
| put_bits(p, 16, 0); /* patched later */ |
| ff_put_string(p, "CS=ITU601", 1); |
| size = strlen("CS=ITU601")+3; |
| AV_WB16(ptr, size); |
| } |
| } |
| |
| void ff_mjpeg_init_hvsample(AVCodecContext *avctx, int hsample[4], int vsample[4]) |
| { |
| int chroma_h_shift, chroma_v_shift; |
| |
| 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_BGR0 |
| || avctx->pix_fmt == AV_PIX_FMT_BGRA |
| || avctx->pix_fmt == AV_PIX_FMT_BGR24)) { |
| vsample[0] = hsample[0] = |
| vsample[1] = hsample[1] = |
| vsample[2] = hsample[2] = |
| vsample[3] = hsample[3] = 1; |
| } else if (avctx->pix_fmt == AV_PIX_FMT_YUV444P || avctx->pix_fmt == AV_PIX_FMT_YUVJ444P) { |
| vsample[0] = vsample[1] = vsample[2] = 2; |
| hsample[0] = hsample[1] = 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; |
| } |
| } |
| |
| void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb, |
| ScanTable *intra_scantable, int pred, |
| uint16_t luma_intra_matrix[64], |
| uint16_t chroma_intra_matrix[64]) |
| { |
| const int lossless = avctx->codec_id != AV_CODEC_ID_MJPEG && avctx->codec_id != AV_CODEC_ID_AMV; |
| int hsample[4], vsample[4]; |
| int i; |
| int components = 3 + (avctx->pix_fmt == AV_PIX_FMT_BGRA); |
| int chroma_matrix = !!memcmp(luma_intra_matrix, |
| chroma_intra_matrix, |
| sizeof(luma_intra_matrix[0])*64); |
| |
| ff_mjpeg_init_hvsample(avctx, hsample, vsample); |
| |
| put_marker(pb, SOI); |
| |
| // hack for AMV mjpeg format |
| if(avctx->codec_id == AV_CODEC_ID_AMV) goto end; |
| |
| jpeg_put_comments(avctx, pb); |
| |
| jpeg_table_header(avctx, pb, intra_scantable, luma_intra_matrix, chroma_intra_matrix, hsample); |
| |
| 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: av_assert0(0); |
| } |
| |
| put_bits(pb, 16, 17); |
| if (lossless && ( avctx->pix_fmt == AV_PIX_FMT_BGR0 |
| || avctx->pix_fmt == AV_PIX_FMT_BGRA |
| || 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, components); /* 3 or 4 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, lossless ? 0 : chroma_matrix); /* 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, lossless ? 0 : chroma_matrix); /* select matrix */ |
| |
| if (components == 4) { |
| put_bits(pb, 8, 4); /* component number */ |
| put_bits(pb, 4, hsample[3]); /* H factor */ |
| put_bits(pb, 4, vsample[3]); /* V factor */ |
| put_bits(pb, 8, 0); /* select matrix */ |
| } |
| |
| /* scan header */ |
| put_marker(pb, SOS); |
| put_bits(pb, 16, 6 + 2*components); /* length */ |
| put_bits(pb, 8, components); /* 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 */ |
| |
| 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); |
| } |
| } |
