[deb_ffmpeg.git] / ffmpeg / libavcodec / mjpegenc_common.c

/*
 * 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 "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;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;

    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);
    /* 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;
    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, 0x0102);         /* 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_init_hvsample(AVCodecContext *avctx, int hsample[3], int vsample[3])
{
    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] = 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,
                                    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[3], vsample[3];
    int i;
    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, 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, 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 */

    /* 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: 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;
    }
}

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;
    }
}

void ff_mjpeg_encode_stuffing(MpegEncContext *s)
{
    int i;
    PutBitContext *pbc = &s->pb;
    int mb_y = s->mb_y - !s->mb_x;

    ff_mjpeg_escape_FF(pbc, s->esc_pos);

    if((s->avctx->active_thread_type & FF_THREAD_SLICE) && mb_y < s->mb_height)
        put_marker(pbc, RST0 + (mb_y&7));
    s->esc_pos = put_bits_count(pbc) >> 3;

    for(i=0; i<3; i++)
        s->last_dc[i] = 128 << s->intra_dc_precision;
}

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);
    }
}
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* lossless JPEG shared bits
	3	* Copyright (c) 2000, 2001 Fabrice Bellard
	4	* Copyright (c) 2003 Alex Beregszaszi
	5	*
	6	* This file is part of FFmpeg.
	7	*
	8	* FFmpeg is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public
	10	* License as published by the Free Software Foundation; either
	11	* version 2.1 of the License, or (at your option) any later version.
	12	*
	13	* FFmpeg is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* Lesser General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public
	19	* License along with FFmpeg; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	21	*/
	22
	23	#include <stdint.h>
	24	#include <string.h>
	25
	26	#include "libavutil/common.h"
	27	#include "libavutil/pixdesc.h"
	28	#include "libavutil/pixfmt.h"
	29
	30	#include "avcodec.h"
	31	#include "idctdsp.h"
	32	#include "put_bits.h"
	33	#include "mjpegenc_common.h"
	34	#include "mjpeg.h"
	35
	36	/* table_class: 0 = DC coef, 1 = AC coefs */
	37	static int put_huffman_table(PutBitContext *p, int table_class, int table_id,
	38	const uint8_t bits_table, const uint8_t value_table)
	39	{
	40	int n, i;
	41
	42	put_bits(p, 4, table_class);
	43	put_bits(p, 4, table_id);
	44
	45	n = 0;
	46	for(i=1;i<=16;i++) {
	47	n += bits_table[i];
	48	put_bits(p, 8, bits_table[i]);
	49	}
	50
	51	for(i=0;i<n;i++)
	52	put_bits(p, 8, value_table[i]);
	53
	54	return n + 17;
	55	}
	56
	57	static void jpeg_table_header(AVCodecContext avctx, PutBitContext p,
	58	ScanTable *intra_scantable,
	59	uint16_t luma_intra_matrix[64],
	60	uint16_t chroma_intra_matrix[64],
	61	int hsample[3])
	62	{
	63	int i, j, size;
	64	uint8_t *ptr;
65
66	if (avctx->codec_id != AV_CODEC_ID_LJPEG) {
67	int matrix_count = 1 + !!memcmp(luma_intra_matrix,
68	chroma_intra_matrix,
69	sizeof(luma_intra_matrix[0]) * 64);
70	/* quant matrixes */
71	put_marker(p, DQT);
72	put_bits(p, 16, 2 + matrix_count * (1 + 64));
73	put_bits(p, 4, 0); /* 8 bit precision */
74	put_bits(p, 4, 0); /* table 0 */
75	for(i=0;i<64;i++) {
76	j = intra_scantable->permutated[i];
77	put_bits(p, 8, luma_intra_matrix[j]);
78	}
79
80	if (matrix_count > 1) {
81	put_bits(p, 4, 0); /* 8 bit precision */
82	put_bits(p, 4, 1); /* table 1 */
83	for(i=0;i<64;i++) {
84	j = intra_scantable->permutated[i];
85	put_bits(p, 8, chroma_intra_matrix[j]);
86	}
87	}
88	}
89
90	if(avctx->active_thread_type & FF_THREAD_SLICE){
91	put_marker(p, DRI);
92	put_bits(p, 16, 4);
93	put_bits(p, 16, (avctx->width-1)/(8*hsample[0]) + 1);
94	}
95
96	/* huffman table */
97	put_marker(p, DHT);
98	flush_put_bits(p);
99	ptr = put_bits_ptr(p);
100	put_bits(p, 16, 0); /* patched later */
101	size = 2;
102	size += put_huffman_table(p, 0, 0, avpriv_mjpeg_bits_dc_luminance,
103	avpriv_mjpeg_val_dc);
104	size += put_huffman_table(p, 0, 1, avpriv_mjpeg_bits_dc_chrominance,
105	avpriv_mjpeg_val_dc);
106
107	size += put_huffman_table(p, 1, 0, avpriv_mjpeg_bits_ac_luminance,
108	avpriv_mjpeg_val_ac_luminance);
109	size += put_huffman_table(p, 1, 1, avpriv_mjpeg_bits_ac_chrominance,
110	avpriv_mjpeg_val_ac_chrominance);
111	AV_WB16(ptr, size);
112	}
113
114	static void jpeg_put_comments(AVCodecContext avctx, PutBitContext p)
115	{
116	int size;
117	uint8_t *ptr;
118
119	if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0) {
120	/* JFIF header */
121	put_marker(p, APP0);
122	put_bits(p, 16, 16);
123	avpriv_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */
124	put_bits(p, 16, 0x0102); /* v 1.02 */
125	put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
126	put_bits(p, 16, avctx->sample_aspect_ratio.num);
127	put_bits(p, 16, avctx->sample_aspect_ratio.den);
128	put_bits(p, 8, 0); /* thumbnail width */
129	put_bits(p, 8, 0); /* thumbnail height */
130	}
131
132	/* comment */
133	if (!(avctx->flags & CODEC_FLAG_BITEXACT)) {
134	put_marker(p, COM);
135	flush_put_bits(p);
136	ptr = put_bits_ptr(p);
137	put_bits(p, 16, 0); /* patched later */
138	avpriv_put_string(p, LIBAVCODEC_IDENT, 1);
139	size = strlen(LIBAVCODEC_IDENT)+3;
140	AV_WB16(ptr, size);
141	}
142
143	if (avctx->pix_fmt == AV_PIX_FMT_YUV420P \|\|
144	avctx->pix_fmt == AV_PIX_FMT_YUV422P \|\|
145	avctx->pix_fmt == AV_PIX_FMT_YUV444P) {
146	put_marker(p, COM);
147	flush_put_bits(p);
148	ptr = put_bits_ptr(p);
149	put_bits(p, 16, 0); /* patched later */
150	avpriv_put_string(p, "CS=ITU601", 1);
151	size = strlen("CS=ITU601")+3;
152	AV_WB16(ptr, size);
153	}
154	}
155
156	void ff_mjpeg_init_hvsample(AVCodecContext *avctx, int hsample[3], int vsample[3])
157	{
158	int chroma_h_shift, chroma_v_shift;
159
160	av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift,
161	&chroma_v_shift);
162	if (avctx->codec->id == AV_CODEC_ID_LJPEG &&
163	( avctx->pix_fmt == AV_PIX_FMT_BGR0
164	\|\| avctx->pix_fmt == AV_PIX_FMT_BGRA
165	\|\| avctx->pix_fmt == AV_PIX_FMT_BGR24)) {
166	vsample[0] = hsample[0] =
167	vsample[1] = hsample[1] =
168	vsample[2] = hsample[2] = 1;
169	} else if (avctx->pix_fmt == AV_PIX_FMT_YUV444P \|\| avctx->pix_fmt == AV_PIX_FMT_YUVJ444P) {
170	vsample[0] = vsample[1] = vsample[2] = 2;
171	hsample[0] = hsample[1] = hsample[2] = 1;
172	} else {
173	vsample[0] = 2;
174	vsample[1] = 2 >> chroma_v_shift;
175	vsample[2] = 2 >> chroma_v_shift;
176	hsample[0] = 2;
177	hsample[1] = 2 >> chroma_h_shift;
178	hsample[2] = 2 >> chroma_h_shift;
179	}
180	}
181
182	void ff_mjpeg_encode_picture_header(AVCodecContext avctx, PutBitContext pb,
183	ScanTable *intra_scantable,
184	uint16_t luma_intra_matrix[64],
185	uint16_t chroma_intra_matrix[64])
186	{
187	const int lossless = avctx->codec_id != AV_CODEC_ID_MJPEG && avctx->codec_id != AV_CODEC_ID_AMV;
188	int hsample[3], vsample[3];
189	int i;
190	int chroma_matrix = !!memcmp(luma_intra_matrix,
191	chroma_intra_matrix,
192	sizeof(luma_intra_matrix[0])*64);
193
194	ff_mjpeg_init_hvsample(avctx, hsample, vsample);
195
196	put_marker(pb, SOI);
197
198	// hack for AMV mjpeg format
199	if(avctx->codec_id == AV_CODEC_ID_AMV) goto end;
200
201	jpeg_put_comments(avctx, pb);
202
203	jpeg_table_header(avctx, pb, intra_scantable, luma_intra_matrix, chroma_intra_matrix, hsample);
204
205	switch (avctx->codec_id) {
206	case AV_CODEC_ID_MJPEG: put_marker(pb, SOF0 ); break;
207	case AV_CODEC_ID_LJPEG: put_marker(pb, SOF3 ); break;
208	default: av_assert0(0);
209	}
210
211	put_bits(pb, 16, 17);
212	if (lossless && ( avctx->pix_fmt == AV_PIX_FMT_BGR0
213	\|\| avctx->pix_fmt == AV_PIX_FMT_BGRA
214	\|\| avctx->pix_fmt == AV_PIX_FMT_BGR24))
215	put_bits(pb, 8, 9); /* 9 bits/component RCT */
216	else
217	put_bits(pb, 8, 8); /* 8 bits/component */
218	put_bits(pb, 16, avctx->height);
219	put_bits(pb, 16, avctx->width);
220	put_bits(pb, 8, 3); /* 3 components */
221
222	/* Y component */
223	put_bits(pb, 8, 1); /* component number */
224	put_bits(pb, 4, hsample[0]); /* H factor */
225	put_bits(pb, 4, vsample[0]); /* V factor */
226	put_bits(pb, 8, 0); /* select matrix */
227
228	/* Cb component */
229	put_bits(pb, 8, 2); /* component number */
230	put_bits(pb, 4, hsample[1]); /* H factor */
231	put_bits(pb, 4, vsample[1]); /* V factor */
232	put_bits(pb, 8, lossless ? 0 : chroma_matrix); /* select matrix */
233
234	/* Cr component */
235	put_bits(pb, 8, 3); /* component number */
236	put_bits(pb, 4, hsample[2]); /* H factor */
237	put_bits(pb, 4, vsample[2]); /* V factor */
238	put_bits(pb, 8, lossless ? 0 : chroma_matrix); /* select matrix */
239
240	/* scan header */
241	put_marker(pb, SOS);
242	put_bits(pb, 16, 12); /* length */
243	put_bits(pb, 8, 3); /* 3 components */
244
245	/* Y component */
246	put_bits(pb, 8, 1); /* index */
247	put_bits(pb, 4, 0); /* DC huffman table index */
248	put_bits(pb, 4, 0); /* AC huffman table index */
249
250	/* Cb component */
251	put_bits(pb, 8, 2); /* index */
252	put_bits(pb, 4, 1); /* DC huffman table index */
253	put_bits(pb, 4, lossless ? 0 : 1); /* AC huffman table index */
254
255	/* Cr component */
256	put_bits(pb, 8, 3); /* index */
257	put_bits(pb, 4, 1); /* DC huffman table index */
258	put_bits(pb, 4, lossless ? 0 : 1); /* AC huffman table index */
259
260	put_bits(pb, 8, lossless ? avctx->prediction_method + 1 : 0); /* Ss (not used) */
261
262	switch (avctx->codec_id) {
263	case AV_CODEC_ID_MJPEG: put_bits(pb, 8, 63); break; /* Se (not used) */
264	case AV_CODEC_ID_LJPEG: put_bits(pb, 8, 0); break; /* not used */
265	default: av_assert0(0);
266	}
267
268	put_bits(pb, 8, 0); /* Ah/Al (not used) */
269
270	end:
271	if (!lossless) {
272	MpegEncContext *s = avctx->priv_data;
273	av_assert0(avctx->codec->priv_data_size == sizeof(MpegEncContext));
274
275	s->esc_pos = put_bits_count(pb) >> 3;
276	for(i=1; i<s->slice_context_count; i++)
277	s->thread_context[i]->esc_pos = 0;
278	}
279	}
280
281	void ff_mjpeg_escape_FF(PutBitContext *pb, int start)
282	{
283	int size;
284	int i, ff_count;
285	uint8_t *buf = pb->buf + start;
286	int align= (-(size_t)(buf))&3;
287	int pad = (-put_bits_count(pb))&7;
288
289	if (pad)
290	put_bits(pb, pad, (1<<pad)-1);
291
292	flush_put_bits(pb);
293	size = put_bits_count(pb) - start * 8;
294
295	av_assert1((size&7) == 0);
296	size >>= 3;
297
298	ff_count=0;
299	for(i=0; i<size && i<align; i++){
300	if(buf[i]==0xFF) ff_count++;
301	}
302	for(; i<size-15; i+=16){
303	int acc, v;
304
305	v= (uint32_t)(&buf[i]);
306	acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
307	v= (uint32_t)(&buf[i+4]);
308	acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
309	v= (uint32_t)(&buf[i+8]);
310	acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
311	v= (uint32_t)(&buf[i+12]);
312	acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
313
314	acc>>=4;
315	acc+= (acc>>16);
316	acc+= (acc>>8);
317	ff_count+= acc&0xFF;
318	}
319	for(; i<size; i++){
320	if(buf[i]==0xFF) ff_count++;
321	}
322
323	if(ff_count==0) return;
324
325	flush_put_bits(pb);
326	skip_put_bytes(pb, ff_count);
327
328	for(i=size-1; ff_count; i--){
329	int v= buf[i];
330
331	if(v==0xFF){
332	buf[i+ff_count]= 0;
333	ff_count--;
334	}
335
336	buf[i+ff_count]= v;
337	}
338	}
339
340	void ff_mjpeg_encode_stuffing(MpegEncContext *s)
341	{
342	int i;
343	PutBitContext *pbc = &s->pb;
344	int mb_y = s->mb_y - !s->mb_x;
345
346	ff_mjpeg_escape_FF(pbc, s->esc_pos);
347
348	if((s->avctx->active_thread_type & FF_THREAD_SLICE) && mb_y < s->mb_height)
349	put_marker(pbc, RST0 + (mb_y&7));
350	s->esc_pos = put_bits_count(pbc) >> 3;
351
352	for(i=0; i<3; i++)
353	s->last_dc[i] = 128 << s->intra_dc_precision;
354	}
355
356	void ff_mjpeg_encode_picture_trailer(PutBitContext *pb, int header_bits)
357	{
358	av_assert1((header_bits & 7) == 0);
359
360	put_marker(pb, EOI);
361	}
362
363	void ff_mjpeg_encode_dc(PutBitContext *pb, int val,
364	uint8_t huff_size, uint16_t huff_code)
365	{
366	int mant, nbits;
367
368	if (val == 0) {
369	put_bits(pb, huff_size[0], huff_code[0]);
370	} else {
371	mant = val;
372	if (val < 0) {
373	val = -val;
374	mant--;
375	}
376
377	nbits= av_log2_16bit(val) + 1;
378
379	put_bits(pb, huff_size[nbits], huff_code[nbits]);
380
381	put_sbits(pb, nbits, mant);
382	}
383	}