mjpeg: Split off bits shared by MJPEG and LJPEG encoders

This obviates a dependency of the LJPEG encoder on mpegvideo.

1 files changed, 1 insertions, 285 deletions

diff --git a/libavcodec/mjpegenc.c b/libavcodec/mjpegenc.c
index 30433c3ff6..9ce07def8f 100644
--- a/libavcodec/mjpegenc.c
+++ b/libavcodec/mjpegenc.c
@@ -35,6 +35,7 @@
 #include "libavutil/pixdesc.h"
 
 #include "avcodec.h"
+#include "mjpegenc_common.h"
 #include "mpegvideo.h"
 #include "mjpeg.h"
 #include "mjpegenc.h"
@@ -77,291 +78,6 @@ void ff_mjpeg_encode_close(MpegEncContext *s)
     av_free(s->mjpeg_ctx);
 }
 
-/* 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(PutBitContext *p, ScanTable *intra_scantable,
-                              uint16_t intra_matrix[64])
-{
-    int i, j, size;
-    uint8_t *ptr;
-
-    /* quant matrixes */
-    put_marker(p, DQT);
-    put_bits(p, 16, 2 + 1 * (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, 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<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(PutBitContext * pbc)
-{
-    int length;
-    length= (-put_bits_count(pbc))&7;
-    if(length) put_bits(pbc, length, (1<<length)-1);
-}
-
-void ff_mjpeg_encode_picture_trailer(PutBitContext *pb, int header_bits)
-{
-    ff_mjpeg_encode_stuffing(pb);
-    flush_put_bits(pb);
-
-    assert((header_bits & 7) == 0);
-
-    escape_FF(pb, header_bits >> 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);
-    }
-}
-
 static void encode_block(MpegEncContext *s, int16_t *block, int n)
 {
     int mant, nbits, code, i, j;