--- /dev/null
+/*
+ * MJPEG encoder and decoder
+ * Copyright (c) 2000, 2001 Fabrice Bellard.
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Support for external huffman table, various fixes (AVID workaround),
+ * aspecting, new decode_frame mechanism and apple mjpeg-b support
+ * by Alex Beregszaszi <alex@naxine.org>
+ */
+
+/**
+ * @file mjpeg.c
+ * MJPEG encoder and decoder.
+ */
+
+//#define DEBUG
+#include <assert.h>
+
+#include "avcodec.h"
+#include "dsputil.h"
+#include "mpegvideo.h"
+
+/* use two quantizer tables (one for luminance and one for chrominance) */
+/* not yet working */
+#undef TWOMATRIXES
+
+typedef struct MJpegContext {
+ uint8_t huff_size_dc_luminance[12]; //FIXME use array [3] instead of lumi / chrom, for easier addressing
+ uint16_t huff_code_dc_luminance[12];
+ uint8_t huff_size_dc_chrominance[12];
+ uint16_t huff_code_dc_chrominance[12];
+
+ uint8_t huff_size_ac_luminance[256];
+ uint16_t huff_code_ac_luminance[256];
+ uint8_t huff_size_ac_chrominance[256];
+ uint16_t huff_code_ac_chrominance[256];
+} MJpegContext;
+
+/* JPEG marker codes */
+typedef enum {
+ /* start of frame */
+ SOF0 = 0xc0, /* baseline */
+ SOF1 = 0xc1, /* extended sequential, huffman */
+ SOF2 = 0xc2, /* progressive, huffman */
+ SOF3 = 0xc3, /* lossless, huffman */
+
+ SOF5 = 0xc5, /* differential sequential, huffman */
+ SOF6 = 0xc6, /* differential progressive, huffman */
+ SOF7 = 0xc7, /* differential lossless, huffman */
+ JPG = 0xc8, /* reserved for JPEG extension */
+ SOF9 = 0xc9, /* extended sequential, arithmetic */
+ SOF10 = 0xca, /* progressive, arithmetic */
+ SOF11 = 0xcb, /* lossless, arithmetic */
+
+ SOF13 = 0xcd, /* differential sequential, arithmetic */
+ SOF14 = 0xce, /* differential progressive, arithmetic */
+ SOF15 = 0xcf, /* differential lossless, arithmetic */
+
+ DHT = 0xc4, /* define huffman tables */
+
+ DAC = 0xcc, /* define arithmetic-coding conditioning */
+
+ /* restart with modulo 8 count "m" */
+ RST0 = 0xd0,
+ RST1 = 0xd1,
+ RST2 = 0xd2,
+ RST3 = 0xd3,
+ RST4 = 0xd4,
+ RST5 = 0xd5,
+ RST6 = 0xd6,
+ RST7 = 0xd7,
+
+ SOI = 0xd8, /* start of image */
+ EOI = 0xd9, /* end of image */
+ SOS = 0xda, /* start of scan */
+ DQT = 0xdb, /* define quantization tables */
+ DNL = 0xdc, /* define number of lines */
+ DRI = 0xdd, /* define restart interval */
+ DHP = 0xde, /* define hierarchical progression */
+ EXP = 0xdf, /* expand reference components */
+
+ APP0 = 0xe0,
+ APP1 = 0xe1,
+ APP2 = 0xe2,
+ APP3 = 0xe3,
+ APP4 = 0xe4,
+ APP5 = 0xe5,
+ APP6 = 0xe6,
+ APP7 = 0xe7,
+ APP8 = 0xe8,
+ APP9 = 0xe9,
+ APP10 = 0xea,
+ APP11 = 0xeb,
+ APP12 = 0xec,
+ APP13 = 0xed,
+ APP14 = 0xee,
+ APP15 = 0xef,
+
+ JPG0 = 0xf0,
+ JPG1 = 0xf1,
+ JPG2 = 0xf2,
+ JPG3 = 0xf3,
+ JPG4 = 0xf4,
+ JPG5 = 0xf5,
+ JPG6 = 0xf6,
+ JPG7 = 0xf7,
+ JPG8 = 0xf8,
+ JPG9 = 0xf9,
+ JPG10 = 0xfa,
+ JPG11 = 0xfb,
+ JPG12 = 0xfc,
+ JPG13 = 0xfd,
+
+ COM = 0xfe, /* comment */
+
+ TEM = 0x01, /* temporary private use for arithmetic coding */
+
+ /* 0x02 -> 0xbf reserved */
+} JPEG_MARKER;
+
+#if 0
+/* These are the sample quantization tables given in JPEG spec section K.1.
+ * The spec says that the values given produce "good" quality, and
+ * when divided by 2, "very good" quality.
+ */
+static const unsigned char std_luminance_quant_tbl[64] = {
+ 16, 11, 10, 16, 24, 40, 51, 61,
+ 12, 12, 14, 19, 26, 58, 60, 55,
+ 14, 13, 16, 24, 40, 57, 69, 56,
+ 14, 17, 22, 29, 51, 87, 80, 62,
+ 18, 22, 37, 56, 68, 109, 103, 77,
+ 24, 35, 55, 64, 81, 104, 113, 92,
+ 49, 64, 78, 87, 103, 121, 120, 101,
+ 72, 92, 95, 98, 112, 100, 103, 99
+};
+static const unsigned char std_chrominance_quant_tbl[64] = {
+ 17, 18, 24, 47, 99, 99, 99, 99,
+ 18, 21, 26, 66, 99, 99, 99, 99,
+ 24, 26, 56, 99, 99, 99, 99, 99,
+ 47, 66, 99, 99, 99, 99, 99, 99,
+ 99, 99, 99, 99, 99, 99, 99, 99,
+ 99, 99, 99, 99, 99, 99, 99, 99,
+ 99, 99, 99, 99, 99, 99, 99, 99,
+ 99, 99, 99, 99, 99, 99, 99, 99
+};
+#endif
+
+/* Set up the standard Huffman tables (cf. JPEG standard section K.3) */
+/* IMPORTANT: these are only valid for 8-bit data precision! */
+static const uint8_t bits_dc_luminance[17] =
+{ /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
+static const uint8_t val_dc_luminance[] =
+{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
+
+static const uint8_t bits_dc_chrominance[17] =
+{ /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
+static const uint8_t val_dc_chrominance[] =
+{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
+
+static const uint8_t bits_ac_luminance[17] =
+{ /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
+static const uint8_t val_ac_luminance[] =
+{ 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
+ 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
+ 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
+ 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
+ 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
+ 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
+ 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
+ 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
+ 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
+ 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
+ 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
+ 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
+ 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
+ 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
+ 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
+ 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
+ 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
+ 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
+ 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
+ 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
+ 0xf9, 0xfa
+};
+
+static const uint8_t bits_ac_chrominance[17] =
+{ /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
+
+static const uint8_t val_ac_chrominance[] =
+{ 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
+ 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
+ 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
+ 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
+ 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
+ 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
+ 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
+ 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
+ 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
+ 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
+ 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
+ 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+ 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
+ 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
+ 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
+ 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
+ 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
+ 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
+ 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
+ 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
+ 0xf9, 0xfa
+};
+
+/* isn't this function nicer than the one in the libjpeg ? */
+static void build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,
+ const uint8_t *bits_table, const uint8_t *val_table)
+{
+ int i, j, k,nb, code, sym;
+
+ code = 0;
+ k = 0;
+ for(i=1;i<=16;i++) {
+ nb = bits_table[i];
+ for(j=0;j<nb;j++) {
+ sym = val_table[k++];
+ huff_size[sym] = i;
+ huff_code[sym] = code;
+ code++;
+ }
+ code <<= 1;
+ }
+}
+
+int mjpeg_init(MpegEncContext *s)
+{
+ MJpegContext *m;
+
+ m = av_malloc(sizeof(MJpegContext));
+ if (!m)
+ return -1;
+
+ s->min_qcoeff=-1023;
+ s->max_qcoeff= 1023;
+
+ /* build all the huffman tables */
+ build_huffman_codes(m->huff_size_dc_luminance,
+ m->huff_code_dc_luminance,
+ bits_dc_luminance,
+ val_dc_luminance);
+ build_huffman_codes(m->huff_size_dc_chrominance,
+ m->huff_code_dc_chrominance,
+ bits_dc_chrominance,
+ val_dc_chrominance);
+ build_huffman_codes(m->huff_size_ac_luminance,
+ m->huff_code_ac_luminance,
+ bits_ac_luminance,
+ val_ac_luminance);
+ build_huffman_codes(m->huff_size_ac_chrominance,
+ m->huff_code_ac_chrominance,
+ bits_ac_chrominance,
+ val_ac_chrominance);
+
+ s->mjpeg_ctx = m;
+ return 0;
+}
+
+void mjpeg_close(MpegEncContext *s)
+{
+ av_free(s->mjpeg_ctx);
+}
+
+#define PREDICT(ret, topleft, top, left, predictor)\
+ switch(predictor){\
+ case 1: ret= left; break;\
+ case 2: ret= top; break;\
+ case 3: ret= topleft; break;\
+ case 4: ret= left + top - topleft; break;\
+ case 5: ret= left + ((top - topleft)>>1); break;\
+ case 6: ret= top + ((left - topleft)>>1); break;\
+ default:\
+ case 7: ret= (left + top)>>1; break;\
+ }
+
+#ifdef CONFIG_ENCODERS
+static inline void put_marker(PutBitContext *p, int code)
+{
+ put_bits(p, 8, 0xff);
+ put_bits(p, 8, code);
+}
+
+/* table_class: 0 = DC coef, 1 = AC coefs */
+static int put_huffman_table(MpegEncContext *s, int table_class, int table_id,
+ const uint8_t *bits_table, const uint8_t *value_table)
+{
+ PutBitContext *p = &s->pb;
+ 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(MpegEncContext *s)
+{
+ PutBitContext *p = &s->pb;
+ int i, j, size;
+ uint8_t *ptr;
+
+ /* quant matrixes */
+ put_marker(p, DQT);
+#ifdef TWOMATRIXES
+ put_bits(p, 16, 2 + 2 * (1 + 64));
+#else
+ put_bits(p, 16, 2 + 1 * (1 + 64));
+#endif
+ put_bits(p, 4, 0); /* 8 bit precision */
+ put_bits(p, 4, 0); /* table 0 */
+ for(i=0;i<64;i++) {
+ j = s->intra_scantable.permutated[i];
+ put_bits(p, 8, s->intra_matrix[j]);
+ }
+#ifdef TWOMATRIXES
+ put_bits(p, 4, 0); /* 8 bit precision */
+ put_bits(p, 4, 1); /* table 1 */
+ for(i=0;i<64;i++) {
+ j = s->intra_scantable.permutated[i];
+ put_bits(p, 8, s->chroma_intra_matrix[j]);
+ }
+#endif
+
+ /* huffman table */
+ put_marker(p, DHT);
+ flush_put_bits(p);
+ ptr = pbBufPtr(p);
+ put_bits(p, 16, 0); /* patched later */
+ size = 2;
+ size += put_huffman_table(s, 0, 0, bits_dc_luminance, val_dc_luminance);
+ size += put_huffman_table(s, 0, 1, bits_dc_chrominance, val_dc_chrominance);
+
+ size += put_huffman_table(s, 1, 0, bits_ac_luminance, val_ac_luminance);
+ size += put_huffman_table(s, 1, 1, bits_ac_chrominance, val_ac_chrominance);
+ ptr[0] = size >> 8;
+ ptr[1] = size;
+}
+
+static void jpeg_put_comments(MpegEncContext *s)
+{
+ PutBitContext *p = &s->pb;
+ int size;
+ uint8_t *ptr;
+
+ if (s->aspect_ratio_info /* && !lossless */)
+ {
+ /* JFIF header */
+ put_marker(p, APP0);
+ put_bits(p, 16, 16);
+ put_string(p, "JFIF"); /* 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 */
+ switch(s->aspect_ratio_info)
+ {
+ case FF_ASPECT_4_3_625:
+ case FF_ASPECT_4_3_525:
+ put_bits(p, 16, 4);
+ put_bits(p, 16, 3);
+ break;
+ case FF_ASPECT_16_9_625:
+ case FF_ASPECT_16_9_525:
+ put_bits(p, 16, 16);
+ put_bits(p, 16, 9);
+ break;
+ case FF_ASPECT_EXTENDED:
+ put_bits(p, 16, s->aspected_width);
+ put_bits(p, 16, s->aspected_height);
+ break;
+ case FF_ASPECT_SQUARE:
+ default:
+ put_bits(p, 16, 1); /* aspect: 1:1 */
+ put_bits(p, 16, 1);
+ break;
+ }
+ put_bits(p, 8, 0); /* thumbnail width */
+ put_bits(p, 8, 0); /* thumbnail height */
+ }
+
+ /* comment */
+ if(!(s->flags & CODEC_FLAG_BITEXACT)){
+ put_marker(p, COM);
+ flush_put_bits(p);
+ ptr = pbBufPtr(p);
+ put_bits(p, 16, 0); /* patched later */
+ put_string(p, LIBAVCODEC_IDENT);
+ size = strlen(LIBAVCODEC_IDENT)+3;
+ ptr[0] = size >> 8;
+ ptr[1] = size;
+ }
+}
+
+void mjpeg_picture_header(MpegEncContext *s)
+{
+ const int lossless= s->avctx->codec_id == CODEC_ID_LJPEG;
+
+ put_marker(&s->pb, SOI);
+
+ if (!s->mjpeg_data_only_frames)
+ {
+ jpeg_put_comments(s);
+
+ if (s->mjpeg_write_tables) jpeg_table_header(s);
+
+ put_marker(&s->pb, lossless ? SOF3 : SOF0);
+
+ put_bits(&s->pb, 16, 17);
+ if(lossless && s->avctx->pix_fmt == PIX_FMT_RGBA32)
+ put_bits(&s->pb, 8, 9); /* 9 bits/component RCT */
+ else
+ put_bits(&s->pb, 8, 8); /* 8 bits/component */
+ put_bits(&s->pb, 16, s->height);
+ put_bits(&s->pb, 16, s->width);
+ put_bits(&s->pb, 8, 3); /* 3 components */
+
+ /* Y component */
+ put_bits(&s->pb, 8, 1); /* component number */
+ put_bits(&s->pb, 4, s->mjpeg_hsample[0]); /* H factor */
+ put_bits(&s->pb, 4, s->mjpeg_vsample[0]); /* V factor */
+ put_bits(&s->pb, 8, 0); /* select matrix */
+
+ /* Cb component */
+ put_bits(&s->pb, 8, 2); /* component number */
+ put_bits(&s->pb, 4, s->mjpeg_hsample[1]); /* H factor */
+ put_bits(&s->pb, 4, s->mjpeg_vsample[1]); /* V factor */
+#ifdef TWOMATRIXES
+ put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
+#else
+ put_bits(&s->pb, 8, 0); /* select matrix */
+#endif
+
+ /* Cr component */
+ put_bits(&s->pb, 8, 3); /* component number */
+ put_bits(&s->pb, 4, s->mjpeg_hsample[2]); /* H factor */
+ put_bits(&s->pb, 4, s->mjpeg_vsample[2]); /* V factor */
+#ifdef TWOMATRIXES
+ put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
+#else
+ put_bits(&s->pb, 8, 0); /* select matrix */
+#endif
+ }
+
+ /* scan header */
+ put_marker(&s->pb, SOS);
+ put_bits(&s->pb, 16, 12); /* length */
+ put_bits(&s->pb, 8, 3); /* 3 components */
+
+ /* Y component */
+ put_bits(&s->pb, 8, 1); /* index */
+ put_bits(&s->pb, 4, 0); /* DC huffman table index */
+ put_bits(&s->pb, 4, 0); /* AC huffman table index */
+
+ /* Cb component */
+ put_bits(&s->pb, 8, 2); /* index */
+ put_bits(&s->pb, 4, 1); /* DC huffman table index */
+ put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
+
+ /* Cr component */
+ put_bits(&s->pb, 8, 3); /* index */
+ put_bits(&s->pb, 4, 1); /* DC huffman table index */
+ put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
+
+ put_bits(&s->pb, 8, lossless ? s->avctx->prediction_method+1 : 0); /* Ss (not used) */
+ put_bits(&s->pb, 8, lossless ? 0 : 63); /* Se (not used) */
+ put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */
+}
+
+static void escape_FF(MpegEncContext *s, int start)
+{
+ int size= get_bit_count(&s->pb) - start*8;
+ int i, ff_count;
+ uint8_t *buf= s->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;
+
+ /* skip put bits */
+ for(i=0; i<ff_count-3; i+=4)
+ put_bits(&s->pb, 32, 0);
+ put_bits(&s->pb, (ff_count-i)*8, 0);
+ flush_put_bits(&s->pb);
+
+ for(i=size-1; ff_count; i--){
+ int v= buf[i];
+
+ if(v==0xFF){
+//printf("%d %d\n", i, ff_count);
+ buf[i+ff_count]= 0;
+ ff_count--;
+ }
+
+ buf[i+ff_count]= v;
+ }
+}
+
+void mjpeg_picture_trailer(MpegEncContext *s)
+{
+ int pad= (-get_bit_count(&s->pb))&7;
+
+ put_bits(&s->pb, pad,0xFF>>(8-pad));
+ flush_put_bits(&s->pb);
+
+ assert((s->header_bits&7)==0);
+
+ escape_FF(s, s->header_bits>>3);
+
+ put_marker(&s->pb, EOI);
+}
+
+static inline void mjpeg_encode_dc(MpegEncContext *s, int val,
+ uint8_t *huff_size, uint16_t *huff_code)
+{
+ int mant, nbits;
+
+ if (val == 0) {
+ put_bits(&s->pb, huff_size[0], huff_code[0]);
+ } else {
+ mant = val;
+ if (val < 0) {
+ val = -val;
+ mant--;
+ }
+
+ nbits= av_log2_16bit(val) + 1;
+
+ put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
+
+ put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));
+ }
+}
+
+static void encode_block(MpegEncContext *s, DCTELEM *block, int n)
+{
+ int mant, nbits, code, i, j;
+ int component, dc, run, last_index, val;
+ MJpegContext *m = s->mjpeg_ctx;
+ uint8_t *huff_size_ac;
+ uint16_t *huff_code_ac;
+
+ /* DC coef */
+ component = (n <= 3 ? 0 : n - 4 + 1);
+ dc = block[0]; /* overflow is impossible */
+ val = dc - s->last_dc[component];
+ if (n < 4) {
+ mjpeg_encode_dc(s, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
+ huff_size_ac = m->huff_size_ac_luminance;
+ huff_code_ac = m->huff_code_ac_luminance;
+ } else {
+ mjpeg_encode_dc(s, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
+ huff_size_ac = m->huff_size_ac_chrominance;
+ huff_code_ac = m->huff_code_ac_chrominance;
+ }
+ s->last_dc[component] = dc;
+
+ /* AC coefs */
+
+ run = 0;
+ last_index = s->block_last_index[n];
+ for(i=1;i<=last_index;i++) {
+ j = s->intra_scantable.permutated[i];
+ val = block[j];
+ if (val == 0) {
+ run++;
+ } else {
+ while (run >= 16) {
+ put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
+ run -= 16;
+ }
+ mant = val;
+ if (val < 0) {
+ val = -val;
+ mant--;
+ }
+
+ nbits= av_log2(val) + 1;
+ code = (run << 4) | nbits;
+
+ put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
+
+ put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));
+ run = 0;
+ }
+ }
+
+ /* output EOB only if not already 64 values */
+ if (last_index < 63 || run != 0)
+ put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
+}
+
+void mjpeg_encode_mb(MpegEncContext *s,
+ DCTELEM block[6][64])
+{
+ int i;
+ for(i=0;i<6;i++) {
+ encode_block(s, block[i], i);
+ }
+}
+
+static int encode_picture_lossless(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
+ MpegEncContext * const s = avctx->priv_data;
+ MJpegContext * const m = s->mjpeg_ctx;
+ AVFrame *pict = data;
+ const int width= s->width;
+ const int height= s->height;
+ AVFrame * const p= (AVFrame*)&s->current_picture;
+ const int predictor= avctx->prediction_method+1;
+
+ init_put_bits(&s->pb, buf, buf_size, NULL, NULL);
+
+ *p = *pict;
+ p->pict_type= FF_I_TYPE;
+ p->key_frame= 1;
+
+ mjpeg_picture_header(s);
+
+ s->header_bits= get_bit_count(&s->pb);
+
+ if(avctx->pix_fmt == PIX_FMT_RGBA32){
+ int x, y, i;
+ const int linesize= p->linesize[0];
+ uint16_t buffer[2048][4];
+ int left[3], top[3], topleft[3];
+
+ for(i=0; i<3; i++){
+ buffer[0][i]= 1 << (9 - 1);
+ }
+
+ for(y = 0; y < height; y++) {
+ const int modified_predictor= y ? predictor : 1;
+ uint8_t *ptr = p->data[0] + (linesize * y);
+
+ for(i=0; i<3; i++){
+ top[i]= left[i]= topleft[i]= buffer[0][i];
+ }
+ for(x = 0; x < width; x++) {
+ buffer[x][1] = ptr[4*x+0] - ptr[4*x+1] + 0x100;
+ buffer[x][2] = ptr[4*x+2] - ptr[4*x+1] + 0x100;
+ buffer[x][0] = (ptr[4*x+0] + 2*ptr[4*x+1] + ptr[4*x+2])>>2;
+
+ for(i=0;i<3;i++) {
+ int pred, diff;
+
+ PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
+
+ topleft[i]= top[i];
+ top[i]= buffer[x+1][i];
+
+ left[i]= buffer[x][i];
+
+ diff= ((left[i] - pred + 0x100)&0x1FF) - 0x100;
+
+ if(i==0)
+ mjpeg_encode_dc(s, diff, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
+ else
+ mjpeg_encode_dc(s, diff, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
+ }
+ }
+ }
+ }else{
+ int mb_x, mb_y, i;
+ const int mb_width = (width + s->mjpeg_hsample[0] - 1) / s->mjpeg_hsample[0];
+ const int mb_height = (height + s->mjpeg_vsample[0] - 1) / s->mjpeg_vsample[0];
+
+ for(mb_y = 0; mb_y < mb_height; mb_y++) {
+ for(mb_x = 0; mb_x < mb_width; mb_x++) {
+ if(mb_x==0 || mb_y==0){
+ for(i=0;i<3;i++) {
+ uint8_t *ptr;
+ int x, y, h, v, linesize;
+ h = s->mjpeg_hsample[i];
+ v = s->mjpeg_vsample[i];
+ linesize= p->linesize[i];
+
+ for(y=0; y<v; y++){
+ for(x=0; x<h; x++){
+ int pred;
+
+ ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
+ if(y==0 && mb_y==0){
+ if(x==0 && mb_x==0){
+ pred= 128;
+ }else{
+ pred= ptr[-1];
+ }
+ }else{
+ if(x==0 && mb_x==0){
+ pred= ptr[-linesize];
+ }else{
+ PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
+ }
+ }
+
+ if(i==0)
+ mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
+ else
+ mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
+ }
+ }
+ }
+ }else{
+ for(i=0;i<3;i++) {
+ uint8_t *ptr;
+ int x, y, h, v, linesize;
+ h = s->mjpeg_hsample[i];
+ v = s->mjpeg_vsample[i];
+ linesize= p->linesize[i];
+
+ for(y=0; y<v; y++){
+ for(x=0; x<h; x++){
+ int pred;
+
+ ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
+//printf("%d %d %d %d %8X\n", mb_x, mb_y, x, y, ptr);
+ PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
+
+ if(i==0)
+ mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
+ else
+ mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+
+ emms_c();
+
+ mjpeg_picture_trailer(s);
+ s->picture_number++;
+
+ flush_put_bits(&s->pb);
+ return pbBufPtr(&s->pb) - s->pb.buf;
+// return (get_bit_count(&f->pb)+7)/8;
+}
+
+#endif //CONFIG_ENCODERS
+
+/******************************************/
+/* decoding */
+
+#define MAX_COMPONENTS 4
+
+typedef struct MJpegDecodeContext {
+ AVCodecContext *avctx;
+ GetBitContext gb;
+ int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
+
+ int start_code; /* current start code */
+ int buffer_size;
+ uint8_t *buffer;
+
+ int16_t quant_matrixes[4][64];
+ VLC vlcs[2][4];
+ int qscale[4]; ///< quantizer scale calculated from quant_matrixes
+
+ int org_width, org_height; /* size given at codec init */
+ int first_picture; /* true if decoding first picture */
+ int interlaced; /* true if interlaced */
+ int bottom_field; /* true if bottom field */
+ int lossless;
+ int rgb;
+ int rct; /* standard rct */
+ int pegasus_rct; /* pegasus reversible colorspace transform */
+ int bits; /* bits per component */
+
+ int width, height;
+ int mb_width, mb_height;
+ int nb_components;
+ int component_id[MAX_COMPONENTS];
+ int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
+ int v_count[MAX_COMPONENTS];
+ int comp_index[MAX_COMPONENTS];
+ int dc_index[MAX_COMPONENTS];
+ int ac_index[MAX_COMPONENTS];
+ int nb_blocks[MAX_COMPONENTS];
+ int h_scount[MAX_COMPONENTS];
+ int v_scount[MAX_COMPONENTS];
+ int h_max, v_max; /* maximum h and v counts */
+ int quant_index[4]; /* quant table index for each component */
+ int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
+ uint8_t *current_picture[MAX_COMPONENTS]; /* picture structure */
+ int linesize[MAX_COMPONENTS];
+ uint8_t *qscale_table;
+ DCTELEM block[64] __align8;
+ ScanTable scantable;
+ void (*idct_put)(uint8_t *dest/*align 8*/, int line_size, DCTELEM *block/*align 16*/);
+
+ int restart_interval;
+ int restart_count;
+
+ int buggy_avid;
+ int interlace_polarity;
+} MJpegDecodeContext;
+
+static int mjpeg_decode_dht(MJpegDecodeContext *s);
+
+static int build_vlc(VLC *vlc, const uint8_t *bits_table, const uint8_t *val_table,
+ int nb_codes)
+{
+ uint8_t huff_size[256];
+ uint16_t huff_code[256];
+
+ memset(huff_size, 0, sizeof(huff_size));
+ build_huffman_codes(huff_size, huff_code, bits_table, val_table);
+
+ return init_vlc(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2);
+}
+
+static int mjpeg_decode_init(AVCodecContext *avctx)
+{
+ MJpegDecodeContext *s = avctx->priv_data;
+ MpegEncContext s2;
+
+ s->avctx = avctx;
+
+ /* ugly way to get the idct & scantable FIXME */
+ memset(&s2, 0, sizeof(MpegEncContext));
+ s2.flags= avctx->flags;
+ s2.avctx= avctx;
+// s2->out_format = FMT_MJPEG;
+ s2.width = 8;
+ s2.height = 8;
+ if (MPV_common_init(&s2) < 0)
+ return -1;
+ s->scantable= s2.intra_scantable;
+ s->idct_put= s2.dsp.idct_put;
+ MPV_common_end(&s2);
+
+ s->mpeg_enc_ctx_allocated = 0;
+ s->buffer_size = 102400; /* smaller buffer should be enough,
+ but photojpg files could ahive bigger sizes */
+ s->buffer = av_malloc(s->buffer_size);
+ if (!s->buffer)
+ return -1;
+ s->start_code = -1;
+ s->first_picture = 1;
+ s->org_width = avctx->width;
+ s->org_height = avctx->height;
+
+ build_vlc(&s->vlcs[0][0], bits_dc_luminance, val_dc_luminance, 12);
+ build_vlc(&s->vlcs[0][1], bits_dc_chrominance, val_dc_chrominance, 12);
+ build_vlc(&s->vlcs[1][0], bits_ac_luminance, val_ac_luminance, 251);
+ build_vlc(&s->vlcs[1][1], bits_ac_chrominance, val_ac_chrominance, 251);
+
+ if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)
+ {
+ printf("mjpeg: using external huffman table\n");
+ init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8);
+ mjpeg_decode_dht(s);
+ /* should check for error - but dunno */
+ }
+
+ return 0;
+}
+
+/* quantize tables */
+static int mjpeg_decode_dqt(MJpegDecodeContext *s)
+{
+ int len, index, i, j;
+
+ len = get_bits(&s->gb, 16) - 2;
+
+ while (len >= 65) {
+ /* only 8 bit precision handled */
+ if (get_bits(&s->gb, 4) != 0)
+ {
+ dprintf("dqt: 16bit precision\n");
+ return -1;
+ }
+ index = get_bits(&s->gb, 4);
+ if (index >= 4)
+ return -1;
+ dprintf("index=%d\n", index);
+ /* read quant table */
+ for(i=0;i<64;i++) {
+ j = s->scantable.permutated[i];
+ s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
+ }
+
+ //XXX FIXME finetune, and perhaps add dc too
+ s->qscale[index]= FFMAX(
+ s->quant_matrixes[index][s->scantable.permutated[1]],
+ s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
+ len -= 65;
+ }
+
+ return 0;
+}
+
+/* decode huffman tables and build VLC decoders */
+static int mjpeg_decode_dht(MJpegDecodeContext *s)
+{
+ int len, index, i, class, n, v, code_max;
+ uint8_t bits_table[17];
+ uint8_t val_table[256];
+
+ len = get_bits(&s->gb, 16) - 2;
+
+ while (len > 0) {
+ if (len < 17)
+ return -1;
+ class = get_bits(&s->gb, 4);
+ if (class >= 2)
+ return -1;
+ index = get_bits(&s->gb, 4);
+ if (index >= 4)
+ return -1;
+ n = 0;
+ for(i=1;i<=16;i++) {
+ bits_table[i] = get_bits(&s->gb, 8);
+ n += bits_table[i];
+ }
+ len -= 17;
+ if (len < n || n > 256)
+ return -1;
+
+ code_max = 0;
+ for(i=0;i<n;i++) {
+ v = get_bits(&s->gb, 8);
+ if (v > code_max)
+ code_max = v;
+ val_table[i] = v;
+ }
+ len -= n;
+
+ /* build VLC and flush previous vlc if present */
+ free_vlc(&s->vlcs[class][index]);
+ dprintf("class=%d index=%d nb_codes=%d\n",
+ class, index, code_max + 1);
+ if(build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1) < 0){
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static int mjpeg_decode_sof(MJpegDecodeContext *s)
+{
+ int len, nb_components, i, width, height;
+
+ /* XXX: verify len field validity */
+ len = get_bits(&s->gb, 16);
+ s->bits= get_bits(&s->gb, 8);
+
+ if(s->pegasus_rct) s->bits=9;
+ if(s->bits==9 && !s->pegasus_rct) s->rct=1; //FIXME ugly
+
+ if (s->bits != 8 && !s->lossless){
+ printf("only 8 bits/component accepted\n");
+ return -1;
+ }
+ height = get_bits(&s->gb, 16);
+ width = get_bits(&s->gb, 16);
+ dprintf("sof0: picture: %dx%d\n", width, height);
+
+ nb_components = get_bits(&s->gb, 8);
+ if (nb_components <= 0 ||
+ nb_components > MAX_COMPONENTS)
+ return -1;
+ s->nb_components = nb_components;
+ s->h_max = 1;
+ s->v_max = 1;
+ for(i=0;i<nb_components;i++) {
+ /* component id */
+ s->component_id[i] = get_bits(&s->gb, 8) - 1;
+ s->h_count[i] = get_bits(&s->gb, 4);
+ s->v_count[i] = get_bits(&s->gb, 4);
+ /* compute hmax and vmax (only used in interleaved case) */
+ if (s->h_count[i] > s->h_max)
+ s->h_max = s->h_count[i];
+ if (s->v_count[i] > s->v_max)
+ s->v_max = s->v_count[i];
+ s->quant_index[i] = get_bits(&s->gb, 8);
+ if (s->quant_index[i] >= 4)
+ return -1;
+ dprintf("component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],
+ s->v_count[i], s->component_id[i], s->quant_index[i]);
+ }
+
+ if(s->v_max==1 && s->h_max==1 && s->lossless==1) s->rgb=1;
+
+ /* if different size, realloc/alloc picture */
+ /* XXX: also check h_count and v_count */
+ if (width != s->width || height != s->height) {
+ for(i=0;i<MAX_COMPONENTS;i++)
+ av_freep(&s->current_picture[i]);
+
+ av_freep(&s->qscale_table);
+
+ s->width = width;
+ s->height = height;
+ /* test interlaced mode */
+ if (s->first_picture &&
+ s->org_height != 0 &&
+ s->height < ((s->org_height * 3) / 4)) {
+ s->interlaced = 1;
+// s->bottom_field = (s->interlace_polarity) ? 1 : 0;
+ s->bottom_field = 0;
+ }
+
+ if(s->rgb){
+ int w, h;
+ w = s->width;
+ h = s->height;
+ if (s->interlaced)
+ w *= 2;
+ s->linesize[0] = 4*w;
+ s->current_picture[0] = av_mallocz(4*w * h);
+ s->current_picture[1] = s->current_picture[2] = NULL;
+ }else{
+ for(i=0;i<nb_components;i++) {
+ int w, h;
+ w = (s->width + 8 * s->h_max - 1) / (8 * s->h_max);
+ h = (s->height + 8 * s->v_max - 1) / (8 * s->v_max);
+ w = w * 8 * s->h_count[i];
+ h = h * 8 * s->v_count[i];
+ if (s->interlaced)
+ w *= 2;
+ s->linesize[i] = w;
+ s->current_picture[i] = av_mallocz(w * h);
+ if (!s->current_picture[i])
+ {
+ dprintf("error: no picture buffers allocated\n");
+ return -1;
+ }
+ }
+ }
+ s->qscale_table= av_mallocz((s->width+15)/16);
+
+ s->first_picture = 0;
+ }
+
+ if (len != (8+(3*nb_components)))
+ {
+ dprintf("decode_sof0: error, len(%d) mismatch\n", len);
+ }
+
+ return 0;
+}
+
+static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
+{
+ int code;
+ code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
+ if (code < 0)
+ {
+ dprintf("mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,
+ &s->vlcs[0][dc_index]);
+ return 0xffff;
+ }
+
+ if(code)
+ return get_xbits(&s->gb, code);
+ else
+ return 0;
+}
+
+/* decode block and dequantize */
+static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
+ int component, int dc_index, int ac_index, int quant_index)
+{
+ int code, i, j, level, val;
+ VLC *ac_vlc;
+ int16_t *quant_matrix;
+
+ /* DC coef */
+ val = mjpeg_decode_dc(s, dc_index);
+ if (val == 0xffff) {
+ dprintf("error dc\n");
+ return -1;
+ }
+ quant_matrix = s->quant_matrixes[quant_index];
+ val = val * quant_matrix[0] + s->last_dc[component];
+ s->last_dc[component] = val;
+ block[0] = val;
+ /* AC coefs */
+ ac_vlc = &s->vlcs[1][ac_index];
+ i = 1;
+ for(;;) {
+ code = get_vlc2(&s->gb, s->vlcs[1][ac_index].table, 9, 2);
+
+ if (code < 0) {
+ dprintf("error ac\n");
+ return -1;
+ }
+ /* EOB */
+ if (code == 0)
+ break;
+ if (code == 0xf0) {
+ i += 16;
+ } else {
+ level = get_xbits(&s->gb, code & 0xf);
+ i += code >> 4;
+ if (i >= 64) {
+ dprintf("error count: %d\n", i);
+ return -1;
+ }
+ j = s->scantable.permutated[i];
+ block[j] = level * quant_matrix[j];
+ i++;
+ if (i >= 64)
+ break;
+ }
+ }
+ return 0;
+}
+
+static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){
+ int i, mb_x, mb_y;
+ uint16_t buffer[2048][4];
+ int left[3], top[3], topleft[3];
+ const int linesize= s->linesize[0];
+ const int mask= (1<<s->bits)-1;
+
+ for(i=0; i<3; i++){
+ buffer[0][i]= 1 << (s->bits + point_transform - 1);
+ }
+ for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
+ const int modified_predictor= mb_y ? predictor : 1;
+ uint8_t *ptr = s->current_picture[0] + (linesize * mb_y);
+
+ if (s->interlaced && s->bottom_field)
+ ptr += linesize >> 1;
+
+ for(i=0; i<3; i++){
+ top[i]= left[i]= topleft[i]= buffer[0][i];
+ }
+ for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
+ if (s->restart_interval && !s->restart_count)
+ s->restart_count = s->restart_interval;
+
+ for(i=0;i<3;i++) {
+ int pred;
+
+ topleft[i]= top[i];
+ top[i]= buffer[mb_x][i];
+
+ PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
+
+ left[i]=
+ buffer[mb_x][i]= mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
+ }
+
+ if (s->restart_interval && !--s->restart_count) {
+ align_get_bits(&s->gb);
+ skip_bits(&s->gb, 16); /* skip RSTn */
+ }
+ }
+
+ if(s->rct){
+ for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
+ ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200)>>2);
+ ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
+ ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
+ }
+ }else if(s->pegasus_rct){
+ for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
+ ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2);
+ ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
+ ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
+ }
+ }else{
+ for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
+ ptr[4*mb_x+0] = buffer[mb_x][0];
+ ptr[4*mb_x+1] = buffer[mb_x][1];
+ ptr[4*mb_x+2] = buffer[mb_x][2];
+ }
+ }
+ }
+ return 0;
+}
+
+static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point_transform){
+ int i, mb_x, mb_y;
+ const int nb_components=3;
+
+ for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
+ for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
+ if (s->restart_interval && !s->restart_count)
+ s->restart_count = s->restart_interval;
+
+ if(mb_x==0 || mb_y==0 || s->interlaced){
+ for(i=0;i<nb_components;i++) {
+ uint8_t *ptr;
+ int n, h, v, x, y, c, j, linesize;
+ n = s->nb_blocks[i];
+ c = s->comp_index[i];
+ h = s->h_scount[i];
+ v = s->v_scount[i];
+ x = 0;
+ y = 0;
+ linesize= s->linesize[c];
+
+ for(j=0; j<n; j++) {
+ int pred;
+
+ ptr = s->current_picture[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
+ if(y==0 && mb_y==0){
+ if(x==0 && mb_x==0){
+ pred= 128 << point_transform;
+ }else{
+ pred= ptr[-1];
+ }
+ }else{
+ if(x==0 && mb_x==0){
+ pred= ptr[-linesize];
+ }else{
+ PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
+ }
+ }
+
+ if (s->interlaced && s->bottom_field)
+ ptr += linesize >> 1;
+ *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
+
+ if (++x == h) {
+ x = 0;
+ y++;
+ }
+ }
+ }
+ }else{
+ for(i=0;i<nb_components;i++) {
+ uint8_t *ptr;
+ int n, h, v, x, y, c, j, linesize;
+ n = s->nb_blocks[i];
+ c = s->comp_index[i];
+ h = s->h_scount[i];
+ v = s->v_scount[i];
+ x = 0;
+ y = 0;
+ linesize= s->linesize[c];
+
+ for(j=0; j<n; j++) {
+ int pred;
+
+ ptr = s->current_picture[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
+ PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
+ *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
+ if (++x == h) {
+ x = 0;
+ y++;
+ }
+ }
+ }
+ }
+ if (s->restart_interval && !--s->restart_count) {
+ align_get_bits(&s->gb);
+ skip_bits(&s->gb, 16); /* skip RSTn */
+ }
+ }
+ }
+ return 0;
+}
+
+static int mjpeg_decode_scan(MJpegDecodeContext *s){
+ int i, mb_x, mb_y;
+ const int nb_components=3;
+
+ for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
+ for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
+ if (s->restart_interval && !s->restart_count)
+ s->restart_count = s->restart_interval;
+
+ for(i=0;i<nb_components;i++) {
+ uint8_t *ptr;
+ int n, h, v, x, y, c, j;
+ n = s->nb_blocks[i];
+ c = s->comp_index[i];
+ h = s->h_scount[i];
+ v = s->v_scount[i];
+ x = 0;
+ y = 0;
+ for(j=0;j<n;j++) {
+ memset(s->block, 0, sizeof(s->block));
+ if (decode_block(s, s->block, i,
+ s->dc_index[i], s->ac_index[i],
+ s->quant_index[c]) < 0) {
+ dprintf("error y=%d x=%d\n", mb_y, mb_x);
+ return -1;
+ }
+// dprintf("mb: %d %d processed\n", mb_y, mb_x);
+ ptr = s->current_picture[c] +
+ (s->linesize[c] * (v * mb_y + y) * 8) +
+ (h * mb_x + x) * 8;
+ if (s->interlaced && s->bottom_field)
+ ptr += s->linesize[c] >> 1;
+ s->idct_put(ptr, s->linesize[c], s->block);
+ if (++x == h) {
+ x = 0;
+ y++;
+ }
+ }
+ }
+ /* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */
+ if (s->restart_interval && (s->restart_interval < 1350) &&
+ !--s->restart_count) {
+ align_get_bits(&s->gb);
+ skip_bits(&s->gb, 16); /* skip RSTn */
+ for (i=0; i<nb_components; i++) /* reset dc */
+ s->last_dc[i] = 1024;
+ }
+ }
+ }
+ return 0;
+}
+
+static int mjpeg_decode_sos(MJpegDecodeContext *s)
+{
+ int len, nb_components, i, h, v, predictor, point_transform;
+ int vmax, hmax, index, id;
+ const int block_size= s->lossless ? 1 : 8;
+
+ /* XXX: verify len field validity */
+ len = get_bits(&s->gb, 16);
+ nb_components = get_bits(&s->gb, 8);
+ if (len != 6+2*nb_components)
+ {
+ dprintf("decode_sos: invalid len (%d)\n", len);
+ return -1;
+ }
+ /* XXX: only interleaved scan accepted */
+ if (nb_components != 3)
+ {
+ dprintf("decode_sos: components(%d) mismatch\n", nb_components);
+ return -1;
+ }
+ vmax = 0;
+ hmax = 0;
+ for(i=0;i<nb_components;i++) {
+ id = get_bits(&s->gb, 8) - 1;
+ dprintf("component: %d\n", id);
+ /* find component index */
+ for(index=0;index<s->nb_components;index++)
+ if (id == s->component_id[index])
+ break;
+ if (index == s->nb_components)
+ {
+ dprintf("decode_sos: index(%d) out of components\n", index);
+ return -1;
+ }
+
+ s->comp_index[i] = index;
+
+ s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
+ s->h_scount[i] = s->h_count[index];
+ s->v_scount[i] = s->v_count[index];
+
+ s->dc_index[i] = get_bits(&s->gb, 4);
+ s->ac_index[i] = get_bits(&s->gb, 4);
+
+ if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
+ s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
+ goto out_of_range;
+#if 0 //buggy
+ switch(s->start_code)
+ {
+ case SOF0:
+ if (dc_index[i] > 1 || ac_index[i] > 1)
+ goto out_of_range;
+ break;
+ case SOF1:
+ case SOF2:
+ if (dc_index[i] > 3 || ac_index[i] > 3)
+ goto out_of_range;
+ break;
+ case SOF3:
+ if (dc_index[i] > 3 || ac_index[i] != 0)
+ goto out_of_range;
+ break;
+ }
+#endif
+ }
+
+ predictor= get_bits(&s->gb, 8); /* lossless predictor or start of spectral (Ss) */
+ skip_bits(&s->gb, 8); /* Se */
+ skip_bits(&s->gb, 4); /* Ah */
+ point_transform= get_bits(&s->gb, 4); /* Al */
+
+ for(i=0;i<nb_components;i++)
+ s->last_dc[i] = 1024;
+
+ if (nb_components > 1) {
+ /* interleaved stream */
+ s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
+ s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
+ } else {
+ h = s->h_max / s->h_scount[s->comp_index[0]];
+ v = s->v_max / s->v_scount[s->comp_index[0]];
+ s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
+ s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
+ s->nb_blocks[0] = 1;
+ s->h_scount[0] = 1;
+ s->v_scount[0] = 1;
+ }
+
+ if(s->avctx->debug & FF_DEBUG_PICT_INFO)
+ printf("%s %s p:%d >>:%d\n", s->lossless ? "lossless" : "sequencial DCT", s->rgb ? "RGB" : "", predictor, point_transform);
+
+ if(s->lossless){
+ if(s->rgb){
+ if(ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)
+ return -1;
+ }else{
+ if(ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
+ return -1;
+ }
+ }else{
+ if(mjpeg_decode_scan(s) < 0)
+ return -1;
+ }
+ emms_c();
+ return 0;
+ out_of_range:
+ dprintf("decode_sos: ac/dc index out of range\n");
+ return -1;
+}
+
+static int mjpeg_decode_dri(MJpegDecodeContext *s)
+{
+ if (get_bits(&s->gb, 16) != 4)
+ return -1;
+ s->restart_interval = get_bits(&s->gb, 16);
+ dprintf("restart interval: %d\n", s->restart_interval);
+
+ return 0;
+}
+
+static int mjpeg_decode_app(MJpegDecodeContext *s)
+{
+ int len, id;
+
+ /* XXX: verify len field validity */
+ len = get_bits(&s->gb, 16);
+ if (len < 5)
+ return -1;
+
+ id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
+ id = be2me_32(id);
+ len -= 6;
+
+ if(s->avctx->debug & FF_DEBUG_STARTCODE){
+ printf("APPx %8X\n", id);
+ }
+
+ /* buggy AVID, it puts EOI only at every 10th frame */
+ /* also this fourcc is used by non-avid files too, it holds some
+ informations, but it's always present in AVID creates files */
+ if (id == ff_get_fourcc("AVI1"))
+ {
+ /* structure:
+ 4bytes AVI1
+ 1bytes polarity
+ 1bytes always zero
+ 4bytes field_size
+ 4bytes field_size_less_padding
+ */
+ s->buggy_avid = 1;
+// if (s->first_picture)
+// printf("mjpeg: workarounding buggy AVID\n");
+ s->interlace_polarity = get_bits(&s->gb, 8);
+#if 0
+ skip_bits(&s->gb, 8);
+ skip_bits(&s->gb, 32);
+ skip_bits(&s->gb, 32);
+ len -= 10;
+#endif
+// if (s->interlace_polarity)
+// printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
+ goto out;
+ }
+
+// len -= 2;
+
+ if (id == ff_get_fourcc("JFIF"))
+ {
+ int t_w, t_h;
+ skip_bits(&s->gb, 8); /* the trailing zero-byte */
+ printf("mjpeg: JFIF header found (version: %x.%x)\n",
+ get_bits(&s->gb, 8), get_bits(&s->gb, 8));
+ if (get_bits(&s->gb, 8) == 0)
+ {
+ int x_density, y_density;
+ x_density = get_bits(&s->gb, 16);
+ y_density = get_bits(&s->gb, 16);
+
+ dprintf("x/y density: %d (%f), %d (%f)\n", x_density,
+ (float)x_density, y_density, (float)y_density);
+#if 0
+ //MN: needs to be checked
+ if(x_density)
+// s->avctx->aspect_ratio= s->width*y_density/((float)s->height*x_density);
+ s->avctx->aspect_ratio = (float)x_density/y_density;
+ /* it's better, but every JFIF I have seen stores 1:1 */
+ else
+ s->avctx->aspect_ratio= 0.0;
+#endif
+ }
+ else
+ {
+ skip_bits(&s->gb, 16);
+ skip_bits(&s->gb, 16);
+ }
+
+ t_w = get_bits(&s->gb, 8);
+ t_h = get_bits(&s->gb, 8);
+ if (t_w && t_h)
+ {
+ /* skip thumbnail */
+ if (len-10-(t_w*t_h*3) > 0)
+ len -= t_w*t_h*3;
+ }
+ len -= 10;
+ goto out;
+ }
+
+ if (id == ff_get_fourcc("Adob") && (get_bits(&s->gb, 8) == 'e'))
+ {
+ printf("mjpeg: Adobe header found\n");
+ skip_bits(&s->gb, 16); /* version */
+ skip_bits(&s->gb, 16); /* flags0 */
+ skip_bits(&s->gb, 16); /* flags1 */
+ skip_bits(&s->gb, 8); /* transform */
+ len -= 7;
+ goto out;
+ }
+
+ if (id == ff_get_fourcc("LJIF")){
+ printf("Pegasus lossless jpeg header found\n");
+ skip_bits(&s->gb, 16); /* version ? */
+ skip_bits(&s->gb, 16); /* unknwon always 0? */
+ skip_bits(&s->gb, 16); /* unknwon always 0? */
+ skip_bits(&s->gb, 16); /* unknwon always 0? */
+ switch( get_bits(&s->gb, 8)){
+ case 1:
+ s->rgb= 1;
+ s->pegasus_rct=0;
+ break;
+ case 2:
+ s->rgb= 1;
+ s->pegasus_rct=1;
+ break;
+ default:
+ printf("unknown colorspace\n");
+ }
+ len -= 9;
+ goto out;
+ }
+
+ /* Apple MJPEG-A */
+ if ((s->start_code == APP1) && (len > (0x28 - 8)))
+ {
+ id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
+ id = be2me_32(id);
+ len -= 4;
+ if (id == ff_get_fourcc("mjpg")) /* Apple MJPEG-A */
+ {
+#if 0
+ skip_bits(&s->gb, 32); /* field size */
+ skip_bits(&s->gb, 32); /* pad field size */
+ skip_bits(&s->gb, 32); /* next off */
+ skip_bits(&s->gb, 32); /* quant off */
+ skip_bits(&s->gb, 32); /* huff off */
+ skip_bits(&s->gb, 32); /* image off */
+ skip_bits(&s->gb, 32); /* scan off */
+ skip_bits(&s->gb, 32); /* data off */
+#endif
+ if (s->first_picture)
+ printf("mjpeg: Apple MJPEG-A header found\n");
+ }
+ }
+
+out:
+ /* slow but needed for extreme adobe jpegs */
+ if (len < 0)
+ printf("mjpeg: error, decode_app parser read over the end\n");
+ while(--len > 0)
+ skip_bits(&s->gb, 8);
+
+ return 0;
+}
+
+static int mjpeg_decode_com(MJpegDecodeContext *s)
+{
+ /* XXX: verify len field validity */
+ int len = get_bits(&s->gb, 16);
+ if (len >= 2 && len < 32768) {
+ /* XXX: any better upper bound */
+ uint8_t *cbuf = av_malloc(len - 1);
+ if (cbuf) {
+ int i;
+ for (i = 0; i < len - 2; i++)
+ cbuf[i] = get_bits(&s->gb, 8);
+ if (i > 0 && cbuf[i-1] == '\n')
+ cbuf[i-1] = 0;
+ else
+ cbuf[i] = 0;
+
+ printf("mjpeg comment: '%s'\n", cbuf);
+
+ /* buggy avid, it puts EOI only at every 10th frame */
+ if (!strcmp(cbuf, "AVID"))
+ {
+ s->buggy_avid = 1;
+ // if (s->first_picture)
+ // printf("mjpeg: workarounding buggy AVID\n");
+ }
+
+ av_free(cbuf);
+ }
+ }
+
+ return 0;
+}
+
+#if 0
+static int valid_marker_list[] =
+{
+ /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */
+/* 0 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+/* 1 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+/* 2 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+/* 3 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+/* 4 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+/* 5 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+/* 6 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+/* 7 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+/* 8 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+/* 9 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+/* a */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+/* b */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+/* c */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+/* d */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+/* e */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+/* f */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
+}
+#endif
+
+/* return the 8 bit start code value and update the search
+ state. Return -1 if no start code found */
+static int find_marker(uint8_t **pbuf_ptr, uint8_t *buf_end)
+{
+ uint8_t *buf_ptr;
+ unsigned int v, v2;
+ int val;
+#ifdef DEBUG
+ int skipped=0;
+#endif
+
+ buf_ptr = *pbuf_ptr;
+ while (buf_ptr < buf_end) {
+ v = *buf_ptr++;
+ v2 = *buf_ptr;
+ if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe)) {
+ val = *buf_ptr++;
+ goto found;
+ }
+#ifdef DEBUG
+ skipped++;
+#endif
+ }
+ val = -1;
+found:
+#ifdef DEBUG
+ dprintf("find_marker skipped %d bytes\n", skipped);
+#endif
+ *pbuf_ptr = buf_ptr;
+ return val;
+}
+
+static int mjpeg_decode_frame(AVCodecContext *avctx,
+ void *data, int *data_size,
+ uint8_t *buf, int buf_size)
+{
+ MJpegDecodeContext *s = avctx->priv_data;
+ uint8_t *buf_end, *buf_ptr;
+ int i, start_code;
+ AVFrame *picture = data;
+
+ *data_size = 0;
+
+ /* no supplementary picture */
+ if (buf_size == 0)
+ return 0;
+
+ buf_ptr = buf;
+ buf_end = buf + buf_size;
+ while (buf_ptr < buf_end) {
+ /* find start next marker */
+ start_code = find_marker(&buf_ptr, buf_end);
+ {
+ /* EOF */
+ if (start_code < 0) {
+ goto the_end;
+ } else {
+ dprintf("marker=%x avail_size_in_buf=%d\n", start_code, buf_end - buf_ptr);
+
+ if ((buf_end - buf_ptr) > s->buffer_size)
+ {
+ av_free(s->buffer);
+ s->buffer_size = buf_end-buf_ptr;
+ s->buffer = av_malloc(s->buffer_size);
+ dprintf("buffer too small, expanding to %d bytes\n",
+ s->buffer_size);
+ }
+
+ /* unescape buffer of SOS */
+ if (start_code == SOS)
+ {
+ uint8_t *src = buf_ptr;
+ uint8_t *dst = s->buffer;
+
+ while (src<buf_end)
+ {
+ uint8_t x = *(src++);
+
+ *(dst++) = x;
+ if (x == 0xff)
+ {
+ while(*src == 0xff) src++;
+
+ x = *(src++);
+ if (x >= 0xd0 && x <= 0xd7)
+ *(dst++) = x;
+ else if (x)
+ break;
+ }
+ }
+ init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);
+
+ dprintf("escaping removed %d bytes\n",
+ (buf_end - buf_ptr) - (dst - s->buffer));
+ }
+ else
+ init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);
+
+ s->start_code = start_code;
+ if(s->avctx->debug & FF_DEBUG_STARTCODE){
+ printf("startcode: %X\n", start_code);
+ }
+
+ /* process markers */
+ if (start_code >= 0xd0 && start_code <= 0xd7) {
+ dprintf("restart marker: %d\n", start_code&0x0f);
+ } else if (s->first_picture) {
+ /* APP fields */
+ if (start_code >= 0xe0 && start_code <= 0xef)
+ mjpeg_decode_app(s);
+ /* Comment */
+ else if (start_code == COM)
+ mjpeg_decode_com(s);
+ }
+
+ switch(start_code) {
+ case SOI:
+ s->restart_interval = 0;
+ /* nothing to do on SOI */
+ break;
+ case DQT:
+ mjpeg_decode_dqt(s);
+ break;
+ case DHT:
+ if(mjpeg_decode_dht(s) < 0){
+ fprintf(stderr, "huffman table decode error\n");
+ return -1;
+ }
+ break;
+ case SOF0:
+ s->lossless=0;
+ if (mjpeg_decode_sof(s) < 0)
+ return -1;
+ break;
+ case SOF3:
+ s->lossless=1;
+ if (mjpeg_decode_sof(s) < 0)
+ return -1;
+ break;
+ case EOI:
+ if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
+ break;
+eoi_parser:
+ {
+ if (s->interlaced) {
+ s->bottom_field ^= 1;
+ /* if not bottom field, do not output image yet */
+ if (s->bottom_field)
+ goto not_the_end;
+ }
+ for(i=0;i<3;i++) {
+ picture->data[i] = s->current_picture[i];
+ picture->linesize[i] = (s->interlaced) ?
+ s->linesize[i] >> 1 : s->linesize[i];
+ }
+ *data_size = sizeof(AVFrame);
+ avctx->height = s->height;
+ if (s->interlaced)
+ avctx->height *= 2;
+ avctx->width = s->width;
+ /* XXX: not complete test ! */
+ switch((s->h_count[0] << 4) | s->v_count[0]) {
+ case 0x11:
+ if(s->rgb){
+ avctx->pix_fmt = PIX_FMT_RGBA32;
+ }else
+ avctx->pix_fmt = PIX_FMT_YUV444P;
+ break;
+ case 0x21:
+ avctx->pix_fmt = PIX_FMT_YUV422P;
+ break;
+ default:
+ case 0x22:
+ avctx->pix_fmt = PIX_FMT_YUV420P;
+ break;
+ }
+
+ if(!s->lossless){
+ picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]);
+ picture->qstride= 0;
+ picture->qscale_table= s->qscale_table;
+ memset(picture->qscale_table, picture->quality, (s->width+15)/16);
+ if(avctx->debug & FF_DEBUG_QP)
+ printf("QP: %d\n", (int)picture->quality);
+ }
+
+ goto the_end;
+ }
+ break;
+ case SOS:
+ mjpeg_decode_sos(s);
+ /* buggy avid puts EOI every 10-20th frame */
+ /* if restart period is over process EOI */
+ if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
+ goto eoi_parser;
+ break;
+ case DRI:
+ mjpeg_decode_dri(s);
+ break;
+ case SOF1:
+ case SOF2:
+ case SOF5:
+ case SOF6:
+ case SOF7:
+ case SOF9:
+ case SOF10:
+ case SOF11:
+ case SOF13:
+ case SOF14:
+ case SOF15:
+ case JPG:
+ printf("mjpeg: unsupported coding type (%x)\n", start_code);
+ break;
+// default:
+// printf("mjpeg: unsupported marker (%x)\n", start_code);
+// break;
+ }
+
+not_the_end:
+ /* eof process start code */
+ buf_ptr += (get_bits_count(&s->gb)+7)/8;
+ dprintf("marker parser used %d bytes (%d bits)\n",
+ (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));
+ }
+ }
+ }
+the_end:
+ dprintf("mjpeg decode frame unused %d bytes\n", buf_end - buf_ptr);
+// return buf_end - buf_ptr;
+ return buf_ptr - buf;
+}
+
+static int mjpegb_decode_frame(AVCodecContext *avctx,
+ void *data, int *data_size,
+ uint8_t *buf, int buf_size)
+{
+ MJpegDecodeContext *s = avctx->priv_data;
+ uint8_t *buf_end, *buf_ptr;
+ int i;
+ AVFrame *picture = data;
+ GetBitContext hgb; /* for the header */
+ uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs;
+ uint32_t field_size;
+
+ *data_size = 0;
+
+ /* no supplementary picture */
+ if (buf_size == 0)
+ return 0;
+
+ buf_ptr = buf;
+ buf_end = buf + buf_size;
+
+read_header:
+ /* reset on every SOI */
+ s->restart_interval = 0;
+
+ init_get_bits(&hgb, buf_ptr, /*buf_size*/(buf_end - buf_ptr)*8);
+
+ skip_bits(&hgb, 32); /* reserved zeros */
+
+ if (get_bits(&hgb, 32) != be2me_32(ff_get_fourcc("mjpg")))
+ {
+ dprintf("not mjpeg-b (bad fourcc)\n");
+ return 0;
+ }
+
+ field_size = get_bits(&hgb, 32); /* field size */
+ dprintf("field size: 0x%x\n", field_size);
+ skip_bits(&hgb, 32); /* padded field size */
+ second_field_offs = get_bits(&hgb, 32);
+ dprintf("second field offs: 0x%x\n", second_field_offs);
+ if (second_field_offs)
+ s->interlaced = 1;
+
+ dqt_offs = get_bits(&hgb, 32);
+ dprintf("dqt offs: 0x%x\n", dqt_offs);
+ if (dqt_offs)
+ {
+ init_get_bits(&s->gb, buf+dqt_offs, (buf_end - (buf+dqt_offs))*8);
+ s->start_code = DQT;
+ mjpeg_decode_dqt(s);
+ }
+
+ dht_offs = get_bits(&hgb, 32);
+ dprintf("dht offs: 0x%x\n", dht_offs);
+ if (dht_offs)
+ {
+ init_get_bits(&s->gb, buf+dht_offs, (buf_end - (buf+dht_offs))*8);
+ s->start_code = DHT;
+ mjpeg_decode_dht(s);
+ }
+
+ sof_offs = get_bits(&hgb, 32);
+ dprintf("sof offs: 0x%x\n", sof_offs);
+ if (sof_offs)
+ {
+ init_get_bits(&s->gb, buf+sof_offs, (buf_end - (buf+sof_offs))*8);
+ s->start_code = SOF0;
+ if (mjpeg_decode_sof(s) < 0)
+ return -1;
+ }
+
+ sos_offs = get_bits(&hgb, 32);
+ dprintf("sos offs: 0x%x\n", sos_offs);
+ if (sos_offs)
+ {
+// init_get_bits(&s->gb, buf+sos_offs, (buf_end - (buf+sos_offs))*8);
+ init_get_bits(&s->gb, buf+sos_offs, field_size*8);
+ s->start_code = SOS;
+ mjpeg_decode_sos(s);
+ }
+
+ skip_bits(&hgb, 32); /* start of data offset */
+
+ if (s->interlaced) {
+ s->bottom_field ^= 1;
+ /* if not bottom field, do not output image yet */
+ if (s->bottom_field && second_field_offs)
+ {
+ buf_ptr = buf + second_field_offs;
+ second_field_offs = 0;
+ goto read_header;
+ }
+ }
+
+ //XXX FIXME factorize, this looks very similar to the EOI code
+
+ for(i=0;i<3;i++) {
+ picture->data[i] = s->current_picture[i];
+ picture->linesize[i] = (s->interlaced) ?
+ s->linesize[i] >> 1 : s->linesize[i];
+ }
+ *data_size = sizeof(AVFrame);
+ avctx->height = s->height;
+ if (s->interlaced)
+ avctx->height *= 2;
+ avctx->width = s->width;
+ /* XXX: not complete test ! */
+ switch((s->h_count[0] << 4) | s->v_count[0]) {
+ case 0x11:
+ avctx->pix_fmt = PIX_FMT_YUV444P;
+ break;
+ case 0x21:
+ avctx->pix_fmt = PIX_FMT_YUV422P;
+ break;
+ default:
+ case 0x22:
+ avctx->pix_fmt = PIX_FMT_YUV420P;
+ break;
+ }
+
+ if(!s->lossless){
+ picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]);
+ picture->qstride= 0;
+ picture->qscale_table= s->qscale_table;
+ memset(picture->qscale_table, picture->quality, (s->width+15)/16);
+ if(avctx->debug & FF_DEBUG_QP)
+ printf("QP: %f\n", picture->quality);
+ }
+
+ return buf_ptr - buf;
+}
+
+
+static int mjpeg_decode_end(AVCodecContext *avctx)
+{
+ MJpegDecodeContext *s = avctx->priv_data;
+ int i, j;
+
+ av_free(s->buffer);
+ av_free(s->qscale_table);
+ for(i=0;i<MAX_COMPONENTS;i++)
+ av_free(s->current_picture[i]);
+ for(i=0;i<2;i++) {
+ for(j=0;j<4;j++)
+ free_vlc(&s->vlcs[i][j]);
+ }
+ return 0;
+}
+
+AVCodec mjpeg_decoder = {
+ "mjpeg",
+ CODEC_TYPE_VIDEO,
+ CODEC_ID_MJPEG,
+ sizeof(MJpegDecodeContext),
+ mjpeg_decode_init,
+ NULL,
+ mjpeg_decode_end,
+ mjpeg_decode_frame,
+ 0,
+ NULL
+};
+
+AVCodec mjpegb_decoder = {
+ "mjpegb",
+ CODEC_TYPE_VIDEO,
+ CODEC_ID_MJPEGB,
+ sizeof(MJpegDecodeContext),
+ mjpeg_decode_init,
+ NULL,
+ mjpeg_decode_end,
+ mjpegb_decode_frame,
+ 0,
+ NULL
+};
+
+#ifdef CONFIG_ENCODERS
+AVCodec ljpeg_encoder = { //FIXME avoid MPV_* lossless jpeg shouldnt need them
+ "ljpeg",
+ CODEC_TYPE_VIDEO,
+ CODEC_ID_LJPEG,
+ sizeof(MpegEncContext),
+ MPV_encode_init,
+ encode_picture_lossless,
+ MPV_encode_end,
+};
+#endif
projects / synfig.git / blobdiff