/*
* MJPEG encoder and decoder
- * Copyright (c) 2000, 2001 Fabrice Bellard.
+ * Copyright (c) 2000, 2001 Fabrice Bellard
+ * Copyright (c) 2003 Alex Beregszaszi
+ * Copyright (c) 2003-2004 Michael Niedermayer
*
- * This library is free software; you can redistribute it and/or
+ * Support for external huffman table, various fixes (AVID workaround),
+ * aspecting, new decode_frame mechanism and apple mjpeg-b support
+ * by Alex Beregszaszi
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with 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 and various fixes (AVID workaround) by
- * Alex Beregszaszi <alex@naxine.org>
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-//#define DEBUG
-#include "avcodec.h"
-#include "dsputil.h"
-#include "mpegvideo.h"
-
-#ifdef USE_FASTMEMCPY
-#include "fastmemcpy.h"
-#endif
-
-/* use two quantizer table (one for luminance and one for chrominance) */
-/* not yet working */
-#undef TWOMATRIXES
-
-typedef struct MJpegContext {
- UINT8 huff_size_dc_luminance[12];
- UINT16 huff_code_dc_luminance[12];
- UINT8 huff_size_dc_chrominance[12];
- UINT16 huff_code_dc_chrominance[12];
-
- UINT8 huff_size_ac_luminance[256];
- UINT16 huff_code_ac_luminance[256];
- UINT8 huff_size_ac_chrominance[256];
- UINT16 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 */
+/**
+ * @file
+ * MJPEG encoder and decoder.
+ */
- TEM = 0x01, /* temporary private use for arithmetic coding */
+#include "mjpeg.h"
- /* 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] = {
+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,
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] = {
+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,
/* 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 bits_dc_luminance[17] =
+const uint8_t ff_mjpeg_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 val_dc_luminance[] =
+const uint8_t ff_mjpeg_val_dc[12] =
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
-static const UINT8 bits_dc_chrominance[17] =
+const uint8_t ff_mjpeg_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 val_dc_chrominance[] =
-{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
-static const UINT8 bits_ac_luminance[17] =
+const uint8_t ff_mjpeg_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 val_ac_luminance[] =
+const uint8_t ff_mjpeg_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,
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
+ 0xf9, 0xfa
};
-static const UINT8 bits_ac_chrominance[17] =
+const uint8_t ff_mjpeg_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 val_ac_chrominance[] =
+const uint8_t ff_mjpeg_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,
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
+ 0xf9, 0xfa
};
/* isn't this function nicer than the one in the libjpeg ? */
-static void build_huffman_codes(UINT8 *huff_size, UINT16 *huff_code,
- const UINT8 *bits_table, const UINT8 *val_table)
+void ff_mjpeg_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 <<= 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;
- s->intra_quant_bias= 1<<(QUANT_BIAS_SHIFT-1); //(a + x/2)/x
-
- /* 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);
-}
-
-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 *bits_table, const UINT8 *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 *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 = zigzag_direct[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 = zigzag_direct[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 *ptr;
-
-#if 0
- /* 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, 0x101);
- put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
- put_bits(p, 16, 1); /* aspect: 1:1 */
- put_bits(p, 16, 1);
- put_bits(p, 8, 0); /* thumbnail width */
- put_bits(p, 8, 0); /* thumbnail height */
-#endif
-
- /* comment */
- put_marker(p, COM);
- flush_put_bits(p);
- ptr = pbBufPtr(p);
- put_bits(p, 16, 0); /* patched later */
-#define VERSION "FFmpeg" LIBAVCODEC_VERSION "b" LIBAVCODEC_BUILD_STR
- put_string(p, VERSION);
- size = strlen(VERSION)+3;
-#undef VERSION
- ptr[0] = size >> 8;
- ptr[1] = size;
-}
-
-void mjpeg_picture_header(MpegEncContext *s)
-{
- 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, SOF0);
-
- put_bits(&s->pb, 16, 17);
- 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, 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, 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, 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, 1); /* AC huffman table index */
-
- put_bits(&s->pb, 8, 0); /* Ss (not used) */
- put_bits(&s->pb, 8, 63); /* Se (not used) */
- put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */
-}
-
-void mjpeg_picture_trailer(MpegEncContext *s)
-{
- jflush_put_bits(&s->pb);
- put_marker(&s->pb, EOI);
-}
-
-static inline void mjpeg_encode_dc(MpegEncContext *s, int val,
- UINT8 *huff_size, UINT16 *huff_code)
-{
- int mant, nbits;
-
- if (val == 0) {
- jput_bits(&s->pb, huff_size[0], huff_code[0]);
- } else {
- mant = val;
- if (val < 0) {
- val = -val;
- mant--;
- }
-
- /* compute the log (XXX: optimize) */
- nbits = 0;
- while (val != 0) {
- val = val >> 1;
- nbits++;
- }
-
- jput_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
-
- jput_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 *huff_size_ac;
- UINT16 *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 = zigzag_direct[i];
- val = block[j];
- if (val == 0) {
- run++;
- } else {
- while (run >= 16) {
- jput_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
- run -= 16;
- }
- mant = val;
- if (val < 0) {
- val = -val;
- mant--;
- }
-
- /* compute the log (XXX: optimize) */
- nbits = 0;
- while (val != 0) {
- val = val >> 1;
- nbits++;
- }
- code = (run << 4) | nbits;
-
- jput_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
-
- jput_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));
- run = 0;
- }
- }
-
- /* output EOB only if not already 64 values */
- if (last_index < 63 || run != 0)
- jput_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);
- }
-}
-
-/******************************************/
-/* decoding */
-
-/* compressed picture size */
-#define PICTURE_BUFFER_SIZE 100000
-
-#define MAX_COMPONENTS 4
-
-typedef struct MJpegDecodeContext {
- AVCodecContext *avctx;
- GetBitContext gb;
- UINT32 header_state;
- int start_code; /* current start code */
- UINT8 *buf_ptr;
- int buffer_size;
- int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
- INT16 quant_matrixes[4][64];
- VLC vlcs[2][4];
-
- 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 width, 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 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 *current_picture[MAX_COMPONENTS]; /* picture structure */
- int linesize[MAX_COMPONENTS];
- DCTELEM block[64] __align8;
- UINT8 buffer[PICTURE_BUFFER_SIZE];
-
- int buggy_avid;
- int restart_interval;
- int restart_count;
- int interleaved_rows;
-} MJpegDecodeContext;
-
-#define SKIP_REMAINING(gb, len) { \
- dprintf("reamining %d bytes in marker\n", len); \
- if (len) while (--len) \
- skip_bits(gb, 8); \
-}
-
-static int mjpeg_decode_dht(MJpegDecodeContext *s, UINT8 *buf, int buf_size);
-
-static void build_vlc(VLC *vlc, const UINT8 *bits_table, const UINT8 *val_table,
- int nb_codes)
-{
- UINT8 huff_size[256];
- UINT16 huff_code[256];
-
- memset(huff_size, 0, sizeof(huff_size));
- build_huffman_codes(huff_size, huff_code, bits_table, val_table);
-
- 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;
-
- s->avctx = avctx;
-
- s->header_state = 0;
- s->mpeg_enc_ctx_allocated = 0;
- s->buffer_size = PICTURE_BUFFER_SIZE - 1; /* minus 1 to take into
- account FF 00 case */
- s->start_code = -1;
- s->buf_ptr = s->buffer;
- 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");
- mjpeg_decode_dht(s, avctx->extradata, avctx->extradata_size);
- /* should check for error - but dunno */
- }
- return 0;
-}
-
-/* quantize tables */
-static int mjpeg_decode_dqt(MJpegDecodeContext *s,
- UINT8 *buf, int buf_size)
-{
- int len, index, i, j;
- init_get_bits(&s->gb, buf, buf_size);
-
- 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 = zigzag_direct[i];
- s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
- }
- len -= 65;
- }
-
- SKIP_REMAINING(&s->gb, len);
-
- return 0;
-}
-
-/* decode huffman tables and build VLC decoders */
-static int mjpeg_decode_dht(MJpegDecodeContext *s,
- UINT8 *buf, int buf_size)
-{
- int len, index, i, class, n, v, code_max;
- UINT8 bits_table[17];
- UINT8 val_table[256];
-
- init_get_bits(&s->gb, buf, buf_size);
-
- len = get_bits(&s->gb, 16);
- len -= 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);
- build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1);
- }
- return 0;
-}
-
-static int mjpeg_decode_sof0(MJpegDecodeContext *s,
- UINT8 *buf, int buf_size)
-{
- int len, nb_components, i, width, height;
-
- init_get_bits(&s->gb, buf, buf_size);
-
- /* XXX: verify len field validity */
- len = get_bits(&s->gb, 16);
- /* only 8 bits/component accepted */
- if (get_bits(&s->gb, 8) != 8)
- 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 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]);
- 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 = 0;
- }
-
- 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;
- /* memory test is done in mjpeg_decode_sos() */
- s->current_picture[i] = av_mallocz(w * h);
- }
- 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, diff;
-
- code = get_vlc(&s->gb, &s->vlcs[0][dc_index]);
- 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 == 0) {
- diff = 0;
- } else {
- diff = get_bits(&s->gb, code);
- if ((diff & (1 << (code - 1))) == 0)
- diff = (-1 << code) | (diff + 1);
- }
- return diff;
-}
-
-/* decode block and dequantize */
-static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
- int component, int dc_index, int ac_index, int quant_index)
-{
- int nbits, code, i, j, level;
- int run, val;
- VLC *ac_vlc;
- INT16 *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_vlc(&s->gb, ac_vlc);
- if (code < 0) {
- dprintf("error ac\n");
- return -1;
- }
- /* EOB */
- if (code == 0)
- break;
- if (code == 0xf0) {
- i += 16;
- } else {
- run = code >> 4;
- nbits = code & 0xf;
- level = get_bits(&s->gb, nbits);
- if ((level & (1 << (nbits - 1))) == 0)
- level = (-1 << nbits) | (level + 1);
- i += run;
- if (i >= 64) {
- dprintf("error count: %d\n", i);
- return -1;
- }
- j = zigzag_direct[i];
- block[j] = level * quant_matrix[j];
- i++;
- if (i >= 64)
- break;
- }
- }
- return 0;
-}
-
-static int mjpeg_decode_sos(MJpegDecodeContext *s,
- UINT8 *buf, int buf_size)
-{
- int len, nb_components, i, j, n, h, v, ret;
- int mb_width, mb_height, mb_x, mb_y, vmax, hmax, index, id;
- int comp_index[4];
- int dc_index[4];
- int ac_index[4];
- int nb_blocks[4];
- int h_count[4];
- int v_count[4];
-
- init_get_bits(&s->gb, buf, buf_size);
- /* XXX: verify len field validity */
- len = get_bits(&s->gb, 16);
- nb_components = get_bits(&s->gb, 8);
- /* 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;
- }
-
- comp_index[i] = index;
- nb_blocks[i] = s->h_count[index] * s->v_count[index];
- h_count[i] = s->h_count[index];
- v_count[i] = s->v_count[index];
-
- dc_index[i] = get_bits(&s->gb, 4);
- ac_index[i] = get_bits(&s->gb, 4);
-
- if (dc_index[i] < 0 || ac_index[i] < 0 ||
- dc_index[i] >= 4 || ac_index[i] >= 4)
- goto out_of_range;
- 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;
- }
- }
- skip_bits(&s->gb, 8); /* Ss */
- skip_bits(&s->gb, 8); /* Se */
- skip_bits(&s->gb, 8); /* Ah and Al (each are 4 bits) */
-
- for(i=0;i<nb_components;i++)
- s->last_dc[i] = 1024;
-
- if (nb_components > 1) {
- /* interleaved stream */
- mb_width = (s->width + s->h_max * 8 - 1) / (s->h_max * 8);
- mb_height = (s->height + s->v_max * 8 - 1) / (s->v_max * 8);
- } else {
- h = s->h_max / s->h_count[comp_index[0]];
- v = s->v_max / s->v_count[comp_index[0]];
- mb_width = (s->width + h * 8 - 1) / (h * 8);
- mb_height = (s->height + v * 8 - 1) / (v * 8);
- nb_blocks[0] = 1;
- h_count[0] = 1;
- v_count[0] = 1;
- }
-
- for(mb_y = 0; mb_y < mb_height; mb_y++) {
- for(mb_x = 0; mb_x < mb_width; mb_x++) {
- for(i=0;i<nb_components;i++) {
- UINT8 *ptr;
- int x, y, c;
- n = nb_blocks[i];
- c = comp_index[i];
- h = h_count[i];
- v = v_count[i];
- x = 0;
- y = 0;
- if (s->restart_interval && !s->restart_count)
- s->restart_count = s->restart_interval;
- for(j=0;j<n;j++) {
- memset(s->block, 0, sizeof(s->block));
- if (decode_block(s, s->block, i,
- dc_index[i], ac_index[i],
- s->quant_index[c]) < 0) {
- dprintf("error y=%d x=%d\n", mb_y, mb_x);
- ret = -1;
- goto the_end;
- }
-// dprintf("mb: %d %d processed\n", mb_y, mb_x);
- ff_idct (s->block);
- 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;
- put_pixels_clamped(s->block, ptr, s->linesize[c]);
- if (++x == h) {
- x = 0;
- y++;
- }
- }
- }
- }
- }
- ret = 0;
- the_end:
- emms_c();
- return ret;
- out_of_range:
- dprintf("decode_sos: ac/dc index out of range\n");
- return -1;
-}
-
-static int mjpeg_decode_dri(MJpegDecodeContext *s,
- UINT8 *buf, int buf_size)
-{
- init_get_bits(&s->gb, buf, buf_size);
-
- if (get_bits(&s->gb, 16) != 4)
- return -1;
- s->restart_interval = get_bits(&s->gb, 16);
- printf("restart interval: %d\n", s->restart_interval);
-
- return 0;
-}
-
-#define FOURCC(a,b,c,d) ((a << 24) | (b << 16) | (c << 8) | d)
-static int mjpeg_decode_app(MJpegDecodeContext *s,
- UINT8 *buf, int buf_size, int start_code)
-{
- int len, id;
-
- init_get_bits(&s->gb, buf, buf_size);
-
- /* 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);
- len -= 6;
-
- /* buggy AVID, it puts EOI only at every 10th frame */
- /* also this fourcc is used by non-avid files too, it means
- interleaving, but it's always present in AVID files */
- if (id == FOURCC('A','V','I','1'))
- {
- /* 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->interleaved_rows = 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->interleaved_rows)
- printf("mjpeg: interleaved rows: %d\n", s->interleaved_rows);
- goto out;
- }
-
- len -= 2;
-
- if (id == FOURCC('J','F','I','F'))
- {
- 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));
- goto out;
- }
-
- /* Apple MJPEG-A */
- if ((start_code == APP1) && (len > (0x28 - 8)))
- {
- id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
- len -= 4;
- if (id == FOURCC('m','j','p','g')) /* 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:
- /* should check for further values.. */
- SKIP_REMAINING(&s->gb, len);
-
- return 0;
-}
-#undef FOURCC
-
-static int mjpeg_decode_com(MJpegDecodeContext *s,
- UINT8 *buf, int buf_size)
-{
- int len, i;
- UINT8 *cbuf;
-
- init_get_bits(&s->gb, buf, buf_size);
-
- /* XXX: verify len field validity */
- len = get_bits(&s->gb, 16)-2;
- cbuf = av_malloc(len+1);
-
- for (i = 0; i < len; i++)
- cbuf[i] = get_bits(&s->gb, 8);
- if (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;
-}
-
-/* return the 8 bit start code value and update the search
- state. Return -1 if no start code found */
-static int find_marker(UINT8 **pbuf_ptr, UINT8 *buf_end,
- UINT32 *header_state)
-{
- UINT8 *buf_ptr;
- unsigned int state, v;
- int val;
-
- state = *header_state;
- buf_ptr = *pbuf_ptr;
- if (state) {
- /* get marker */
- found:
- if (buf_ptr < buf_end) {
- val = *buf_ptr++;
- state = 0;
- } else {
- val = -1;
- }
- } else {
- while (buf_ptr < buf_end) {
- v = *buf_ptr++;
- if (v == 0xff) {
- state = 1;
- goto found;
- }
- }
- val = -1;
- }
- *pbuf_ptr = buf_ptr;
- *header_state = state;
- return val;
-}
-
-static int mjpeg_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- UINT8 *buf, int buf_size)
-{
- MJpegDecodeContext *s = avctx->priv_data;
- UINT8 *buf_end, *buf_ptr, *buf_start;
- int len, code, input_size, i;
- AVPicture *picture = data;
- unsigned int start_code;
-
- *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) {
- buf_start = buf_ptr;
- /* find start next marker */
- code = find_marker(&buf_ptr, buf_end, &s->header_state);
- /* copy to buffer */
- len = buf_ptr - buf_start;
- if (len + (s->buf_ptr - s->buffer) > s->buffer_size) {
- /* data too big : flush */
- s->buf_ptr = s->buffer;
- if (code > 0)
- s->start_code = code;
- } else {
- memcpy(s->buf_ptr, buf_start, len);
- s->buf_ptr += len;
- if (code < 0) {
- /* nothing to do: wait next marker */
- } else if (code == 0 || code == 0xff) {
- /* if we got FF 00, we copy FF to the stream to unescape FF 00 */
- /* valid marker code is between 00 and ff - alex */
- s->buf_ptr--;
- } else {
- /* prepare data for next start code */
- input_size = s->buf_ptr - s->buffer;
- start_code = s->start_code;
- s->buf_ptr = s->buffer;
- s->start_code = code;
- dprintf("marker=%x\n", start_code);
- switch(start_code) {
- case SOI:
- s->restart_interval = 0;
- /* nothing to do on SOI */
- break;
- case DQT:
- mjpeg_decode_dqt(s, s->buffer, input_size);
- break;
- case DHT:
- mjpeg_decode_dht(s, s->buffer, input_size);
- break;
- case SOF0:
- mjpeg_decode_sof0(s, s->buffer, input_size);
- break;
- case SOS:
- mjpeg_decode_sos(s, s->buffer, input_size);
- if (s->start_code == EOI || s->buggy_avid || s->restart_interval) {
- int l;
- if (s->interlaced) {
- s->bottom_field ^= 1;
- /* if not bottom field, do not output image yet */
- if (s->bottom_field)
- goto the_end;
- }
- for(i=0;i<3;i++) {
- picture->data[i] = s->current_picture[i];
- l = s->linesize[i];
- if (s->interlaced)
- l >>= 1;
- picture->linesize[i] = l;
- }
- *data_size = sizeof(AVPicture);
- 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;
- }
- /* dummy quality */
- /* XXX: infer it with matrix */
- avctx->quality = 3;
- goto the_end;
- }
- break;
- case DRI:
- mjpeg_decode_dri(s, s->buffer, input_size);
- break;
- case SOF1:
- case SOF2:
- case SOF3:
- 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);
- return -1;
- }
-#if 1
- 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, s->buffer, input_size, start_code);
- /* Comment */
- else if (start_code == COM)
- mjpeg_decode_com(s, s->buffer, input_size);
- }
-#endif
- }
- }
- }
- the_end:
- return buf_ptr - buf;
-}
-
-static int mjpeg_decode_end(AVCodecContext *avctx)
-{
- MJpegDecodeContext *s = avctx->priv_data;
- int i, j;
-
- 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
-};