/*
* MJPEG encoder and decoder
- * Copyright (c) 2000, 2001 Gerard Lantau.
+ * Copyright (c) 2000, 2001 Fabrice Bellard
+ * Copyright (c) 2003 Alex Beregszaszi
+ * Copyright (c) 2003-2004 Michael Niedermayer
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * Support for external huffman table, various fixes (AVID workaround),
+ * aspecting, new decode_frame mechanism and apple mjpeg-b support
+ * by Alex Beregszaszi
*
- * This program is distributed in the hope that it will be useful,
+ * 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 2.1 of the License, or (at your option) any later version.
+ *
+ * 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 General Public License for more details.
+ * 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 General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * You should have received a copy of the GNU Lesser General Public
+ * 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"
-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];
+/**
+ * @file
+ * MJPEG encoder and decoder.
+ */
- 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;
+#include "mjpeg.h"
-#define SOF0 0xc0
-#define SOI 0xd8
-#define EOI 0xd9
-#define DQT 0xdb
-#define DHT 0xc4
-#define SOS 0xda
#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 = malloc(sizeof(MJpegContext));
- if (!m)
- return -1;
-
- /* 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)
-{
- 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);
- 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 = zigzag_direct[i];
- put_bits(p, 8, s->intra_matrix[j]);
- }
-#if 0
- 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 = p->buf_ptr;
- 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;
-}
-
-void mjpeg_picture_header(MpegEncContext *s)
-{
- put_marker(&s->pb, SOI);
-
- 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, 2); /* H factor */
- put_bits(&s->pb, 4, 2); /* 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, 1); /* H factor */
- put_bits(&s->pb, 4, 1); /* V factor */
- put_bits(&s->pb, 8, 0); /* select matrix */
-
- /* Cr component */
- put_bits(&s->pb, 8, 3); /* component number */
- put_bits(&s->pb, 4, 1); /* H factor */
- put_bits(&s->pb, 4, 1); /* V factor */
- put_bits(&s->pb, 8, 0); /* select matrix */
-
- /* 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); /* (not used) */
-}
-
-void mjpeg_picture_trailer(MpegEncContext *s)
-{
- jflush_put_bits(&s->pb);
- put_marker(&s->pb, EOI);
-}
-
-static inline void 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) {
- 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 {
- 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 {
- 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];
-} MJpegDecodeContext;
-
-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->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);
- 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);
- len -= 2;
-
- while (len >= 65) {
- /* only 8 bit precision handled */
- if (get_bits(&s->gb, 4) != 0)
- 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;
- }
- 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);
-
- 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\n", i, s->h_count[i], s->v_count[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++) {
- free(s->current_picture[i]);
- s->current_picture[i] = NULL;
- }
- 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;
- }
-
- return 0;
-}
-
-static inline int decode_dc(MJpegDecodeContext *s, int dc_index)
-{
- VLC *dc_vlc;
- int code, diff;
-
- dc_vlc = &s->vlcs[0][dc_index];
- code = get_vlc(&s->gb, dc_vlc);
- if (code < 0)
- 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;
-
- quant_matrix = s->quant_matrixes[quant_index];
- /* DC coef */
- val = decode_dc(s, dc_index);
- if (val == 0xffff) {
- dprintf("error dc\n");
- return -1;
- }
- 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)
- return -1;
- vmax = 0;
- hmax = 0;
- for(i=0;i<nb_components;i++) {
- id = get_bits(&s->gb, 8) - 1;
- /* find component index */
- for(index=0;index<s->nb_components;index++)
- if (id == s->component_id[index])
- break;
- if (index == s->nb_components)
- 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);
- if (dc_index[i] >= 4)
- return -1;
- ac_index[i] = get_bits(&s->gb, 4);
- if (ac_index[i] >= 4)
- return -1;
- }
- get_bits(&s->gb, 8); /* Ss */
- get_bits(&s->gb, 8); /* Se */
- get_bits(&s->gb, 8); /* not used */
-
- 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;
- 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 %d %d\n", mb_y, mb_x);
- ret = -1;
- goto the_end;
- }
- 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;
-}
-
-/* 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, start_code, input_size, i;
- AVPicture *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) {
- 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 we got FF 00, we copy FF to the stream to unescape FF 00 */
- if (code == 0) {
- s->buf_ptr--;
- } else if (code > 0) {
- /* 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:
- /* 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) {
- 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;
- }
- }
- }
- }
- 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++)
- 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,
-};
projects / ffmpeg / blobdiff