libavcodec/mpeg4video.h - nest-android-app/ffmpeg - Git at Google

 /*
  * MPEG4 encoder/decoder internal header.
  * Copyright (c) 2000,2001 Fabrice Bellard
  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */

 #ifndef AVCODEC_MPEG4VIDEO_H
 #define AVCODEC_MPEG4VIDEO_H

 #include <stdint.h>

 #include "get_bits.h"
 #include "mpegvideo.h"
 #include "rl.h"

 // shapes
 #define RECT_SHAPE       0
 #define BIN_SHAPE        1
 #define BIN_ONLY_SHAPE   2
 #define GRAY_SHAPE       3

 #define SIMPLE_VO_TYPE           1
 #define CORE_VO_TYPE             3
 #define MAIN_VO_TYPE             4
 #define NBIT_VO_TYPE             5
 #define ARTS_VO_TYPE            10
 #define ACE_VO_TYPE             12
 #define ADV_SIMPLE_VO_TYPE      17

 // aspect_ratio_info
 #define EXTENDED_PAR 15

 //vol_sprite_usage / sprite_enable
 #define STATIC_SPRITE 1
 #define GMC_SPRITE 2

 #define MOTION_MARKER 0x1F001
 #define DC_MARKER     0x6B001

 #define VOS_STARTCODE        0x1B0
 #define USER_DATA_STARTCODE  0x1B2
 #define GOP_STARTCODE        0x1B3
 #define VISUAL_OBJ_STARTCODE 0x1B5
 #define VOP_STARTCODE        0x1B6

 /* smaller packets likely don't contain a real frame */
 #define MAX_NVOP_SIZE 19

 typedef struct Mpeg4DecContext {
     MpegEncContext m;

     /// number of bits to represent the fractional part of time
     int time_increment_bits;
     int shape;
     int vol_sprite_usage;
     int sprite_brightness_change;
     int num_sprite_warping_points;
     /// sprite trajectory points
     uint16_t sprite_traj[4][2];
     /// sprite shift [isChroma]
     int sprite_shift[2];

     // reversible vlc
     int rvlc;
     /// could this stream contain resync markers
     int resync_marker;
     /// time distance of first I -> B, used for interlaced B-frames
     int t_frame;

     int new_pred;
     int enhancement_type;
     int scalability;
     int use_intra_dc_vlc;

     /// QP above which the ac VLC should be used for intra dc
     int intra_dc_threshold;

     /* bug workarounds */
     int divx_version;
     int divx_build;
     int xvid_build;
     int lavc_build;

     /// flag for having shown the warning about invalid Divx B-frames
     int showed_packed_warning;
     /** does the stream contain the low_delay flag,
      *  used to work around buggy encoders. */
     int vol_control_parameters;
     int cplx_estimation_trash_i;
     int cplx_estimation_trash_p;
     int cplx_estimation_trash_b;
 } Mpeg4DecContext;

 /* dc encoding for mpeg4 */
 extern const uint8_t ff_mpeg4_DCtab_lum[13][2];
 extern const uint8_t ff_mpeg4_DCtab_chrom[13][2];

 extern const uint16_t ff_mpeg4_intra_vlc[103][2];
 extern const int8_t ff_mpeg4_intra_level[102];
 extern const int8_t ff_mpeg4_intra_run[102];

 extern RLTable ff_mpeg4_rl_intra;

 /* Note this is identical to the intra rvlc except that it is reordered. */
 extern RLTable ff_rvlc_rl_inter;
 extern RLTable ff_rvlc_rl_intra;

 extern const uint16_t ff_sprite_trajectory_tab[15][2];
 extern const uint8_t ff_mb_type_b_tab[4][2];

 /* these matrixes will be permuted for the idct */
 extern const int16_t ff_mpeg4_default_intra_matrix[64];
 extern const int16_t ff_mpeg4_default_non_intra_matrix[64];

 extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
 extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
 extern const uint16_t ff_mpeg4_resync_prefix[8];

 extern const uint8_t ff_mpeg4_dc_threshold[8];

 void ff_mpeg4_encode_mb(MpegEncContext *s,
                         int16_t block[6][64],
                         int motion_x, int motion_y);
 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n,
                       int dir);
 void ff_set_mpeg4_time(MpegEncContext *s);
 int ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);

 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb);
 void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
 void ff_mpeg4_clean_buffers(MpegEncContext *s);
 void ff_mpeg4_stuffing(PutBitContext *pbc);
 void ff_mpeg4_init_partitions(MpegEncContext *s);
 void ff_mpeg4_merge_partitions(MpegEncContext *s);
 void ff_clean_mpeg4_qscales(MpegEncContext *s);
 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx);
 int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx);
 void ff_mpeg4_init_direct_mv(MpegEncContext *s);
 void ff_mpeg4videodec_static_init(void);
 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx);
 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size);

 /**
  *
  * @return the mb_type
  */
 int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);

 extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2 * MAX_RUN + MAX_LEVEL + 3];

 #if 0 //3IV1 is quite rare and it slows things down a tiny bit
 #define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
 #else
 #define IS_3IV1 0
 #endif

 /**
  * Predict the dc.
  * encoding quantized level -> quantized diff
  * decoding quantized diff -> quantized level
  * @param n block index (0-3 are luma, 4-5 are chroma)
  * @param dir_ptr pointer to an integer where the prediction direction will be stored
  */
 static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level,
                                    int *dir_ptr, int encoding)
 {
     int a, b, c, wrap, pred, scale, ret;
     int16_t *dc_val;

     /* find prediction */
     if (n < 4)
         scale = s->y_dc_scale;
     else
         scale = s->c_dc_scale;
     if (IS_3IV1)
         scale = 8;

     wrap   = s->block_wrap[n];
     dc_val = s->dc_val[0] + s->block_index[n];

     /* B C
      * A X
      */
     a = dc_val[-1];
     b = dc_val[-1 - wrap];
     c = dc_val[-wrap];

     /* outside slice handling (we can't do that by memset as we need the
      * dc for error resilience) */
     if (s->first_slice_line && n != 3) {
         if (n != 2)
             b = c = 1024;
         if (n != 1 && s->mb_x == s->resync_mb_x)
             b = a = 1024;
     }
     if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) {
         if (n == 0 || n == 4 || n == 5)
             b = 1024;
     }

     if (abs(a - b) < abs(b - c)) {
         pred     = c;
         *dir_ptr = 1; /* top */
     } else {
         pred     = a;
         *dir_ptr = 0; /* left */
     }
     /* we assume pred is positive */
     pred = FASTDIV((pred + (scale >> 1)), scale);

     if (encoding) {
         ret = level - pred;
     } else {
         level += pred;
         ret    = level;
     }
     level *= scale;
     if (level & (~2047)) {
         if (!s->encoding && (s->avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE))) {
             if (level < 0) {
                 av_log(s->avctx, AV_LOG_ERROR,
                        "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
                 return -1;
             }
             if (level > 2048 + scale) {
                 av_log(s->avctx, AV_LOG_ERROR,
                        "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
                 return -1;
             }
         }
         if (level < 0)
             level = 0;
         else if (!(s->workaround_bugs & FF_BUG_DC_CLIP))
             level = 2047;
     }
     dc_val[0] = level;

     return ret;
 }

 #endif /* AVCODEC_MPEG4VIDEO_H */
	/*
	* MPEG4 encoder/decoder internal header.
	* Copyright (c) 2000,2001 Fabrice Bellard
	* Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
	*
	* This file is part of FFmpeg.
	*
	* FFmpeg is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2.1 of the License, or (at your option) any later version.
	*
	* FFmpeg is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with FFmpeg; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#ifndef AVCODEC_MPEG4VIDEO_H
	#define AVCODEC_MPEG4VIDEO_H

	#include <stdint.h>

	#include "get_bits.h"
	#include "mpegvideo.h"
	#include "rl.h"

	// shapes
	#define RECT_SHAPE 0
	#define BIN_SHAPE 1
	#define BIN_ONLY_SHAPE 2
	#define GRAY_SHAPE 3

	#define SIMPLE_VO_TYPE 1
	#define CORE_VO_TYPE 3
	#define MAIN_VO_TYPE 4
	#define NBIT_VO_TYPE 5
	#define ARTS_VO_TYPE 10
	#define ACE_VO_TYPE 12
	#define ADV_SIMPLE_VO_TYPE 17

	// aspect_ratio_info
	#define EXTENDED_PAR 15

	//vol_sprite_usage / sprite_enable
	#define STATIC_SPRITE 1
	#define GMC_SPRITE 2

	#define MOTION_MARKER 0x1F001
	#define DC_MARKER 0x6B001

	#define VOS_STARTCODE 0x1B0
	#define USER_DATA_STARTCODE 0x1B2
	#define GOP_STARTCODE 0x1B3
	#define VISUAL_OBJ_STARTCODE 0x1B5
	#define VOP_STARTCODE 0x1B6

	/* smaller packets likely don't contain a real frame */
	#define MAX_NVOP_SIZE 19

	typedef struct Mpeg4DecContext {
	MpegEncContext m;

	/// number of bits to represent the fractional part of time
	int time_increment_bits;
	int shape;
	int vol_sprite_usage;
	int sprite_brightness_change;
	int num_sprite_warping_points;
	/// sprite trajectory points
	uint16_t sprite_traj[4][2];
	/// sprite shift [isChroma]
	int sprite_shift[2];

	// reversible vlc
	int rvlc;
	/// could this stream contain resync markers
	int resync_marker;
	/// time distance of first I -> B, used for interlaced B-frames
	int t_frame;

	int new_pred;
	int enhancement_type;
	int scalability;
	int use_intra_dc_vlc;

	/// QP above which the ac VLC should be used for intra dc
	int intra_dc_threshold;

	/* bug workarounds */
	int divx_version;
	int divx_build;
	int xvid_build;
	int lavc_build;

	/// flag for having shown the warning about invalid Divx B-frames
	int showed_packed_warning;
	/** does the stream contain the low_delay flag,
	* used to work around buggy encoders. */
	int vol_control_parameters;
	int cplx_estimation_trash_i;
	int cplx_estimation_trash_p;
	int cplx_estimation_trash_b;
	} Mpeg4DecContext;

	/* dc encoding for mpeg4 */
	extern const uint8_t ff_mpeg4_DCtab_lum[13][2];
	extern const uint8_t ff_mpeg4_DCtab_chrom[13][2];

	extern const uint16_t ff_mpeg4_intra_vlc[103][2];
	extern const int8_t ff_mpeg4_intra_level[102];
	extern const int8_t ff_mpeg4_intra_run[102];

	extern RLTable ff_mpeg4_rl_intra;

	/* Note this is identical to the intra rvlc except that it is reordered. */
	extern RLTable ff_rvlc_rl_inter;
	extern RLTable ff_rvlc_rl_intra;

	extern const uint16_t ff_sprite_trajectory_tab[15][2];
	extern const uint8_t ff_mb_type_b_tab[4][2];

	/* these matrixes will be permuted for the idct */
	extern const int16_t ff_mpeg4_default_intra_matrix[64];
	extern const int16_t ff_mpeg4_default_non_intra_matrix[64];

	extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
	extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
	extern const uint16_t ff_mpeg4_resync_prefix[8];

	extern const uint8_t ff_mpeg4_dc_threshold[8];

	void ff_mpeg4_encode_mb(MpegEncContext *s,
	int16_t block[6][64],
	int motion_x, int motion_y);
	void ff_mpeg4_pred_ac(MpegEncContext s, int16_t block, int n,
	int dir);
	void ff_set_mpeg4_time(MpegEncContext *s);
	int ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);

	int ff_mpeg4_decode_picture_header(Mpeg4DecContext ctx, GetBitContext gb);
	void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
	void ff_mpeg4_clean_buffers(MpegEncContext *s);
	void ff_mpeg4_stuffing(PutBitContext *pbc);
	void ff_mpeg4_init_partitions(MpegEncContext *s);
	void ff_mpeg4_merge_partitions(MpegEncContext *s);
	void ff_clean_mpeg4_qscales(MpegEncContext *s);
	int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx);
	int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
	int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx);
	void ff_mpeg4_init_direct_mv(MpegEncContext *s);
	void ff_mpeg4videodec_static_init(void);
	int ff_mpeg4_workaround_bugs(AVCodecContext *avctx);
	int ff_mpeg4_frame_end(AVCodecContext avctx, const uint8_t buf, int buf_size);

	/**
	*
	* @return the mb_type
	*/
	int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);

	extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2 * MAX_RUN + MAX_LEVEL + 3];

	#if 0 //3IV1 is quite rare and it slows things down a tiny bit
	#define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
	#else
	#define IS_3IV1 0
	#endif

	/**
	* Predict the dc.
	* encoding quantized level -> quantized diff
	* decoding quantized diff -> quantized level
	* @param n block index (0-3 are luma, 4-5 are chroma)
	* @param dir_ptr pointer to an integer where the prediction direction will be stored
	*/
	static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level,
	int *dir_ptr, int encoding)
	{
	int a, b, c, wrap, pred, scale, ret;
	int16_t *dc_val;

	/* find prediction */
	if (n < 4)
	scale = s->y_dc_scale;
	else
	scale = s->c_dc_scale;
	if (IS_3IV1)
	scale = 8;

	wrap = s->block_wrap[n];
	dc_val = s->dc_val[0] + s->block_index[n];

	/* B C
	* A X
	*/
	a = dc_val[-1];
	b = dc_val[-1 - wrap];
	c = dc_val[-wrap];

	/* outside slice handling (we can't do that by memset as we need the
	* dc for error resilience) */
	if (s->first_slice_line && n != 3) {
	if (n != 2)
	b = c = 1024;
	if (n != 1 && s->mb_x == s->resync_mb_x)
	b = a = 1024;
	}
	if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) {
	if (n == 0 \|\| n == 4 \|\| n == 5)
	b = 1024;
	}

	if (abs(a - b) < abs(b - c)) {
	pred = c;
	dir_ptr = 1; / top */
	} else {
	pred = a;
	dir_ptr = 0; / left */
	}
	/* we assume pred is positive */
	pred = FASTDIV((pred + (scale >> 1)), scale);

	if (encoding) {
	ret = level - pred;
	} else {
	level += pred;
	ret = level;
	}
	level *= scale;
	if (level & (~2047)) {
	if (!s->encoding && (s->avctx->err_recognition & (AV_EF_BITSTREAM \| AV_EF_AGGRESSIVE))) {
	if (level < 0) {
	av_log(s->avctx, AV_LOG_ERROR,
	"dc<0 at %dx%d\n", s->mb_x, s->mb_y);
	return -1;
	}
	if (level > 2048 + scale) {
	av_log(s->avctx, AV_LOG_ERROR,
	"dc overflow at %dx%d\n", s->mb_x, s->mb_y);
	return -1;
	}
	}
	if (level < 0)
	level = 0;
	else if (!(s->workaround_bugs & FF_BUG_DC_CLIP))
	level = 2047;
	}
	dc_val[0] = level;

	return ret;
	}

	#endif /* AVCODEC_MPEG4VIDEO_H */