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FFmpeg/libavcodec/mpeg12enc.c
Limin Wang ad49dd7694 avcodec/mpeg12enc: support mpeg2 encoder const level 
Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
2020-08-14 22:48:05 +08:00

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/*
* MPEG-1/2 encoder
* Copyright (c) 2000,2001 Fabrice Bellard
* Copyright (c) 2002-2004 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
*/
/**
* @file
* MPEG-1/2 encoder
*/
#include <stdint.h>
#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "libavutil/timecode.h"
#include "libavutil/stereo3d.h"
#include "avcodec.h"
#include "bytestream.h"
#include "mathops.h"
#include "mpeg12.h"
#include "mpeg12data.h"
#include "mpegutils.h"
#include "mpegvideo.h"
#include "profiles.h"
static const uint8_t svcd_scan_offset_placeholder[] = {
0x10, 0x0E, 0x00, 0x80, 0x81, 0x00, 0x80,
0x81, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
};
static uint8_t mv_penalty[MAX_FCODE + 1][MAX_DMV * 2 + 1];
static uint8_t fcode_tab[MAX_MV * 2 + 1];
static uint8_t uni_mpeg1_ac_vlc_len[64 * 64 * 2];
static uint8_t uni_mpeg2_ac_vlc_len[64 * 64 * 2];
/* simple include everything table for dc, first byte is bits
* number next 3 are code */
static uint32_t mpeg1_lum_dc_uni[512];
static uint32_t mpeg1_chr_dc_uni[512];
static uint8_t mpeg1_index_run[2][64];
static int8_t mpeg1_max_level[2][64];
#define A53_MAX_CC_COUNT 0x1f
static av_cold void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len)
{
int i;
for (i = 0; i < 128; i++) {
int level = i - 64;
int run;
if (!level)
continue;
for (run = 0; run < 64; run++) {
int len, code;
int alevel = FFABS(level);
if (alevel > rl->max_level[0][run])
code = 111; /* rl->n */
else
code = rl->index_run[0][run] + alevel - 1;
if (code < 111) { /* rl->n */
/* length of VLC and sign */
len = rl->table_vlc[code][1] + 1;
} else {
len = rl->table_vlc[111 /* rl->n */][1] + 6;
if (alevel < 128)
len += 8;
else
len += 16;
}
uni_ac_vlc_len[UNI_AC_ENC_INDEX(run, i)] = len;
}
}
}
static int find_frame_rate_index(MpegEncContext *s)
{
int i;
AVRational bestq = (AVRational) {0, 0};
AVRational ext;
AVRational target = av_inv_q(s->avctx->time_base);
for (i = 1; i < 14; i++) {
if (s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL &&
i >= 9)
break;
for (ext.num=1; ext.num <= 4; ext.num++) {
for (ext.den=1; ext.den <= 32; ext.den++) {
AVRational q = av_mul_q(ext, ff_mpeg12_frame_rate_tab[i]);
if (s->codec_id != AV_CODEC_ID_MPEG2VIDEO && (ext.den!=1 || ext.num!=1))
continue;
if (av_gcd(ext.den, ext.num) != 1)
continue;
if ( bestq.num==0
|| av_nearer_q(target, bestq, q) < 0
|| ext.num==1 && ext.den==1 && av_nearer_q(target, bestq, q) == 0) {
bestq = q;
s->frame_rate_index = i;
s->mpeg2_frame_rate_ext.num = ext.num;
s->mpeg2_frame_rate_ext.den = ext.den;
}
}
}
}
if (av_cmp_q(target, bestq))
return -1;
else
return 0;
}
static av_cold int encode_init(AVCodecContext *avctx)
{
int ret;
MpegEncContext *s = avctx->priv_data;
if ((ret = ff_mpv_encode_init(avctx)) < 0)
return ret;
if (find_frame_rate_index(s) < 0) {
if (s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
av_log(avctx, AV_LOG_ERROR, "MPEG-1/2 does not support %d/%d fps\n",
avctx->time_base.den, avctx->time_base.num);
return AVERROR(EINVAL);
} else {
av_log(avctx, AV_LOG_INFO,
"MPEG-1/2 does not support %d/%d fps, there may be AV sync issues\n",
avctx->time_base.den, avctx->time_base.num);
}
}
if (avctx->profile == FF_PROFILE_UNKNOWN) {
if (avctx->level != FF_LEVEL_UNKNOWN) {
av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
return AVERROR(EINVAL);
}
/* Main or 4:2:2 */
avctx->profile = s->chroma_format == CHROMA_420 ? FF_PROFILE_MPEG2_MAIN : FF_PROFILE_MPEG2_422;
}
if (avctx->level == FF_LEVEL_UNKNOWN) {
if (avctx->profile == FF_PROFILE_MPEG2_422) { /* 4:2:2 */
if (avctx->width <= 720 && avctx->height <= 608)
avctx->level = 5; /* Main */
else
avctx->level = 2; /* High */
} else {
if (avctx->profile != FF_PROFILE_MPEG2_HIGH && s->chroma_format != CHROMA_420) {
av_log(avctx, AV_LOG_ERROR,
"Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
return AVERROR(EINVAL);
}
if (avctx->width <= 720 && avctx->height <= 576)
avctx->level = 8; /* Main */
else if (avctx->width <= 1440)
avctx->level = 6; /* High 1440 */
else
avctx->level = 4; /* High */
}
}
if ((avctx->width & 0xFFF) == 0 && (avctx->height & 0xFFF) == 1) {
av_log(avctx, AV_LOG_ERROR, "Width / Height is invalid for MPEG2\n");
return AVERROR(EINVAL);
}
if (s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
if ((avctx->width & 0xFFF) == 0 || (avctx->height & 0xFFF) == 0) {
av_log(avctx, AV_LOG_ERROR, "Width or Height are not allowed to be multiples of 4096\n"
"add '-strict %d' if you want to use them anyway.\n", FF_COMPLIANCE_UNOFFICIAL);
return AVERROR(EINVAL);
}
}
s->drop_frame_timecode = s->drop_frame_timecode || !!(avctx->flags2 & AV_CODEC_FLAG2_DROP_FRAME_TIMECODE);
if (s->drop_frame_timecode)
s->tc.flags |= AV_TIMECODE_FLAG_DROPFRAME;
if (s->drop_frame_timecode && s->frame_rate_index != 4) {
av_log(avctx, AV_LOG_ERROR,
"Drop frame time code only allowed with 1001/30000 fps\n");
return AVERROR(EINVAL);
}
#if FF_API_PRIVATE_OPT
FF_DISABLE_DEPRECATION_WARNINGS
if (avctx->timecode_frame_start)
s->timecode_frame_start = avctx->timecode_frame_start;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
if (s->tc_opt_str) {
AVRational rate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
int ret = av_timecode_init_from_string(&s->tc, rate, s->tc_opt_str, s);
if (ret < 0)
return ret;
s->drop_frame_timecode = !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME);
s->timecode_frame_start = s->tc.start;
} else {
s->timecode_frame_start = 0; // default is -1
}
return 0;
}
static void put_header(MpegEncContext *s, int header)
{
avpriv_align_put_bits(&s->pb);
put_bits(&s->pb, 16, header >> 16);
put_sbits(&s->pb, 16, header);
}
/* put sequence header if needed */
static void mpeg1_encode_sequence_header(MpegEncContext *s)
{
unsigned int vbv_buffer_size, fps, v;
int i, constraint_parameter_flag;
uint64_t time_code;
int64_t best_aspect_error = INT64_MAX;
AVRational aspect_ratio = s->avctx->sample_aspect_ratio;
if (aspect_ratio.num == 0 || aspect_ratio.den == 0)
aspect_ratio = (AVRational){1,1}; // pixel aspect 1.1 (VGA)
if (s->current_picture.f->key_frame) {
AVRational framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
/* MPEG-1 header repeated every GOP */
put_header(s, SEQ_START_CODE);
put_sbits(&s->pb, 12, s->width & 0xFFF);
put_sbits(&s->pb, 12, s->height & 0xFFF);
for (i = 1; i < 15; i++) {
int64_t error = aspect_ratio.num * (1LL<<32) / aspect_ratio.den;
if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO || i <= 1)
error -= (1LL<<32) / ff_mpeg1_aspect[i];
else
error -= (1LL<<32)*ff_mpeg2_aspect[i].num * s->height / s->width / ff_mpeg2_aspect[i].den;
error = FFABS(error);
if (error - 2 <= best_aspect_error) {
best_aspect_error = error;
s->aspect_ratio_info = i;
}
}
put_bits(&s->pb, 4, s->aspect_ratio_info);
put_bits(&s->pb, 4, s->frame_rate_index);
if (s->avctx->rc_max_rate) {
v = (s->avctx->rc_max_rate + 399) / 400;
if (v > 0x3ffff && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
v = 0x3ffff;
} else {
v = 0x3FFFF;
}
if (s->avctx->rc_buffer_size)
vbv_buffer_size = s->avctx->rc_buffer_size;
else
/* VBV calculation: Scaled so that a VCD has the proper
* VBV size of 40 kilobytes */
vbv_buffer_size = ((20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
vbv_buffer_size = (vbv_buffer_size + 16383) / 16384;
put_sbits(&s->pb, 18, v);
put_bits(&s->pb, 1, 1); // marker
put_sbits(&s->pb, 10, vbv_buffer_size);
constraint_parameter_flag =
s->width <= 768 &&
s->height <= 576 &&
s->mb_width * s->mb_height <= 396 &&
s->mb_width * s->mb_height * framerate.num <= 396 * 25 * framerate.den &&
framerate.num <= framerate.den * 30 &&
s->avctx->me_range &&
s->avctx->me_range < 128 &&
vbv_buffer_size <= 20 &&
v <= 1856000 / 400 &&
s->codec_id == AV_CODEC_ID_MPEG1VIDEO;
put_bits(&s->pb, 1, constraint_parameter_flag);
ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
AVFrameSideData *side_data;
int width = s->width;
int height = s->height;
int use_seq_disp_ext;
put_header(s, EXT_START_CODE);
put_bits(&s->pb, 4, 1); // seq ext
put_bits(&s->pb, 1, s->avctx->profile == FF_PROFILE_MPEG2_422); // escx 1 for 4:2:2 profile
put_bits(&s->pb, 3, s->avctx->profile); // profile
put_bits(&s->pb, 4, s->avctx->level); // level
put_bits(&s->pb, 1, s->progressive_sequence);
put_bits(&s->pb, 2, s->chroma_format);
put_bits(&s->pb, 2, s->width >> 12);
put_bits(&s->pb, 2, s->height >> 12);
put_bits(&s->pb, 12, v >> 18); // bitrate ext
put_bits(&s->pb, 1, 1); // marker
put_bits(&s->pb, 8, vbv_buffer_size >> 10); // vbv buffer ext
put_bits(&s->pb, 1, s->low_delay);
put_bits(&s->pb, 2, s->mpeg2_frame_rate_ext.num-1); // frame_rate_ext_n
put_bits(&s->pb, 5, s->mpeg2_frame_rate_ext.den-1); // frame_rate_ext_d
side_data = av_frame_get_side_data(s->current_picture_ptr->f, AV_FRAME_DATA_PANSCAN);
if (side_data) {
AVPanScan *pan_scan = (AVPanScan *)side_data->data;
if (pan_scan->width && pan_scan->height) {
width = pan_scan->width >> 4;
height = pan_scan->height >> 4;
}
}
use_seq_disp_ext = (width != s->width ||
height != s->height ||
s->avctx->color_primaries != AVCOL_PRI_UNSPECIFIED ||
s->avctx->color_trc != AVCOL_TRC_UNSPECIFIED ||
s->avctx->colorspace != AVCOL_SPC_UNSPECIFIED ||
s->video_format != VIDEO_FORMAT_UNSPECIFIED);
if (s->seq_disp_ext == 1 || (s->seq_disp_ext == -1 && use_seq_disp_ext)) {
put_header(s, EXT_START_CODE);
put_bits(&s->pb, 4, 2); // sequence display extension
put_bits(&s->pb, 3, s->video_format); // video_format
put_bits(&s->pb, 1, 1); // colour_description
put_bits(&s->pb, 8, s->avctx->color_primaries); // colour_primaries
put_bits(&s->pb, 8, s->avctx->color_trc); // transfer_characteristics
put_bits(&s->pb, 8, s->avctx->colorspace); // matrix_coefficients
put_bits(&s->pb, 14, width); // display_horizontal_size
put_bits(&s->pb, 1, 1); // marker_bit
put_bits(&s->pb, 14, height); // display_vertical_size
put_bits(&s->pb, 3, 0); // remaining 3 bits are zero padding
}
}
put_header(s, GOP_START_CODE);
put_bits(&s->pb, 1, s->drop_frame_timecode); // drop frame flag
/* time code: we must convert from the real frame rate to a
* fake MPEG frame rate in case of low frame rate */
fps = (framerate.num + framerate.den / 2) / framerate.den;
time_code = s->current_picture_ptr->f->coded_picture_number +
s->timecode_frame_start;
s->gop_picture_number = s->current_picture_ptr->f->coded_picture_number;
av_assert0(s->drop_frame_timecode == !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME));
if (s->drop_frame_timecode)
time_code = av_timecode_adjust_ntsc_framenum2(time_code, fps);
put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
put_bits(&s->pb, 1, 1);
put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
put_bits(&s->pb, 1, !!(s->avctx->flags & AV_CODEC_FLAG_CLOSED_GOP) || s->intra_only || !s->gop_picture_number);
put_bits(&s->pb, 1, 0); // broken link
}
}
static inline void encode_mb_skip_run(MpegEncContext *s, int run)
{
while (run >= 33) {
put_bits(&s->pb, 11, 0x008);
run -= 33;
}
put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
ff_mpeg12_mbAddrIncrTable[run][0]);
}
static av_always_inline void put_qscale(MpegEncContext *s)
{
put_bits(&s->pb, 5, s->qscale);
}
void ff_mpeg1_encode_slice_header(MpegEncContext *s)
{
if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->height > 2800) {
put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
/* slice_vertical_position_extension */
put_bits(&s->pb, 3, s->mb_y >> 7);
} else {
put_header(s, SLICE_MIN_START_CODE + s->mb_y);
}
put_qscale(s);
/* slice extra information */
put_bits(&s->pb, 1, 0);
}
void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
{
AVFrameSideData *side_data;
mpeg1_encode_sequence_header(s);
/* MPEG-1 picture header */
put_header(s, PICTURE_START_CODE);
/* temporal reference */
// RAL: s->picture_number instead of s->fake_picture_number
put_bits(&s->pb, 10,
(s->picture_number - s->gop_picture_number) & 0x3ff);
put_bits(&s->pb, 3, s->pict_type);
s->vbv_delay_ptr = s->pb.buf + put_bits_count(&s->pb) / 8;
put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
// RAL: Forward f_code also needed for B-frames
if (s->pict_type == AV_PICTURE_TYPE_P ||
s->pict_type == AV_PICTURE_TYPE_B) {
put_bits(&s->pb, 1, 0); /* half pel coordinates */
if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
else
put_bits(&s->pb, 3, 7); /* forward_f_code */
}
// RAL: Backward f_code necessary for B-frames
if (s->pict_type == AV_PICTURE_TYPE_B) {
put_bits(&s->pb, 1, 0); /* half pel coordinates */
if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)
put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
else
put_bits(&s->pb, 3, 7); /* backward_f_code */
}
put_bits(&s->pb, 1, 0); /* extra bit picture */
s->frame_pred_frame_dct = 1;
if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
put_header(s, EXT_START_CODE);
put_bits(&s->pb, 4, 8); /* pic ext */
if (s->pict_type == AV_PICTURE_TYPE_P ||
s->pict_type == AV_PICTURE_TYPE_B) {
put_bits(&s->pb, 4, s->f_code);
put_bits(&s->pb, 4, s->f_code);
} else {
put_bits(&s->pb, 8, 255);
}
if (s->pict_type == AV_PICTURE_TYPE_B) {
put_bits(&s->pb, 4, s->b_code);
put_bits(&s->pb, 4, s->b_code);
} else {
put_bits(&s->pb, 8, 255);
}
put_bits(&s->pb, 2, s->intra_dc_precision);
av_assert0(s->picture_structure == PICT_FRAME);
put_bits(&s->pb, 2, s->picture_structure);
if (s->progressive_sequence)
put_bits(&s->pb, 1, 0); /* no repeat */
else
put_bits(&s->pb, 1, s->current_picture_ptr->f->top_field_first);
/* XXX: optimize the generation of this flag with entropy measures */
s->frame_pred_frame_dct = s->progressive_sequence;
put_bits(&s->pb, 1, s->frame_pred_frame_dct);
put_bits(&s->pb, 1, s->concealment_motion_vectors);
put_bits(&s->pb, 1, s->q_scale_type);
put_bits(&s->pb, 1, s->intra_vlc_format);
put_bits(&s->pb, 1, s->alternate_scan);
put_bits(&s->pb, 1, s->repeat_first_field);
s->progressive_frame = s->progressive_sequence;
/* chroma_420_type */
put_bits(&s->pb, 1, s->chroma_format ==
CHROMA_420 ? s->progressive_frame : 0);
put_bits(&s->pb, 1, s->progressive_frame);
put_bits(&s->pb, 1, 0); /* composite_display_flag */
}
if (s->scan_offset) {
int i;
put_header(s, USER_START_CODE);
for (i = 0; i < sizeof(svcd_scan_offset_placeholder); i++)
put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
}
side_data = av_frame_get_side_data(s->current_picture_ptr->f,
AV_FRAME_DATA_STEREO3D);
if (side_data) {
AVStereo3D *stereo = (AVStereo3D *)side_data->data;
uint8_t fpa_type;
switch (stereo->type) {
case AV_STEREO3D_SIDEBYSIDE:
fpa_type = 0x03;
break;
case AV_STEREO3D_TOPBOTTOM:
fpa_type = 0x04;
break;
case AV_STEREO3D_2D:
fpa_type = 0x08;
break;
case AV_STEREO3D_SIDEBYSIDE_QUINCUNX:
fpa_type = 0x23;
break;
default:
fpa_type = 0;
break;
}
if (fpa_type != 0) {
put_header(s, USER_START_CODE);
put_bits(&s->pb, 8, 'J'); // S3D_video_format_signaling_identifier
put_bits(&s->pb, 8, 'P');
put_bits(&s->pb, 8, '3');
put_bits(&s->pb, 8, 'D');
put_bits(&s->pb, 8, 0x03); // S3D_video_format_length
put_bits(&s->pb, 1, 1); // reserved_bit
put_bits(&s->pb, 7, fpa_type); // S3D_video_format_type
put_bits(&s->pb, 8, 0x04); // reserved_data[0]
put_bits(&s->pb, 8, 0xFF); // reserved_data[1]
}
}
if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->a53_cc) {
side_data = av_frame_get_side_data(s->current_picture_ptr->f,
AV_FRAME_DATA_A53_CC);
if (side_data) {
if (side_data->size <= A53_MAX_CC_COUNT * 3 && side_data->size % 3 == 0) {
int i = 0;
put_header (s, USER_START_CODE);
put_bits(&s->pb, 8, 'G'); // user_identifier
put_bits(&s->pb, 8, 'A');
put_bits(&s->pb, 8, '9');
put_bits(&s->pb, 8, '4');
put_bits(&s->pb, 8, 3); // user_data_type_code
put_bits(&s->pb, 8,
(side_data->size / 3 & A53_MAX_CC_COUNT) | 0x40); // flags, cc_count
put_bits(&s->pb, 8, 0xff); // em_data
for (i = 0; i < side_data->size; i++)
put_bits(&s->pb, 8, side_data->data[i]);
put_bits(&s->pb, 8, 0xff); // marker_bits
} else {
av_log(s->avctx, AV_LOG_WARNING,
"Warning Closed Caption size (%d) can not exceed 93 bytes "
"and must be a multiple of 3\n", side_data->size);
}
}
}
s->mb_y = 0;
ff_mpeg1_encode_slice_header(s);
}
static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
int has_mv, int field_motion)
{
put_bits(&s->pb, n, bits);
if (!s->frame_pred_frame_dct) {
if (has_mv)
/* motion_type: frame/field */
put_bits(&s->pb, 2, 2 - field_motion);
put_bits(&s->pb, 1, s->interlaced_dct);
}
}
// RAL: Parameter added: f_or_b_code
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
{
if (val == 0) {
/* zero vector */
put_bits(&s->pb,
ff_mpeg12_mbMotionVectorTable[0][1],
ff_mpeg12_mbMotionVectorTable[0][0]);
} else {
int code, sign, bits;
int bit_size = f_or_b_code - 1;
int range = 1 << bit_size;
/* modulo encoding */
val = sign_extend(val, 5 + bit_size);
if (val >= 0) {
val--;
code = (val >> bit_size) + 1;
bits = val & (range - 1);
sign = 0;
} else {
val = -val;
val--;
code = (val >> bit_size) + 1;
bits = val & (range - 1);
sign = 1;
}
av_assert2(code > 0 && code <= 16);
put_bits(&s->pb,
ff_mpeg12_mbMotionVectorTable[code][1],
ff_mpeg12_mbMotionVectorTable[code][0]);
put_bits(&s->pb, 1, sign);
if (bit_size > 0)
put_bits(&s->pb, bit_size, bits);
}
}
static inline void encode_dc(MpegEncContext *s, int diff, int component)
{
unsigned int diff_u = diff + 255;
if (diff_u >= 511) {
int index;
if (diff < 0) {
index = av_log2_16bit(-2 * diff);
diff--;
} else {
index = av_log2_16bit(2 * diff);
}
if (component == 0)
put_bits(&s->pb,
ff_mpeg12_vlc_dc_lum_bits[index] + index,
(ff_mpeg12_vlc_dc_lum_code[index] << index) +
av_mod_uintp2(diff, index));
else
put_bits(&s->pb,
ff_mpeg12_vlc_dc_chroma_bits[index] + index,
(ff_mpeg12_vlc_dc_chroma_code[index] << index) +
av_mod_uintp2(diff, index));
} else {
if (component == 0)
put_bits(&s->pb,
mpeg1_lum_dc_uni[diff + 255] & 0xFF,
mpeg1_lum_dc_uni[diff + 255] >> 8);
else
put_bits(&s->pb,
mpeg1_chr_dc_uni[diff + 255] & 0xFF,
mpeg1_chr_dc_uni[diff + 255] >> 8);
}
}
static void mpeg1_encode_block(MpegEncContext *s, int16_t *block, int n)
{
int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
int code, component;
const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
last_index = s->block_last_index[n];
/* DC coef */
if (s->mb_intra) {
component = (n <= 3 ? 0 : (n & 1) + 1);
dc = block[0]; /* overflow is impossible */
diff = dc - s->last_dc[component];
encode_dc(s, diff, component);
s->last_dc[component] = dc;
i = 1;
if (s->intra_vlc_format)
table_vlc = ff_rl_mpeg2.table_vlc;
} else {
/* encode the first coefficient: needs to be done here because
* it is handled slightly differently */
level = block[0];
if (abs(level) == 1) {
code = ((uint32_t)level >> 31); /* the sign bit */
put_bits(&s->pb, 2, code | 0x02);
i = 1;
} else {
i = 0;
last_non_zero = -1;
goto next_coef;
}
}
/* now quantify & encode AC coefs */
last_non_zero = i - 1;
for (; i <= last_index; i++) {
j = s->intra_scantable.permutated[i];
level = block[j];
next_coef:
/* encode using VLC */
if (level != 0) {
run = i - last_non_zero - 1;
alevel = level;
MASK_ABS(sign, alevel);
sign &= 1;
if (alevel <= mpeg1_max_level[0][run]) {
code = mpeg1_index_run[0][run] + alevel - 1;
/* store the VLC & sign at once */
put_bits(&s->pb, table_vlc[code][1] + 1,
(table_vlc[code][0] << 1) + sign);
} else {
/* escape seems to be pretty rare <5% so I do not optimize it */
put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
/* escape: only clip in this case */
put_bits(&s->pb, 6, run);
if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
if (alevel < 128) {
put_sbits(&s->pb, 8, level);
} else {
if (level < 0)
put_bits(&s->pb, 16, 0x8001 + level + 255);
else
put_sbits(&s->pb, 16, level);
}
} else {
put_sbits(&s->pb, 12, level);
}
}
last_non_zero = i;
}
}
/* end of block */
put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
}
static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
int16_t block[8][64],
int motion_x, int motion_y,
int mb_block_count)
{
int i, cbp;
const int mb_x = s->mb_x;
const int mb_y = s->mb_y;
const int first_mb = mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
/* compute cbp */
cbp = 0;
for (i = 0; i < mb_block_count; i++)
if (s->block_last_index[i] >= 0)
cbp |= 1 << (mb_block_count - 1 - i);
if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
(mb_x != s->mb_width - 1 ||
(mb_y != s->end_mb_y - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&
((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
(s->pict_type == AV_PICTURE_TYPE_B && s->mv_dir == s->last_mv_dir &&
(((s->mv_dir & MV_DIR_FORWARD)
? ((s->mv[0][0][0] - s->last_mv[0][0][0]) |
(s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
((s->mv_dir & MV_DIR_BACKWARD)
? ((s->mv[1][0][0] - s->last_mv[1][0][0]) |
(s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
s->mb_skip_run++;
s->qscale -= s->dquant;
s->skip_count++;
s->misc_bits++;
s->last_bits++;
if (s->pict_type == AV_PICTURE_TYPE_P) {
s->last_mv[0][0][0] =
s->last_mv[0][0][1] =
s->last_mv[0][1][0] =
s->last_mv[0][1][1] = 0;
}
} else {
if (first_mb) {
av_assert0(s->mb_skip_run == 0);
encode_mb_skip_run(s, s->mb_x);
} else {
encode_mb_skip_run(s, s->mb_skip_run);
}
if (s->pict_type == AV_PICTURE_TYPE_I) {
if (s->dquant && cbp) {
/* macroblock_type: macroblock_quant = 1 */
put_mb_modes(s, 2, 1, 0, 0);
put_qscale(s);
} else {
/* macroblock_type: macroblock_quant = 0 */
put_mb_modes(s, 1, 1, 0, 0);
s->qscale -= s->dquant;
}
s->misc_bits += get_bits_diff(s);
s->i_count++;
} else if (s->mb_intra) {
if (s->dquant && cbp) {
put_mb_modes(s, 6, 0x01, 0, 0);
put_qscale(s);
} else {
put_mb_modes(s, 5, 0x03, 0, 0);
s->qscale -= s->dquant;
}
s->misc_bits += get_bits_diff(s);
s->i_count++;
memset(s->last_mv, 0, sizeof(s->last_mv));
} else if (s->pict_type == AV_PICTURE_TYPE_P) {
if (s->mv_type == MV_TYPE_16X16) {
if (cbp != 0) {
if ((motion_x | motion_y) == 0) {
if (s->dquant) {
/* macroblock_pattern & quant */
put_mb_modes(s, 5, 1, 0, 0);
put_qscale(s);
} else {
/* macroblock_pattern only */
put_mb_modes(s, 2, 1, 0, 0);
}
s->misc_bits += get_bits_diff(s);
} else {
if (s->dquant) {
put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
put_qscale(s);
} else {
put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
}
s->misc_bits += get_bits_diff(s);
// RAL: f_code parameter added
mpeg1_encode_motion(s,
motion_x - s->last_mv[0][0][0],
s->f_code);
// RAL: f_code parameter added
mpeg1_encode_motion(s,
motion_y - s->last_mv[0][0][1],
s->f_code);
s->mv_bits += get_bits_diff(s);
}
} else {
put_bits(&s->pb, 3, 1); /* motion only */
if (!s->frame_pred_frame_dct)
put_bits(&s->pb, 2, 2); /* motion_type: frame */
s->misc_bits += get_bits_diff(s);
// RAL: f_code parameter added
mpeg1_encode_motion(s,
motion_x - s->last_mv[0][0][0],
s->f_code);
// RAL: f_code parameter added
mpeg1_encode_motion(s,
motion_y - s->last_mv[0][0][1],
s->f_code);
s->qscale -= s->dquant;
s->mv_bits += get_bits_diff(s);
}
s->last_mv[0][1][0] = s->last_mv[0][0][0] = motion_x;
s->last_mv[0][1][1] = s->last_mv[0][0][1] = motion_y;
} else {
av_assert2(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
if (cbp) {
if (s->dquant) {
put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
put_qscale(s);
} else {
put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
}
} else {
put_bits(&s->pb, 3, 1); /* motion only */
put_bits(&s->pb, 2, 1); /* motion_type: field */
s->qscale -= s->dquant;
}
s->misc_bits += get_bits_diff(s);
for (i = 0; i < 2; i++) {
put_bits(&s->pb, 1, s->field_select[0][i]);
mpeg1_encode_motion(s,
s->mv[0][i][0] - s->last_mv[0][i][0],
s->f_code);
mpeg1_encode_motion(s,
s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
s->f_code);
s->last_mv[0][i][0] = s->mv[0][i][0];
s->last_mv[0][i][1] = 2 * s->mv[0][i][1];
}
s->mv_bits += get_bits_diff(s);
}
if (cbp) {
if (s->chroma_y_shift) {
put_bits(&s->pb,
ff_mpeg12_mbPatTable[cbp][1],
ff_mpeg12_mbPatTable[cbp][0]);
} else {
put_bits(&s->pb,
ff_mpeg12_mbPatTable[cbp >> 2][1],
ff_mpeg12_mbPatTable[cbp >> 2][0]);
put_sbits(&s->pb, 2, cbp);
}
}
s->f_count++;
} else {
if (s->mv_type == MV_TYPE_16X16) {
if (cbp) { // With coded bloc pattern
if (s->dquant) {
if (s->mv_dir == MV_DIR_FORWARD)
put_mb_modes(s, 6, 3, 1, 0);
else
put_mb_modes(s, 8 - s->mv_dir, 2, 1, 0);
put_qscale(s);
} else {
put_mb_modes(s, 5 - s->mv_dir, 3, 1, 0);
}
} else { // No coded bloc pattern
put_bits(&s->pb, 5 - s->mv_dir, 2);
if (!s->frame_pred_frame_dct)
put_bits(&s->pb, 2, 2); /* motion_type: frame */
s->qscale -= s->dquant;
}
s->misc_bits += get_bits_diff(s);
if (s->mv_dir & MV_DIR_FORWARD) {
mpeg1_encode_motion(s,
s->mv[0][0][0] - s->last_mv[0][0][0],
s->f_code);
mpeg1_encode_motion(s,
s->mv[0][0][1] - s->last_mv[0][0][1],
s->f_code);
s->last_mv[0][0][0] =
s->last_mv[0][1][0] = s->mv[0][0][0];
s->last_mv[0][0][1] =
s->last_mv[0][1][1] = s->mv[0][0][1];
s->f_count++;
}
if (s->mv_dir & MV_DIR_BACKWARD) {
mpeg1_encode_motion(s,
s->mv[1][0][0] - s->last_mv[1][0][0],
s->b_code);
mpeg1_encode_motion(s,
s->mv[1][0][1] - s->last_mv[1][0][1],
s->b_code);
s->last_mv[1][0][0] =
s->last_mv[1][1][0] = s->mv[1][0][0];
s->last_mv[1][0][1] =
s->last_mv[1][1][1] = s->mv[1][0][1];
s->b_count++;
}
} else {
av_assert2(s->mv_type == MV_TYPE_FIELD);
av_assert2(!s->frame_pred_frame_dct);
if (cbp) { // With coded bloc pattern
if (s->dquant) {
if (s->mv_dir == MV_DIR_FORWARD)
put_mb_modes(s, 6, 3, 1, 1);
else
put_mb_modes(s, 8 - s->mv_dir, 2, 1, 1);
put_qscale(s);
} else {
put_mb_modes(s, 5 - s->mv_dir, 3, 1, 1);
}
} else { // No coded bloc pattern
put_bits(&s->pb, 5 - s->mv_dir, 2);
put_bits(&s->pb, 2, 1); /* motion_type: field */
s->qscale -= s->dquant;
}
s->misc_bits += get_bits_diff(s);
if (s->mv_dir & MV_DIR_FORWARD) {
for (i = 0; i < 2; i++) {
put_bits(&s->pb, 1, s->field_select[0][i]);
mpeg1_encode_motion(s,
s->mv[0][i][0] - s->last_mv[0][i][0],
s->f_code);
mpeg1_encode_motion(s,
s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),
s->f_code);
s->last_mv[0][i][0] = s->mv[0][i][0];
s->last_mv[0][i][1] = s->mv[0][i][1] * 2;
}
s->f_count++;
}
if (s->mv_dir & MV_DIR_BACKWARD) {
for (i = 0; i < 2; i++) {
put_bits(&s->pb, 1, s->field_select[1][i]);
mpeg1_encode_motion(s,
s->mv[1][i][0] - s->last_mv[1][i][0],
s->b_code);
mpeg1_encode_motion(s,
s->mv[1][i][1] - (s->last_mv[1][i][1] >> 1),
s->b_code);
s->last_mv[1][i][0] = s->mv[1][i][0];
s->last_mv[1][i][1] = s->mv[1][i][1] * 2;
}
s->b_count++;
}
}
s->mv_bits += get_bits_diff(s);
if (cbp) {
if (s->chroma_y_shift) {
put_bits(&s->pb,
ff_mpeg12_mbPatTable[cbp][1],
ff_mpeg12_mbPatTable[cbp][0]);
} else {
put_bits(&s->pb,
ff_mpeg12_mbPatTable[cbp >> 2][1],
ff_mpeg12_mbPatTable[cbp >> 2][0]);
put_sbits(&s->pb, 2, cbp);
}
}
}
for (i = 0; i < mb_block_count; i++)
if (cbp & (1 << (mb_block_count - 1 - i)))
mpeg1_encode_block(s, block[i], i);
s->mb_skip_run = 0;
if (s->mb_intra)
s->i_tex_bits += get_bits_diff(s);
else
s->p_tex_bits += get_bits_diff(s);
}
}
void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],
int motion_x, int motion_y)
{
if (s->chroma_format == CHROMA_420)
mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
else
mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
}
av_cold void ff_mpeg1_encode_init(MpegEncContext *s)
{
static int done = 0;
ff_mpeg12_common_init(s);
if (!done) {
int f_code;
int mv;
int i;
done = 1;
ff_rl_init(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
ff_rl_init(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
for (i = 0; i < 64; i++) {
mpeg1_max_level[0][i] = ff_rl_mpeg1.max_level[0][i];
mpeg1_index_run[0][i] = ff_rl_mpeg1.index_run[0][i];
}
init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
if (s->intra_vlc_format)
init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
/* build unified dc encoding tables */
for (i = -255; i < 256; i++) {
int adiff, index;
int bits, code;
int diff = i;
adiff = FFABS(diff);
if (diff < 0)
diff--;
index = av_log2(2 * adiff);
bits = ff_mpeg12_vlc_dc_lum_bits[index] + index;
code = (ff_mpeg12_vlc_dc_lum_code[index] << index) +
av_mod_uintp2(diff, index);
mpeg1_lum_dc_uni[i + 255] = bits + (code << 8);
bits = ff_mpeg12_vlc_dc_chroma_bits[index] + index;
code = (ff_mpeg12_vlc_dc_chroma_code[index] << index) +
av_mod_uintp2(diff, index);
mpeg1_chr_dc_uni[i + 255] = bits + (code << 8);
}
for (f_code = 1; f_code <= MAX_FCODE; f_code++)
for (mv = -MAX_DMV; mv <= MAX_DMV; mv++) {
int len;
if (mv == 0) {
len = ff_mpeg12_mbMotionVectorTable[0][1];
} else {
int val, bit_size, code;
bit_size = f_code - 1;
val = mv;
if (val < 0)
val = -val;
val--;
code = (val >> bit_size) + 1;
if (code < 17)
len = ff_mpeg12_mbMotionVectorTable[code][1] +
1 + bit_size;
else
len = ff_mpeg12_mbMotionVectorTable[16][1] +
2 + bit_size;
}
mv_penalty[f_code][mv + MAX_DMV] = len;
}
for (f_code = MAX_FCODE; f_code > 0; f_code--)
for (mv = -(8 << f_code); mv < (8 << f_code); mv++)
fcode_tab[mv + MAX_MV] = f_code;
}
s->me.mv_penalty = mv_penalty;
s->fcode_tab = fcode_tab;
if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
s->min_qcoeff = -255;
s->max_qcoeff = 255;
} else {
s->min_qcoeff = -2047;
s->max_qcoeff = 2047;
}
if (s->intra_vlc_format) {
s->intra_ac_vlc_length =
s->intra_ac_vlc_last_length = uni_mpeg2_ac_vlc_len;
} else {
s->intra_ac_vlc_length =
s->intra_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
}
s->inter_ac_vlc_length =
s->inter_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;
}
#define OFFSET(x) offsetof(MpegEncContext, x)
#define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
#define COMMON_OPTS \
{ "gop_timecode", "MPEG GOP Timecode in hh:mm:ss[:;.]ff format. Overrides timecode_frame_start.", \
OFFSET(tc_opt_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, VE },\
{ "intra_vlc", "Use MPEG-2 intra VLC table.", \
OFFSET(intra_vlc_format), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE }, \
{ "drop_frame_timecode", "Timecode is in drop frame format.", \
OFFSET(drop_frame_timecode), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE }, \
{ "scan_offset", "Reserve space for SVCD scan offset user data.", \
OFFSET(scan_offset), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE }, \
{ "timecode_frame_start", "GOP timecode frame start number, in non-drop-frame format", \
OFFSET(timecode_frame_start), AV_OPT_TYPE_INT64, {.i64 = -1 }, -1, INT64_MAX, VE}, \
static const AVOption mpeg1_options[] = {
COMMON_OPTS
FF_MPV_COMMON_OPTS
{ NULL },
};
static const AVOption mpeg2_options[] = {
COMMON_OPTS
{ "non_linear_quant", "Use nonlinear quantizer.", OFFSET(q_scale_type), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
{ "alternate_scan", "Enable alternate scantable.", OFFSET(alternate_scan), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
{ "seq_disp_ext", "Write sequence_display_extension blocks.", OFFSET(seq_disp_ext), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE, "seq_disp_ext" },
{ "auto", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = -1}, 0, 0, VE, "seq_disp_ext" },
{ "never", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 0, VE, "seq_disp_ext" },
{ "always", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, VE, "seq_disp_ext" },
{ "video_format", "Video_format in the sequence_display_extension indicating the source of the video.", OFFSET(video_format), AV_OPT_TYPE_INT, { .i64 = VIDEO_FORMAT_UNSPECIFIED }, 0, 7, VE, "video_format" },
{ "component", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = VIDEO_FORMAT_COMPONENT }, 0, 0, VE, "video_format" },
{ "pal", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = VIDEO_FORMAT_PAL }, 0, 0, VE, "video_format" },
{ "ntsc", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = VIDEO_FORMAT_NTSC }, 0, 0, VE, "video_format" },
{ "secam", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = VIDEO_FORMAT_SECAM }, 0, 0, VE, "video_format" },
{ "mac", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = VIDEO_FORMAT_MAC }, 0, 0, VE, "video_format" },
{ "unspecified", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = VIDEO_FORMAT_UNSPECIFIED}, 0, 0, VE, "video_format" },
#define LEVEL(name, value) name, NULL, 0, AV_OPT_TYPE_CONST, { .i64 = value }, 0, 0, VE, "avctx.level"
{ LEVEL("high", 4) },
{ LEVEL("high1440", 6) },
{ LEVEL("main", 8) },
{ LEVEL("low", 10) },
#undef LEVEL
FF_MPV_COMMON_OPTS
FF_MPEG2_PROFILE_OPTS
{ NULL },
};
#define mpeg12_class(x) \
static const AVClass mpeg ## x ## _class = { \
.class_name = "mpeg" # x "video encoder", \
.item_name = av_default_item_name, \
.option = mpeg ## x ## _options, \
.version = LIBAVUTIL_VERSION_INT, \
};
mpeg12_class(1)
mpeg12_class(2)
AVCodec ff_mpeg1video_encoder = {
.name = "mpeg1video",
.long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MPEG1VIDEO,
.priv_data_size = sizeof(MpegEncContext),
.init = encode_init,
.encode2 = ff_mpv_encode_picture,
.close = ff_mpv_encode_end,
.supported_framerates = ff_mpeg12_frame_rate_tab + 1,
.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
AV_PIX_FMT_NONE },
.capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
.priv_class = &mpeg1_class,
};
AVCodec ff_mpeg2video_encoder = {
.name = "mpeg2video",
.long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MPEG2VIDEO,
.priv_data_size = sizeof(MpegEncContext),
.init = encode_init,
.encode2 = ff_mpv_encode_picture,
.close = ff_mpv_encode_end,
.supported_framerates = ff_mpeg2_frame_rate_tab,
.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUV422P,
AV_PIX_FMT_NONE },
.capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
.priv_class = &mpeg2_class,
};
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