FFmpeg/libavcodec/libxvidff.c
Michael Niedermayer 72153419b5 Merge remote branch 'qatar/master'
* qatar/master: (33 commits)
  rtpdec_qdm2: Don't try to parse data packet if no configuration is received
  ac3enc: put the counting of stereo rematrixing bits in the same place to make the code easier to understand.
  ac3enc: clean up count_frame_bits() and count_frame_bits_fixed()
  mpegvideo: make FF_DEBUG_DCT_COEFF output coeffs via av_log() instead of just via AVFrame.
  srtdec: make sure we don't write past the end of buffer
  wmaenc: improve channel count and bitrate error handling in encode_init()
  matroskaenc: make sure we don't produce invalid file with no codec ID
  matroskadec: check that pointers were initialized before accessing them
  lavf: fix function name in compute_pkt_fields2 av_dlog message
  lavf: fix av_find_best_stream when providing a wanted stream.
  lavf: fix av_find_best_stream when decoder_ret is given and using a related stream.
  ffmpeg: factorize quality calculation
  tiff: add support for SamplesPerPixel tag in tiff_decode_tag()
  tiff: Prefer enum TiffCompr over int for TiffContext.compr.
  mov: Support edit list atom version 1.
  configure: Enable libpostproc automatically if GPL code is enabled.
  Cosmetics: fix prototypes in oggdec
  oggdec: fix memleak with continuous streams.
  matroskaenc: add missing new line in av_log() call
  dnxhdenc: add AVClass in private context.
  ...

swscale changes largely rewritten by me or replaced by baptsites due to lots of bugs in ronalds code.
Above code is also just in case its not obvios to a large extended duplicates that where cherry picked
from ffmpeg.

Conflicts:
	configure
	ffmpeg.c
	libavformat/matroskaenc.c
	libavutil/pixfmt.h
	libswscale/ppc/swscale_template.c
	libswscale/swscale.c
	libswscale/swscale_template.c
	libswscale/utils.c
	libswscale/x86/swscale_template.c
	tests/fate/h264.mak
	tests/ref/lavfi/pixdesc_le
	tests/ref/lavfi/pixfmts_copy_le
	tests/ref/lavfi/pixfmts_null_le
	tests/ref/lavfi/pixfmts_scale_le
	tests/ref/lavfi/pixfmts_vflip_le

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2011-05-13 04:40:40 +02:00

823 lines
27 KiB
C

/*
* Interface to xvidcore for mpeg4 encoding
* Copyright (c) 2004 Adam Thayer <krevnik@comcast.net>
*
* 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
* Interface to xvidcore for MPEG-4 compliant encoding.
* @author Adam Thayer (krevnik@comcast.net)
*/
#include <xvid.h>
#include <unistd.h>
#include "avcodec.h"
#include "libavutil/cpu.h"
#include "libavutil/intreadwrite.h"
#include "libxvid_internal.h"
#if !HAVE_MKSTEMP
#include <fcntl.h>
#endif
/**
* Buffer management macros.
*/
#define BUFFER_SIZE 1024
#define BUFFER_REMAINING(x) (BUFFER_SIZE - strlen(x))
#define BUFFER_CAT(x) (&((x)[strlen(x)]))
/**
* Structure for the private Xvid context.
* This stores all the private context for the codec.
*/
struct xvid_context {
void *encoder_handle; /**< Handle for Xvid encoder */
int xsize; /**< Frame x size */
int ysize; /**< Frame y size */
int vop_flags; /**< VOP flags for Xvid encoder */
int vol_flags; /**< VOL flags for Xvid encoder */
int me_flags; /**< Motion Estimation flags */
int qscale; /**< Do we use constant scale? */
int quicktime_format; /**< Are we in a QT-based format? */
AVFrame encoded_picture; /**< Encoded frame information */
char *twopassbuffer; /**< Character buffer for two-pass */
char *old_twopassbuffer; /**< Old character buffer (two-pass) */
char *twopassfile; /**< second pass temp file name */
unsigned char *intra_matrix; /**< P-Frame Quant Matrix */
unsigned char *inter_matrix; /**< I-Frame Quant Matrix */
};
/**
* Structure for the private first-pass plugin.
*/
struct xvid_ff_pass1 {
int version; /**< Xvid version */
struct xvid_context *context; /**< Pointer to private context */
};
/* Prototypes - See function implementation for details */
int xvid_strip_vol_header(AVCodecContext *avctx, unsigned char *frame, unsigned int header_len, unsigned int frame_len);
int xvid_ff_2pass(void *ref, int opt, void *p1, void *p2);
void xvid_correct_framerate(AVCodecContext *avctx);
/* Wrapper to work around the lack of mkstemp() on mingw.
* Also, tries to create file in /tmp first, if possible.
* *prefix can be a character constant; *filename will be allocated internally.
* @return file descriptor of opened file (or -1 on error)
* and opened file name in **filename. */
int ff_tempfile(const char *prefix, char **filename) {
int fd=-1;
#if !HAVE_MKSTEMP
*filename = tempnam(".", prefix);
#else
size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
*filename = av_malloc(len);
#endif
/* -----common section-----*/
if (*filename == NULL) {
av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
return -1;
}
#if !HAVE_MKSTEMP
fd = open(*filename, O_RDWR | O_BINARY | O_CREAT, 0444);
#else
snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
fd = mkstemp(*filename);
if (fd < 0) {
snprintf(*filename, len, "./%sXXXXXX", prefix);
fd = mkstemp(*filename);
}
#endif
/* -----common section-----*/
if (fd < 0) {
av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
return -1;
}
return fd; /* success */
}
#if CONFIG_LIBXVID_ENCODER
/**
* Create the private context for the encoder.
* All buffers are allocated, settings are loaded from the user,
* and the encoder context created.
*
* @param avctx AVCodecContext pointer to context
* @return Returns 0 on success, -1 on failure
*/
static av_cold int xvid_encode_init(AVCodecContext *avctx) {
int xerr, i;
int xvid_flags = avctx->flags;
struct xvid_context *x = avctx->priv_data;
uint16_t *intra, *inter;
int fd;
xvid_plugin_single_t single;
struct xvid_ff_pass1 rc2pass1;
xvid_plugin_2pass2_t rc2pass2;
xvid_gbl_init_t xvid_gbl_init;
xvid_enc_create_t xvid_enc_create;
xvid_enc_plugin_t plugins[7];
/* Bring in VOP flags from ffmpeg command-line */
x->vop_flags = XVID_VOP_HALFPEL; /* Bare minimum quality */
if( xvid_flags & CODEC_FLAG_4MV )
x->vop_flags |= XVID_VOP_INTER4V; /* Level 3 */
if( avctx->trellis
)
x->vop_flags |= XVID_VOP_TRELLISQUANT; /* Level 5 */
if( xvid_flags & CODEC_FLAG_AC_PRED )
x->vop_flags |= XVID_VOP_HQACPRED; /* Level 6 */
if( xvid_flags & CODEC_FLAG_GRAY )
x->vop_flags |= XVID_VOP_GREYSCALE;
/* Decide which ME quality setting to use */
x->me_flags = 0;
switch( avctx->me_method ) {
case ME_FULL: /* Quality 6 */
x->me_flags |= XVID_ME_EXTSEARCH16
| XVID_ME_EXTSEARCH8;
case ME_EPZS: /* Quality 4 */
x->me_flags |= XVID_ME_ADVANCEDDIAMOND8
| XVID_ME_HALFPELREFINE8
| XVID_ME_CHROMA_PVOP
| XVID_ME_CHROMA_BVOP;
case ME_LOG: /* Quality 2 */
case ME_PHODS:
case ME_X1:
x->me_flags |= XVID_ME_ADVANCEDDIAMOND16
| XVID_ME_HALFPELREFINE16;
case ME_ZERO: /* Quality 0 */
default:
break;
}
/* Decide how we should decide blocks */
switch( avctx->mb_decision ) {
case 2:
x->vop_flags |= XVID_VOP_MODEDECISION_RD;
x->me_flags |= XVID_ME_HALFPELREFINE8_RD
| XVID_ME_QUARTERPELREFINE8_RD
| XVID_ME_EXTSEARCH_RD
| XVID_ME_CHECKPREDICTION_RD;
case 1:
if( !(x->vop_flags & XVID_VOP_MODEDECISION_RD) )
x->vop_flags |= XVID_VOP_FAST_MODEDECISION_RD;
x->me_flags |= XVID_ME_HALFPELREFINE16_RD
| XVID_ME_QUARTERPELREFINE16_RD;
default:
break;
}
/* Bring in VOL flags from ffmpeg command-line */
x->vol_flags = 0;
if( xvid_flags & CODEC_FLAG_GMC ) {
x->vol_flags |= XVID_VOL_GMC;
x->me_flags |= XVID_ME_GME_REFINE;
}
if( xvid_flags & CODEC_FLAG_QPEL ) {
x->vol_flags |= XVID_VOL_QUARTERPEL;
x->me_flags |= XVID_ME_QUARTERPELREFINE16;
if( x->vop_flags & XVID_VOP_INTER4V )
x->me_flags |= XVID_ME_QUARTERPELREFINE8;
}
memset(&xvid_gbl_init, 0, sizeof(xvid_gbl_init));
xvid_gbl_init.version = XVID_VERSION;
xvid_gbl_init.debug = 0;
#if ARCH_PPC
/* Xvid's PPC support is borked, use libavcodec to detect */
#if HAVE_ALTIVEC
if (av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC) {
xvid_gbl_init.cpu_flags = XVID_CPU_FORCE | XVID_CPU_ALTIVEC;
} else
#endif
xvid_gbl_init.cpu_flags = XVID_CPU_FORCE;
#else
/* Xvid can detect on x86 */
xvid_gbl_init.cpu_flags = 0;
#endif
/* Initialize */
xvid_global(NULL, XVID_GBL_INIT, &xvid_gbl_init, NULL);
/* Create the encoder reference */
memset(&xvid_enc_create, 0, sizeof(xvid_enc_create));
xvid_enc_create.version = XVID_VERSION;
/* Store the desired frame size */
xvid_enc_create.width = x->xsize = avctx->width;
xvid_enc_create.height = x->ysize = avctx->height;
/* Xvid can determine the proper profile to use */
/* xvid_enc_create.profile = XVID_PROFILE_S_L3; */
/* We don't use zones */
xvid_enc_create.zones = NULL;
xvid_enc_create.num_zones = 0;
xvid_enc_create.num_threads = avctx->thread_count;
xvid_enc_create.plugins = plugins;
xvid_enc_create.num_plugins = 0;
/* Initialize Buffers */
x->twopassbuffer = NULL;
x->old_twopassbuffer = NULL;
x->twopassfile = NULL;
if( xvid_flags & CODEC_FLAG_PASS1 ) {
memset(&rc2pass1, 0, sizeof(struct xvid_ff_pass1));
rc2pass1.version = XVID_VERSION;
rc2pass1.context = x;
x->twopassbuffer = av_malloc(BUFFER_SIZE);
x->old_twopassbuffer = av_malloc(BUFFER_SIZE);
if( x->twopassbuffer == NULL || x->old_twopassbuffer == NULL ) {
av_log(avctx, AV_LOG_ERROR,
"Xvid: Cannot allocate 2-pass log buffers\n");
return -1;
}
x->twopassbuffer[0] = x->old_twopassbuffer[0] = 0;
plugins[xvid_enc_create.num_plugins].func = xvid_ff_2pass;
plugins[xvid_enc_create.num_plugins].param = &rc2pass1;
xvid_enc_create.num_plugins++;
} else if( xvid_flags & CODEC_FLAG_PASS2 ) {
memset(&rc2pass2, 0, sizeof(xvid_plugin_2pass2_t));
rc2pass2.version = XVID_VERSION;
rc2pass2.bitrate = avctx->bit_rate;
fd = ff_tempfile("xvidff.", &(x->twopassfile));
if( fd == -1 ) {
av_log(avctx, AV_LOG_ERROR,
"Xvid: Cannot write 2-pass pipe\n");
return -1;
}
if( avctx->stats_in == NULL ) {
av_log(avctx, AV_LOG_ERROR,
"Xvid: No 2-pass information loaded for second pass\n");
return -1;
}
if( strlen(avctx->stats_in) >
write(fd, avctx->stats_in, strlen(avctx->stats_in)) ) {
close(fd);
av_log(avctx, AV_LOG_ERROR,
"Xvid: Cannot write to 2-pass pipe\n");
return -1;
}
close(fd);
rc2pass2.filename = x->twopassfile;
plugins[xvid_enc_create.num_plugins].func = xvid_plugin_2pass2;
plugins[xvid_enc_create.num_plugins].param = &rc2pass2;
xvid_enc_create.num_plugins++;
} else if( !(xvid_flags & CODEC_FLAG_QSCALE) ) {
/* Single Pass Bitrate Control! */
memset(&single, 0, sizeof(xvid_plugin_single_t));
single.version = XVID_VERSION;
single.bitrate = avctx->bit_rate;
plugins[xvid_enc_create.num_plugins].func = xvid_plugin_single;
plugins[xvid_enc_create.num_plugins].param = &single;
xvid_enc_create.num_plugins++;
}
/* Luminance Masking */
if( 0.0 != avctx->lumi_masking ) {
plugins[xvid_enc_create.num_plugins].func = xvid_plugin_lumimasking;
plugins[xvid_enc_create.num_plugins].param = NULL;
xvid_enc_create.num_plugins++;
}
/* Frame Rate and Key Frames */
xvid_correct_framerate(avctx);
xvid_enc_create.fincr = avctx->time_base.num;
xvid_enc_create.fbase = avctx->time_base.den;
if( avctx->gop_size > 0 )
xvid_enc_create.max_key_interval = avctx->gop_size;
else
xvid_enc_create.max_key_interval = 240; /* Xvid's best default */
/* Quants */
if( xvid_flags & CODEC_FLAG_QSCALE ) x->qscale = 1;
else x->qscale = 0;
xvid_enc_create.min_quant[0] = avctx->qmin;
xvid_enc_create.min_quant[1] = avctx->qmin;
xvid_enc_create.min_quant[2] = avctx->qmin;
xvid_enc_create.max_quant[0] = avctx->qmax;
xvid_enc_create.max_quant[1] = avctx->qmax;
xvid_enc_create.max_quant[2] = avctx->qmax;
/* Quant Matrices */
x->intra_matrix = x->inter_matrix = NULL;
if( avctx->mpeg_quant )
x->vol_flags |= XVID_VOL_MPEGQUANT;
if( (avctx->intra_matrix || avctx->inter_matrix) ) {
x->vol_flags |= XVID_VOL_MPEGQUANT;
if( avctx->intra_matrix ) {
intra = avctx->intra_matrix;
x->intra_matrix = av_malloc(sizeof(unsigned char) * 64);
} else
intra = NULL;
if( avctx->inter_matrix ) {
inter = avctx->inter_matrix;
x->inter_matrix = av_malloc(sizeof(unsigned char) * 64);
} else
inter = NULL;
for( i = 0; i < 64; i++ ) {
if( intra )
x->intra_matrix[i] = (unsigned char)intra[i];
if( inter )
x->inter_matrix[i] = (unsigned char)inter[i];
}
}
/* Misc Settings */
xvid_enc_create.frame_drop_ratio = 0;
xvid_enc_create.global = 0;
if( xvid_flags & CODEC_FLAG_CLOSED_GOP )
xvid_enc_create.global |= XVID_GLOBAL_CLOSED_GOP;
/* Determines which codec mode we are operating in */
avctx->extradata = NULL;
avctx->extradata_size = 0;
if( xvid_flags & CODEC_FLAG_GLOBAL_HEADER ) {
/* In this case, we are claiming to be MPEG4 */
x->quicktime_format = 1;
avctx->codec_id = CODEC_ID_MPEG4;
} else {
/* We are claiming to be Xvid */
x->quicktime_format = 0;
if(!avctx->codec_tag)
avctx->codec_tag = AV_RL32("xvid");
}
/* Bframes */
xvid_enc_create.max_bframes = avctx->max_b_frames;
xvid_enc_create.bquant_offset = 100 * avctx->b_quant_offset;
xvid_enc_create.bquant_ratio = 100 * avctx->b_quant_factor;
if( avctx->max_b_frames > 0 && !x->quicktime_format ) xvid_enc_create.global |= XVID_GLOBAL_PACKED;
/* Create encoder context */
xerr = xvid_encore(NULL, XVID_ENC_CREATE, &xvid_enc_create, NULL);
if( xerr ) {
av_log(avctx, AV_LOG_ERROR, "Xvid: Could not create encoder reference\n");
return -1;
}
x->encoder_handle = xvid_enc_create.handle;
avctx->coded_frame = &x->encoded_picture;
return 0;
}
/**
* Encode a single frame.
*
* @param avctx AVCodecContext pointer to context
* @param frame Pointer to encoded frame buffer
* @param buf_size Size of encoded frame buffer
* @param data Pointer to AVFrame of unencoded frame
* @return Returns 0 on success, -1 on failure
*/
static int xvid_encode_frame(AVCodecContext *avctx,
unsigned char *frame, int buf_size, void *data) {
int xerr, i;
char *tmp;
struct xvid_context *x = avctx->priv_data;
AVFrame *picture = data;
AVFrame *p = &(x->encoded_picture);
xvid_enc_frame_t xvid_enc_frame;
xvid_enc_stats_t xvid_enc_stats;
/* Start setting up the frame */
memset(&xvid_enc_frame, 0, sizeof(xvid_enc_frame));
xvid_enc_frame.version = XVID_VERSION;
memset(&xvid_enc_stats, 0, sizeof(xvid_enc_stats));
xvid_enc_stats.version = XVID_VERSION;
*p = *picture;
/* Let Xvid know where to put the frame. */
xvid_enc_frame.bitstream = frame;
xvid_enc_frame.length = buf_size;
/* Initialize input image fields */
if( avctx->pix_fmt != PIX_FMT_YUV420P ) {
av_log(avctx, AV_LOG_ERROR, "Xvid: Color spaces other than 420p not supported\n");
return -1;
}
xvid_enc_frame.input.csp = XVID_CSP_PLANAR; /* YUV420P */
for( i = 0; i < 4; i++ ) {
xvid_enc_frame.input.plane[i] = picture->data[i];
xvid_enc_frame.input.stride[i] = picture->linesize[i];
}
/* Encoder Flags */
xvid_enc_frame.vop_flags = x->vop_flags;
xvid_enc_frame.vol_flags = x->vol_flags;
xvid_enc_frame.motion = x->me_flags;
xvid_enc_frame.type =
picture->pict_type == AV_PICTURE_TYPE_I ? XVID_TYPE_IVOP :
picture->pict_type == AV_PICTURE_TYPE_P ? XVID_TYPE_PVOP :
picture->pict_type == AV_PICTURE_TYPE_B ? XVID_TYPE_BVOP :
XVID_TYPE_AUTO;
/* Pixel aspect ratio setting */
if (avctx->sample_aspect_ratio.num < 0 || avctx->sample_aspect_ratio.num > 255 ||
avctx->sample_aspect_ratio.den < 0 || avctx->sample_aspect_ratio.den > 255) {
av_log(avctx, AV_LOG_ERROR, "Invalid pixel aspect ratio %i/%i\n",
avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den);
return -1;
}
xvid_enc_frame.par = XVID_PAR_EXT;
xvid_enc_frame.par_width = avctx->sample_aspect_ratio.num;
xvid_enc_frame.par_height = avctx->sample_aspect_ratio.den;
/* Quant Setting */
if( x->qscale ) xvid_enc_frame.quant = picture->quality / FF_QP2LAMBDA;
else xvid_enc_frame.quant = 0;
/* Matrices */
xvid_enc_frame.quant_intra_matrix = x->intra_matrix;
xvid_enc_frame.quant_inter_matrix = x->inter_matrix;
/* Encode */
xerr = xvid_encore(x->encoder_handle, XVID_ENC_ENCODE,
&xvid_enc_frame, &xvid_enc_stats);
/* Two-pass log buffer swapping */
avctx->stats_out = NULL;
if( x->twopassbuffer ) {
tmp = x->old_twopassbuffer;
x->old_twopassbuffer = x->twopassbuffer;
x->twopassbuffer = tmp;
x->twopassbuffer[0] = 0;
if( x->old_twopassbuffer[0] != 0 ) {
avctx->stats_out = x->old_twopassbuffer;
}
}
if( 0 <= xerr ) {
p->quality = xvid_enc_stats.quant * FF_QP2LAMBDA;
if( xvid_enc_stats.type == XVID_TYPE_PVOP )
p->pict_type = AV_PICTURE_TYPE_P;
else if( xvid_enc_stats.type == XVID_TYPE_BVOP )
p->pict_type = AV_PICTURE_TYPE_B;
else if( xvid_enc_stats.type == XVID_TYPE_SVOP )
p->pict_type = AV_PICTURE_TYPE_S;
else
p->pict_type = AV_PICTURE_TYPE_I;
if( xvid_enc_frame.out_flags & XVID_KEYFRAME ) {
p->key_frame = 1;
if( x->quicktime_format )
return xvid_strip_vol_header(avctx, frame,
xvid_enc_stats.hlength, xerr);
} else
p->key_frame = 0;
return xerr;
} else {
av_log(avctx, AV_LOG_ERROR, "Xvid: Encoding Error Occurred: %i\n", xerr);
return -1;
}
}
/**
* Destroy the private context for the encoder.
* All buffers are freed, and the Xvid encoder context is destroyed.
*
* @param avctx AVCodecContext pointer to context
* @return Returns 0, success guaranteed
*/
static av_cold int xvid_encode_close(AVCodecContext *avctx) {
struct xvid_context *x = avctx->priv_data;
xvid_encore(x->encoder_handle, XVID_ENC_DESTROY, NULL, NULL);
av_freep(&avctx->extradata);
if( x->twopassbuffer != NULL ) {
av_free(x->twopassbuffer);
av_free(x->old_twopassbuffer);
}
av_free(x->twopassfile);
av_free(x->intra_matrix);
av_free(x->inter_matrix);
return 0;
}
/**
* Routine to create a global VO/VOL header for MP4 container.
* What we do here is extract the header from the Xvid bitstream
* as it is encoded. We also strip the repeated headers from the
* bitstream when a global header is requested for MPEG-4 ISO
* compliance.
*
* @param avctx AVCodecContext pointer to context
* @param frame Pointer to encoded frame data
* @param header_len Length of header to search
* @param frame_len Length of encoded frame data
* @return Returns new length of frame data
*/
int xvid_strip_vol_header(AVCodecContext *avctx,
unsigned char *frame,
unsigned int header_len,
unsigned int frame_len) {
int vo_len = 0, i;
for( i = 0; i < header_len - 3; i++ ) {
if( frame[i] == 0x00 &&
frame[i+1] == 0x00 &&
frame[i+2] == 0x01 &&
frame[i+3] == 0xB6 ) {
vo_len = i;
break;
}
}
if( vo_len > 0 ) {
/* We need to store the header, so extract it */
if( avctx->extradata == NULL ) {
avctx->extradata = av_malloc(vo_len);
memcpy(avctx->extradata, frame, vo_len);
avctx->extradata_size = vo_len;
}
/* Less dangerous now, memmove properly copies the two
chunks of overlapping data */
memmove(frame, &(frame[vo_len]), frame_len - vo_len);
return frame_len - vo_len;
} else
return frame_len;
}
/**
* Routine to correct a possibly erroneous framerate being fed to us.
* Xvid currently chokes on framerates where the ticks per frame is
* extremely large. This function works to correct problems in this area
* by estimating a new framerate and taking the simpler fraction of
* the two presented.
*
* @param avctx Context that contains the framerate to correct.
*/
void xvid_correct_framerate(AVCodecContext *avctx) {
int frate, fbase;
int est_frate, est_fbase;
int gcd;
float est_fps, fps;
frate = avctx->time_base.den;
fbase = avctx->time_base.num;
gcd = av_gcd(frate, fbase);
if( gcd > 1 ) {
frate /= gcd;
fbase /= gcd;
}
if( frate <= 65000 && fbase <= 65000 ) {
avctx->time_base.den = frate;
avctx->time_base.num = fbase;
return;
}
fps = (float)frate / (float)fbase;
est_fps = roundf(fps * 1000.0) / 1000.0;
est_frate = (int)est_fps;
if( est_fps > (int)est_fps ) {
est_frate = (est_frate + 1) * 1000;
est_fbase = (int)roundf((float)est_frate / est_fps);
} else
est_fbase = 1;
gcd = av_gcd(est_frate, est_fbase);
if( gcd > 1 ) {
est_frate /= gcd;
est_fbase /= gcd;
}
if( fbase > est_fbase ) {
avctx->time_base.den = est_frate;
avctx->time_base.num = est_fbase;
av_log(avctx, AV_LOG_DEBUG,
"Xvid: framerate re-estimated: %.2f, %.3f%% correction\n",
est_fps, (((est_fps - fps)/fps) * 100.0));
} else {
avctx->time_base.den = frate;
avctx->time_base.num = fbase;
}
}
/*
* Xvid 2-Pass Kludge Section
*
* Xvid's default 2-pass doesn't allow us to create data as we need to, so
* this section spends time replacing the first pass plugin so we can write
* statistic information as libavcodec requests in. We have another kludge
* that allows us to pass data to the second pass in Xvid without a custom
* rate-control plugin.
*/
/**
* Initialize the two-pass plugin and context.
*
* @param param Input construction parameter structure
* @param handle Private context handle
* @return Returns XVID_ERR_xxxx on failure, or 0 on success.
*/
static int xvid_ff_2pass_create(xvid_plg_create_t * param,
void ** handle) {
struct xvid_ff_pass1 *x = (struct xvid_ff_pass1 *)param->param;
char *log = x->context->twopassbuffer;
/* Do a quick bounds check */
if( log == NULL )
return XVID_ERR_FAIL;
/* We use snprintf() */
/* This is because we can safely prevent a buffer overflow */
log[0] = 0;
snprintf(log, BUFFER_REMAINING(log),
"# ffmpeg 2-pass log file, using xvid codec\n");
snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),
"# Do not modify. libxvidcore version: %d.%d.%d\n\n",
XVID_VERSION_MAJOR(XVID_VERSION),
XVID_VERSION_MINOR(XVID_VERSION),
XVID_VERSION_PATCH(XVID_VERSION));
*handle = x->context;
return 0;
}
/**
* Destroy the two-pass plugin context.
*
* @param ref Context pointer for the plugin
* @param param Destrooy context
* @return Returns 0, success guaranteed
*/
static int xvid_ff_2pass_destroy(struct xvid_context *ref,
xvid_plg_destroy_t *param) {
/* Currently cannot think of anything to do on destruction */
/* Still, the framework should be here for reference/use */
if( ref->twopassbuffer != NULL )
ref->twopassbuffer[0] = 0;
return 0;
}
/**
* Enable fast encode mode during the first pass.
*
* @param ref Context pointer for the plugin
* @param param Frame data
* @return Returns 0, success guaranteed
*/
static int xvid_ff_2pass_before(struct xvid_context *ref,
xvid_plg_data_t *param) {
int motion_remove;
int motion_replacements;
int vop_remove;
/* Nothing to do here, result is changed too much */
if( param->zone && param->zone->mode == XVID_ZONE_QUANT )
return 0;
/* We can implement a 'turbo' first pass mode here */
param->quant = 2;
/* Init values */
motion_remove = ~XVID_ME_CHROMA_PVOP &
~XVID_ME_CHROMA_BVOP &
~XVID_ME_EXTSEARCH16 &
~XVID_ME_ADVANCEDDIAMOND16;
motion_replacements = XVID_ME_FAST_MODEINTERPOLATE |
XVID_ME_SKIP_DELTASEARCH |
XVID_ME_FASTREFINE16 |
XVID_ME_BFRAME_EARLYSTOP;
vop_remove = ~XVID_VOP_MODEDECISION_RD &
~XVID_VOP_FAST_MODEDECISION_RD &
~XVID_VOP_TRELLISQUANT &
~XVID_VOP_INTER4V &
~XVID_VOP_HQACPRED;
param->vol_flags &= ~XVID_VOL_GMC;
param->vop_flags &= vop_remove;
param->motion_flags &= motion_remove;
param->motion_flags |= motion_replacements;
return 0;
}
/**
* Capture statistic data and write it during first pass.
*
* @param ref Context pointer for the plugin
* @param param Statistic data
* @return Returns XVID_ERR_xxxx on failure, or 0 on success
*/
static int xvid_ff_2pass_after(struct xvid_context *ref,
xvid_plg_data_t *param) {
char *log = ref->twopassbuffer;
char *frame_types = " ipbs";
char frame_type;
/* Quick bounds check */
if( log == NULL )
return XVID_ERR_FAIL;
/* Convert the type given to us into a character */
if( param->type < 5 && param->type > 0 ) {
frame_type = frame_types[param->type];
} else {
return XVID_ERR_FAIL;
}
snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),
"%c %d %d %d %d %d %d\n",
frame_type, param->stats.quant, param->stats.kblks, param->stats.mblks,
param->stats.ublks, param->stats.length, param->stats.hlength);
return 0;
}
/**
* Dispatch function for our custom plugin.
* This handles the dispatch for the Xvid plugin. It passes data
* on to other functions for actual processing.
*
* @param ref Context pointer for the plugin
* @param cmd The task given for us to complete
* @param p1 First parameter (varies)
* @param p2 Second parameter (varies)
* @return Returns XVID_ERR_xxxx on failure, or 0 on success
*/
int xvid_ff_2pass(void *ref, int cmd, void *p1, void *p2) {
switch( cmd ) {
case XVID_PLG_INFO:
case XVID_PLG_FRAME:
return 0;
case XVID_PLG_BEFORE:
return xvid_ff_2pass_before(ref, p1);
case XVID_PLG_CREATE:
return xvid_ff_2pass_create(p1, p2);
case XVID_PLG_AFTER:
return xvid_ff_2pass_after(ref, p1);
case XVID_PLG_DESTROY:
return xvid_ff_2pass_destroy(ref, p1);
default:
return XVID_ERR_FAIL;
}
}
/**
* Xvid codec definition for libavcodec.
*/
AVCodec ff_libxvid_encoder = {
"libxvid",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_MPEG4,
sizeof(struct xvid_context),
xvid_encode_init,
xvid_encode_frame,
xvid_encode_close,
.pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
.long_name= NULL_IF_CONFIG_SMALL("libxvidcore MPEG-4 part 2"),
};
#endif /* CONFIG_LIBXVID_ENCODER */