Chiebot-Mirror
/
FFmpeg
mirror of https://github.com/FFmpeg/FFmpeg.git
8
0
Fork 0
Code Issues Projects Releases Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
2130 Commits
37 Branches
400 Tags
473 MiB
 
 
 
 
Tag: Branch: Tree: b534c7f92a
Branches Tags
${ item.name }
Create tag ${ searchTerm }
Create branch ${ searchTerm }
from 'b534c7f92a'
${ noResults }
FFmpeg/libavcodec/utils.c

712 lines
18 KiB
Raw Blame History

/*
* utils for libavcodec
* Copyright (c) 2001 Fabrice Bellard.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* @file utils.c
* utils.
*/
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
void *av_mallocz(unsigned int size)
{
void *ptr;
ptr = av_malloc(size);
if (!ptr)
return NULL;
memset(ptr, 0, size);
return ptr;
}
char *av_strdup(const char *s)
{
char *ptr;
int len;
len = strlen(s) + 1;
ptr = av_malloc(len);
if (!ptr)
return NULL;
memcpy(ptr, s, len);
return ptr;
}
/**
* realloc which does nothing if the block is large enough
*/
void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)
{
if(min_size < *size)
return ptr;
*size= min_size + 10*1024;
return av_realloc(ptr, *size);
}
/* allocation of static arrays - do not use for normal allocation */
static unsigned int last_static = 0;
static char*** array_static = NULL;
static const unsigned int grow_static = 64; // ^2
void *__av_mallocz_static(void** location, unsigned int size)
{
unsigned int l = (last_static + grow_static) & ~(grow_static - 1);
void *ptr = av_mallocz(size);
if (!ptr)
return NULL;
if (location)
{
if (l > last_static)
array_static = av_realloc(array_static, l);
array_static[last_static++] = (char**) location;
*location = ptr;
}
return ptr;
}
/* free all static arrays and reset pointers to 0 */
void av_free_static()
{
if (array_static)
{
unsigned i;
for (i = 0; i < last_static; i++)
{
av_free(*array_static[i]);
*array_static[i] = NULL;
}
av_free(array_static);
array_static = 0;
}
last_static = 0;
}
/* cannot call it directly because of 'void **' casting is not automatic */
void __av_freep(void **ptr)
{
av_free(*ptr);
*ptr = NULL;
}
/* encoder management */
AVCodec *first_avcodec;
void register_avcodec(AVCodec *format)
{
AVCodec **p;
p = &first_avcodec;
while (*p != NULL) p = &(*p)->next;
*p = format;
format->next = NULL;
}
typedef struct InternalBuffer{
int last_pic_num;
uint8_t *base[4];
uint8_t *data[4];
}InternalBuffer;
#define INTERNAL_BUFFER_SIZE 32
int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
int i;
const int width = s->width;
const int height= s->height;
InternalBuffer *buf;
assert(pic->data[0]==NULL);
assert(INTERNAL_BUFFER_SIZE > s->internal_buffer_count);
if(s->internal_buffer==NULL){
s->internal_buffer= av_mallocz(INTERNAL_BUFFER_SIZE*sizeof(InternalBuffer));
}
#if 0
s->internal_buffer= av_fast_realloc(
s->internal_buffer,
&s->internal_buffer_size,
sizeof(InternalBuffer)*FFMAX(99, s->internal_buffer_count+1)/*FIXME*/
);
#endif
buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
if(buf->base[0]){
pic->age= pic->coded_picture_number - buf->last_pic_num;
buf->last_pic_num= pic->coded_picture_number;
}else{
int align, h_chroma_shift, v_chroma_shift;
int w, h, pixel_size;
avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
switch(s->pix_fmt){
case PIX_FMT_YUV422:
pixel_size=2;
break;
case PIX_FMT_RGB24:
case PIX_FMT_BGR24:
pixel_size=3;
break;
case PIX_FMT_RGBA32:
pixel_size=4;
break;
default:
pixel_size=1;
}
if(s->codec_id==CODEC_ID_SVQ1) align=63;
else align=15;
w= (width +align)&~align;
h= (height+align)&~align;
if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
w+= EDGE_WIDTH*2;
h+= EDGE_WIDTH*2;
}
buf->last_pic_num= -256*256*256*64;
for(i=0; i<3; i++){
const int h_shift= i==0 ? 0 : h_chroma_shift;
const int v_shift= i==0 ? 0 : v_chroma_shift;
pic->linesize[i]= pixel_size*w>>h_shift;
buf->base[i]= av_mallocz((pic->linesize[i]*h>>v_shift)+16); //FIXME 16
if(buf->base[i]==NULL) return -1;
memset(buf->base[i], 128, pic->linesize[i]*h>>v_shift);
if(s->flags&CODEC_FLAG_EMU_EDGE)
buf->data[i] = buf->base[i];
else
buf->data[i] = buf->base[i] + (pic->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift);
}
pic->age= 256*256*256*64;
pic->type= FF_BUFFER_TYPE_INTERNAL;
}
for(i=0; i<4; i++){
pic->base[i]= buf->base[i];
pic->data[i]= buf->data[i];
}
s->internal_buffer_count++;
return 0;
}
void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
int i;
InternalBuffer *buf, *last, temp;
assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
buf= &((InternalBuffer*)s->internal_buffer)[i];
if(buf->data[0] == pic->data[0])
break;
}
assert(i < s->internal_buffer_count);
s->internal_buffer_count--;
last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
temp= *buf;
*buf= *last;
*last= temp;
for(i=0; i<3; i++){
pic->data[i]=NULL;
// pic->base[i]=NULL;
}
//printf("R%X\n", pic->opaque);
}
enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, enum PixelFormat * fmt){
return fmt[0];
}
void avcodec_get_context_defaults(AVCodecContext *s){
s->bit_rate= 800*1000;
s->bit_rate_tolerance= s->bit_rate*10;
s->qmin= 2;
s->qmax= 31;
s->mb_qmin= 2;
s->mb_qmax= 31;
s->rc_eq= "tex^qComp";
s->qcompress= 0.5;
s->max_qdiff= 3;
s->b_quant_factor=1.25;
s->b_quant_offset=1.25;
s->i_quant_factor=-0.8;
s->i_quant_offset=0.0;
s->error_concealment= 3;
s->error_resilience= 1;
s->workaround_bugs= FF_BUG_AUTODETECT;
s->frame_rate_base= 1;
s->frame_rate = 25;
s->gop_size= 50;
s->me_method= ME_EPZS;
s->get_buffer= avcodec_default_get_buffer;
s->release_buffer= avcodec_default_release_buffer;
s->get_format= avcodec_default_get_format;
s->me_subpel_quality=8;
s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;
}
/**
* allocates a AVCodecContext and set it to defaults.
* this can be deallocated by simply calling free()
*/
AVCodecContext *avcodec_alloc_context(void){
AVCodecContext *avctx= av_mallocz(sizeof(AVCodecContext));
if(avctx==NULL) return NULL;
avcodec_get_context_defaults(avctx);
return avctx;
}
/**
* allocates a AVPFrame and set it to defaults.
* this can be deallocated by simply calling free()
*/
AVFrame *avcodec_alloc_frame(void){
AVFrame *pic= av_mallocz(sizeof(AVFrame));
return pic;
}
int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
{
int ret;
avctx->codec = codec;
avctx->codec_id = codec->id;
avctx->frame_number = 0;
if (codec->priv_data_size > 0) {
avctx->priv_data = av_mallocz(codec->priv_data_size);
if (!avctx->priv_data)
return -ENOMEM;
} else {
avctx->priv_data = NULL;
}
ret = avctx->codec->init(avctx);
if (ret < 0) {
av_freep(&avctx->priv_data);
return ret;
}
return 0;
}
int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
const short *samples)
{
int ret;
ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
avctx->frame_number++;
return ret;
}
int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
const AVFrame *pict)
{
int ret;
ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
emms_c(); //needed to avoid a emms_c() call before every return;
avctx->frame_number++;
return ret;
}
/**
* decode a frame.
* @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
* because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
* @param buf_size the size of the buffer in bytes
* @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
* @return -1 if error, otherwise return the number of
* bytes used.
*/
int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
int *got_picture_ptr,
uint8_t *buf, int buf_size)
{
int ret;
ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
buf, buf_size);
emms_c(); //needed to avoid a emms_c() call before every return;
if (*got_picture_ptr)
avctx->frame_number++;
return ret;
}
/* decode an audio frame. return -1 if error, otherwise return the
*number of bytes used. If no frame could be decompressed,
*frame_size_ptr is zero. Otherwise, it is the decompressed frame
*size in BYTES. */
int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
int *frame_size_ptr,
uint8_t *buf, int buf_size)
{
int ret;
ret = avctx->codec->decode(avctx, samples, frame_size_ptr,
buf, buf_size);
avctx->frame_number++;
return ret;
}
int avcodec_close(AVCodecContext *avctx)
{
if (avctx->codec->close)
avctx->codec->close(avctx);
av_freep(&avctx->priv_data);
avctx->codec = NULL;
return 0;
}
AVCodec *avcodec_find_encoder(enum CodecID id)
{
AVCodec *p;
p = first_avcodec;
while (p) {
if (p->encode != NULL && p->id == id)
return p;
p = p->next;
}
return NULL;
}
AVCodec *avcodec_find_encoder_by_name(const char *name)
{
AVCodec *p;
p = first_avcodec;
while (p) {
if (p->encode != NULL && strcmp(name,p->name) == 0)
return p;
p = p->next;
}
return NULL;
}
AVCodec *avcodec_find_decoder(enum CodecID id)
{
AVCodec *p;
p = first_avcodec;
while (p) {
if (p->decode != NULL && p->id == id)
return p;
p = p->next;
}
return NULL;
}
AVCodec *avcodec_find_decoder_by_name(const char *name)
{
AVCodec *p;
p = first_avcodec;
while (p) {
if (p->decode != NULL && strcmp(name,p->name) == 0)
return p;
p = p->next;
}
return NULL;
}
AVCodec *avcodec_find(enum CodecID id)
{
AVCodec *p;
p = first_avcodec;
while (p) {
if (p->id == id)
return p;
p = p->next;
}
return NULL;
}
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
{
const char *codec_name;
AVCodec *p;
char buf1[32];
char channels_str[100];
int bitrate;
if (encode)
p = avcodec_find_encoder(enc->codec_id);
else
p = avcodec_find_decoder(enc->codec_id);
if (p) {
codec_name = p->name;
} else if (enc->codec_name[0] != '\0') {
codec_name = enc->codec_name;
} else {
/* output avi tags */
if (enc->codec_type == CODEC_TYPE_VIDEO) {
snprintf(buf1, sizeof(buf1), "%c%c%c%c",
enc->codec_tag & 0xff,
(enc->codec_tag >> 8) & 0xff,
(enc->codec_tag >> 16) & 0xff,
(enc->codec_tag >> 24) & 0xff);
} else {
snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
}
codec_name = buf1;
}
switch(enc->codec_type) {
case CODEC_TYPE_VIDEO:
snprintf(buf, buf_size,
"Video: %s%s",
codec_name, enc->flags & CODEC_FLAG_HQ ? " (hq)" : "");
if (enc->codec_id == CODEC_ID_RAWVIDEO) {
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", %s",
avcodec_get_pix_fmt_name(enc->pix_fmt));
}
if (enc->width) {
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", %dx%d, %0.2f fps",
enc->width, enc->height,
(float)enc->frame_rate / enc->frame_rate_base);
}
if (encode) {
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", q=%d-%d", enc->qmin, enc->qmax);
}
bitrate = enc->bit_rate;
break;
case CODEC_TYPE_AUDIO:
snprintf(buf, buf_size,
"Audio: %s",
codec_name);
switch (enc->channels) {
case 1:
strcpy(channels_str, "mono");
break;
case 2:
strcpy(channels_str, "stereo");
break;
case 6:
strcpy(channels_str, "5:1");
break;
default:
sprintf(channels_str, "%d channels", enc->channels);
break;
}
if (enc->sample_rate) {
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", %d Hz, %s",
enc->sample_rate,
channels_str);
}
/* for PCM codecs, compute bitrate directly */
switch(enc->codec_id) {
case CODEC_ID_PCM_S16LE:
case CODEC_ID_PCM_S16BE:
case CODEC_ID_PCM_U16LE:
case CODEC_ID_PCM_U16BE:
bitrate = enc->sample_rate * enc->channels * 16;
break;
case CODEC_ID_PCM_S8:
case CODEC_ID_PCM_U8:
case CODEC_ID_PCM_ALAW:
case CODEC_ID_PCM_MULAW:
bitrate = enc->sample_rate * enc->channels * 8;
break;
default:
bitrate = enc->bit_rate;
break;
}
break;
default:
av_abort();
}
if (encode) {
if (enc->flags & CODEC_FLAG_PASS1)
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", pass 1");
if (enc->flags & CODEC_FLAG_PASS2)
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", pass 2");
}
if (bitrate != 0) {
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", %d kb/s", bitrate / 1000);
}
}
unsigned avcodec_version( void )
{
return LIBAVCODEC_VERSION_INT;
}
unsigned avcodec_build( void )
{
return LIBAVCODEC_BUILD;
}
/* must be called before any other functions */
void avcodec_init(void)
{
static int inited = 0;
if (inited != 0)
return;
inited = 1;
dsputil_static_init();
}
/* this can be called after seeking and before trying to decode the next keyframe */
void avcodec_flush_buffers(AVCodecContext *avctx)
{
int i;
MpegEncContext *s = avctx->priv_data;
switch(avctx->codec_id){
case CODEC_ID_MPEG1VIDEO:
case CODEC_ID_H263:
case CODEC_ID_RV10:
// case CODEC_ID_MJPEG:
// case CODEC_ID_MJPEGB:
case CODEC_ID_MPEG4:
case CODEC_ID_MSMPEG4V1:
case CODEC_ID_MSMPEG4V2:
case CODEC_ID_MSMPEG4V3:
case CODEC_ID_WMV1:
case CODEC_ID_WMV2:
case CODEC_ID_H263P:
case CODEC_ID_H263I:
case CODEC_ID_SVQ1:
for(i=0; i<MAX_PICTURE_COUNT; i++){
if(s->picture[i].data[0] && ( s->picture[i].type == FF_BUFFER_TYPE_INTERNAL
|| s->picture[i].type == FF_BUFFER_TYPE_USER))
avctx->release_buffer(avctx, (AVFrame*)&s->picture[i]);
}
s->last_picture_ptr = s->next_picture_ptr = NULL;
break;
default:
//FIXME
break;
}
}
void avcodec_default_free_buffers(AVCodecContext *s){
int i, j;
if(s->internal_buffer==NULL) return;
for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
for(j=0; j<4; j++){
av_freep(&buf->base[j]);
buf->data[j]= NULL;
}
}
av_freep(&s->internal_buffer);
s->internal_buffer_count=0;
}
char av_get_pict_type_char(int pict_type){
switch(pict_type){
case I_TYPE: return 'I';
case P_TYPE: return 'P';
case B_TYPE: return 'B';
case S_TYPE: return 'S';
case SI_TYPE:return 'i';
case SP_TYPE:return 'p';
default: return '?';
}
}
int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
int exact=1, sign=0;
int64_t gcd, larger;
assert(den != 0);
if(den < 0){
den= -den;
nom= -nom;
}
if(nom < 0){
nom= -nom;
sign= 1;
}
for(;;){ //note is executed 1 or 2 times
gcd = ff_gcd(nom, den);
nom /= gcd;
den /= gcd;
larger= FFMAX(nom, den);
if(larger > max){
int64_t div= (larger + max - 1) / max;
nom = (nom + div/2)/div;
den = (den + div/2)/div;
exact=0;
}else
break;
}
if(sign) nom= -nom;
*dst_nom = nom;
*dst_den = den;
return exact;
}
int64_t av_rescale(int64_t a, int b, int c){
uint64_t h, l;
assert(c > 0);
assert(b >=0);
if(a<0) return -av_rescale(-a, b, c);
h= a>>32;
if(h==0) return a*b/c;
l= a&0xFFFFFFFF;
l *= b;
h *= b;
l += (h%c)<<32;
return ((h/c)<<32) + l/c;
}