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ce992c6932
FFmpeg/libavcodec/utils.c
Fabrice Bellard ce992c6932 moved code to mem.c and allcodecs.c 
Originally committed as revision 689 to svn://svn.ffmpeg.org/ffmpeg/trunk
2002-06-11 13:45:17 +00:00

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/*
* 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
*/
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
void *av_mallocz(int size)
{
void *ptr;
ptr = av_malloc(size);
if (!ptr)
return NULL;
memset(ptr, 0, size);
return ptr;
}
/* 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;
}
int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
{
int ret;
avctx->codec = codec;
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 *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 *buf, int buf_size,
const AVPicture *pict)
{
int ret;
ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
avctx->frame_number++;
return ret;
}
/* decode a frame. return -1 if error, otherwise return the number of
bytes used. If no frame could be decompressed, *got_picture_ptr is
zero. Otherwise, it is non zero */
int avcodec_decode_video(AVCodecContext *avctx, AVPicture *picture,
int *got_picture_ptr,
UINT8 *buf, int buf_size)
{
int ret;
ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
buf, buf_size);
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 *samples,
int *frame_size_ptr,
UINT8 *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;
}
const char *pix_fmt_str[] = {
"??",
"yuv420p",
"yuv422",
"rgb24",
"bgr24",
"yuv422p",
"yuv444p",
};
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",
pix_fmt_str[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 / FRAME_RATE_BASE);
}
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:
abort();
}
if (bitrate != 0) {
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", %d kb/s", bitrate / 1000);
}
}
/* Picture field are filled with 'ptr' addresses */
void avpicture_fill(AVPicture *picture, UINT8 *ptr,
int pix_fmt, int width, int height)
{
int size;
size = width * height;
switch(pix_fmt) {
case PIX_FMT_YUV420P:
picture->data[0] = ptr;
picture->data[1] = picture->data[0] + size;
picture->data[2] = picture->data[1] + size / 4;
picture->linesize[0] = width;
picture->linesize[1] = width / 2;
picture->linesize[2] = width / 2;
break;
case PIX_FMT_YUV422P:
picture->data[0] = ptr;
picture->data[1] = picture->data[0] + size;
picture->data[2] = picture->data[1] + size / 2;
picture->linesize[0] = width;
picture->linesize[1] = width / 2;
picture->linesize[2] = width / 2;
break;
case PIX_FMT_YUV444P:
picture->data[0] = ptr;
picture->data[1] = picture->data[0] + size;
picture->data[2] = picture->data[1] + size;
picture->linesize[0] = width;
picture->linesize[1] = width;
picture->linesize[2] = width;
break;
case PIX_FMT_RGB24:
case PIX_FMT_BGR24:
picture->data[0] = ptr;
picture->data[1] = NULL;
picture->data[2] = NULL;
picture->linesize[0] = width * 3;
break;
case PIX_FMT_YUV422:
picture->data[0] = ptr;
picture->data[1] = NULL;
picture->data[2] = NULL;
picture->linesize[0] = width * 2;
break;
default:
picture->data[0] = NULL;
picture->data[1] = NULL;
picture->data[2] = NULL;
break;
}
}
int avpicture_get_size(int pix_fmt, int width, int height)
{
int size;
size = width * height;
switch(pix_fmt) {
case PIX_FMT_YUV420P:
size = (size * 3) / 2;
break;
case PIX_FMT_YUV422P:
size = (size * 2);
break;
case PIX_FMT_YUV444P:
size = (size * 3);
break;
case PIX_FMT_RGB24:
case PIX_FMT_BGR24:
size = (size * 3);
break;
case PIX_FMT_YUV422:
size = (size * 2);
break;
default:
size = -1;
break;
}
return size;
}
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_init();
}
/* this should be called after seeking and before trying to decode the next frame */
void avcodec_flush_buffers(AVCodecContext *avctx)
{
MpegEncContext *s = avctx->priv_data;
s->num_available_buffers=0;
}
static int raw_encode_init(AVCodecContext *s)
{
return 0;
}
static int raw_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
UINT8 *buf, int buf_size)
{
return -1;
}
static int raw_encode_frame(AVCodecContext *avctx,
unsigned char *frame, int buf_size, void *data)
{
return -1;
}
AVCodec rawvideo_codec = {
"rawvideo",
CODEC_TYPE_VIDEO,
CODEC_ID_RAWVIDEO,
0,
raw_encode_init,
raw_encode_frame,
NULL,
raw_decode_frame,
};
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