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/*
* Raw Video Codec
* 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 raw.c
* Raw Video Codec
*/
#include "avcodec.h"
typedef struct PixleFormatTag {
int pix_fmt;
unsigned int fourcc;
} PixelFormatTag;
const PixelFormatTag pixelFormatTags[] = {
{ PIX_FMT_YUV422, MKTAG('Y', '4', '2', '2') },
{ PIX_FMT_YUV420P, MKTAG('I', '4', '2', '0') },
{ -1, 0 },
};
static int findPixelFormat(unsigned int fourcc)
{
const PixelFormatTag * tags = pixelFormatTags;
while (tags->pix_fmt >= 0) {
if (tags->fourcc == fourcc)
return tags->pix_fmt;
tags++;
}
return PIX_FMT_YUV420P;
}
typedef struct RawVideoContext {
unsigned char * buffer; /* block of memory for holding one frame */
unsigned char * p; /* current position in buffer */
int length; /* number of bytes in buffer */
} RawVideoContext;
static int raw_init(AVCodecContext *avctx)
{
RawVideoContext *context = avctx->priv_data;
if (avctx->codec_tag) {
avctx->pix_fmt = findPixelFormat(avctx->codec_tag);
}
context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
context->buffer = av_malloc(context->length);
context->p = context->buffer;
if (! context->buffer) {
return -1;
}
return 0;
}
static int raw_decode(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
{
RawVideoContext *context = avctx->priv_data;
int bytesNeeded;
AVPicture * picture = (AVPicture *) data;
/* Early out without copy if packet size == frame size */
if (buf_size == context->length && context->p == context->buffer) {
avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height);
*data_size = sizeof(AVPicture);
return buf_size;
}
bytesNeeded = context->length - (context->p - context->buffer);
if (buf_size < bytesNeeded) {
memcpy(context->p, buf, buf_size);
context->p += buf_size;
*data_size = 0;
return buf_size;
}
memcpy(context->p, buf, bytesNeeded);
context->p = context->buffer;
avpicture_fill(picture, context->buffer, avctx->pix_fmt, avctx->width, avctx->height);
*data_size = sizeof(AVPicture);
return bytesNeeded;
}
static int raw_close(AVCodecContext *avctx)
{
RawVideoContext *context = avctx->priv_data;
av_freep(& context->buffer);
return 0;
}
static int raw_encode(AVCodecContext *avctx,
unsigned char *frame, int buf_size, void *data)
{
AVPicture * picture = data;
unsigned char *src;
unsigned char *dest = frame;
int i, j;
int w = avctx->width;
int h = avctx->height;
int size = avpicture_get_size(avctx->pix_fmt, w, h);
if (size > buf_size) {
return -1;
}
switch(avctx->pix_fmt) {
case PIX_FMT_YUV420P:
for(i=0;i<3;i++) {
if (i == 1) {
w >>= 1;
h >>= 1;
}
src = picture->data[i];
for(j=0;j<h;j++) {
memcpy(dest, src, w);
dest += w;
src += picture->linesize[i];
}
}
break;
case PIX_FMT_YUV422P:
for(i=0;i<3;i++) {
if (i == 1) {
w >>= 1;
}
src = picture->data[i];
for(j=0;j<h;j++) {
memcpy(dest, src, w);
dest += w;
src += picture->linesize[i];
}
}
break;
case PIX_FMT_YUV444P:
for(i=0;i<3;i++) {
src = picture->data[i];
for(j=0;j<h;j++) {
memcpy(dest, src, w);
dest += w;
src += picture->linesize[i];
}
}
break;
case PIX_FMT_YUV422:
src = picture->data[0];
for(j=0;j<h;j++) {
memcpy(dest, src, w * 2);
dest += w * 2;
src += picture->linesize[0];
}
break;
case PIX_FMT_RGB24:
case PIX_FMT_BGR24:
src = picture->data[0];
for(j=0;j<h;j++) {
memcpy(dest, src, w * 3);
dest += w * 3;
src += picture->linesize[0];
}
break;
default:
return -1;
}
return size;
}
AVCodec rawvideo_codec = {
"rawvideo",
CODEC_TYPE_VIDEO,
CODEC_ID_RAWVIDEO,
sizeof(RawVideoContext),
raw_init,
raw_encode,
raw_close,
raw_decode,
};
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