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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 */
- AVFrame pic; ///< AVCodecContext.coded_frame
- } 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;
-
- context->pic.pict_type= FF_I_TYPE;
- context->pic.key_frame= 1;
- avctx->coded_frame= &context->pic;
-
- 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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