mirror of https://git.ffmpeg.org/ffmpeg.git
185 lines
5.3 KiB
C
185 lines
5.3 KiB
C
/*
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* Raw Video Codec
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* Copyright (c) 2001 Fabrice Bellard.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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* @file raw.c
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* Raw Video Codec
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*/
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#include "avcodec.h"
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typedef struct RawVideoContext {
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unsigned char * buffer; /* block of memory for holding one frame */
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unsigned char * p; /* current position in buffer */
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int length; /* number of bytes in buffer */
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AVFrame pic; ///< AVCodecContext.coded_frame
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} RawVideoContext;
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typedef struct PixleFormatTag {
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int pix_fmt;
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unsigned int fourcc;
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} PixelFormatTag;
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const PixelFormatTag pixelFormatTags[] = {
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{ PIX_FMT_YUV420P, MKTAG('I', '4', '2', '0') }, /* Planar formats */
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{ PIX_FMT_YUV420P, MKTAG('I', 'Y', 'U', 'V') },
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{ PIX_FMT_YUV410P, MKTAG('Y', 'U', 'V', '9') },
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{ PIX_FMT_YUV411P, MKTAG('Y', '4', '1', 'B') },
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{ PIX_FMT_YUV422P, MKTAG('Y', '4', '2', 'B') },
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{ PIX_FMT_GRAY8, MKTAG('Y', '8', '0', '0') },
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{ PIX_FMT_GRAY8, MKTAG(' ', ' ', 'Y', '8') },
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{ PIX_FMT_YUV422, MKTAG('Y', '4', '2', '2') }, /* Packed formats */
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{ PIX_FMT_UYVY422, MKTAG('U', 'Y', 'V', 'Y') },
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{ PIX_FMT_GRAY8, MKTAG('G', 'R', 'E', 'Y') },
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{ -1, 0 },
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};
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static int findPixelFormat(unsigned int fourcc)
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{
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const PixelFormatTag * tags = pixelFormatTags;
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while (tags->pix_fmt >= 0) {
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if (tags->fourcc == fourcc)
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return tags->pix_fmt;
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tags++;
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}
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return PIX_FMT_YUV420P;
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}
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unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat fmt)
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{
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const PixelFormatTag * tags = pixelFormatTags;
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while (tags->pix_fmt >= 0) {
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if (tags->pix_fmt == fmt)
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return tags->fourcc;
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tags++;
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}
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return 0;
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}
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/* RAW Decoder Implementation */
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static int raw_init_decoder(AVCodecContext *avctx)
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{
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RawVideoContext *context = avctx->priv_data;
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if (avctx->codec_tag)
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avctx->pix_fmt = findPixelFormat(avctx->codec_tag);
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else if (avctx->bits_per_sample){
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switch(avctx->bits_per_sample){
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case 15: avctx->pix_fmt= PIX_FMT_RGB555; break;
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case 16: avctx->pix_fmt= PIX_FMT_RGB565; break;
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case 24: avctx->pix_fmt= PIX_FMT_BGR24 ; break;
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case 32: avctx->pix_fmt= PIX_FMT_RGBA32; break;
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}
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}
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context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
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context->buffer = av_malloc(context->length);
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context->p = context->buffer;
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context->pic.pict_type = FF_I_TYPE;
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context->pic.key_frame = 1;
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avctx->coded_frame= &context->pic;
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if (!context->buffer)
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return -1;
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return 0;
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}
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static int raw_decode(AVCodecContext *avctx,
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void *data, int *data_size,
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uint8_t *buf, int buf_size)
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{
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RawVideoContext *context = avctx->priv_data;
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int bytesNeeded;
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AVPicture * picture = (AVPicture *) data;
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/* Early out without copy if packet size == frame size */
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if (buf_size == context->length && context->p == context->buffer) {
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avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height);
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*data_size = sizeof(AVPicture);
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return buf_size;
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}
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bytesNeeded = context->length - (context->p - context->buffer);
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if (buf_size < bytesNeeded) {
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memcpy(context->p, buf, buf_size);
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context->p += buf_size;
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return buf_size;
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}
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memcpy(context->p, buf, bytesNeeded);
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context->p = context->buffer;
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avpicture_fill(picture, context->buffer, avctx->pix_fmt, avctx->width, avctx->height);
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*data_size = sizeof(AVPicture);
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return bytesNeeded;
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}
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static int raw_close_decoder(AVCodecContext *avctx)
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{
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RawVideoContext *context = avctx->priv_data;
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av_freep(&context->buffer);
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return 0;
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}
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/* RAW Encoder Implementation */
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static int raw_init_encoder(AVCodecContext *avctx)
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{
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avctx->coded_frame = (AVFrame *)avctx->priv_data;
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avctx->coded_frame->pict_type = FF_I_TYPE;
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avctx->coded_frame->key_frame = 1;
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if(!avctx->codec_tag)
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avctx->codec_tag = avcodec_pix_fmt_to_codec_tag(avctx->pix_fmt);
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return 0;
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}
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static int raw_encode(AVCodecContext *avctx,
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unsigned char *frame, int buf_size, void *data)
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{
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return avpicture_layout((AVPicture *)data, avctx->pix_fmt, avctx->width,
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avctx->height, frame, buf_size);
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}
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AVCodec rawvideo_encoder = {
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"rawvideo",
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CODEC_TYPE_VIDEO,
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CODEC_ID_RAWVIDEO,
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sizeof(AVFrame),
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raw_init_encoder,
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raw_encode,
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};
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AVCodec rawvideo_decoder = {
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"rawvideo",
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CODEC_TYPE_VIDEO,
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CODEC_ID_RAWVIDEO,
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sizeof(RawVideoContext),
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raw_init_decoder,
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NULL,
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raw_close_decoder,
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raw_decode,
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};
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