2007-07-09 18:26:11 +02:00
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/*
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* Raw Video Decoder
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* Copyright (c) 2001 Fabrice Bellard.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file rawdec.c
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* Raw Video Decoder
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*/
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#include "avcodec.h"
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#include "raw.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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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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static const PixelFormatTag pixelFormatBpsAVI[] = {
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2007-07-29 15:32:53 +02:00
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{ PIX_FMT_PAL8, 4 },
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2007-07-09 18:26:11 +02:00
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{ PIX_FMT_PAL8, 8 },
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{ PIX_FMT_RGB555, 15 },
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{ PIX_FMT_RGB555, 16 },
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{ PIX_FMT_BGR24, 24 },
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{ PIX_FMT_RGB32, 32 },
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{ -1, 0 },
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};
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static const PixelFormatTag pixelFormatBpsMOV[] = {
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/* FIXME fix swscaler to support those */
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/* http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/chapter_4_section_2.html */
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2008-02-28 17:08:52 +01:00
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{ PIX_FMT_PAL8, 4 },
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2007-07-09 18:26:11 +02:00
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{ PIX_FMT_PAL8, 8 },
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{ PIX_FMT_BGR555, 16 },
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{ PIX_FMT_RGB24, 24 },
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{ PIX_FMT_BGR32_1, 32 },
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{ -1, 0 },
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};
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static int findPixelFormat(const PixelFormatTag *tags, unsigned int fourcc)
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{
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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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2008-03-21 04:11:20 +01:00
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static av_cold int raw_init_decoder(AVCodecContext *avctx)
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2007-07-09 18:26:11 +02:00
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{
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RawVideoContext *context = avctx->priv_data;
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if (avctx->codec_tag == MKTAG('r','a','w',' '))
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avctx->pix_fmt = findPixelFormat(pixelFormatBpsMOV, avctx->bits_per_sample);
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else if (avctx->codec_tag)
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avctx->pix_fmt = findPixelFormat(ff_raw_pixelFormatTags, avctx->codec_tag);
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else if (avctx->bits_per_sample)
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avctx->pix_fmt = findPixelFormat(pixelFormatBpsAVI, avctx->bits_per_sample);
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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->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 void flip(AVCodecContext *avctx, AVPicture * picture){
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if(!avctx->codec_tag && avctx->bits_per_sample && picture->linesize[2]==0){
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picture->data[0] += picture->linesize[0] * (avctx->height-1);
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picture->linesize[0] *= -1;
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}
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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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2008-02-01 15:03:56 +01:00
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const uint8_t *buf, int buf_size)
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2007-07-09 18:26:11 +02:00
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{
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RawVideoContext *context = avctx->priv_data;
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AVFrame * frame = (AVFrame *) data;
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AVPicture * picture = (AVPicture *) data;
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frame->interlaced_frame = avctx->coded_frame->interlaced_frame;
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frame->top_field_first = avctx->coded_frame->top_field_first;
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2008-02-28 17:08:52 +01:00
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//4bpp raw in avi and mov (yes this is ugly ...)
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if(avctx->bits_per_sample == 4 && avctx->pix_fmt==PIX_FMT_PAL8 &&
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2008-02-28 17:11:56 +01:00
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(!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))){
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2007-07-29 15:32:53 +02:00
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int i;
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for(i=256*2; i+1 < context->length>>1; i++){
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context->buffer[2*i+0]= buf[i-256*2]>>4;
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context->buffer[2*i+1]= buf[i-256*2]&15;
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}
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buf= context->buffer + 256*4;
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buf_size= context->length - 256*4;
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}
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2007-07-09 18:26:11 +02:00
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if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0))
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return -1;
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avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height);
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if(avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length){
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frame->data[1]= context->buffer;
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}
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if (avctx->palctrl && avctx->palctrl->palette_changed) {
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memcpy(frame->data[1], avctx->palctrl->palette, AVPALETTE_SIZE);
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avctx->palctrl->palette_changed = 0;
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}
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flip(avctx, picture);
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if (avctx->codec_tag == MKTAG('Y', 'V', '1', '2'))
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{
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// swap fields
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unsigned char *tmp = picture->data[1];
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picture->data[1] = picture->data[2];
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picture->data[2] = tmp;
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}
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*data_size = sizeof(AVPicture);
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return buf_size;
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}
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2008-03-21 04:11:20 +01:00
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static av_cold int raw_close_decoder(AVCodecContext *avctx)
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2007-07-09 18:26:11 +02:00
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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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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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