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ffmpeg / libavcodec / rawdec.c @ 611e7bc4

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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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    { PIX_FMT_PAL8,    4 },
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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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    { 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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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 == 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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                            uint8_t *buf, int buf_size)
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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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    //4bpp raw in avi (yes this is ugly ...)
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    if(avctx->bits_per_sample == 4 && avctx->pix_fmt==PIX_FMT_PAL8 && !avctx->codec_tag){
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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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    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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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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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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};