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ffmpeg / libavcodec / rawdec.c @ de51f22d

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1 3a763f0f Aurelien Jacobs
/*
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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
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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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#include "libavutil/intreadwrite.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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    int flip;
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    AVFrame pic;             ///< AVCodecContext.coded_frame
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} RawVideoContext;
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static const PixelFormatTag pix_fmt_bps_avi[] = {
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    { PIX_FMT_PAL8,    4 },
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    { PIX_FMT_PAL8,    8 },
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    { PIX_FMT_RGB444, 12 },
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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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    { PIX_FMT_NONE, 0 },
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};
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static const PixelFormatTag pix_fmt_bps_mov[] = {
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    { PIX_FMT_MONOWHITE, 1 },
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    { PIX_FMT_PAL8,      2 },
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    { PIX_FMT_PAL8,      4 },
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    { PIX_FMT_PAL8,      8 },
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    // FIXME swscale does not support 16 bit in .mov, sample 16bit.mov
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    // http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html
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    { PIX_FMT_RGB555BE, 16 },
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    { PIX_FMT_RGB24,    24 },
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    { PIX_FMT_ARGB,     32 },
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    { PIX_FMT_NONE, 0 },
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};
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static enum PixelFormat find_pix_fmt(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 av_cold 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 = find_pix_fmt(pix_fmt_bps_mov, avctx->bits_per_coded_sample);
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    else if (avctx->codec_tag)
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        avctx->pix_fmt = find_pix_fmt(ff_raw_pix_fmt_tags, avctx->codec_tag);
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    else if (avctx->bits_per_coded_sample)
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        avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_avi, avctx->bits_per_coded_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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    if((avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) ||
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       avctx->codec_tag == MKTAG( 3 ,  0 ,  0 ,  0 ))
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        context->flip=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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    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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static int raw_decode(AVCodecContext *avctx,
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                            void *data, int *data_size,
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                            AVPacket *avpkt)
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{
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    const uint8_t *buf = avpkt->data;
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    int buf_size = avpkt->size;
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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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    //2bpp and 4bpp raw in avi and mov (yes this is ugly ...)
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    if((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) &&
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       avctx->pix_fmt==PIX_FMT_PAL8 &&
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       (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))){
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        int i;
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        uint8_t *dst = context->buffer + 256*4;
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        buf_size = context->length - 256*4;
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        if (avctx->bits_per_coded_sample == 4){
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            for(i=0; 2*i+1 < buf_size; i++){
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                dst[2*i+0]= buf[i]>>4;
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                dst[2*i+1]= buf[i]&15;
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            }
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        } else
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            for(i=0; 4*i+3 < buf_size; i++){
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                dst[4*i+0]= buf[i]>>6;
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                dst[4*i+1]= buf[i]>>4&3;
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                dst[4*i+2]= buf[i]>>2&3;
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                dst[4*i+3]= buf[i]   &3;
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            }
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        buf= dst;
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    }
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    if(avctx->codec_tag == MKTAG('A', 'V', '1', 'x') ||
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       avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
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        buf += buf_size - context->length;
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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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    if(avctx->pix_fmt==PIX_FMT_BGR24 && ((frame->linesize[0]+3)&~3)*avctx->height <= buf_size)
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        frame->linesize[0] = (frame->linesize[0]+3)&~3;
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    if(context->flip)
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        flip(avctx, picture);
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    if (   avctx->codec_tag == MKTAG('Y', 'V', '1', '2')
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        || avctx->codec_tag == MKTAG('Y', 'V', 'U', '9'))
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        FFSWAP(uint8_t *, picture->data[1], picture->data[2]);
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    if(avctx->codec_tag == AV_RL32("yuv2") &&
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       avctx->pix_fmt   == PIX_FMT_YUYV422) {
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        int x, y;
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        uint8_t *line = picture->data[0];
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        for(y = 0; y < avctx->height; y++) {
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            for(x = 0; x < avctx->width; x++)
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                line[2*x + 1] ^= 0x80;
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            line += picture->linesize[0];
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        }
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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 av_cold 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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    AVMEDIA_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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    .long_name = NULL_IF_CONFIG_SMALL("raw video"),
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};