/* * AVID Meridien decoder * * Copyright (c) 2012 Carl Eugen Hoyos * * This file is part of FFmpeg. * * FFmpeg 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 2.1 of the License, or (at your option) any later version. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "avcodec.h"#include "codec_internal.h"#include "decode.h"#include "libavutil/intreadwrite.h" static av_cold int avui_decode_init(AVCodecContext *avctx){    avctx->pix_fmt = AV_PIX_FMT_YUVA422P;    return 0;} static int avui_decode_frame(AVCodecContext *avctx, AVFrame *pic,                             int *got_frame, AVPacket *avpkt){    int ret;    const uint8_t *src = avpkt->data, *extradata = avctx->extradata;    const uint8_t *srca;    uint8_t *y, *u, *v, *a;    int transparent, interlaced = 1, skip, opaque_length, i, j, k;    uint32_t extradata_size = avctx->extradata_size;     while (extradata_size >= 24) {        uint32_t atom_size = AV_RB32(extradata);        if (!memcmp(&extradata[4], "APRGAPRG0001", 12)) {            interlaced = extradata[19] != 1;            break;        }        if (atom_size && atom_size <= extradata_size) {            extradata      += atom_size;            extradata_size -= atom_size;        } else {            break;        }    }    if (avctx->height == 486) {        skip = 10;    } else {        skip = 16;    }    opaque_length = 2 * avctx->width * (avctx->height + skip) + 4 * interlaced;    if (avpkt->size < opaque_length) {        av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");        return AVERROR(EINVAL);    }    transparent = avctx->bits_per_coded_sample == 32 &&                  avpkt->size >= opaque_length * 2 + 4;    srca = src + opaque_length + 5;     if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)        return ret;     if (!interlaced) {        src  += avctx->width * skip;        srca += avctx->width * skip;    }     for (i = 0; i < interlaced + 1; i++) {        src  += avctx->width * skip;        srca += avctx->width * skip;        if (interlaced && avctx->height == 486) {            y = pic->data[0] + (1 - i) * pic->linesize[0];            u = pic->data[1] + (1 - i) * pic->linesize[1];            v = pic->data[2] + (1 - i) * pic->linesize[2];            a = pic->data[3] + (1 - i) * pic->linesize[3];        } else {            y = pic->data[0] + i * pic->linesize[0];            u = pic->data[1] + i * pic->linesize[1];            v = pic->data[2] + i * pic->linesize[2];            a = pic->data[3] + i * pic->linesize[3];        }         for (j = 0; j < avctx->height >> interlaced; j++) {            for (k = 0; k < avctx->width >> 1; k++) {                u[    k    ] = *src++;                y[2 * k    ] = *src++;                a[2 * k    ] = 0xFF - (transparent ? *srca++ : 0);                srca++;                v[    k    ] = *src++;                y[2 * k + 1] = *src++;                a[2 * k + 1] = 0xFF - (transparent ? *srca++ : 0);                srca++;            }             y += (interlaced + 1) * pic->linesize[0];            u += (interlaced + 1) * pic->linesize[1];            v += (interlaced + 1) * pic->linesize[2];            a += (interlaced + 1) * pic->linesize[3];        }        src  += 4;        srca += 4;    }    *got_frame       = 1;     return avpkt->size;} const FFCodec ff_avui_decoder = {    .p.name         = "avui",    CODEC_LONG_NAME("Avid Meridien Uncompressed"),    .p.type         = AVMEDIA_TYPE_VIDEO,    .p.id           = AV_CODEC_ID_AVUI,    .p.capabilities = AV_CODEC_CAP_DR1,    .init         = avui_decode_init,    FF_CODEC_DECODE_CB(avui_decode_frame),};