mirror of
https://git.ffmpeg.org/ffmpeg.git
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131 lines
4.2 KiB
C
131 lines
4.2 KiB
C
/*
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* AVID Meridien decoder
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*
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* Copyright (c) 2012 Carl Eugen Hoyos
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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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#include "avcodec.h"
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#include "internal.h"
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#include "libavutil/intreadwrite.h"
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static av_cold int avui_decode_init(AVCodecContext *avctx)
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{
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avctx->pix_fmt = AV_PIX_FMT_YUVA422P;
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return 0;
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}
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static int avui_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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int ret;
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AVFrame *pic = data;
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const uint8_t *src = avpkt->data, *extradata = avctx->extradata;
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const uint8_t *srca;
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uint8_t *y, *u, *v, *a;
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int transparent, interlaced = 1, skip, opaque_length, i, j, k;
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uint32_t extradata_size = avctx->extradata_size;
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while (extradata_size >= 24) {
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uint32_t atom_size = AV_RB32(extradata);
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if (!memcmp(&extradata[4], "APRGAPRG0001", 12)) {
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interlaced = extradata[19] != 1;
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break;
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}
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if (atom_size && atom_size <= extradata_size) {
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extradata += atom_size;
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extradata_size -= atom_size;
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} else {
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break;
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}
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}
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if (avctx->height == 486) {
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skip = 10;
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} else {
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skip = 16;
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}
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opaque_length = 2 * avctx->width * (avctx->height + skip) + 4 * interlaced;
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if (avpkt->size < opaque_length) {
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av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
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return AVERROR(EINVAL);
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}
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transparent = avctx->bits_per_coded_sample == 32 &&
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avpkt->size >= opaque_length * 2 + 4;
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srca = src + opaque_length + 5;
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if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
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return ret;
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pic->key_frame = 1;
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pic->pict_type = AV_PICTURE_TYPE_I;
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if (!interlaced) {
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src += avctx->width * skip;
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srca += avctx->width * skip;
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}
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for (i = 0; i < interlaced + 1; i++) {
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src += avctx->width * skip;
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srca += avctx->width * skip;
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if (interlaced && avctx->height == 486) {
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y = pic->data[0] + (1 - i) * pic->linesize[0];
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u = pic->data[1] + (1 - i) * pic->linesize[1];
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v = pic->data[2] + (1 - i) * pic->linesize[2];
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a = pic->data[3] + (1 - i) * pic->linesize[3];
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} else {
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y = pic->data[0] + i * pic->linesize[0];
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u = pic->data[1] + i * pic->linesize[1];
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v = pic->data[2] + i * pic->linesize[2];
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a = pic->data[3] + i * pic->linesize[3];
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}
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for (j = 0; j < avctx->height >> interlaced; j++) {
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for (k = 0; k < avctx->width >> 1; k++) {
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u[ k ] = *src++;
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y[2 * k ] = *src++;
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a[2 * k ] = 0xFF - (transparent ? *srca++ : 0);
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srca++;
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v[ k ] = *src++;
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y[2 * k + 1] = *src++;
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a[2 * k + 1] = 0xFF - (transparent ? *srca++ : 0);
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srca++;
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}
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y += (interlaced + 1) * pic->linesize[0];
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u += (interlaced + 1) * pic->linesize[1];
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v += (interlaced + 1) * pic->linesize[2];
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a += (interlaced + 1) * pic->linesize[3];
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}
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src += 4;
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srca += 4;
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}
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*got_frame = 1;
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return avpkt->size;
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}
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AVCodec ff_avui_decoder = {
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.name = "avui",
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.long_name = NULL_IF_CONFIG_SMALL("Avid Meridien Uncompressed"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_AVUI,
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.init = avui_decode_init,
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.decode = avui_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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};
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