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/*
* 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 "libavutil/intreadwrite.h"
static av_cold int avui_decode_init(AVCodecContext *avctx)
{
avctx->pix_fmt = PIX_FMT_YUVA422P;
avctx->coded_frame = avcodec_alloc_frame();
if (!avctx->coded_frame) {
av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
return AVERROR(ENOMEM);
}
return 0;
}
static int avui_decode_frame(AVCodecContext *avctx, void *data,
int *data_size, AVPacket *avpkt)
{
AVFrame *pic = avctx->coded_frame;
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;
if (pic->data[0])
avctx->release_buffer(avctx, pic);
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;
pic->reference = 0;
if (avctx->get_buffer(avctx, pic) < 0) {
av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
return AVERROR(ENOMEM);
}
pic->key_frame = 1;
pic->pict_type = AV_PICTURE_TYPE_I;
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;
}
*data_size = sizeof(AVFrame);
*(AVFrame *)data = *pic;
return avpkt->size;
}
static av_cold int avui_decode_close(AVCodecContext *avctx)
{
if (avctx->coded_frame->data[0])
avctx->release_buffer(avctx, avctx->coded_frame);
av_freep(&avctx->coded_frame);
return 0;
}
AVCodec ff_avui_decoder = {
.name = "avui",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_AVUI,
.init = avui_decode_init,
.decode = avui_decode_frame,
.close = avui_decode_close,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("AVID Meridien"),
};
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