mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-06 08:08:58 +02:00
![Carl Eugen Hoyos](/assets/img/avatar_default.png)
The decoder also supports a12v, but removes the transparency layer since no samples with actual transparency are available for testing.
173 lines
5.4 KiB
C
173 lines
5.4 KiB
C
/*
|
|
* 012v 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 "internal.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
|
|
static av_cold int zero12v_decode_init(AVCodecContext *avctx)
|
|
{
|
|
avctx->pix_fmt = PIX_FMT_YUV422P16;
|
|
avctx->bits_per_raw_sample = 10;
|
|
|
|
avctx->coded_frame = avcodec_alloc_frame();
|
|
if (!avctx->coded_frame)
|
|
return AVERROR(ENOMEM);
|
|
|
|
if (avctx->codec_tag == MKTAG('a', '1', '2', 'v'))
|
|
av_log_ask_for_sample(avctx, "Samples with actual transparency needed\n");
|
|
|
|
avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
|
|
avctx->coded_frame->key_frame = 1;
|
|
return 0;
|
|
}
|
|
|
|
static int zero12v_decode_frame(AVCodecContext *avctx, void *data,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
int line = 0;
|
|
const int width = avctx->width;
|
|
AVFrame *pic = avctx->coded_frame;
|
|
uint16_t *y, *u, *v;
|
|
const uint8_t *line_end, *src = avpkt->data;
|
|
int stride = avctx->width * 8 / 3;
|
|
|
|
if (pic->data[0])
|
|
avctx->release_buffer(avctx, pic);
|
|
|
|
if (width == 1) {
|
|
av_log(avctx, AV_LOG_ERROR, "Width 1 not supported.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if (avpkt->size < avctx->height * stride) {
|
|
av_log(avctx, AV_LOG_ERROR, "Packet too small: %d instead of %d\n",
|
|
avpkt->size, avctx->height * stride);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
pic->reference = 0;
|
|
if (ff_get_buffer(avctx, pic) < 0)
|
|
return AVERROR_INVALIDDATA;;
|
|
|
|
y = (uint16_t *)pic->data[0];
|
|
u = (uint16_t *)pic->data[1];
|
|
v = (uint16_t *)pic->data[2];
|
|
line_end = avpkt->data + stride;
|
|
|
|
while (line++ < avctx->height) {
|
|
while (1) {
|
|
uint32_t t = AV_RL32(src);
|
|
src += 4;
|
|
*u++ = t << 6 & 0xFFC0;
|
|
*y++ = t >> 4 & 0xFFC0;
|
|
*v++ = t >> 14 & 0xFFC0;
|
|
|
|
if (src >= line_end - 1) {
|
|
*y = 0x80;
|
|
src++;
|
|
line_end += stride;
|
|
y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
|
|
u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
|
|
v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
|
|
break;
|
|
}
|
|
|
|
t = AV_RL32(src);
|
|
src += 4;
|
|
*y++ = t << 6 & 0xFFC0;
|
|
*u++ = t >> 4 & 0xFFC0;
|
|
*y++ = t >> 14 & 0xFFC0;
|
|
if (src >= line_end - 2) {
|
|
if (!(width & 1)) {
|
|
*y = 0x80;
|
|
src += 2;
|
|
}
|
|
line_end += stride;
|
|
y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
|
|
u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
|
|
v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
|
|
break;
|
|
}
|
|
|
|
t = AV_RL32(src);
|
|
src += 4;
|
|
*v++ = t << 6 & 0xFFC0;
|
|
*y++ = t >> 4 & 0xFFC0;
|
|
*u++ = t >> 14 & 0xFFC0;
|
|
|
|
if (src >= line_end - 1) {
|
|
*y = 0x80;
|
|
src++;
|
|
line_end += stride;
|
|
y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
|
|
u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
|
|
v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
|
|
break;
|
|
}
|
|
|
|
t = AV_RL32(src);
|
|
src += 4;
|
|
*y++ = t << 6 & 0xFFC0;
|
|
*v++ = t >> 4 & 0xFFC0;
|
|
*y++ = t >> 14 & 0xFFC0;
|
|
|
|
if (src >= line_end - 2) {
|
|
if (width & 1) {
|
|
*y = 0x80;
|
|
src += 2;
|
|
}
|
|
line_end += stride;
|
|
y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
|
|
u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
|
|
v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
*got_frame = 1;
|
|
*(AVFrame*)data= *avctx->coded_frame;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int zero12v_decode_close(AVCodecContext *avctx)
|
|
{
|
|
AVFrame *pic = avctx->coded_frame;
|
|
if (pic->data[0])
|
|
avctx->release_buffer(avctx, pic);
|
|
av_freep(&avctx->coded_frame);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_zero12v_decoder = {
|
|
.name = "012v",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_012V,
|
|
.init = zero12v_decode_init,
|
|
.close = zero12v_decode_close,
|
|
.decode = zero12v_decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
|
|
};
|