mirror of
https://github.com/nyanmisaka/ffmpeg-rockchip.git
synced 2025-11-01 04:53:04 +08:00
141 lines
3.9 KiB
C
141 lines
3.9 KiB
C
/*
|
|
* PDV video format
|
|
*
|
|
* Copyright (c) 2023 Paul B Mahol
|
|
*
|
|
* 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 "zlib_wrapper.h"
|
|
|
|
#include <zlib.h>
|
|
|
|
typedef struct PDVContext {
|
|
AVFrame *previous_frame;
|
|
FFZStream zstream;
|
|
} PDVContext;
|
|
|
|
static av_cold int decode_init(AVCodecContext *avctx)
|
|
{
|
|
PDVContext *s = avctx->priv_data;
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
|
|
|
|
s->previous_frame = av_frame_alloc();
|
|
if (!s->previous_frame)
|
|
return AVERROR(ENOMEM);
|
|
|
|
return ff_inflate_init(&s->zstream, avctx);
|
|
}
|
|
|
|
static av_cold int decode_end(AVCodecContext *avctx)
|
|
{
|
|
PDVContext *s = avctx->priv_data;
|
|
|
|
av_frame_free(&s->previous_frame);
|
|
ff_inflate_end(&s->zstream);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
PDVContext *s = avctx->priv_data;
|
|
AVFrame *prev_frame = s->previous_frame;
|
|
z_stream *const zstream = &s->zstream.zstream;
|
|
uint8_t *dst, *prev = prev_frame->data[0];
|
|
int ret, zret;
|
|
|
|
if (avctx->skip_frame >= AVDISCARD_ALL ||
|
|
(avctx->skip_frame >= AVDISCARD_NONINTRA &&
|
|
!(avpkt->flags & AV_PKT_FLAG_KEY)))
|
|
return avpkt->size;
|
|
|
|
zret = inflateReset(zstream);
|
|
if (zret != Z_OK) {
|
|
av_log(avctx, AV_LOG_ERROR, "Could not reset inflate: %d.\n", zret);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
|
|
return ret;
|
|
|
|
zstream->next_in = avpkt->data;
|
|
zstream->avail_in = avpkt->size;
|
|
|
|
dst = frame->data[0];
|
|
for (int i = 0; i < avctx->height; i++) {
|
|
zstream->next_out = dst;
|
|
zstream->avail_out = (avctx->width + 7) >> 3;
|
|
|
|
zret = inflate(zstream, Z_SYNC_FLUSH);
|
|
if (zret != Z_OK && zret != Z_STREAM_END) {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"Inflate failed with return code: %d.\n", zret);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (prev && !(avpkt->flags & AV_PKT_FLAG_KEY)) {
|
|
for (int j = 0; j < (avctx->width + 7) >> 3; j++)
|
|
dst[j] ^= prev[j];
|
|
prev += prev_frame->linesize[0];
|
|
}
|
|
|
|
dst += frame->linesize[0];
|
|
}
|
|
|
|
if ((ret = av_frame_replace(s->previous_frame, frame)) < 0)
|
|
return ret;
|
|
|
|
if (avpkt->flags & AV_PKT_FLAG_KEY) {
|
|
frame->flags |= AV_FRAME_FLAG_KEY;
|
|
frame->pict_type = AV_PICTURE_TYPE_I;
|
|
} else {
|
|
frame->pict_type = AV_PICTURE_TYPE_P;
|
|
}
|
|
|
|
*got_frame = 1;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
static void decode_flush(AVCodecContext *avctx)
|
|
{
|
|
PDVContext *s = avctx->priv_data;
|
|
|
|
av_frame_unref(s->previous_frame);
|
|
}
|
|
|
|
const FFCodec ff_pdv_decoder = {
|
|
.p.name = "pdv",
|
|
CODEC_LONG_NAME("PDV (PlayDate Video)"),
|
|
.priv_data_size = sizeof(PDVContext),
|
|
.p.type = AVMEDIA_TYPE_VIDEO,
|
|
.p.id = AV_CODEC_ID_PDV,
|
|
.p.capabilities = AV_CODEC_CAP_DR1,
|
|
.caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM |
|
|
FF_CODEC_CAP_INIT_CLEANUP,
|
|
.init = decode_init,
|
|
.close = decode_end,
|
|
.flush = decode_flush,
|
|
FF_CODEC_DECODE_CB(decode_frame),
|
|
};
|