mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-26 17:32:06 +00:00
48286d4d98
It reduces typing: Before this patch, there were 105 codecs whose long_name-definition exceeded the 80 char line length limit. Now there are only nine of them. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
195 lines
5.3 KiB
C
195 lines
5.3 KiB
C
/*
|
|
* Copyright (c) 2021 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 "libavutil/common.h"
|
|
#include "avcodec.h"
|
|
#include "bytestream.h"
|
|
#include "codec_internal.h"
|
|
#include "decode.h"
|
|
|
|
typedef struct SimbiosisIMXContext {
|
|
AVFrame *frame;
|
|
uint32_t pal[256];
|
|
uint8_t history[32768];
|
|
int pos;
|
|
} SimbiosisIMXContext;
|
|
|
|
static av_cold int imx_decode_init(AVCodecContext *avctx)
|
|
{
|
|
SimbiosisIMXContext *imx = avctx->priv_data;
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_PAL8;
|
|
avctx->width = 320;
|
|
avctx->height = 160;
|
|
|
|
imx->frame = av_frame_alloc();
|
|
if (!imx->frame)
|
|
return AVERROR(ENOMEM);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int imx_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
SimbiosisIMXContext *imx = avctx->priv_data;
|
|
int ret, x, y;
|
|
AVFrame *frame = imx->frame;
|
|
GetByteContext gb;
|
|
|
|
if ((ret = ff_reget_buffer(avctx, frame, 0)) < 0)
|
|
return ret;
|
|
|
|
if (ff_copy_palette(imx->pal, avpkt, avctx)) {
|
|
frame->palette_has_changed = 1;
|
|
frame->key_frame = 1;
|
|
} else {
|
|
frame->key_frame = 0;
|
|
frame->palette_has_changed = 0;
|
|
}
|
|
|
|
bytestream2_init(&gb, avpkt->data, avpkt->size);
|
|
|
|
memcpy(frame->data[1], imx->pal, AVPALETTE_SIZE);
|
|
|
|
x = 0, y = 0;
|
|
while (bytestream2_get_bytes_left(&gb) > 0 &&
|
|
x < 320 && y < 160) {
|
|
int b = bytestream2_get_byte(&gb);
|
|
int len = b & 0x3f;
|
|
int op = b >> 6;
|
|
int fill;
|
|
|
|
switch (op) {
|
|
case 3:
|
|
len = len * 64 + bytestream2_get_byte(&gb);
|
|
case 0:
|
|
while (len > 0) {
|
|
x++;
|
|
len--;
|
|
if (x >= 320) {
|
|
x = 0;
|
|
y++;
|
|
}
|
|
if (y >= 160)
|
|
break;
|
|
}
|
|
|
|
frame->key_frame = 0;
|
|
break;
|
|
case 1:
|
|
if (len == 0) {
|
|
int offset = bytestream2_get_le16(&gb);
|
|
|
|
if (offset < 0 || offset >= 32768)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
len = bytestream2_get_byte(&gb);
|
|
while (len > 0 && offset < 32768) {
|
|
frame->data[0][x + y * frame->linesize[0]] = imx->history[offset++];
|
|
x++;
|
|
len--;
|
|
if (x >= 320) {
|
|
x = 0;
|
|
y++;
|
|
}
|
|
if (y >= 160)
|
|
break;
|
|
}
|
|
|
|
frame->key_frame = 0;
|
|
} else {
|
|
while (len > 0) {
|
|
fill = bytestream2_get_byte(&gb);
|
|
frame->data[0][x + y * frame->linesize[0]] = fill;
|
|
if (imx->pos < 32768)
|
|
imx->history[imx->pos++] = fill;
|
|
x++;
|
|
len--;
|
|
if (x >= 320) {
|
|
x = 0;
|
|
y++;
|
|
}
|
|
if (y >= 160)
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case 2:
|
|
fill = bytestream2_get_byte(&gb);
|
|
|
|
while (len > 0) {
|
|
frame->data[0][x + y * frame->linesize[0]] = fill;
|
|
x++;
|
|
len--;
|
|
if (x >= 320) {
|
|
x = 0;
|
|
y++;
|
|
}
|
|
if (y >= 160)
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
frame->pict_type = frame->key_frame ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
|
|
|
|
if ((ret = av_frame_ref(rframe, frame)) < 0)
|
|
return ret;
|
|
|
|
*got_frame = 1;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
static void imx_decode_flush(AVCodecContext *avctx)
|
|
{
|
|
SimbiosisIMXContext *imx = avctx->priv_data;
|
|
|
|
av_frame_unref(imx->frame);
|
|
imx->pos = 0;
|
|
memset(imx->pal, 0, sizeof(imx->pal));
|
|
memset(imx->history, 0, sizeof(imx->history));
|
|
}
|
|
|
|
static int imx_decode_close(AVCodecContext *avctx)
|
|
{
|
|
SimbiosisIMXContext *imx = avctx->priv_data;
|
|
|
|
av_frame_free(&imx->frame);
|
|
|
|
return 0;
|
|
}
|
|
|
|
const FFCodec ff_simbiosis_imx_decoder = {
|
|
.p.name = "simbiosis_imx",
|
|
CODEC_LONG_NAME("Simbiosis Interactive IMX Video"),
|
|
.p.type = AVMEDIA_TYPE_VIDEO,
|
|
.p.id = AV_CODEC_ID_SIMBIOSIS_IMX,
|
|
.priv_data_size = sizeof(SimbiosisIMXContext),
|
|
.init = imx_decode_init,
|
|
FF_CODEC_DECODE_CB(imx_decode_frame),
|
|
.close = imx_decode_close,
|
|
.flush = imx_decode_flush,
|
|
.p.capabilities = AV_CODEC_CAP_DR1,
|
|
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
|
|
};
|