mirror of
https://github.com/pineappleEA/pineapple-src.git
synced 2024-12-05 09:58:25 -05:00
234 lines
7.7 KiB
C
Executable File
234 lines
7.7 KiB
C
Executable File
/*
|
|
* CPiA video decoder.
|
|
* Copyright (c) 2010 Hans de Goede <hdegoede@redhat.com>
|
|
*
|
|
* This decoder is based on the LGPL code available at
|
|
* https://v4l4j.googlecode.com/svn/v4l4j/trunk/libvideo/libv4lconvert/cpia1.c
|
|
*
|
|
* 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 "get_bits.h"
|
|
#include "internal.h"
|
|
|
|
|
|
#define FRAME_HEADER_SIZE 64
|
|
#define MAGIC_0 0x19 /**< First header byte */
|
|
#define MAGIC_1 0x68 /**< Second header byte */
|
|
#define SUBSAMPLE_420 0
|
|
#define SUBSAMPLE_422 1
|
|
#define YUVORDER_YUYV 0
|
|
#define YUVORDER_UYVY 1
|
|
#define NOT_COMPRESSED 0
|
|
#define COMPRESSED 1
|
|
#define NO_DECIMATION 0
|
|
#define DECIMATION_ENAB 1
|
|
#define EOL 0xfd /**< End Of Line marker */
|
|
#define EOI 0xff /**< End Of Image marker */
|
|
|
|
|
|
typedef struct {
|
|
AVFrame *frame;
|
|
} CpiaContext;
|
|
|
|
|
|
static int cpia_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *got_frame, AVPacket* avpkt)
|
|
{
|
|
CpiaContext* const cpia = avctx->priv_data;
|
|
int i,j,ret;
|
|
|
|
uint8_t* const header = avpkt->data;
|
|
uint8_t* src;
|
|
int src_size;
|
|
uint16_t linelength;
|
|
uint8_t skip;
|
|
|
|
AVFrame *frame = cpia->frame;
|
|
uint8_t *y, *u, *v, *y_end, *u_end, *v_end;
|
|
|
|
// Check header
|
|
if ( avpkt->size < FRAME_HEADER_SIZE + avctx->height * 3
|
|
|| header[0] != MAGIC_0 || header[1] != MAGIC_1
|
|
|| (header[17] != SUBSAMPLE_420 && header[17] != SUBSAMPLE_422)
|
|
|| (header[18] != YUVORDER_YUYV && header[18] != YUVORDER_UYVY)
|
|
|| (header[28] != NOT_COMPRESSED && header[28] != COMPRESSED)
|
|
|| (header[29] != NO_DECIMATION && header[29] != DECIMATION_ENAB)
|
|
) {
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid header!\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
// currently unsupported properties
|
|
if (header[17] == SUBSAMPLE_422) {
|
|
avpriv_report_missing_feature(avctx, "4:2:2 subsampling");
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
if (header[18] == YUVORDER_UYVY) {
|
|
avpriv_report_missing_feature(avctx, "YUV byte order UYVY");
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
if (header[29] == DECIMATION_ENAB) {
|
|
avpriv_report_missing_feature(avctx, "Decimation");
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
|
|
src = header + FRAME_HEADER_SIZE;
|
|
src_size = avpkt->size - FRAME_HEADER_SIZE;
|
|
|
|
if (header[28] == NOT_COMPRESSED) {
|
|
frame->pict_type = AV_PICTURE_TYPE_I;
|
|
frame->key_frame = 1;
|
|
} else {
|
|
frame->pict_type = AV_PICTURE_TYPE_P;
|
|
frame->key_frame = 0;
|
|
}
|
|
|
|
// Get buffer filled with previous frame
|
|
if ((ret = ff_reget_buffer(avctx, frame, 0)) < 0)
|
|
return ret;
|
|
|
|
|
|
for ( i = 0;
|
|
i < frame->height;
|
|
i++, src += linelength, src_size -= linelength
|
|
) {
|
|
// Read line length, two byte little endian
|
|
linelength = AV_RL16(src);
|
|
src += 2;
|
|
|
|
if (src_size < linelength) {
|
|
frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM;
|
|
av_log(avctx, AV_LOG_WARNING, "Frame ended unexpectedly!\n");
|
|
break;
|
|
}
|
|
if (src[linelength - 1] != EOL) {
|
|
frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM;
|
|
av_log(avctx, AV_LOG_WARNING, "Wrong line length %d or line not terminated properly (found 0x%02x)!\n", linelength, src[linelength - 1]);
|
|
break;
|
|
}
|
|
|
|
/* Update the data pointers. Y data is on every line.
|
|
* U and V data on every second line
|
|
*/
|
|
y = &frame->data[0][i * frame->linesize[0]];
|
|
u = &frame->data[1][(i >> 1) * frame->linesize[1]];
|
|
v = &frame->data[2][(i >> 1) * frame->linesize[2]];
|
|
y_end = y + frame->linesize[0] - 1;
|
|
u_end = u + frame->linesize[1] - 1;
|
|
v_end = v + frame->linesize[2] - 1;
|
|
|
|
if ((i & 1) && header[17] == SUBSAMPLE_420) {
|
|
/* We are on an odd line and 420 subsample is used.
|
|
* On this line only Y values are specified, one per pixel.
|
|
*/
|
|
for (j = 0; j < linelength - 1; j++) {
|
|
if (y > y_end) {
|
|
frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM;
|
|
av_log(avctx, AV_LOG_WARNING, "Decoded data exceeded linesize!\n");
|
|
break;
|
|
}
|
|
if ((src[j] & 1) && header[28] == COMPRESSED) {
|
|
/* It seems that odd lines are always uncompressed, but
|
|
* we do it according to specification anyways.
|
|
*/
|
|
skip = src[j] >> 1;
|
|
y += skip;
|
|
} else {
|
|
*(y++) = src[j];
|
|
}
|
|
}
|
|
} else if (header[17] == SUBSAMPLE_420) {
|
|
/* We are on an even line and 420 subsample is used.
|
|
* On this line each pair of pixels is described by four bytes.
|
|
*/
|
|
for (j = 0; j < linelength - 4; ) {
|
|
if (y + 1 > y_end || u > u_end || v > v_end) {
|
|
frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM;
|
|
av_log(avctx, AV_LOG_WARNING, "Decoded data exceeded linesize!\n");
|
|
break;
|
|
}
|
|
if ((src[j] & 1) && header[28] == COMPRESSED) {
|
|
// Skip amount of pixels and move forward one byte
|
|
skip = src[j] >> 1;
|
|
y += skip;
|
|
u += skip >> 1;
|
|
v += skip >> 1;
|
|
j++;
|
|
} else {
|
|
// Set image data as specified and move forward 4 bytes
|
|
*(y++) = src[j];
|
|
*(u++) = src[j+1];
|
|
*(y++) = src[j+2];
|
|
*(v++) = src[j+3];
|
|
j += 4;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
*got_frame = 1;
|
|
if ((ret = av_frame_ref(data, cpia->frame)) < 0)
|
|
return ret;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int cpia_decode_init(AVCodecContext *avctx)
|
|
{
|
|
CpiaContext *s = avctx->priv_data;
|
|
|
|
// output pixel format
|
|
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
|
|
|
|
/* The default timebase set by the v4l2 demuxer leads to probing which is buggy.
|
|
* Set some reasonable time_base to skip this.
|
|
*/
|
|
if (avctx->time_base.num == 1 && avctx->time_base.den == 1000000) {
|
|
avctx->time_base.num = 1;
|
|
avctx->time_base.den = 60;
|
|
}
|
|
|
|
s->frame = av_frame_alloc();
|
|
if (!s->frame)
|
|
return AVERROR(ENOMEM);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int cpia_decode_end(AVCodecContext *avctx)
|
|
{
|
|
CpiaContext *s = avctx->priv_data;
|
|
|
|
av_frame_free(&s->frame);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_cpia_decoder = {
|
|
.name = "cpia",
|
|
.long_name = NULL_IF_CONFIG_SMALL("CPiA video format"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_CPIA,
|
|
.priv_data_size = sizeof(CpiaContext),
|
|
.init = cpia_decode_init,
|
|
.close = cpia_decode_end,
|
|
.decode = cpia_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|