mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-29 10:52:20 +00:00
141 lines
4.1 KiB
C
141 lines
4.1 KiB
C
/*
|
|
* PAM image format
|
|
* Copyright (c) 2002, 2003 Fabrice Bellard
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "bytestream.h"
|
|
#include "internal.h"
|
|
|
|
static int pam_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
|
|
const AVFrame *pict, int *got_packet)
|
|
{
|
|
uint8_t *bytestream_start, *bytestream, *bytestream_end;
|
|
const AVFrame * const p = pict;
|
|
int i, h, w, n, linesize, depth, maxval, ret;
|
|
const char *tuple_type;
|
|
uint8_t *ptr;
|
|
|
|
if ((ret = ff_alloc_packet(pkt, avpicture_get_size(avctx->pix_fmt,
|
|
avctx->width,
|
|
avctx->height) + 200)) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
|
|
return ret;
|
|
}
|
|
|
|
bytestream_start =
|
|
bytestream = pkt->data;
|
|
bytestream_end = pkt->data + pkt->size;
|
|
|
|
h = avctx->height;
|
|
w = avctx->width;
|
|
switch (avctx->pix_fmt) {
|
|
case AV_PIX_FMT_MONOWHITE:
|
|
n = (w + 7) >> 3;
|
|
depth = 1;
|
|
maxval = 1;
|
|
tuple_type = "BLACKANDWHITE";
|
|
break;
|
|
case AV_PIX_FMT_GRAY8:
|
|
n = w;
|
|
depth = 1;
|
|
maxval = 255;
|
|
tuple_type = "GRAYSCALE";
|
|
break;
|
|
case AV_PIX_FMT_RGB24:
|
|
n = w * 3;
|
|
depth = 3;
|
|
maxval = 255;
|
|
tuple_type = "RGB";
|
|
break;
|
|
case AV_PIX_FMT_RGB32:
|
|
n = w * 4;
|
|
depth = 4;
|
|
maxval = 255;
|
|
tuple_type = "RGB_ALPHA";
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
snprintf(bytestream, bytestream_end - bytestream,
|
|
"P7\nWIDTH %d\nHEIGHT %d\nDEPTH %d\nMAXVAL %d\nTUPLTYPE %s\nENDHDR\n",
|
|
w, h, depth, maxval, tuple_type);
|
|
bytestream += strlen(bytestream);
|
|
|
|
ptr = p->data[0];
|
|
linesize = p->linesize[0];
|
|
|
|
if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
|
|
int j;
|
|
unsigned int v;
|
|
|
|
for (i = 0; i < h; i++) {
|
|
for (j = 0; j < w; j++) {
|
|
v = ((uint32_t *)ptr)[j];
|
|
bytestream_put_be24(&bytestream, v);
|
|
*bytestream++ = v >> 24;
|
|
}
|
|
ptr += linesize;
|
|
}
|
|
} else {
|
|
for (i = 0; i < h; i++) {
|
|
memcpy(bytestream, ptr, n);
|
|
bytestream += n;
|
|
ptr += linesize;
|
|
}
|
|
}
|
|
|
|
pkt->size = bytestream - bytestream_start;
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
*got_packet = 1;
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int pam_encode_init(AVCodecContext *avctx)
|
|
{
|
|
avctx->coded_frame = av_frame_alloc();
|
|
if (!avctx->coded_frame)
|
|
return AVERROR(ENOMEM);
|
|
|
|
avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
|
|
avctx->coded_frame->key_frame = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int pam_encode_close(AVCodecContext *avctx)
|
|
{
|
|
av_frame_free(&avctx->coded_frame);
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_pam_encoder = {
|
|
.name = "pam",
|
|
.long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_PAM,
|
|
.init = pam_encode_init,
|
|
.close = pam_encode_close,
|
|
.encode2 = pam_encode_frame,
|
|
.pix_fmts = (const enum AVPixelFormat[]){
|
|
AV_PIX_FMT_RGB24, AV_PIX_FMT_RGB32, AV_PIX_FMT_GRAY8, AV_PIX_FMT_MONOWHITE,
|
|
AV_PIX_FMT_NONE
|
|
},
|
|
};
|