mirror of https://git.videolan.org/git/ffmpeg.git
141 lines
4.1 KiB
C
141 lines
4.1 KiB
C
/*
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* PAM image format
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* Copyright (c) 2002, 2003 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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static int pam_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *pict, int *got_packet)
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{
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uint8_t *bytestream_start, *bytestream, *bytestream_end;
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const AVFrame * const p = pict;
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int i, h, w, n, linesize, depth, maxval, ret;
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const char *tuple_type;
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uint8_t *ptr;
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if ((ret = ff_alloc_packet(pkt, avpicture_get_size(avctx->pix_fmt,
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avctx->width,
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avctx->height) + 200)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
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return ret;
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}
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bytestream_start =
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bytestream = pkt->data;
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bytestream_end = pkt->data + pkt->size;
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h = avctx->height;
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w = avctx->width;
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switch (avctx->pix_fmt) {
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case AV_PIX_FMT_MONOWHITE:
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n = (w + 7) >> 3;
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depth = 1;
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maxval = 1;
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tuple_type = "BLACKANDWHITE";
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break;
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case AV_PIX_FMT_GRAY8:
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n = w;
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depth = 1;
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maxval = 255;
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tuple_type = "GRAYSCALE";
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break;
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case AV_PIX_FMT_RGB24:
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n = w * 3;
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depth = 3;
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maxval = 255;
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tuple_type = "RGB";
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break;
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case AV_PIX_FMT_RGB32:
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n = w * 4;
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depth = 4;
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maxval = 255;
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tuple_type = "RGB_ALPHA";
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break;
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default:
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return -1;
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}
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snprintf(bytestream, bytestream_end - bytestream,
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"P7\nWIDTH %d\nHEIGHT %d\nDEPTH %d\nMAXVAL %d\nTUPLTYPE %s\nENDHDR\n",
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w, h, depth, maxval, tuple_type);
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bytestream += strlen(bytestream);
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ptr = p->data[0];
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linesize = p->linesize[0];
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if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
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int j;
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unsigned int v;
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for (i = 0; i < h; i++) {
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for (j = 0; j < w; j++) {
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v = ((uint32_t *)ptr)[j];
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bytestream_put_be24(&bytestream, v);
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*bytestream++ = v >> 24;
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}
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ptr += linesize;
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}
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} else {
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for (i = 0; i < h; i++) {
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memcpy(bytestream, ptr, n);
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bytestream += n;
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ptr += linesize;
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}
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}
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pkt->size = bytestream - bytestream_start;
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pkt->flags |= AV_PKT_FLAG_KEY;
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*got_packet = 1;
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return 0;
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}
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static av_cold int pam_encode_init(AVCodecContext *avctx)
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{
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avctx->coded_frame = av_frame_alloc();
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if (!avctx->coded_frame)
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return AVERROR(ENOMEM);
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avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
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avctx->coded_frame->key_frame = 1;
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return 0;
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}
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static av_cold int pam_encode_close(AVCodecContext *avctx)
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{
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av_frame_free(&avctx->coded_frame);
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return 0;
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}
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AVCodec ff_pam_encoder = {
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.name = "pam",
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.long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_PAM,
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.init = pam_encode_init,
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.close = pam_encode_close,
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.encode2 = pam_encode_frame,
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.pix_fmts = (const enum AVPixelFormat[]){
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AV_PIX_FMT_RGB24, AV_PIX_FMT_RGB32, AV_PIX_FMT_GRAY8, AV_PIX_FMT_MONOWHITE,
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AV_PIX_FMT_NONE
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},
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};
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