0971fcf0a0
The aim of this is twofold: a) Clang warns when setting a deprecated field in a definition and because several of the widely set AVCodec fields are deprecated, one gets several hundred warnings from Clang for an ordinary build. Yet fortunately Clang (unlike GCC) allows to disable deprecation warnings inside a definition, so that one can create simple macros to set these fields that also suppress deprecation warnings for Clang. This has already been done in fdff1b9cbfd8cf5a9810c29efa4baf13a4786742 for AVCodec.channel_layouts. b) Using macros will allow to easily migrate these fields to internal ones. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
113 lines
3.5 KiB
C
113 lines
3.5 KiB
C
/*
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* Alias PIX image encoder
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* Copyright (C) 2014 Vittorio Giovara <vittorio.giovara@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "codec_internal.h"
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#include "encode.h"
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#define ALIAS_HEADER_SIZE 10
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static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *frame, int *got_packet)
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{
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int width, height, bits_pixel, length, ret;
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uint8_t *buf;
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width = avctx->width;
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height = avctx->height;
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if (width > 65535 || height > 65535 ||
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width * height >= INT_MAX / 4 - ALIAS_HEADER_SIZE) {
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av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n", width, height);
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return AVERROR_INVALIDDATA;
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}
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switch (avctx->pix_fmt) {
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case AV_PIX_FMT_GRAY8:
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bits_pixel = 8;
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break;
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case AV_PIX_FMT_BGR24:
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bits_pixel = 24;
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break;
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default:
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return AVERROR(EINVAL);
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}
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length = ALIAS_HEADER_SIZE + 4 * width * height; // max possible
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if ((ret = ff_alloc_packet(avctx, pkt, length)) < 0)
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return ret;
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buf = pkt->data;
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/* Encode header. */
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bytestream_put_be16(&buf, width);
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bytestream_put_be16(&buf, height);
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bytestream_put_be32(&buf, 0); /* X, Y offset */
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bytestream_put_be16(&buf, bits_pixel);
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for (int j = 0, bytes_pixel = bits_pixel >> 3; j < height; j++) {
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const uint8_t *in_buf = frame->data[0] + frame->linesize[0] * j;
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const uint8_t *const line_end = in_buf + bytes_pixel * width;
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while (in_buf < line_end) {
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int count = 0;
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int pixel;
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if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
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pixel = *in_buf;
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while (count < 255 && in_buf < line_end && pixel == *in_buf) {
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count++;
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in_buf++;
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}
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bytestream_put_byte(&buf, count);
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bytestream_put_byte(&buf, pixel);
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} else { /* AV_PIX_FMT_BGR24 */
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pixel = AV_RB24(in_buf);
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while (count < 255 && in_buf < line_end &&
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pixel == AV_RB24(in_buf)) {
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count++;
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in_buf += 3;
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}
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bytestream_put_byte(&buf, count);
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bytestream_put_be24(&buf, pixel);
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}
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}
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}
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/* Total length */
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av_shrink_packet(pkt, buf - pkt->data);
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*got_packet = 1;
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return 0;
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}
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const FFCodec ff_alias_pix_encoder = {
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.p.name = "alias_pix",
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CODEC_LONG_NAME("Alias/Wavefront PIX image"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_ALIAS_PIX,
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.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
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FF_CODEC_ENCODE_CB(encode_frame),
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CODEC_PIXFMTS(AV_PIX_FMT_BGR24, AV_PIX_FMT_GRAY8),
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};
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