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/*
* This file is part of Unpaper.
*
* Copyright © 2005-2007 Jens Gulden
* Copyright © 2011-2011 Diego Elio Pettenò
*
* Unpaper is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 2 of the License.
*
* Unpaper 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
/* --- tool functions for file handling ------------------------------------ */
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libavutil/avutil.h>
#include "unpaper.h"
#include "tools.h"
/**
* Loads image data from a file in pnm format.
*
* @param f file to load
* @param image structure to hold loaded image
* @param type returns the type of the loaded image
*/
void loadImage(const char *filename, AVFrame **image) {
int ret, got_frame = 0;
AVFormatContext *s = NULL;
AVCodecContext *avctx = avcodec_alloc_context3(NULL);
AVCodec *codec;
AVPacket pkt;
AVFrame *frame = av_frame_alloc();
char errbuff[1024];
if (!avctx)
errOutput("cannot allocate a new context");
ret = avformat_open_input(&s, filename, NULL, NULL);
if (ret < 0) {
av_strerror(ret, errbuff, sizeof(errbuff));
errOutput("unable to open file %s: %s", filename, errbuff);
}
avformat_find_stream_info(s, NULL);
if (verbose >= VERBOSE_MORE)
av_dump_format(s, 0, filename, 0);
if (s->nb_streams < 1)
errOutput("unable to open file %s: missing streams", filename);
if (s->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO)
errOutput("unable to open file %s: wrong stream", filename);
ret = avcodec_copy_context(avctx, s->streams[0]->codec);
if (ret < 0) {
av_strerror(ret, errbuff, sizeof(errbuff));
errOutput("cannot set the new context for %s: %s", filename, errbuff);
}
codec = avcodec_find_decoder(avctx->codec_id);
if (!codec)
errOutput("unable to open file %s: unsupported format", filename);
ret = avcodec_open2(avctx, codec, NULL);
if (ret < 0) {
av_strerror(ret, errbuff, sizeof(errbuff));
errOutput("unable to open file %s: %s", filename, errbuff);
}
ret = av_read_frame(s, &pkt);
if (ret < 0) {
av_strerror(ret, errbuff, sizeof(errbuff));
errOutput("unable to open file %s: %s", filename, errbuff);
}
if (pkt.stream_index != 0)
errOutput("unable to open file %s: invalid stream.", filename);
while (!got_frame && pkt.data) {
if (pkt.size <= 0) {
pkt.data = NULL;
pkt.size = 0;
}
ret = avcodec_decode_video2(avctx, frame, &got_frame, &pkt);
if (ret < 0) {
av_strerror(ret, errbuff, sizeof(errbuff));
errOutput("unable to open file %s: %s", filename, errbuff);
}
pkt.data += ret;
pkt.size -= ret;
}
switch(frame->format) {
case AV_PIX_FMT_Y400A: // 8-bit grayscale PNG
case AV_PIX_FMT_GRAY8:
case AV_PIX_FMT_RGB24:
case AV_PIX_FMT_MONOBLACK:
case AV_PIX_FMT_MONOWHITE:
*image = frame;
break;
case AV_PIX_FMT_PAL8:
initImage(image, frame->width, frame->height, AV_PIX_FMT_RGB24, -1);
const uint32_t *palette = (const uint32_t *)frame->data[1];
for (int y = 0; y < frame->height; y++) {
for (int x = 0; x < frame->width; x++) {
const uint8_t palette_index = frame->data[0][frame->linesize[0]*y + x];
setPixel(palette[palette_index], x, y, *image);
}
}
break;
default:
errOutput("unable to open file %s: unsupported pixel format", filename);
}
}
/**
* Saves image data to a file in pgm or pbm format.
*
* @param filename file name to save image to
* @param image image to save
* @param type filetype of the image to save
* @return true on success, false on failure
*/
void saveImage(char *filename, AVFrame *image, int outputPixFmt) {
AVOutputFormat *fmt = NULL;
enum AVCodecID output_codec = -1;
AVCodec *codec;
AVFormatContext *out_ctx;
AVCodecContext *codec_ctx;
AVStream *video_st;
int ret;
char errbuff[1024];
fmt = av_guess_format("image2", NULL, NULL);
if ( !fmt ) {
errOutput("could not find suitable output format.");
}
out_ctx = avformat_alloc_context();
if ( !out_ctx ) {
errOutput("unable to allocate output context.");
}
out_ctx->oformat = fmt;
snprintf(out_ctx->filename, sizeof(out_ctx->filename), "%s", filename);
switch (outputPixFmt) {
case AV_PIX_FMT_RGB24:
output_codec = AV_CODEC_ID_PPM;
break;
case AV_PIX_FMT_Y400A:
case AV_PIX_FMT_GRAY8:
outputPixFmt = AV_PIX_FMT_GRAY8;
output_codec = AV_CODEC_ID_PGM;
break;
case AV_PIX_FMT_MONOBLACK:
case AV_PIX_FMT_MONOWHITE:
outputPixFmt = AV_PIX_FMT_MONOWHITE;
output_codec = AV_CODEC_ID_PBM;
break;
}
if ( image->format != outputPixFmt ) {
AVFrame *output;
initImage(&output, image->width, image->height,
outputPixFmt, -1);
copyImageArea(0, 0, image->width, image->height,
image, 0, 0, output);
image = output;
}
codec = avcodec_find_encoder(output_codec);
if ( !codec ) {
errOutput("output codec not found");
}
video_st = avformat_new_stream(out_ctx, codec);
if ( !video_st ) {
errOutput("could not alloc output stream");
}
codec_ctx = video_st->codec;
codec_ctx->width = image->width;
codec_ctx->height = image->height;
codec_ctx->pix_fmt = image->format;
video_st->time_base.den = codec_ctx->time_base.den = 1;
video_st->time_base.num = codec_ctx->time_base.num = 1;
ret = avcodec_open2(codec_ctx, codec, NULL);
if (ret < 0) {
av_strerror(ret, errbuff, sizeof(errbuff));
errOutput("unable to open codec: %s", errbuff);
}
if (verbose >= VERBOSE_MORE)
av_dump_format(out_ctx, 0, filename, 1);
if (avio_open(&out_ctx->pb, filename, AVIO_FLAG_WRITE) < 0) {
errOutput("could not open '%s'", filename);
}
avformat_write_header(out_ctx, NULL);
AVPacket pkt = { 0 };
int got_packet;
av_init_packet(&pkt);
/* encode the image */
ret = avcodec_encode_video2(video_st->codec, &pkt, image, &got_packet);
if (ret < 0) {
av_strerror(ret, errbuff, sizeof(errbuff));
errOutput("unable to write file %s: %s", filename, errbuff);
}
av_write_frame(out_ctx, &pkt);
av_write_trailer(out_ctx);
avcodec_close(codec_ctx);
av_free(codec_ctx);
av_free(video_st);
avio_close(out_ctx->pb);
av_free(out_ctx);
}
/**
* Saves the image if full debugging mode is enabled.
*/
void saveDebug(char *filenameTemplate, int index, AVFrame *image) {
if ( verbose >= VERBOSE_DEBUG_SAVE ) {
char debugFilename[100];
sprintf(debugFilename, filenameTemplate, index);
saveImage(debugFilename, image, image->format);
}
}
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