1
mirror of https://github.com/mpv-player/mpv synced 2024-10-26 07:22:17 +02:00
mpv/image_writer.c
wm4 f3bf5ded4a image_writer: make JPG default and increase quality (for screenshots)
The assumption is that JPG screenshots are more useful in general.
Lossless screenshots made from lossy videos are just a waste of space.

Increase JPEG quality a bit. There's a tradeoff between quality and
size, and since JPEG is the default now, attempt to balance the
JPEG settings to provide sane defaults for general use cases.
2012-08-16 00:01:19 +02:00

331 lines
9.7 KiB
C

/*
* This file is part of mplayer.
*
* mplayer 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; either version 2 of the License, or
* (at your option) any later version.
*
* mplayer 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 mplayer. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include <libswscale/swscale.h>
#include <libavcodec/avcodec.h>
#include "config.h"
#ifdef CONFIG_JPEG
#include <jpeglib.h>
#endif
#include "osdep/io.h"
#include "image_writer.h"
#include "talloc.h"
#include "libmpcodecs/img_format.h"
#include "libmpcodecs/mp_image.h"
#include "libmpcodecs/dec_video.h"
#include "libmpcodecs/vf.h"
#include "fmt-conversion.h"
//for sws_getContextFromCmdLine_hq and mp_sws_set_colorspace
#include "libmpcodecs/vf_scale.h"
#include "libvo/csputils.h"
#include "m_option.h"
const struct image_writer_opts image_writer_opts_defaults = {
.format = "jpg",
.png_compression = 7,
.jpeg_quality = 90,
.jpeg_optimize = 100,
.jpeg_smooth = 0,
.jpeg_dpi = 72,
.jpeg_progressive = 0,
.jpeg_baseline = 1,
};
#undef OPT_BASE_STRUCT
#define OPT_BASE_STRUCT struct image_writer_opts
const struct m_sub_options image_writer_conf = {
.opts = (m_option_t[]) {
OPT_INTRANGE("jpeg-quality", jpeg_quality, 0, 0, 100),
OPT_INTRANGE("jpeg-optimize", jpeg_optimize, 0, 0, 100),
OPT_INTRANGE("jpeg-smooth", jpeg_smooth, 0, 0, 100),
OPT_INTRANGE("jpeg-dpi", jpeg_dpi, M_OPT_MIN, 1, 99999),
OPT_MAKE_FLAGS("jpeg-progressive", jpeg_progressive, 0),
OPT_MAKE_FLAGS("jpeg-baseline", jpeg_baseline, 0),
OPT_INTRANGE("png-compression", png_compression, 0, 0, 9),
OPT_STRING("format", format, 0),
{0},
},
.size = sizeof(struct image_writer_opts),
.defaults = &image_writer_opts_defaults,
};
struct image_writer_ctx {
const struct image_writer_opts *opts;
const struct img_writer *writer;
};
struct img_writer {
const char *file_ext;
int (*write)(struct image_writer_ctx *ctx, mp_image_t *image, FILE *fp);
int *pixfmts;
int lavc_codec;
};
static int write_lavc(struct image_writer_ctx *ctx, mp_image_t *image, FILE *fp)
{
void *outbuffer = NULL;
int success = 0;
AVFrame *pic = NULL;
struct AVCodec *codec = avcodec_find_encoder(ctx->writer->lavc_codec);
AVCodecContext *avctx = NULL;
if (!codec)
goto print_open_fail;
avctx = avcodec_alloc_context3(codec);
if (!avctx)
goto print_open_fail;
avctx->time_base = AV_TIME_BASE_Q;
avctx->width = image->width;
avctx->height = image->height;
avctx->pix_fmt = imgfmt2pixfmt(image->imgfmt);
if (ctx->writer->lavc_codec == CODEC_ID_PNG)
avctx->compression_level = ctx->opts->png_compression;
if (avcodec_open2(avctx, codec, NULL) < 0) {
print_open_fail:
mp_msg(MSGT_CPLAYER, MSGL_INFO, "Could not open libavcodec encoder"
" for saving images\n");
goto error_exit;
}
size_t outbuffer_size = image->width * image->height * 3 * 2;
outbuffer = malloc(outbuffer_size);
if (!outbuffer)
goto error_exit;
pic = avcodec_alloc_frame();
if (!pic)
goto error_exit;
avcodec_get_frame_defaults(pic);
for (int n = 0; n < 4; n++) {
pic->data[n] = image->planes[n];
pic->linesize[n] = image->stride[n];
}
int size = avcodec_encode_video(avctx, outbuffer, outbuffer_size, pic);
if (size < 1)
goto error_exit;
fwrite(outbuffer, size, 1, fp);
success = 1;
error_exit:
if (avctx)
avcodec_close(avctx);
av_free(avctx);
av_free(pic);
free(outbuffer);
return success;
}
#ifdef CONFIG_JPEG
static void write_jpeg_error_exit(j_common_ptr cinfo)
{
// NOTE: do not write error message, too much effort to connect the libjpeg
// log callbacks with mplayer's log function mp_msp()
// Return control to the setjmp point
longjmp(*(jmp_buf*)cinfo->client_data, 1);
}
static int write_jpeg(struct image_writer_ctx *ctx, mp_image_t *image, FILE *fp)
{
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jerr.error_exit = write_jpeg_error_exit;
jmp_buf error_return_jmpbuf;
cinfo.client_data = &error_return_jmpbuf;
if (setjmp(cinfo.client_data)) {
jpeg_destroy_compress(&cinfo);
return 0;
}
jpeg_create_compress(&cinfo);
jpeg_stdio_dest(&cinfo, fp);
cinfo.image_width = image->width;
cinfo.image_height = image->height;
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
cinfo.write_JFIF_header = TRUE;
cinfo.JFIF_major_version = 1;
cinfo.JFIF_minor_version = 2;
cinfo.density_unit = 1; /* 0=unknown, 1=dpi, 2=dpcm */
/* Image DPI is determined by Y_density, so we leave that at
jpeg_dpi if possible and crunch X_density instead (PAR > 1) */
// NOTE: write_image never passes anamorphic images currently
cinfo.X_density = ctx->opts->jpeg_dpi*image->width/image->w;
cinfo.Y_density = ctx->opts->jpeg_dpi*image->height/image->h;
cinfo.write_Adobe_marker = TRUE;
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo, ctx->opts->jpeg_quality, ctx->opts->jpeg_baseline);
cinfo.optimize_coding = ctx->opts->jpeg_optimize;
cinfo.smoothing_factor = ctx->opts->jpeg_smooth;
if (ctx->opts->jpeg_progressive)
jpeg_simple_progression(&cinfo);
jpeg_start_compress(&cinfo, TRUE);
while (cinfo.next_scanline < cinfo.image_height) {
JSAMPROW row_pointer[1];
row_pointer[0] = image->planes[0] +
cinfo.next_scanline * image->stride[0];
jpeg_write_scanlines(&cinfo, row_pointer,1);
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
return 1;
}
#endif
static const struct img_writer img_writers[] = {
{ "png", write_lavc, .lavc_codec = CODEC_ID_PNG },
{ "ppm", write_lavc, .lavc_codec = CODEC_ID_PPM },
{ "pgm", write_lavc,
.lavc_codec = CODEC_ID_PGM,
.pixfmts = (int[]) { IMGFMT_Y800, 0 },
},
{ "pgmyuv", write_lavc,
.lavc_codec = CODEC_ID_PGMYUV,
.pixfmts = (int[]) { IMGFMT_YV12, 0 },
},
{ "tga", write_lavc,
.lavc_codec = CODEC_ID_TARGA,
.pixfmts = (int[]) { IMGFMT_BGR24, IMGFMT_BGRA, IMGFMT_BGR15LE,
IMGFMT_Y800, 0},
},
#ifdef CONFIG_JPEG
{ "jpg", write_jpeg },
{ "jpeg", write_jpeg },
#endif
};
static const struct img_writer *get_writer(const struct image_writer_opts *opts)
{
const char *type = opts->format;
for (size_t n = 0; n < sizeof(img_writers) / sizeof(img_writers[0]); n++) {
const struct img_writer *writer = &img_writers[n];
if (type && strcmp(type, writer->file_ext) == 0)
return writer;
}
return &img_writers[0];
}
const char *image_writer_file_ext(const struct image_writer_opts *opts)
{
struct image_writer_opts defs = image_writer_opts_defaults;
if (!opts)
opts = &defs;
return get_writer(opts)->file_ext;
}
int write_image(struct mp_image *image, const struct mp_csp_details *csp,
const struct image_writer_opts *opts, const char *filename)
{
struct mp_image *allocated_image = NULL;
struct image_writer_opts defs = image_writer_opts_defaults;
bool is_anamorphic = image->w != image->width || image->h != image->height;
if (!opts)
opts = &defs;
const struct img_writer *writer = get_writer(opts);
struct image_writer_ctx ctx = { opts, writer };
int destfmt = IMGFMT_RGB24;
if (writer->pixfmts) {
destfmt = writer->pixfmts[0]; // default to first pixel format
for (int *fmt = writer->pixfmts; *fmt; fmt++) {
if (*fmt == image->imgfmt) {
destfmt = *fmt;
break;
}
}
}
if (image->imgfmt != destfmt || is_anamorphic) {
struct mp_image *dst = alloc_mpi(image->w, image->h, destfmt);
struct SwsContext *sws = sws_getContextFromCmdLine_hq(image->width,
image->height,
image->imgfmt,
dst->width,
dst->height,
dst->imgfmt);
struct mp_csp_details colorspace = MP_CSP_DETAILS_DEFAULTS;
if (csp)
colorspace = *csp;
// This is a property of the output device; images always use
// full-range RGB.
colorspace.levels_out = MP_CSP_LEVELS_PC;
mp_sws_set_colorspace(sws, &colorspace);
sws_scale(sws, (const uint8_t **)image->planes, image->stride, 0,
image->height, dst->planes, dst->stride);
sws_freeContext(sws);
allocated_image = dst;
image = dst;
}
FILE *fp = fopen(filename, "wb");
int success = 0;
if (fp == NULL) {
mp_msg(MSGT_CPLAYER, MSGL_ERR,
"Error opening '%s' for writing!\n", filename);
} else {
success = writer->write(&ctx, image, fp);
success = !fclose(fp) && success;
if (!success)
mp_msg(MSGT_CPLAYER, MSGL_ERR, "Error writing file '%s'!\n",
filename);
}
free_mp_image(allocated_image);
return success;
}