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mpv/video/image_writer.c

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/*
* This file is part of mpv.
*
* mpv 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.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libavcodec/avcodec.h>
#include <libavutil/mem.h>
#include <libavutil/opt.h>
#include "config.h"
#if HAVE_JPEG
#include <setjmp.h>
#include <jpeglib.h>
#endif
#include "osdep/io.h"
#include "image_writer.h"
#include "mpv_talloc.h"
#include "video/img_format.h"
#include "video/mp_image.h"
#include "video/fmt-conversion.h"
#include "video/sws_utils.h"
#include "options/m_option.h"
const struct image_writer_opts image_writer_opts_defaults = {
.format = AV_CODEC_ID_MJPEG,
.high_bit_depth = 1,
.png_compression = 7,
.png_filter = 5,
.jpeg_quality = 90,
.jpeg_source_chroma = 1,
.webp_lossless = 0,
.webp_quality = 75,
.webp_compression = 4,
.jxl_distance = 1.0,
.jxl_effort = 3,
.tag_csp = 0,
};
const struct m_opt_choice_alternatives mp_image_writer_formats[] = {
{"jpg", AV_CODEC_ID_MJPEG},
{"jpeg", AV_CODEC_ID_MJPEG},
{"png", AV_CODEC_ID_PNG},
{"webp", AV_CODEC_ID_WEBP},
#if HAVE_JPEGXL
{"jxl", AV_CODEC_ID_JPEGXL},
#endif
{0}
};
#define OPT_BASE_STRUCT struct image_writer_opts
const struct m_option image_writer_opts[] = {
{"format", OPT_CHOICE_C(format, mp_image_writer_formats)},
{"jpeg-quality", OPT_INT(jpeg_quality), M_RANGE(0, 100)},
{"jpeg-source-chroma", OPT_FLAG(jpeg_source_chroma)},
{"png-compression", OPT_INT(png_compression), M_RANGE(0, 9)},
{"png-filter", OPT_INT(png_filter), M_RANGE(0, 5)},
{"webp-lossless", OPT_FLAG(webp_lossless)},
{"webp-quality", OPT_INT(webp_quality), M_RANGE(0, 100)},
{"webp-compression", OPT_INT(webp_compression), M_RANGE(0, 6)},
#if HAVE_JPEGXL
{"jxl-distance", OPT_DOUBLE(jxl_distance), M_RANGE(0.0, 15.0)},
{"jxl-effort", OPT_INT(jxl_effort), M_RANGE(1, 9)},
#endif
{"high-bit-depth", OPT_FLAG(high_bit_depth)},
{"tag-colorspace", OPT_FLAG(tag_csp)},
{0},
};
struct image_writer_ctx {
struct mp_log *log;
const struct image_writer_opts *opts;
struct mp_imgfmt_desc original_format;
};
static enum AVPixelFormat replace_j_format(enum AVPixelFormat fmt)
{
switch (fmt) {
case AV_PIX_FMT_YUV420P: return AV_PIX_FMT_YUVJ420P;
case AV_PIX_FMT_YUV422P: return AV_PIX_FMT_YUVJ422P;
case AV_PIX_FMT_YUV444P: return AV_PIX_FMT_YUVJ444P;
}
return fmt;
}
static bool write_lavc(struct image_writer_ctx *ctx, mp_image_t *image, FILE *fp)
{
bool success = false;
AVFrame *pic = NULL;
AVPacket *pkt = NULL;
const AVCodec *codec;
if (ctx->opts->format == AV_CODEC_ID_WEBP) {
codec = avcodec_find_encoder_by_name("libwebp"); // non-animated encoder
} else {
codec = avcodec_find_encoder(ctx->opts->format);
}
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->w;
avctx->height = image->h;
avctx->color_range = mp_csp_levels_to_avcol_range(image->params.color.levels);
avctx->pix_fmt = imgfmt2pixfmt(image->imgfmt);
if (codec->id == AV_CODEC_ID_MJPEG) {
// Annoying deprecated garbage for the jpg encoder.
if (image->params.color.levels == MP_CSP_LEVELS_PC)
avctx->pix_fmt = replace_j_format(avctx->pix_fmt);
}
if (avctx->pix_fmt == AV_PIX_FMT_NONE) {
MP_ERR(ctx, "Image format %s not supported by lavc.\n",
mp_imgfmt_to_name(image->imgfmt));
goto error_exit;
}
if (codec->id == AV_CODEC_ID_PNG) {
avctx->compression_level = ctx->opts->png_compression;
av_opt_set_int(avctx, "pred", ctx->opts->png_filter,
AV_OPT_SEARCH_CHILDREN);
} else if (codec->id == AV_CODEC_ID_WEBP) {
avctx->compression_level = ctx->opts->webp_compression;
av_opt_set_int(avctx, "lossless", ctx->opts->webp_lossless,
AV_OPT_SEARCH_CHILDREN);
av_opt_set_int(avctx, "quality", ctx->opts->webp_quality,
AV_OPT_SEARCH_CHILDREN);
#if HAVE_JPEGXL
} else if (codec->id == AV_CODEC_ID_JPEGXL) {
av_opt_set_double(avctx, "distance", ctx->opts->jxl_distance,
AV_OPT_SEARCH_CHILDREN);
av_opt_set_int(avctx, "effort", ctx->opts->jxl_effort,
AV_OPT_SEARCH_CHILDREN);
#endif
}
if (avcodec_open2(avctx, codec, NULL) < 0) {
print_open_fail:
MP_ERR(ctx, "Could not open libavcodec encoder for saving images\n");
goto error_exit;
}
pic = av_frame_alloc();
if (!pic)
goto error_exit;
for (int n = 0; n < 4; n++) {
pic->data[n] = image->planes[n];
pic->linesize[n] = image->stride[n];
}
pic->format = avctx->pix_fmt;
pic->width = avctx->width;
pic->height = avctx->height;
pic->color_range = avctx->color_range;
if (ctx->opts->tag_csp) {
avctx->color_primaries = pic->color_primaries =
mp_csp_prim_to_avcol_pri(image->params.color.primaries);
avctx->color_trc = pic->color_trc =
mp_csp_trc_to_avcol_trc(image->params.color.gamma);
}
int ret = avcodec_send_frame(avctx, pic);
if (ret < 0)
goto error_exit;
ret = avcodec_send_frame(avctx, NULL); // send EOF
if (ret < 0)
goto error_exit;
pkt = av_packet_alloc();
if (!pkt)
goto error_exit;
ret = avcodec_receive_packet(avctx, pkt);
if (ret < 0)
goto error_exit;
success = true;
fwrite(pkt->data, pkt->size, 1, fp);
error_exit:
avcodec_free_context(&avctx);
av_frame_free(&pic);
av_packet_free(&pkt);
return success;
}
#if HAVE_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 bool 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 false;
}
jpeg_create_compress(&cinfo);
jpeg_stdio_dest(&cinfo, fp);
cinfo.image_width = image->w;
cinfo.image_height = image->h;
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;
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo, ctx->opts->jpeg_quality, 0);
if (ctx->opts->jpeg_source_chroma) {
cinfo.comp_info[0].h_samp_factor = 1 << ctx->original_format.chroma_xs;
cinfo.comp_info[0].v_samp_factor = 1 << ctx->original_format.chroma_ys;
}
jpeg_start_compress(&cinfo, TRUE);
while (cinfo.next_scanline < cinfo.image_height) {
JSAMPROW row_pointer[1];
row_pointer[0] = image->planes[0] +
(ptrdiff_t)cinfo.next_scanline * image->stride[0];
jpeg_write_scanlines(&cinfo, row_pointer,1);
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
return true;
}
#endif
static int get_encoder_format(const AVCodec *codec, int srcfmt, bool highdepth)
{
const enum AVPixelFormat *pix_fmts = codec->pix_fmts;
int current = 0;
for (int n = 0; pix_fmts && pix_fmts[n] != AV_PIX_FMT_NONE; n++) {
int fmt = pixfmt2imgfmt(pix_fmts[n]);
if (!fmt)
continue;
if (!highdepth) {
// Ignore formats larger than 8 bit per pixel. (Or which are unknown.)
struct mp_regular_imgfmt rdesc;
if (!mp_get_regular_imgfmt(&rdesc, fmt)) {
int ofmt = mp_find_other_endian(fmt);
if (!mp_get_regular_imgfmt(&rdesc, ofmt))
continue;
}
if (rdesc.component_size > 1)
continue;
}
current = current ? mp_imgfmt_select_best(current, fmt, srcfmt) : fmt;
}
return current;
}
static int get_target_format(struct image_writer_ctx *ctx)
{
const AVCodec *codec = avcodec_find_encoder(ctx->opts->format);
if (!codec)
goto unknown;
int srcfmt = ctx->original_format.id;
int target = get_encoder_format(codec, srcfmt, ctx->opts->high_bit_depth);
if (!target)
target = get_encoder_format(codec, srcfmt, true);
if (!target)
goto unknown;
return target;
unknown:
return IMGFMT_RGB0;
}
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 m_opt_choice_str(mp_image_writer_formats, opts->format);
}
bool image_writer_high_depth(const struct image_writer_opts *opts)
{
return opts->format == AV_CODEC_ID_PNG
#if HAVE_JPEGXL
|| opts->format == AV_CODEC_ID_JPEGXL
#endif
;
}
int image_writer_format_from_ext(const char *ext)
{
for (int n = 0; mp_image_writer_formats[n].name; n++) {
if (ext && strcmp(mp_image_writer_formats[n].name, ext) == 0)
return mp_image_writer_formats[n].value;
}
return 0;
}
static struct mp_image *convert_image(struct mp_image *image, int destfmt,
enum mp_csp_levels yuv_levels,
struct mpv_global *global,
struct mp_log *log)
{
int d_w, d_h;
mp_image_params_get_dsize(&image->params, &d_w, &d_h);
struct mp_image_params p = {
.imgfmt = destfmt,
.w = d_w,
.h = d_h,
.p_w = 1,
.p_h = 1,
};
mp_image_params_guess_csp(&p);
// If RGB, just assume everything is correct.
if (p.color.space != MP_CSP_RGB) {
// Currently, assume what FFmpeg's jpg encoder or libwebp needs.
// Of course this works only for non-HDR (no HDR support in libswscale).
p.color.levels = yuv_levels;
p.color.space = MP_CSP_BT_601;
p.chroma_location = MP_CHROMA_CENTER;
mp_image_params_guess_csp(&p);
}
if (mp_image_params_equal(&p, &image->params))
return mp_image_new_ref(image);
struct mp_image *dst = mp_image_alloc(p.imgfmt, p.w, p.h);
if (!dst) {
mp_err(log, "Out of memory.\n");
return NULL;
}
mp_image_copy_attributes(dst, image);
dst->params = p;
struct mp_sws_context *sws = mp_sws_alloc(NULL);
sws->log = log;
if (global)
mp_sws_enable_cmdline_opts(sws, global);
bool ok = mp_sws_scale(sws, dst, image) >= 0;
talloc_free(sws);
if (!ok) {
mp_err(log, "Error when converting image.\n");
talloc_free(dst);
return NULL;
}
return dst;
}
bool write_image(struct mp_image *image, const struct image_writer_opts *opts,
const char *filename, struct mpv_global *global,
struct mp_log *log)
{
struct image_writer_opts defs = image_writer_opts_defaults;
if (!opts)
opts = &defs;
struct image_writer_ctx ctx = { log, opts, image->fmt };
bool (*write)(struct image_writer_ctx *, mp_image_t *, FILE *) = write_lavc;
int destfmt = 0;
#if HAVE_JPEG
if (opts->format == AV_CODEC_ID_MJPEG) {
write = write_jpeg;
destfmt = IMGFMT_RGB24;
}
#endif
if (opts->format == AV_CODEC_ID_WEBP && !opts->webp_lossless) {
// For lossy images, libwebp has its own RGB->YUV conversion.
// We don't want that, so force YUV/YUVA here.
int alpha = image->fmt.flags & MP_IMGFLAG_ALPHA;
destfmt = alpha ? pixfmt2imgfmt(AV_PIX_FMT_YUVA420P) : IMGFMT_420P;
}
if (!destfmt)
destfmt = get_target_format(&ctx);
enum mp_csp_levels levels; // Ignored if destfmt is a RGB format
if (opts->format == AV_CODEC_ID_WEBP) {
levels = MP_CSP_LEVELS_TV;
} else {
levels = MP_CSP_LEVELS_PC;
}
struct mp_image *dst = convert_image(image, destfmt, levels, global, log);
if (!dst)
return false;
FILE *fp = fopen(filename, "wb");
bool success = false;
if (fp == NULL) {
mp_err(log, "Error opening '%s' for writing!\n", filename);
} else {
success = write(&ctx, dst, fp);
success = !fclose(fp) && success;
if (!success)
mp_err(log, "Error writing file '%s'!\n", filename);
}
talloc_free(dst);
return success;
}
void dump_png(struct mp_image *image, const char *filename, struct mp_log *log)
{
struct image_writer_opts opts = image_writer_opts_defaults;
opts.format = AV_CODEC_ID_PNG;
write_image(image, &opts, filename, NULL, log);
}
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