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mpv/video/image_writer.c
wm4 72aac9ae8a video: introduce failure path for image allocations
Until now, failure to allocate image data resulted in a crash (i.e.
abort() was called). This was intentional, because it's pretty silly to
degrade playback, and in almost all situations, the OOM will probably
kill you anyway. (And then there's the standard Linux overcommit
behavior, which also will kill you at some point.)

But I changed my opinion, so here we go. This change does not affect
_all_ memory allocations, just image data. Now in most failure cases,
the output will just be skipped. For video filters, this coincidentally
means that failure is treated as EOF (because the playback core assumes
EOF if nothing comes out of the video filter chain). In other
situations, output might be in some way degraded, like skipping frames,
not scaling OSD, and such.

Functions whose return values changed semantics:

  mp_image_alloc
  mp_image_new_copy
  mp_image_new_ref
  mp_image_make_writeable
  mp_image_setrefp
  mp_image_to_av_frame_and_unref
  mp_image_from_av_frame
  mp_image_new_external_ref
  mp_image_new_custom_ref
  mp_image_pool_make_writeable
  mp_image_pool_get
  mp_image_pool_new_copy
  mp_vdpau_mixed_frame_create
  vf_alloc_out_image
  vf_make_out_image_writeable
  glGetWindowScreenshot
2014-06-17 22:43:43 +02:00

326 lines
9.1 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 <libavcodec/avcodec.h>
#include <libavutil/mem.h>
#include "compat/libav.h"
#include "config.h"
#if HAVE_JPEG
#include <jpeglib.h>
#endif
#include "osdep/io.h"
#include "image_writer.h"
#include "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 = "jpg",
.png_compression = 7,
.png_filter = 5,
.jpeg_quality = 90,
.jpeg_optimize = 100,
.jpeg_smooth = 0,
.jpeg_dpi = 72,
.jpeg_progressive = 0,
.jpeg_baseline = 1,
};
#define OPT_BASE_STRUCT struct image_writer_opts
const struct m_sub_options image_writer_conf = {
.opts = (const 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_FLAG("jpeg-progressive", jpeg_progressive, 0),
OPT_FLAG("jpeg-baseline", jpeg_baseline, 0),
OPT_INTRANGE("png-compression", png_compression, 0, 0, 9),
OPT_INTRANGE("png-filter", png_filter, 0, 0, 5),
OPT_STRING("format", format, 0),
{0},
},
.size = sizeof(struct image_writer_opts),
.defaults = &image_writer_opts_defaults,
};
struct image_writer_ctx {
struct mp_log *log;
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);
const int *pixfmts;
int lavc_codec;
};
static int write_lavc(struct image_writer_ctx *ctx, mp_image_t *image, FILE *fp)
{
int success = 0;
AVFrame *pic = NULL;
AVPacket pkt = {0};
int got_output = 0;
av_init_packet(&pkt);
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->w;
avctx->height = image->h;
avctx->pix_fmt = imgfmt2pixfmt(image->imgfmt);
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 (ctx->writer->lavc_codec == AV_CODEC_ID_PNG) {
avctx->compression_level = ctx->opts->png_compression;
avctx->prediction_method = ctx->opts->png_filter;
}
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];
}
int ret = avcodec_encode_video2(avctx, &pkt, pic, &got_output);
if (ret < 0)
goto error_exit;
fwrite(pkt.data, pkt.size, 1, fp);
success = !!got_output;
error_exit:
if (avctx)
avcodec_close(avctx);
av_free(avctx);
av_frame_free(&pic);
av_free_packet(&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 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->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;
cinfo.density_unit = 1; /* 0=unknown, 1=dpi, 2=dpcm */
cinfo.X_density = ctx->opts->jpeg_dpi;
cinfo.Y_density = ctx->opts->jpeg_dpi;
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 = AV_CODEC_ID_PNG },
{ "ppm", write_lavc, .lavc_codec = AV_CODEC_ID_PPM },
{ "pgm", write_lavc,
.lavc_codec = AV_CODEC_ID_PGM,
.pixfmts = (const int[]) { IMGFMT_Y8, 0 },
},
{ "pgmyuv", write_lavc,
.lavc_codec = AV_CODEC_ID_PGMYUV,
.pixfmts = (const int[]) { IMGFMT_420P, 0 },
},
{ "tga", write_lavc,
.lavc_codec = AV_CODEC_ID_TARGA,
.pixfmts = (const int[]) { IMGFMT_BGR24, IMGFMT_BGRA, IMGFMT_RGB555_LE,
IMGFMT_Y8, 0},
},
#if HAVE_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 image_writer_opts *opts,
const char *filename, struct mp_log *log)
{
struct mp_image *allocated_image = NULL;
struct image_writer_opts defs = image_writer_opts_defaults;
int d_w = image->params.d_w;
int d_h = image->params.d_h;
bool is_anamorphic = image->w != d_w || image->h != d_h;
if (!opts)
opts = &defs;
const struct img_writer *writer = get_writer(opts);
struct image_writer_ctx ctx = { log, opts, writer };
int destfmt = IMGFMT_RGB24;
if (writer->pixfmts) {
destfmt = writer->pixfmts[0]; // default to first pixel format
for (const int *fmt = writer->pixfmts; *fmt; fmt++) {
if (*fmt == image->imgfmt) {
destfmt = *fmt;
break;
}
}
}
// Caveat: no colorspace/levels conversion done if pixel formats equal
// it's unclear what colorspace/levels the target wants
if (image->imgfmt != destfmt || is_anamorphic) {
struct mp_image *dst = mp_image_alloc(destfmt, d_w, d_h);
if (!dst) {
mp_err(log, "Out of memory.\n");
return 0;
}
mp_image_copy_attributes(dst, image);
mp_image_swscale(dst, image, mp_sws_hq_flags);
allocated_image = dst;
image = dst;
}
FILE *fp = fopen(filename, "wb");
int success = 0;
if (fp == NULL) {
mp_err(log, "Error opening '%s' for writing!\n", filename);
} else {
success = writer->write(&ctx, image, fp);
success = !fclose(fp) && success;
if (!success)
mp_err(log, "Error writing file '%s'!\n", filename);
}
talloc_free(allocated_image);
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 = "png";
write_image(image, &opts, filename, log);
}