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FFmpeg/libavformat/img2enc.c

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/*
* Image format
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
* Copyright (c) 2004 Michael Niedermayer
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/intreadwrite.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/time_internal.h"
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#include "img2.h"
typedef struct VideoMuxData {
const AVClass *class; /**< Class for private options. */
int img_number;
int is_pipe;
int split_planes; /**< use independent file for each Y, U, V plane */
char path[1024];
char tmp[4][1024];
char target[4][1024];
int update;
int use_strftime;
const char *muxer;
int use_rename;
} VideoMuxData;
static int write_header(AVFormatContext *s)
{
VideoMuxData *img = s->priv_data;
AVStream *st = s->streams[0];
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(st->codecpar->format);
av_strlcpy(img->path, s->filename, sizeof(img->path));
/* find format */
if (s->oformat->flags & AVFMT_NOFILE)
img->is_pipe = 0;
else
img->is_pipe = 1;
if (st->codecpar->codec_id == AV_CODEC_ID_GIF) {
img->muxer = "gif";
} else if (st->codecpar->codec_id == AV_CODEC_ID_FITS) {
img->muxer = "fits";
} else if (st->codecpar->codec_id == AV_CODEC_ID_RAWVIDEO) {
const char *str = strrchr(img->path, '.');
img->split_planes = str
&& !av_strcasecmp(str + 1, "y")
&& s->nb_streams == 1
&& desc
&&(desc->flags & AV_PIX_FMT_FLAG_PLANAR)
&& desc->nb_components >= 3;
}
return 0;
}
static int write_packet(AVFormatContext *s, AVPacket *pkt)
{
VideoMuxData *img = s->priv_data;
AVIOContext *pb[4];
char filename[1024];
AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(par->format);
int i;
int nb_renames = 0;
if (!img->is_pipe) {
if (img->update) {
av_strlcpy(filename, img->path, sizeof(filename));
} else if (img->use_strftime) {
time_t now0;
struct tm *tm, tmpbuf;
time(&now0);
tm = localtime_r(&now0, &tmpbuf);
if (!strftime(filename, sizeof(filename), img->path, tm)) {
av_log(s, AV_LOG_ERROR, "Could not get frame filename with strftime\n");
return AVERROR(EINVAL);
}
} else if (av_get_frame_filename2(filename, sizeof(filename), img->path,
img->img_number,
AV_FRAME_FILENAME_FLAGS_MULTIPLE) < 0 &&
img->img_number > 1) {
av_log(s, AV_LOG_ERROR,
"Could not get frame filename number %d from pattern '%s' (either set updatefirst or use a pattern like %%03d within the filename pattern)\n",
img->img_number, img->path);
return AVERROR(EINVAL);
}
for (i = 0; i < 4; i++) {
snprintf(img->tmp[i], sizeof(img->tmp[i]), "%s.tmp", filename);
av_strlcpy(img->target[i], filename, sizeof(img->target[i]));
if (s->io_open(s, &pb[i], img->use_rename ? img->tmp[i] : filename, AVIO_FLAG_WRITE, NULL) < 0) {
av_log(s, AV_LOG_ERROR, "Could not open file : %s\n", img->use_rename ? img->tmp[i] : filename);
return AVERROR(EIO);
}
if (!img->split_planes || i+1 >= desc->nb_components)
break;
filename[strlen(filename) - 1] = "UVAx"[i];
}
if (img->use_rename)
nb_renames = i + 1;
} else {
pb[0] = s->pb;
}
if (img->split_planes) {
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 21:42:52 +03:00
int ysize = par->width * par->height;
int usize = AV_CEIL_RSHIFT(par->width, desc->log2_chroma_w) * AV_CEIL_RSHIFT(par->height, desc->log2_chroma_h);
if (desc->comp[0].depth >= 9) {
ysize *= 2;
usize *= 2;
}
avio_write(pb[0], pkt->data , ysize);
avio_write(pb[1], pkt->data + ysize , usize);
avio_write(pb[2], pkt->data + ysize + usize, usize);
ff_format_io_close(s, &pb[1]);
ff_format_io_close(s, &pb[2]);
if (desc->nb_components > 3) {
avio_write(pb[3], pkt->data + ysize + 2*usize, ysize);
ff_format_io_close(s, &pb[3]);
}
} else if (img->muxer) {
int ret;
AVStream *st;
AVPacket pkt2 = {0};
AVFormatContext *fmt = NULL;
av_assert0(!img->split_planes);
ret = avformat_alloc_output_context2(&fmt, NULL, img->muxer, s->filename);
if (ret < 0)
return ret;
st = avformat_new_stream(fmt, NULL);
if (!st) {
avformat_free_context(fmt);
return AVERROR(ENOMEM);
}
st->id = pkt->stream_index;
fmt->pb = pb[0];
if ((ret = av_packet_ref(&pkt2, pkt)) < 0 ||
(ret = avcodec_parameters_copy(st->codecpar, s->streams[0]->codecpar)) < 0 ||
(ret = avformat_write_header(fmt, NULL)) < 0 ||
(ret = av_interleaved_write_frame(fmt, &pkt2)) < 0 ||
(ret = av_write_trailer(fmt)) < 0) {
av_packet_unref(&pkt2);
avformat_free_context(fmt);
return ret;
}
av_packet_unref(&pkt2);
avformat_free_context(fmt);
} else {
avio_write(pb[0], pkt->data, pkt->size);
}
avio_flush(pb[0]);
if (!img->is_pipe) {
ff_format_io_close(s, &pb[0]);
for (i = 0; i < nb_renames; i++) {
int ret = ff_rename(img->tmp[i], img->target[i], s);
if (ret < 0)
return ret;
}
}
img->img_number++;
return 0;
}
static int query_codec(enum AVCodecID id, int std_compliance)
{
int i;
for (i = 0; ff_img_tags[i].id != AV_CODEC_ID_NONE; i++)
if (ff_img_tags[i].id == id)
return 1;
// Anything really can be stored in img2
return std_compliance < FF_COMPLIANCE_NORMAL;
}
#define OFFSET(x) offsetof(VideoMuxData, x)
#define ENC AV_OPT_FLAG_ENCODING_PARAM
static const AVOption muxoptions[] = {
{ "updatefirst", "continuously overwrite one file", OFFSET(update), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, ENC },
{ "update", "continuously overwrite one file", OFFSET(update), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, ENC },
{ "start_number", "set first number in the sequence", OFFSET(img_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, INT_MAX, ENC },
{ "strftime", "use strftime for filename", OFFSET(use_strftime), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, ENC },
{ "atomic_writing", "write files atomically (using temporary files and renames)", OFFSET(use_rename), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, ENC },
{ NULL },
};
#if CONFIG_IMAGE2_MUXER
static const AVClass img2mux_class = {
.class_name = "image2 muxer",
.item_name = av_default_item_name,
.option = muxoptions,
.version = LIBAVUTIL_VERSION_INT,
};
AVOutputFormat ff_image2_muxer = {
.name = "image2",
.long_name = NULL_IF_CONFIG_SMALL("image2 sequence"),
.extensions = "bmp,dpx,jls,jpeg,jpg,ljpg,pam,pbm,pcx,pgm,pgmyuv,png,"
"ppm,sgi,tga,tif,tiff,jp2,j2c,j2k,xwd,sun,ras,rs,im1,im8,im24,"
"sunras,xbm,xface,pix,y",
.priv_data_size = sizeof(VideoMuxData),
.video_codec = AV_CODEC_ID_MJPEG,
.write_header = write_header,
.write_packet = write_packet,
.query_codec = query_codec,
.flags = AVFMT_NOTIMESTAMPS | AVFMT_NODIMENSIONS | AVFMT_NOFILE,
.priv_class = &img2mux_class,
};
#endif
#if CONFIG_IMAGE2PIPE_MUXER
AVOutputFormat ff_image2pipe_muxer = {
.name = "image2pipe",
.long_name = NULL_IF_CONFIG_SMALL("piped image2 sequence"),
.priv_data_size = sizeof(VideoMuxData),
.video_codec = AV_CODEC_ID_MJPEG,
.write_header = write_header,
.write_packet = write_packet,
.query_codec = query_codec,
.flags = AVFMT_NOTIMESTAMPS | AVFMT_NODIMENSIONS
};
#endif