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ffmpeg/libavformat/options.c

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/*
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
*
* 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 "avformat.h"
#include "avio_internal.h"
#include "demux.h"
#include "internal.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/codec_par.h"
#include "libavutil/avassert.h"
#include "libavutil/internal.h"
#include "libavutil/intmath.h"
#include "libavutil/opt.h"
/**
* @file
* Options definition for AVFormatContext.
*/
FF_DISABLE_DEPRECATION_WARNINGS
#include "options_table.h"
FF_ENABLE_DEPRECATION_WARNINGS
static const char* format_to_name(void* ptr)
{
AVFormatContext* fc = (AVFormatContext*) ptr;
if(fc->iformat) return fc->iformat->name;
else if(fc->oformat) return fc->oformat->name;
else return "NULL";
}
static void *format_child_next(void *obj, void *prev)
{
AVFormatContext *s = obj;
if (!prev && s->priv_data &&
((s->iformat && s->iformat->priv_class) ||
s->oformat && s->oformat->priv_class))
return s->priv_data;
if (s->pb && s->pb->av_class && prev != s->pb)
return s->pb;
return NULL;
}
enum {
CHILD_CLASS_ITER_AVIO = 0,
CHILD_CLASS_ITER_MUX,
CHILD_CLASS_ITER_DEMUX,
CHILD_CLASS_ITER_DONE,
};
#define ITER_STATE_SHIFT 16
static const AVClass *format_child_class_iterate(void **iter)
{
// we use the low 16 bits of iter as the value to be passed to
// av_(de)muxer_iterate()
void *val = (void*)(((uintptr_t)*iter) & ((1 << ITER_STATE_SHIFT) - 1));
unsigned int state = ((uintptr_t)*iter) >> ITER_STATE_SHIFT;
const AVClass *ret = NULL;
if (state == CHILD_CLASS_ITER_AVIO) {
ret = &ff_avio_class;
state++;
goto finish;
}
if (state == CHILD_CLASS_ITER_MUX) {
const AVOutputFormat *ofmt;
while ((ofmt = av_muxer_iterate(&val))) {
ret = ofmt->priv_class;
if (ret)
goto finish;
}
val = NULL;
state++;
}
if (state == CHILD_CLASS_ITER_DEMUX) {
const AVInputFormat *ifmt;
while ((ifmt = av_demuxer_iterate(&val))) {
ret = ifmt->priv_class;
if (ret)
goto finish;
}
val = NULL;
state++;
}
finish:
// make sure none av_(de)muxer_iterate does not set the high bits of val
av_assert0(!((uintptr_t)val >> ITER_STATE_SHIFT));
*iter = (void*)((uintptr_t)val | (state << ITER_STATE_SHIFT));
return ret;
}
static AVClassCategory get_category(void *ptr)
{
AVFormatContext* s = ptr;
if(s->iformat) return AV_CLASS_CATEGORY_DEMUXER;
else return AV_CLASS_CATEGORY_MUXER;
}
static const AVClass av_format_context_class = {
.class_name = "AVFormatContext",
.item_name = format_to_name,
.option = avformat_options,
.version = LIBAVUTIL_VERSION_INT,
.child_next = format_child_next,
.child_class_iterate = format_child_class_iterate,
.category = AV_CLASS_CATEGORY_MUXER,
.get_category = get_category,
};
static int io_open_default(AVFormatContext *s, AVIOContext **pb,
const char *url, int flags, AVDictionary **options)
{
int loglevel;
if (!strcmp(url, s->url) ||
s->iformat && !strcmp(s->iformat->name, "image2") ||
s->oformat && !strcmp(s->oformat->name, "image2")
) {
loglevel = AV_LOG_DEBUG;
} else
loglevel = AV_LOG_INFO;
av_log(s, loglevel, "Opening \'%s\' for %s\n", url, flags & AVIO_FLAG_WRITE ? "writing" : "reading");
return ffio_open_whitelist(pb, url, flags, &s->interrupt_callback, options, s->protocol_whitelist, s->protocol_blacklist);
}
static int io_close2_default(AVFormatContext *s, AVIOContext *pb)
{
return avio_close(pb);
}
AVFormatContext *avformat_alloc_context(void)
{
FFFormatContext *const si = av_mallocz(sizeof(*si));
AVFormatContext *s;
if (!si)
return NULL;
s = &si->pub;
s->av_class = &av_format_context_class;
s->io_open = io_open_default;
s->io_close = ff_format_io_close_default;
s->io_close2= io_close2_default;
av_opt_set_defaults(s);
si->pkt = av_packet_alloc();
si->parse_pkt = av_packet_alloc();
if (!si->pkt || !si->parse_pkt) {
avformat_free_context(s);
return NULL;
}
si->shortest_end = AV_NOPTS_VALUE;
return s;
}
enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx)
{
return ctx->duration_estimation_method;
}
const AVClass *avformat_get_class(void)
{
return &av_format_context_class;
}
static const AVOption stream_options[] = {
{ "disposition", NULL, offsetof(AVStream, disposition), AV_OPT_TYPE_FLAGS, { .i64 = 0 },
.flags = AV_OPT_FLAG_ENCODING_PARAM, .unit = "disposition" },
{ "default", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_DEFAULT }, .unit = "disposition" },
{ "dub", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_DUB }, .unit = "disposition" },
{ "original", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_ORIGINAL }, .unit = "disposition" },
{ "comment", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_COMMENT }, .unit = "disposition" },
{ "lyrics", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_LYRICS }, .unit = "disposition" },
{ "karaoke", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_KARAOKE }, .unit = "disposition" },
{ "forced", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_FORCED }, .unit = "disposition" },
{ "hearing_impaired", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_HEARING_IMPAIRED }, .unit = "disposition" },
{ "visual_impaired", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_VISUAL_IMPAIRED }, .unit = "disposition" },
{ "clean_effects", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_CLEAN_EFFECTS }, .unit = "disposition" },
{ "attached_pic", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_ATTACHED_PIC }, .unit = "disposition" },
{ "timed_thumbnails", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_TIMED_THUMBNAILS }, .unit = "disposition" },
{ "captions", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_CAPTIONS }, .unit = "disposition" },
{ "descriptions", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_DESCRIPTIONS }, .unit = "disposition" },
{ "metadata", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_METADATA }, .unit = "disposition" },
{ "dependent", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_DEPENDENT }, .unit = "disposition" },
{ "still_image", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_STILL_IMAGE }, .unit = "disposition" },
{ NULL }
};
static const AVClass stream_class = {
.class_name = "AVStream",
.item_name = av_default_item_name,
.version = LIBAVUTIL_VERSION_INT,
.option = stream_options,
};
const AVClass *av_stream_get_class(void)
{
return &stream_class;
}
AVStream *avformat_new_stream(AVFormatContext *s, const AVCodec *c)
{
FFFormatContext *const si = ffformatcontext(s);
FFStream *sti;
AVStream *st;
AVStream **streams;
if (s->nb_streams >= s->max_streams) {
av_log(s, AV_LOG_ERROR, "Number of streams exceeds max_streams parameter"
" (%d), see the documentation if you wish to increase it\n",
s->max_streams);
return NULL;
}
streams = av_realloc_array(s->streams, s->nb_streams + 1, sizeof(*streams));
if (!streams)
return NULL;
s->streams = streams;
sti = av_mallocz(sizeof(*sti));
if (!sti)
return NULL;
st = &sti->pub;
#if FF_API_AVSTREAM_CLASS
st->av_class = &stream_class;
#endif
st->codecpar = avcodec_parameters_alloc();
if (!st->codecpar)
goto fail;
sti->avctx = avcodec_alloc_context3(NULL);
if (!sti->avctx)
goto fail;
if (s->iformat) {
sti->info = av_mallocz(sizeof(*sti->info));
if (!sti->info)
goto fail;
#if FF_API_R_FRAME_RATE
sti->info->last_dts = AV_NOPTS_VALUE;
#endif
sti->info->fps_first_dts = AV_NOPTS_VALUE;
sti->info->fps_last_dts = AV_NOPTS_VALUE;
/* default pts setting is MPEG-like */
avpriv_set_pts_info(st, 33, 1, 90000);
/* we set the current DTS to 0 so that formats without any timestamps
* but durations get some timestamps, formats with some unknown
* timestamps have their first few packets buffered and the
* timestamps corrected before they are returned to the user */
sti->cur_dts = RELATIVE_TS_BASE;
} else {
sti->cur_dts = AV_NOPTS_VALUE;
}
st->index = s->nb_streams;
st->start_time = AV_NOPTS_VALUE;
st->duration = AV_NOPTS_VALUE;
sti->first_dts = AV_NOPTS_VALUE;
sti->probe_packets = s->max_probe_packets;
sti->pts_wrap_reference = AV_NOPTS_VALUE;
sti->pts_wrap_behavior = AV_PTS_WRAP_IGNORE;
sti->last_IP_pts = AV_NOPTS_VALUE;
sti->last_dts_for_order_check = AV_NOPTS_VALUE;
for (int i = 0; i < MAX_REORDER_DELAY + 1; i++)
sti->pts_buffer[i] = AV_NOPTS_VALUE;
st->sample_aspect_ratio = (AVRational) { 0, 1 };
sti->inject_global_side_data = si->inject_global_side_data;
sti->need_context_update = 1;
s->streams[s->nb_streams++] = st;
return st;
fail:
ff_free_stream(&st);
return NULL;
}
static int option_is_disposition(const AVOption *opt)
{
return opt->type == AV_OPT_TYPE_CONST &&
opt->unit && !strcmp(opt->unit, "disposition");
}
int av_disposition_from_string(const char *disp)
{
for (const AVOption *opt = stream_options; opt->name; opt++)
if (option_is_disposition(opt) && !strcmp(disp, opt->name))
return opt->default_val.i64;
return AVERROR(EINVAL);
}
const char *av_disposition_to_string(int disposition)
{
int val;
if (disposition <= 0)
return NULL;
val = 1 << ff_ctz(disposition);
for (const AVOption *opt = stream_options; opt->name; opt++)
if (option_is_disposition(opt) && opt->default_val.i64 == val)
return opt->name;
return NULL;
}
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