mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
6d6ae3595b
Signed-off-by: James Almer <jamrial@gmail.com>
345 lines
11 KiB
C
345 lines
11 KiB
C
/*
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "avio_internal.h"
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#include "demux.h"
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#include "internal.h"
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#include "libavcodec/avcodec.h"
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#include "libavcodec/codec_par.h"
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#include "libavutil/avassert.h"
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#include "libavutil/internal.h"
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#include "libavutil/intmath.h"
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#include "libavutil/opt.h"
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/**
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* @file
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* Options definition for AVFormatContext.
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*/
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FF_DISABLE_DEPRECATION_WARNINGS
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#include "options_table.h"
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FF_ENABLE_DEPRECATION_WARNINGS
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static const char* format_to_name(void* ptr)
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{
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AVFormatContext* fc = (AVFormatContext*) ptr;
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if(fc->iformat) return fc->iformat->name;
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else if(fc->oformat) return fc->oformat->name;
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else return "NULL";
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}
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static void *format_child_next(void *obj, void *prev)
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{
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AVFormatContext *s = obj;
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if (!prev && s->priv_data &&
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((s->iformat && s->iformat->priv_class) ||
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s->oformat && s->oformat->priv_class))
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return s->priv_data;
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if (s->pb && s->pb->av_class && prev != s->pb)
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return s->pb;
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return NULL;
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}
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enum {
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CHILD_CLASS_ITER_AVIO = 0,
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CHILD_CLASS_ITER_MUX,
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CHILD_CLASS_ITER_DEMUX,
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CHILD_CLASS_ITER_DONE,
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};
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#define ITER_STATE_SHIFT 16
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static const AVClass *format_child_class_iterate(void **iter)
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{
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// we use the low 16 bits of iter as the value to be passed to
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// av_(de)muxer_iterate()
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void *val = (void*)(((uintptr_t)*iter) & ((1 << ITER_STATE_SHIFT) - 1));
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unsigned int state = ((uintptr_t)*iter) >> ITER_STATE_SHIFT;
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const AVClass *ret = NULL;
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if (state == CHILD_CLASS_ITER_AVIO) {
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ret = &ff_avio_class;
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state++;
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goto finish;
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}
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if (state == CHILD_CLASS_ITER_MUX) {
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const AVOutputFormat *ofmt;
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while ((ofmt = av_muxer_iterate(&val))) {
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ret = ofmt->priv_class;
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if (ret)
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goto finish;
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}
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val = NULL;
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state++;
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}
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if (state == CHILD_CLASS_ITER_DEMUX) {
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const AVInputFormat *ifmt;
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while ((ifmt = av_demuxer_iterate(&val))) {
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ret = ifmt->priv_class;
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if (ret)
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goto finish;
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}
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val = NULL;
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state++;
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}
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finish:
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// make sure none av_(de)muxer_iterate does not set the high bits of val
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av_assert0(!((uintptr_t)val >> ITER_STATE_SHIFT));
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*iter = (void*)((uintptr_t)val | (state << ITER_STATE_SHIFT));
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return ret;
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}
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static AVClassCategory get_category(void *ptr)
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{
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AVFormatContext* s = ptr;
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if(s->iformat) return AV_CLASS_CATEGORY_DEMUXER;
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else return AV_CLASS_CATEGORY_MUXER;
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}
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static const AVClass av_format_context_class = {
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.class_name = "AVFormatContext",
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.item_name = format_to_name,
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.option = avformat_options,
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.version = LIBAVUTIL_VERSION_INT,
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.child_next = format_child_next,
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.child_class_iterate = format_child_class_iterate,
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.category = AV_CLASS_CATEGORY_MUXER,
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.get_category = get_category,
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};
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static int io_open_default(AVFormatContext *s, AVIOContext **pb,
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const char *url, int flags, AVDictionary **options)
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{
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int loglevel;
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if (!strcmp(url, s->url) ||
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s->iformat && !strcmp(s->iformat->name, "image2") ||
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s->oformat && !strcmp(s->oformat->name, "image2")
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) {
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loglevel = AV_LOG_DEBUG;
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} else
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loglevel = AV_LOG_INFO;
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av_log(s, loglevel, "Opening \'%s\' for %s\n", url, flags & AVIO_FLAG_WRITE ? "writing" : "reading");
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return ffio_open_whitelist(pb, url, flags, &s->interrupt_callback, options, s->protocol_whitelist, s->protocol_blacklist);
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}
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void ff_format_io_close_default(AVFormatContext *s, AVIOContext *pb)
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{
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avio_close(pb);
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}
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static int io_close2_default(AVFormatContext *s, AVIOContext *pb)
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{
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return avio_close(pb);
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}
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AVFormatContext *avformat_alloc_context(void)
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{
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FFFormatContext *const si = av_mallocz(sizeof(*si));
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AVFormatContext *s;
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if (!si)
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return NULL;
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s = &si->pub;
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s->av_class = &av_format_context_class;
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s->io_open = io_open_default;
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s->io_close = ff_format_io_close_default;
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s->io_close2= io_close2_default;
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av_opt_set_defaults(s);
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si->pkt = av_packet_alloc();
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si->parse_pkt = av_packet_alloc();
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if (!si->pkt || !si->parse_pkt) {
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avformat_free_context(s);
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return NULL;
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}
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si->shortest_end = AV_NOPTS_VALUE;
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return s;
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}
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enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx)
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{
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return ctx->duration_estimation_method;
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}
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const AVClass *avformat_get_class(void)
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{
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return &av_format_context_class;
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}
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static const AVOption stream_options[] = {
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{ "disposition", NULL, offsetof(AVStream, disposition), AV_OPT_TYPE_FLAGS, { .i64 = 0 },
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.flags = AV_OPT_FLAG_ENCODING_PARAM, .unit = "disposition" },
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{ "default", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_DEFAULT }, .unit = "disposition" },
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{ "dub", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_DUB }, .unit = "disposition" },
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{ "original", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_ORIGINAL }, .unit = "disposition" },
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{ "comment", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_COMMENT }, .unit = "disposition" },
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{ "lyrics", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_LYRICS }, .unit = "disposition" },
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{ "karaoke", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_KARAOKE }, .unit = "disposition" },
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{ "forced", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_FORCED }, .unit = "disposition" },
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{ "hearing_impaired", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_HEARING_IMPAIRED }, .unit = "disposition" },
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{ "visual_impaired", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_VISUAL_IMPAIRED }, .unit = "disposition" },
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{ "clean_effects", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_CLEAN_EFFECTS }, .unit = "disposition" },
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{ "attached_pic", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_ATTACHED_PIC }, .unit = "disposition" },
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{ "timed_thumbnails", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_TIMED_THUMBNAILS }, .unit = "disposition" },
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{ "captions", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_CAPTIONS }, .unit = "disposition" },
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{ "descriptions", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_DESCRIPTIONS }, .unit = "disposition" },
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{ "metadata", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_METADATA }, .unit = "disposition" },
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{ "dependent", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_DEPENDENT }, .unit = "disposition" },
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{ "still_image", .type = AV_OPT_TYPE_CONST, { .i64 = AV_DISPOSITION_STILL_IMAGE }, .unit = "disposition" },
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{ NULL }
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};
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static const AVClass stream_class = {
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.class_name = "AVStream",
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.item_name = av_default_item_name,
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.version = LIBAVUTIL_VERSION_INT,
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.option = stream_options,
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};
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const AVClass *av_stream_get_class(void)
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{
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return &stream_class;
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}
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AVStream *avformat_new_stream(AVFormatContext *s, const AVCodec *c)
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{
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FFFormatContext *const si = ffformatcontext(s);
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FFStream *sti;
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AVStream *st;
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AVStream **streams;
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if (s->nb_streams >= s->max_streams) {
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av_log(s, AV_LOG_ERROR, "Number of streams exceeds max_streams parameter"
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" (%d), see the documentation if you wish to increase it\n",
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s->max_streams);
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return NULL;
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}
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streams = av_realloc_array(s->streams, s->nb_streams + 1, sizeof(*streams));
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if (!streams)
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return NULL;
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s->streams = streams;
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sti = av_mallocz(sizeof(*sti));
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if (!sti)
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return NULL;
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st = &sti->pub;
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st->av_class = &stream_class;
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st->codecpar = avcodec_parameters_alloc();
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if (!st->codecpar)
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goto fail;
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sti->avctx = avcodec_alloc_context3(NULL);
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if (!sti->avctx)
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goto fail;
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if (s->iformat) {
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sti->info = av_mallocz(sizeof(*sti->info));
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if (!sti->info)
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goto fail;
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#if FF_API_R_FRAME_RATE
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sti->info->last_dts = AV_NOPTS_VALUE;
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#endif
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sti->info->fps_first_dts = AV_NOPTS_VALUE;
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sti->info->fps_last_dts = AV_NOPTS_VALUE;
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/* default pts setting is MPEG-like */
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avpriv_set_pts_info(st, 33, 1, 90000);
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/* we set the current DTS to 0 so that formats without any timestamps
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* but durations get some timestamps, formats with some unknown
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* timestamps have their first few packets buffered and the
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* timestamps corrected before they are returned to the user */
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sti->cur_dts = RELATIVE_TS_BASE;
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} else {
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sti->cur_dts = AV_NOPTS_VALUE;
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}
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st->index = s->nb_streams;
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st->start_time = AV_NOPTS_VALUE;
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st->duration = AV_NOPTS_VALUE;
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sti->first_dts = AV_NOPTS_VALUE;
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sti->probe_packets = s->max_probe_packets;
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sti->pts_wrap_reference = AV_NOPTS_VALUE;
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sti->pts_wrap_behavior = AV_PTS_WRAP_IGNORE;
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sti->last_IP_pts = AV_NOPTS_VALUE;
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sti->last_dts_for_order_check = AV_NOPTS_VALUE;
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for (int i = 0; i < MAX_REORDER_DELAY + 1; i++)
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sti->pts_buffer[i] = AV_NOPTS_VALUE;
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st->sample_aspect_ratio = (AVRational) { 0, 1 };
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sti->inject_global_side_data = si->inject_global_side_data;
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sti->need_context_update = 1;
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s->streams[s->nb_streams++] = st;
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return st;
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fail:
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ff_free_stream(&st);
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return NULL;
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}
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static int option_is_disposition(const AVOption *opt)
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{
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return opt->type == AV_OPT_TYPE_CONST &&
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opt->unit && !strcmp(opt->unit, "disposition");
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}
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int av_disposition_from_string(const char *disp)
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{
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for (const AVOption *opt = stream_options; opt->name; opt++)
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if (option_is_disposition(opt) && !strcmp(disp, opt->name))
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return opt->default_val.i64;
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return AVERROR(EINVAL);
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}
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const char *av_disposition_to_string(int disposition)
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{
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int val;
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if (disposition <= 0)
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return NULL;
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val = 1 << ff_ctz(disposition);
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for (const AVOption *opt = stream_options; opt->name; opt++)
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if (option_is_disposition(opt) && opt->default_val.i64 == val)
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return opt->name;
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return NULL;
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}
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