313 lines
9.1 KiB
C
313 lines
9.1 KiB
C
/*
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* Format register and lookup
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "libavutil/avstring.h"
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#include "libavutil/opt.h"
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#include "avio_internal.h"
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#include "avformat.h"
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#include "id3v2.h"
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#include "internal.h"
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/**
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* @file
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* Format register and lookup
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*/
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/** head of registered input format linked list */
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static AVInputFormat *first_iformat = NULL;
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/** head of registered output format linked list */
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static AVOutputFormat *first_oformat = NULL;
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AVInputFormat *av_iformat_next(const AVInputFormat *f)
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{
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if (f)
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return f->next;
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else
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return first_iformat;
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}
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AVOutputFormat *av_oformat_next(const AVOutputFormat *f)
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{
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if (f)
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return f->next;
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else
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return first_oformat;
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}
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void av_register_input_format(AVInputFormat *format)
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{
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AVInputFormat **p = &first_iformat;
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while (*p != NULL)
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p = &(*p)->next;
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*p = format;
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format->next = NULL;
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}
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void av_register_output_format(AVOutputFormat *format)
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{
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AVOutputFormat **p = &first_oformat;
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while (*p != NULL)
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p = &(*p)->next;
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*p = format;
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format->next = NULL;
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}
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int av_match_ext(const char *filename, const char *extensions)
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{
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const char *ext, *p;
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char ext1[32], *q;
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if (!filename)
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return 0;
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ext = strrchr(filename, '.');
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if (ext) {
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ext++;
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p = extensions;
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for (;;) {
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q = ext1;
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while (*p != '\0' && *p != ',' && q - ext1 < sizeof(ext1) - 1)
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*q++ = *p++;
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*q = '\0';
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if (!av_strcasecmp(ext1, ext))
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return 1;
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if (*p == '\0')
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break;
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p++;
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}
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}
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return 0;
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}
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AVOutputFormat *av_guess_format(const char *short_name, const char *filename,
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const char *mime_type)
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{
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AVOutputFormat *fmt = NULL, *fmt_found;
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int score_max, score;
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/* specific test for image sequences */
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#if CONFIG_IMAGE2_MUXER
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if (!short_name && filename &&
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av_filename_number_test(filename) &&
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ff_guess_image2_codec(filename) != AV_CODEC_ID_NONE) {
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return av_guess_format("image2", NULL, NULL);
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}
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#endif
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/* Find the proper file type. */
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fmt_found = NULL;
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score_max = 0;
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while ((fmt = av_oformat_next(fmt))) {
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score = 0;
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if (fmt->name && short_name && !av_strcasecmp(fmt->name, short_name))
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score += 100;
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if (fmt->mime_type && mime_type && !strcmp(fmt->mime_type, mime_type))
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score += 10;
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if (filename && fmt->extensions &&
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av_match_ext(filename, fmt->extensions)) {
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score += 5;
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}
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if (score > score_max) {
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score_max = score;
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fmt_found = fmt;
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}
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}
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return fmt_found;
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}
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enum AVCodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
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const char *filename, const char *mime_type,
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enum AVMediaType type)
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{
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if (type == AVMEDIA_TYPE_VIDEO) {
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enum AVCodecID codec_id = AV_CODEC_ID_NONE;
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#if CONFIG_IMAGE2_MUXER
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if (!strcmp(fmt->name, "image2") || !strcmp(fmt->name, "image2pipe")) {
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codec_id = ff_guess_image2_codec(filename);
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}
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#endif
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if (codec_id == AV_CODEC_ID_NONE)
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codec_id = fmt->video_codec;
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return codec_id;
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} else if (type == AVMEDIA_TYPE_AUDIO)
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return fmt->audio_codec;
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else if (type == AVMEDIA_TYPE_SUBTITLE)
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return fmt->subtitle_codec;
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else
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return AV_CODEC_ID_NONE;
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}
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AVInputFormat *av_find_input_format(const char *short_name)
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{
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AVInputFormat *fmt = NULL;
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while ((fmt = av_iformat_next(fmt)))
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if (av_match_name(short_name, fmt->name))
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return fmt;
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return NULL;
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}
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AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened,
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int *score_max)
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{
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AVProbeData lpd = *pd;
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AVInputFormat *fmt1 = NULL, *fmt;
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int score, id3 = 0;
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if (lpd.buf_size > 10 && ff_id3v2_match(lpd.buf, ID3v2_DEFAULT_MAGIC)) {
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int id3len = ff_id3v2_tag_len(lpd.buf);
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if (lpd.buf_size > id3len + 16) {
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lpd.buf += id3len;
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lpd.buf_size -= id3len;
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}
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id3 = 1;
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}
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fmt = NULL;
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while ((fmt1 = av_iformat_next(fmt1))) {
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if (!is_opened == !(fmt1->flags & AVFMT_NOFILE))
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continue;
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score = 0;
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if (fmt1->read_probe) {
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score = fmt1->read_probe(&lpd);
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} else if (fmt1->extensions) {
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if (av_match_ext(lpd.filename, fmt1->extensions))
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score = AVPROBE_SCORE_EXTENSION;
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}
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#ifdef FF_API_PROBE_MIME
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if (av_match_name(lpd.mime_type, fmt1->mime_type))
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score = FFMAX(score, AVPROBE_SCORE_EXTENSION);
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#endif
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if (score > *score_max) {
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*score_max = score;
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fmt = fmt1;
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} else if (score == *score_max)
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fmt = NULL;
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}
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// A hack for files with huge id3v2 tags -- try to guess by file extension.
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if (!fmt && is_opened && *score_max < AVPROBE_SCORE_EXTENSION / 2) {
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while ((fmt = av_iformat_next(fmt)))
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if (fmt->extensions &&
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av_match_ext(lpd.filename, fmt->extensions)) {
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*score_max = AVPROBE_SCORE_EXTENSION / 2;
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break;
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}
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}
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if (!fmt && id3 && *score_max < AVPROBE_SCORE_EXTENSION / 2 - 1) {
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while ((fmt = av_iformat_next(fmt)))
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if (fmt->extensions && av_match_ext("mp3", fmt->extensions)) {
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*score_max = AVPROBE_SCORE_EXTENSION / 2 - 1;
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break;
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}
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}
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return fmt;
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}
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AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened)
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{
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int score = 0;
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return av_probe_input_format2(pd, is_opened, &score);
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}
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/* size of probe buffer, for guessing file type from file contents */
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#define PROBE_BUF_MIN 2048
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#define PROBE_BUF_MAX (1 << 20)
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int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
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const char *filename, void *logctx,
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unsigned int offset, unsigned int max_probe_size)
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{
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AVProbeData pd = { filename ? filename : "" };
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uint8_t *buf = NULL;
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int ret = 0, probe_size;
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if (!max_probe_size)
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max_probe_size = PROBE_BUF_MAX;
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else if (max_probe_size > PROBE_BUF_MAX)
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max_probe_size = PROBE_BUF_MAX;
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else if (max_probe_size < PROBE_BUF_MIN)
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return AVERROR(EINVAL);
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if (offset >= max_probe_size)
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return AVERROR(EINVAL);
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avio_skip(pb, offset);
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max_probe_size -= offset;
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#ifdef FF_API_PROBE_MIME
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if (pb->av_class)
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av_opt_get(pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &pd.mime_type);
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#endif
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for (probe_size = PROBE_BUF_MIN; probe_size <= max_probe_size && !*fmt;
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probe_size = FFMIN(probe_size << 1,
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FFMAX(max_probe_size, probe_size + 1))) {
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int score = probe_size < max_probe_size ? AVPROBE_SCORE_MAX / 4 : 0;
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/* Read probe data. */
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if ((ret = av_reallocp(&buf, probe_size + AVPROBE_PADDING_SIZE)) < 0)
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goto fail;
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if ((ret = avio_read(pb, buf + pd.buf_size,
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probe_size - pd.buf_size)) < 0) {
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/* Fail if error was not end of file, otherwise, lower score. */
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if (ret != AVERROR_EOF)
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goto fail;
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score = 0;
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ret = 0; /* error was end of file, nothing read */
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}
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pd.buf_size += ret;
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pd.buf = buf;
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memset(pd.buf + pd.buf_size, 0, AVPROBE_PADDING_SIZE);
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/* Guess file format. */
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*fmt = av_probe_input_format2(&pd, 1, &score);
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if (*fmt) {
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/* This can only be true in the last iteration. */
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if (score <= AVPROBE_SCORE_MAX / 4) {
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av_log(logctx, AV_LOG_WARNING,
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"Format detected only with low score of %d, "
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"misdetection possible!\n", score);
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} else
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av_log(logctx, AV_LOG_DEBUG,
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"Probed with size=%d and score=%d\n", probe_size, score);
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}
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}
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if (!*fmt)
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ret = AVERROR_INVALIDDATA;
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fail:
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/* Rewind. Reuse probe buffer to avoid seeking. */
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if (ret < 0 ||
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(ret = ffio_rewind_with_probe_data(pb, buf, pd.buf_size)) < 0) {
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av_free(buf);
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}
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#ifdef FF_API_PROBE_MIME
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av_free(pd.mime_type);
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#endif
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return ret;
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}
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