mirror of https://github.com/FFmpeg/FFmpeg.git
Luca Barbato
12 years ago
parent
f80b60ad59
commit
afc8685395
3 changed files with 184 additions and 146 deletions
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/*
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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 "avformat.h" |
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#include "internal.h" |
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#include "libavutil/avstring.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(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(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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static int match_format(const char *name, const char *names) |
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{ |
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const char *p; |
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int len, namelen; |
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if (!name || !names) |
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return 0; |
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namelen = strlen(name); |
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while ((p = strchr(names, ','))) { |
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len = FFMAX(p - names, namelen); |
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if (!av_strncasecmp(name, names, len)) |
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return 1; |
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names = p + 1; |
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} |
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return !av_strcasecmp(name, names); |
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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 (match_format(short_name, fmt->name)) |
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return fmt; |
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return NULL; |
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} |
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