0,0 → 1,340 |
/* |
* Format register and lookup |
* 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 "libavutil/atomic.h" |
#include "libavutil/avstring.h" |
#include "libavutil/bprint.h" |
#include "libavutil/opt.h" |
|
#include "avio_internal.h" |
#include "avformat.h" |
#include "id3v2.h" |
#include "internal.h" |
|
|
/** |
* @file |
* Format register and lookup |
*/ |
/** head of registered input format linked list */ |
static AVInputFormat *first_iformat = NULL; |
/** head of registered output format linked list */ |
static AVOutputFormat *first_oformat = NULL; |
|
static AVInputFormat **last_iformat = &first_iformat; |
static AVOutputFormat **last_oformat = &first_oformat; |
|
AVInputFormat *av_iformat_next(const AVInputFormat *f) |
{ |
if (f) |
return f->next; |
else |
return first_iformat; |
} |
|
AVOutputFormat *av_oformat_next(const AVOutputFormat *f) |
{ |
if (f) |
return f->next; |
else |
return first_oformat; |
} |
|
void av_register_input_format(AVInputFormat *format) |
{ |
AVInputFormat **p = last_iformat; |
|
format->next = NULL; |
while(*p || avpriv_atomic_ptr_cas((void * volatile *)p, NULL, format)) |
p = &(*p)->next; |
last_iformat = &format->next; |
} |
|
void av_register_output_format(AVOutputFormat *format) |
{ |
AVOutputFormat **p = last_oformat; |
|
format->next = NULL; |
while(*p || avpriv_atomic_ptr_cas((void * volatile *)p, NULL, format)) |
p = &(*p)->next; |
last_oformat = &format->next; |
} |
|
int av_match_ext(const char *filename, const char *extensions) |
{ |
const char *ext; |
|
if (!filename) |
return 0; |
|
ext = strrchr(filename, '.'); |
if (ext) |
return av_match_name(ext + 1, extensions); |
return 0; |
} |
|
AVOutputFormat *av_guess_format(const char *short_name, const char *filename, |
const char *mime_type) |
{ |
AVOutputFormat *fmt = NULL, *fmt_found; |
int score_max, score; |
|
/* specific test for image sequences */ |
#if CONFIG_IMAGE2_MUXER |
if (!short_name && filename && |
av_filename_number_test(filename) && |
ff_guess_image2_codec(filename) != AV_CODEC_ID_NONE) { |
return av_guess_format("image2", NULL, NULL); |
} |
#endif |
/* Find the proper file type. */ |
fmt_found = NULL; |
score_max = 0; |
while ((fmt = av_oformat_next(fmt))) { |
score = 0; |
if (fmt->name && short_name && av_match_name(short_name, fmt->name)) |
score += 100; |
if (fmt->mime_type && mime_type && !strcmp(fmt->mime_type, mime_type)) |
score += 10; |
if (filename && fmt->extensions && |
av_match_ext(filename, fmt->extensions)) { |
score += 5; |
} |
if (score > score_max) { |
score_max = score; |
fmt_found = fmt; |
} |
} |
return fmt_found; |
} |
|
enum AVCodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name, |
const char *filename, const char *mime_type, |
enum AVMediaType type) |
{ |
if (av_match_name("segment", fmt->name) || av_match_name("ssegment", fmt->name)) { |
AVOutputFormat *fmt2 = av_guess_format(NULL, filename, NULL); |
if (fmt2) |
fmt = fmt2; |
} |
|
if (type == AVMEDIA_TYPE_VIDEO) { |
enum AVCodecID codec_id = AV_CODEC_ID_NONE; |
|
#if CONFIG_IMAGE2_MUXER |
if (!strcmp(fmt->name, "image2") || !strcmp(fmt->name, "image2pipe")) { |
codec_id = ff_guess_image2_codec(filename); |
} |
#endif |
if (codec_id == AV_CODEC_ID_NONE) |
codec_id = fmt->video_codec; |
return codec_id; |
} else if (type == AVMEDIA_TYPE_AUDIO) |
return fmt->audio_codec; |
else if (type == AVMEDIA_TYPE_SUBTITLE) |
return fmt->subtitle_codec; |
else if (type == AVMEDIA_TYPE_DATA) |
return fmt->data_codec; |
else |
return AV_CODEC_ID_NONE; |
} |
|
AVInputFormat *av_find_input_format(const char *short_name) |
{ |
AVInputFormat *fmt = NULL; |
while ((fmt = av_iformat_next(fmt))) |
if (av_match_name(short_name, fmt->name)) |
return fmt; |
return NULL; |
} |
|
AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened, |
int *score_ret) |
{ |
AVProbeData lpd = *pd; |
AVInputFormat *fmt1 = NULL, *fmt; |
int score, nodat = 0, score_max = 0; |
const static uint8_t zerobuffer[AVPROBE_PADDING_SIZE]; |
|
if (!lpd.buf) |
lpd.buf = zerobuffer; |
|
if (lpd.buf_size > 10 && ff_id3v2_match(lpd.buf, ID3v2_DEFAULT_MAGIC)) { |
int id3len = ff_id3v2_tag_len(lpd.buf); |
if (lpd.buf_size > id3len + 16) { |
lpd.buf += id3len; |
lpd.buf_size -= id3len; |
} else if (id3len >= PROBE_BUF_MAX) { |
nodat = 2; |
} else |
nodat = 1; |
} |
|
fmt = NULL; |
while ((fmt1 = av_iformat_next(fmt1))) { |
if (!is_opened == !(fmt1->flags & AVFMT_NOFILE) && strcmp(fmt1->name, "image2")) |
continue; |
score = 0; |
if (fmt1->read_probe) { |
score = fmt1->read_probe(&lpd); |
if (score) |
av_log(NULL, AV_LOG_TRACE, "Probing %s score:%d size:%d\n", fmt1->name, score, lpd.buf_size); |
if (fmt1->extensions && av_match_ext(lpd.filename, fmt1->extensions)) { |
if (nodat == 0) score = FFMAX(score, 1); |
else if (nodat == 1) score = FFMAX(score, AVPROBE_SCORE_EXTENSION / 2 - 1); |
else score = FFMAX(score, AVPROBE_SCORE_EXTENSION); |
} |
} else if (fmt1->extensions) { |
if (av_match_ext(lpd.filename, fmt1->extensions)) |
score = AVPROBE_SCORE_EXTENSION; |
} |
if (av_match_name(lpd.mime_type, fmt1->mime_type)) |
score = FFMAX(score, AVPROBE_SCORE_MIME); |
if (score > score_max) { |
score_max = score; |
fmt = fmt1; |
} else if (score == score_max) |
fmt = NULL; |
} |
if (nodat == 1) |
score_max = FFMIN(AVPROBE_SCORE_EXTENSION / 2 - 1, score_max); |
*score_ret = score_max; |
|
return fmt; |
} |
|
AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max) |
{ |
int score_ret; |
AVInputFormat *fmt = av_probe_input_format3(pd, is_opened, &score_ret); |
if (score_ret > *score_max) { |
*score_max = score_ret; |
return fmt; |
} else |
return NULL; |
} |
|
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened) |
{ |
int score = 0; |
return av_probe_input_format2(pd, is_opened, &score); |
} |
|
int av_probe_input_buffer2(AVIOContext *pb, AVInputFormat **fmt, |
const char *filename, void *logctx, |
unsigned int offset, unsigned int max_probe_size) |
{ |
AVProbeData pd = { filename ? filename : "" }; |
uint8_t *buf = NULL; |
int ret = 0, probe_size, buf_offset = 0; |
int score = 0; |
int ret2; |
|
if (!max_probe_size) |
max_probe_size = PROBE_BUF_MAX; |
else if (max_probe_size < PROBE_BUF_MIN) { |
av_log(logctx, AV_LOG_ERROR, |
"Specified probe size value %u cannot be < %u\n", max_probe_size, PROBE_BUF_MIN); |
return AVERROR(EINVAL); |
} |
|
if (offset >= max_probe_size) |
return AVERROR(EINVAL); |
|
if (pb->av_class) { |
uint8_t *mime_type_opt = NULL; |
av_opt_get(pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type_opt); |
pd.mime_type = (const char *)mime_type_opt; |
} |
#if 0 |
if (!*fmt && pb->av_class && av_opt_get(pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type) >= 0 && mime_type) { |
if (!av_strcasecmp(mime_type, "audio/aacp")) { |
*fmt = av_find_input_format("aac"); |
} |
av_freep(&mime_type); |
} |
#endif |
|
for (probe_size = PROBE_BUF_MIN; probe_size <= max_probe_size && !*fmt; |
probe_size = FFMIN(probe_size << 1, |
FFMAX(max_probe_size, probe_size + 1))) { |
score = probe_size < max_probe_size ? AVPROBE_SCORE_RETRY : 0; |
|
/* Read probe data. */ |
if ((ret = av_reallocp(&buf, probe_size + AVPROBE_PADDING_SIZE)) < 0) |
goto fail; |
if ((ret = avio_read(pb, buf + buf_offset, |
probe_size - buf_offset)) < 0) { |
/* Fail if error was not end of file, otherwise, lower score. */ |
if (ret != AVERROR_EOF) |
goto fail; |
|
score = 0; |
ret = 0; /* error was end of file, nothing read */ |
} |
buf_offset += ret; |
if (buf_offset < offset) |
continue; |
pd.buf_size = buf_offset - offset; |
pd.buf = &buf[offset]; |
|
memset(pd.buf + pd.buf_size, 0, AVPROBE_PADDING_SIZE); |
|
/* Guess file format. */ |
*fmt = av_probe_input_format2(&pd, 1, &score); |
if (*fmt) { |
/* This can only be true in the last iteration. */ |
if (score <= AVPROBE_SCORE_RETRY) { |
av_log(logctx, AV_LOG_WARNING, |
"Format %s detected only with low score of %d, " |
"misdetection possible!\n", (*fmt)->name, score); |
} else |
av_log(logctx, AV_LOG_DEBUG, |
"Format %s probed with size=%d and score=%d\n", |
(*fmt)->name, probe_size, score); |
#if 0 |
FILE *f = fopen("probestat.tmp", "ab"); |
fprintf(f, "probe_size:%d format:%s score:%d filename:%s\n", probe_size, (*fmt)->name, score, filename); |
fclose(f); |
#endif |
} |
} |
|
if (!*fmt) |
ret = AVERROR_INVALIDDATA; |
|
fail: |
/* Rewind. Reuse probe buffer to avoid seeking. */ |
ret2 = ffio_rewind_with_probe_data(pb, &buf, buf_offset); |
if (ret >= 0) |
ret = ret2; |
|
av_freep(&pd.mime_type); |
return ret < 0 ? ret : score; |
} |
|
int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt, |
const char *filename, void *logctx, |
unsigned int offset, unsigned int max_probe_size) |
{ |
int ret = av_probe_input_buffer2(pb, fmt, filename, logctx, offset, max_probe_size); |
return ret < 0 ? ret : 0; |
} |