* Format register and lookup
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * 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 "id3v2.h"
#include "internal.h"
+
/**
* @file
* Format register and lookup
/** 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)
void av_register_input_format(AVInputFormat *format)
{
- AVInputFormat **p = &first_iformat;
-
- while (*p != NULL)
- p = &(*p)->next;
+ AVInputFormat **p = last_iformat;
- *p = format;
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 = &first_oformat;
-
- while (*p != NULL)
- p = &(*p)->next;
+ AVOutputFormat **p = last_oformat;
- *p = format;
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)
score_max = 0;
while ((fmt = av_oformat_next(fmt))) {
score = 0;
- if (fmt->name && short_name && !av_strcasecmp(fmt->name, short_name))
+ 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;
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;
return NULL;
}
-AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened,
- int *score_max)
+AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened,
+ int *score_ret)
{
AVProbeData lpd = *pd;
AVInputFormat *fmt1 = NULL, *fmt;
- int score, id3 = 0;
+ 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;
- }
- id3 = 1;
+ } else if (id3len >= PROBE_BUF_MAX) {
+ nodat = 2;
+ } else
+ nodat = 1;
}
fmt = NULL;
score = 0;
if (fmt1->read_probe) {
score = fmt1->read_probe(&lpd);
+ 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_EXTENSION);
- if (score > *score_max) {
- *score_max = score;
- fmt = fmt1;
- } else if (score == *score_max)
+ if (score > score_max) {
+ score_max = score;
+ fmt = fmt1;
+ } else if (score == score_max)
fmt = NULL;
}
-
- // A hack for files with huge id3v2 tags -- try to guess by file extension.
- if (!fmt && is_opened && *score_max < AVPROBE_SCORE_EXTENSION / 2) {
- while ((fmt = av_iformat_next(fmt)))
- if (fmt->extensions &&
- av_match_ext(lpd.filename, fmt->extensions)) {
- *score_max = AVPROBE_SCORE_EXTENSION / 2;
- break;
- }
- }
-
- if (!fmt && id3 && *score_max < AVPROBE_SCORE_EXTENSION / 2 - 1) {
- while ((fmt = av_iformat_next(fmt)))
- if (fmt->extensions && av_match_ext("mp3", fmt->extensions)) {
- *score_max = AVPROBE_SCORE_EXTENSION / 2 - 1;
- break;
- }
- }
+ 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);
}
-/* size of probe buffer, for guessing file type from file contents */
-#define PROBE_BUF_MIN 2048
-#define PROBE_BUF_MAX (1 << 20)
-
-int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
+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;
+ uint8_t *mime_type;
+ 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_MAX)
- max_probe_size = PROBE_BUF_MAX;
- else if (max_probe_size < PROBE_BUF_MIN)
+ 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);
- avio_skip(pb, offset);
- max_probe_size -= offset;
+
if (pb->av_class)
av_opt_get(pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &pd.mime_type);
+#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))) {
- int score = probe_size < max_probe_size ? AVPROBE_SCORE_MAX / 4 : 0;
+ 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 + pd.buf_size,
- probe_size - pd.buf_size)) < 0) {
+ 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 */
}
- pd.buf_size += ret;
- pd.buf = buf;
+ 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);
*fmt = av_probe_input_format2(&pd, 1, &score);
if (*fmt) {
/* This can only be true in the last iteration. */
- if (score <= AVPROBE_SCORE_MAX / 4) {
+ if (score <= AVPROBE_SCORE_RETRY) {
av_log(logctx, AV_LOG_WARNING,
- "Format detected only with low score of %d, "
- "misdetection possible!\n", score);
+ "Format %s detected only with low score of %d, "
+ "misdetection possible!\n", (*fmt)->name, score);
} else
av_log(logctx, AV_LOG_DEBUG,
- "Probed with size=%d and score=%d\n", probe_size, score);
+ "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
}
}
fail:
/* Rewind. Reuse probe buffer to avoid seeking. */
- if (ret < 0 ||
- (ret = ffio_rewind_with_probe_data(pb, buf, pd.buf_size)) < 0) {
- av_free(buf);
- }
+ ret2 = ffio_rewind_with_probe_data(pb, &buf, buf_offset);
+ if (ret >= 0)
+ ret = ret2;
+
av_free(pd.mime_type);
- return ret;
+ 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;
}
projects / ffmpeg / blobdiff