* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include "libavutil/avstring.h"
+#include "libavutil/opt.h"
+
+#include "avio_internal.h"
#include "avformat.h"
+#include "id3v2.h"
#include "internal.h"
-#include "libavutil/avstring.h"
/**
* @file
/** head of registered output format linked list */
static AVOutputFormat *first_oformat = NULL;
-AVInputFormat *av_iformat_next(AVInputFormat *f)
+AVInputFormat *av_iformat_next(const AVInputFormat *f)
{
if (f)
return f->next;
return first_iformat;
}
-AVOutputFormat *av_oformat_next(AVOutputFormat *f)
+AVOutputFormat *av_oformat_next(const AVOutputFormat *f)
{
if (f)
return f->next;
{
AVInputFormat **p = &first_iformat;
- while (*p != NULL)
+ while (*p)
p = &(*p)->next;
*p = format;
{
AVOutputFormat **p = &first_oformat;
- while (*p != NULL)
+ while (*p)
p = &(*p)->next;
*p = format;
return 0;
}
-static int match_format(const char *name, const char *names)
-{
- const char *p;
- int len, namelen;
-
- if (!name || !names)
- return 0;
-
- namelen = strlen(name);
- while ((p = strchr(names, ','))) {
- len = FFMAX(p - names, namelen);
- if (!av_strncasecmp(name, names, len))
- return 1;
- names = p + 1;
- }
- return !av_strcasecmp(name, names);
-}
-
AVOutputFormat *av_guess_format(const char *short_name, const char *filename,
const char *mime_type)
{
{
AVInputFormat *fmt = NULL;
while ((fmt = av_iformat_next(fmt)))
- if (match_format(short_name, fmt->name))
+ if (av_match_name(short_name, fmt->name))
return fmt;
return NULL;
}
+
+AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened,
+ int *score_max)
+{
+ AVProbeData lpd = *pd;
+ AVInputFormat *fmt1 = NULL, *fmt;
+ int score, id3 = 0;
+
+ 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;
+ }
+
+ fmt = NULL;
+ while ((fmt1 = av_iformat_next(fmt1))) {
+ if (!is_opened == !(fmt1->flags & AVFMT_NOFILE))
+ continue;
+ score = 0;
+ if (fmt1->read_probe) {
+ score = fmt1->read_probe(&lpd);
+ } 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;
+ }
+
+ // 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;
+ }
+ }
+
+ return fmt;
+}
+
+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,
+ 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_opt = NULL;
+
+ 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)
+ 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, &mime_type_opt);
+ pd.mime_type = (const char *)mime_type_opt;
+ mime_type_opt = NULL;
+ }
+ 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;
+
+ /* 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) {
+ /* 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;
+
+ 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_MAX / 4) {
+ av_log(logctx, AV_LOG_WARNING,
+ "Format detected only with low score of %d, "
+ "misdetection possible!\n", score);
+ } else
+ av_log(logctx, AV_LOG_DEBUG,
+ "Probed with size=%d and score=%d\n", probe_size, score);
+ }
+ }
+
+ if (!*fmt)
+ ret = AVERROR_INVALIDDATA;
+
+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);
+ }
+ av_freep(&pd.mime_type);
+ return ret;
+}
projects / ffmpeg / blobdiff