Merge commit 'e253a9e2b3d683eb51db7c776326eb07de10ad4c'

* commit 'e253a9e2b3d683eb51db7c776326eb07de10ad4c':
  avformat: Move av_probe_input* to format.c

Conflicts:
	libavformat/format.c
	libavformat/utils.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 167 insertions, 1 deletions

diff --git a/libavformat/format.c b/libavformat/format.c
index 5545d07979..e2eeb6ff09 100644
--- a/libavformat/format.c
+++ b/libavformat/format.c
@@ -19,10 +19,15 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "libavutil/avstring.h"
+
+#include "avio_internal.h"
 #include "avformat.h"
+#include "id3v2.h"
 #include "internal.h"
 #include "libavutil/atomic.h"
-#include "libavutil/avstring.h"
+#include "libavutil/bprint.h"
+#include "libavutil/opt.h"
 
 /**
  * @file
@@ -187,3 +192,164 @@ AVInputFormat *av_find_input_format(const char *short_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))
+            continue;
+        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 (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;
+    uint8_t *mime_type;
+    int ret = 0, probe_size, buf_offset = 0;
+    int score = 0;
+
+    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 (!*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);
+    }
+
+    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)
+            return ret;
+        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) {
+                av_free(buf);
+                return ret;
+            }
+            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) {
+        av_free(buf);
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* Rewind. Reuse probe buffer to avoid seeking. */
+    ret = ffio_rewind_with_probe_data(pb, &buf, buf_offset);
+
+    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;
+}