[FFmpeg-cvslog] avformat/vorbiscomment: Switch to AVIOContext from bytestream API
Andreas Rheinhardt
git at videolan.org
Sun May 3 14:56:00 EEST 2020
ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at gmail.com> | Tue Apr 28 04:54:05 2020 +0200| [6397b4d6a241692a1c7bb611a3fd42b0de2d32b5] | committer: Andreas Rheinhardt
avformat/vorbiscomment: Switch to AVIOContext from bytestream API
Up until now ff_vorbiscomment_write() used the bytestream API to write
VorbisComments. Therefore the caller had to provide a sufficiently large
buffer to write the output.
Yet two of the three callers (namely the FLAC and the Matroska muxer)
actually want the output to be written via an AVIOContext; therefore
they allocated buffers of the right size just for this purpose (i.e.
they get freed immediately afterwards). Only the Ogg muxer actually
wants a buffer. But given that it is easy to wrap a buffer into an
AVIOContext this commit changes ff_vorbiscomment_write() to use an
AVIOContext for its output.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6397b4d6a241692a1c7bb611a3fd42b0de2d32b5
---
libavformat/flacenc.c | 18 ++++--------------
libavformat/matroskaenc.c | 18 ++++--------------
libavformat/oggenc.c | 12 ++++++------
libavformat/vorbiscomment.c | 44 ++++++++++++++++++++++----------------------
libavformat/vorbiscomment.h | 9 ++++-----
5 files changed, 40 insertions(+), 61 deletions(-)
diff --git a/libavformat/flacenc.c b/libavformat/flacenc.c
index 0e88e18355..b947a3b067 100644
--- a/libavformat/flacenc.c
+++ b/libavformat/flacenc.c
@@ -29,7 +29,6 @@
#include "id3v2.h"
#include "internal.h"
#include "vorbiscomment.h"
-#include "libavcodec/bytestream.h"
typedef struct FlacMuxerContext {
@@ -62,25 +61,16 @@ static int flac_write_block_comment(AVIOContext *pb, AVDictionary **m,
{
const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
int64_t len;
- uint8_t *p, *p0;
ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
len = ff_vorbiscomment_length(*m, vendor, NULL, 0);
if (len >= ((1<<24) - 4))
return AVERROR(EINVAL);
- p0 = av_malloc(len+4);
- if (!p0)
- return AVERROR(ENOMEM);
- p = p0;
-
- bytestream_put_byte(&p, last_block ? 0x84 : 0x04);
- bytestream_put_be24(&p, len);
- ff_vorbiscomment_write(&p, *m, vendor, NULL, 0);
-
- avio_write(pb, p0, len+4);
- av_freep(&p0);
- p = NULL;
+
+ avio_w8(pb, last_block ? 0x84 : 0x04);
+ avio_wb24(pb, len);
+ ff_vorbiscomment_write(pb, *m, vendor, NULL, 0);
return 0;
}
diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 80ff341a90..c07aa4f7e4 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -624,7 +624,7 @@ static int put_flac_codecpriv(AVFormatContext *s, AVIOContext *pb,
const char *vendor = (s->flags & AVFMT_FLAG_BITEXACT) ?
"Lavf" : LIBAVFORMAT_IDENT;
AVDictionary *dict = NULL;
- uint8_t buf[32], *data, *p;
+ uint8_t buf[32];
int64_t len;
snprintf(buf, sizeof(buf), "0x%"PRIx64, par->channel_layout);
@@ -633,21 +633,11 @@ static int put_flac_codecpriv(AVFormatContext *s, AVIOContext *pb,
len = ff_vorbiscomment_length(dict, vendor, NULL, 0);
av_assert1(len < (1 << 24) - 4);
- data = av_malloc(len + 4);
- if (!data) {
- av_dict_free(&dict);
- return AVERROR(ENOMEM);
- }
-
- data[0] = 0x84;
- AV_WB24(data + 1, len);
-
- p = data + 4;
- ff_vorbiscomment_write(&p, dict, vendor, NULL, 0);
+ avio_w8(pb, 0x84);
+ avio_wb24(pb, len);
- avio_write(pb, data, len + 4);
+ ff_vorbiscomment_write(pb, dict, vendor, NULL, 0);
- av_freep(&data);
av_dict_free(&dict);
}
diff --git a/libavformat/oggenc.c b/libavformat/oggenc.c
index cc9a899a4c..3aff3c7a08 100644
--- a/libavformat/oggenc.c
+++ b/libavformat/oggenc.c
@@ -294,8 +294,9 @@ static uint8_t *ogg_write_vorbiscomment(int64_t offset, int bitexact,
AVChapter **chapters, unsigned int nb_chapters)
{
const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
+ AVIOContext pb;
int64_t size;
- uint8_t *p, *p0;
+ uint8_t *p;
ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
@@ -305,15 +306,14 @@ static uint8_t *ogg_write_vorbiscomment(int64_t offset, int bitexact,
p = av_mallocz(size);
if (!p)
return NULL;
- p0 = p;
- p += offset;
- ff_vorbiscomment_write(&p, *m, vendor, chapters, nb_chapters);
+ ffio_init_context(&pb, p + offset, size - offset, 1, NULL, NULL, NULL, NULL);
+ ff_vorbiscomment_write(&pb, *m, vendor, chapters, nb_chapters);
if (framing_bit)
- bytestream_put_byte(&p, 1);
+ avio_w8(&pb, 1);
*header_len = size;
- return p0;
+ return p;
}
static int ogg_build_flac_headers(AVCodecParameters *par,
diff --git a/libavformat/vorbiscomment.c b/libavformat/vorbiscomment.c
index edaeae2772..a929634cc0 100644
--- a/libavformat/vorbiscomment.c
+++ b/libavformat/vorbiscomment.c
@@ -19,10 +19,10 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include "avio.h"
#include "avformat.h"
#include "metadata.h"
#include "vorbiscomment.h"
-#include "libavcodec/bytestream.h"
#include "libavutil/dict.h"
/**
@@ -62,13 +62,13 @@ int64_t ff_vorbiscomment_length(const AVDictionary *m, const char *vendor_string
return len;
}
-int ff_vorbiscomment_write(uint8_t **p, const AVDictionary *m,
+int ff_vorbiscomment_write(AVIOContext *pb, const AVDictionary *m,
const char *vendor_string,
AVChapter **chapters, unsigned int nb_chapters)
{
int cm_count = 0;
- bytestream_put_le32(p, strlen(vendor_string));
- bytestream_put_buffer(p, vendor_string, strlen(vendor_string));
+ avio_wl32(pb, strlen(vendor_string));
+ avio_write(pb, vendor_string, strlen(vendor_string));
if (chapters && nb_chapters) {
for (int i = 0; i < nb_chapters; i++) {
cm_count += av_dict_count(chapters[i]->metadata) + 1;
@@ -77,16 +77,16 @@ int ff_vorbiscomment_write(uint8_t **p, const AVDictionary *m,
if (m) {
int count = av_dict_count(m) + cm_count;
AVDictionaryEntry *tag = NULL;
- bytestream_put_le32(p, count);
+ avio_wl32(pb, count);
while ((tag = av_dict_get(m, "", tag, AV_DICT_IGNORE_SUFFIX))) {
int64_t len1 = strlen(tag->key);
int64_t len2 = strlen(tag->value);
if (len1+1+len2 > UINT32_MAX)
return AVERROR(EINVAL);
- bytestream_put_le32(p, len1+1+len2);
- bytestream_put_buffer(p, tag->key, len1);
- bytestream_put_byte(p, '=');
- bytestream_put_buffer(p, tag->value, len2);
+ avio_wl32(pb, len1 + 1 + len2);
+ avio_write(pb, tag->key, len1);
+ avio_w8(pb, '=');
+ avio_write(pb, tag->value, len2);
}
for (int i = 0; i < nb_chapters; i++) {
AVChapter *chp = chapters[i];
@@ -101,11 +101,11 @@ int ff_vorbiscomment_write(uint8_t **p, const AVDictionary *m,
s = s % 60;
snprintf(chapter_number, sizeof(chapter_number), "%03d", i);
snprintf(chapter_time, sizeof(chapter_time), "%02d:%02d:%02d.%03d", h, m, s, ms);
- bytestream_put_le32(p, 10+1+12);
- bytestream_put_buffer(p, "CHAPTER", 7);
- bytestream_put_buffer(p, chapter_number, 3);
- bytestream_put_byte(p, '=');
- bytestream_put_buffer(p, chapter_time, 12);
+ avio_wl32(pb, 10 + 1 + 12);
+ avio_write(pb, "CHAPTER", 7);
+ avio_write(pb, chapter_number, 3);
+ avio_w8(pb, '=');
+ avio_write(pb, chapter_time, 12);
tag = NULL;
while ((tag = av_dict_get(chapters[i]->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
@@ -113,18 +113,18 @@ int ff_vorbiscomment_write(uint8_t **p, const AVDictionary *m,
int64_t len2 = strlen(tag->value);
if (len1+1+len2+10 > UINT32_MAX)
return AVERROR(EINVAL);
- bytestream_put_le32(p, 10+len1+1+len2);
- bytestream_put_buffer(p, "CHAPTER", 7);
- bytestream_put_buffer(p, chapter_number, 3);
+ avio_wl32(pb, 10 + len1 + 1 + len2);
+ avio_write(pb, "CHAPTER", 7);
+ avio_write(pb, chapter_number, 3);
if (!strcmp(tag->key, "title"))
- bytestream_put_buffer(p, "NAME", 4);
+ avio_write(pb, "NAME", 4);
else
- bytestream_put_buffer(p, tag->key, len1);
- bytestream_put_byte(p, '=');
- bytestream_put_buffer(p, tag->value, len2);
+ avio_write(pb, tag->key, len1);
+ avio_w8(pb, '=');
+ avio_write(pb, tag->value, len2);
}
}
} else
- bytestream_put_le32(p, 0);
+ avio_wl32(pb, 0);
return 0;
}
diff --git a/libavformat/vorbiscomment.h b/libavformat/vorbiscomment.h
index af9bd75cd7..7cacd0b2a0 100644
--- a/libavformat/vorbiscomment.h
+++ b/libavformat/vorbiscomment.h
@@ -38,18 +38,17 @@ int64_t ff_vorbiscomment_length(const AVDictionary *m, const char *vendor_string
AVChapter **chapters, unsigned int nb_chapters);
/**
- * Write a VorbisComment into a buffer. The buffer, p, must have enough
- * data to hold the whole VorbisComment. The minimum size required can be
- * obtained by passing the same AVDictionary and vendor_string to
+ * Write a VorbisComment into an AVIOContext. The output size can be obtained
+ * in advance by passing the same chapters, AVDictionary and vendor_string to
* ff_vorbiscomment_length()
*
- * @param p The buffer in which to write.
+ * @param pb The AVIOContext to write the output.
* @param m The metadata struct to write.
* @param vendor_string The vendor string to write.
* @param chapters The chapters to write.
* @param nb_chapters The number of chapters to write.
*/
-int ff_vorbiscomment_write(uint8_t **p, const AVDictionary *m,
+int ff_vorbiscomment_write(AVIOContext *pb, const AVDictionary *m,
const char *vendor_string,
AVChapter **chapters, unsigned int nb_chapters);
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