Add m-esr52 at 52.6.0

1 files changed, 153 insertions, 0 deletions

diff --git a/media/ffvpx/libavcodec/flac.h b/media/ffvpx/libavcodec/flac.h
new file mode 100644
index 000000000..96d971c9d
--- /dev/null
+++ b/media/ffvpx/libavcodec/flac.h
@@ -0,0 +1,153 @@
+/*
+ * FLAC (Free Lossless Audio Codec) decoder/demuxer common functions
+ * Copyright (c) 2008 Justin Ruggles
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * FLAC (Free Lossless Audio Codec) decoder/demuxer common functions
+ */
+
+#ifndef AVCODEC_FLAC_H
+#define AVCODEC_FLAC_H
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "get_bits.h"
+
+#define FLAC_STREAMINFO_SIZE   34
+#define FLAC_MAX_CHANNELS       8
+#define FLAC_MIN_BLOCKSIZE     16
+#define FLAC_MAX_BLOCKSIZE  65535
+#define FLAC_MIN_FRAME_SIZE    11
+
+enum {
+    FLAC_CHMODE_INDEPENDENT = 0,
+    FLAC_CHMODE_LEFT_SIDE   = 1,
+    FLAC_CHMODE_RIGHT_SIDE  = 2,
+    FLAC_CHMODE_MID_SIDE    = 3,
+};
+
+enum {
+    FLAC_METADATA_TYPE_STREAMINFO = 0,
+    FLAC_METADATA_TYPE_PADDING,
+    FLAC_METADATA_TYPE_APPLICATION,
+    FLAC_METADATA_TYPE_SEEKTABLE,
+    FLAC_METADATA_TYPE_VORBIS_COMMENT,
+    FLAC_METADATA_TYPE_CUESHEET,
+    FLAC_METADATA_TYPE_PICTURE,
+    FLAC_METADATA_TYPE_INVALID = 127
+};
+
+enum FLACExtradataFormat {
+    FLAC_EXTRADATA_FORMAT_STREAMINFO  = 0,
+    FLAC_EXTRADATA_FORMAT_FULL_HEADER = 1
+};
+
+#define FLACCOMMONINFO \
+    int samplerate;         /**< sample rate                             */\
+    int channels;           /**< number of channels                      */\
+    int bps;                /**< bits-per-sample                         */\
+
+/**
+ * Data needed from the Streaminfo header for use by the raw FLAC demuxer
+ * and/or the FLAC decoder.
+ */
+#define FLACSTREAMINFO \
+    FLACCOMMONINFO \
+    int max_blocksize;      /**< maximum block size, in samples          */\
+    int max_framesize;      /**< maximum frame size, in bytes            */\
+    int64_t samples;        /**< total number of samples                 */\
+
+typedef struct FLACStreaminfo {
+    FLACSTREAMINFO
+} FLACStreaminfo;
+
+typedef struct FLACFrameInfo {
+    FLACCOMMONINFO
+    int blocksize;          /**< block size of the frame                 */
+    int ch_mode;            /**< channel decorrelation mode              */
+    int64_t frame_or_sample_num;    /**< frame number or sample number   */
+    int is_var_size;                /**< specifies if the stream uses variable
+                                         block sizes or a fixed block size;
+                                         also determines the meaning of
+                                         frame_or_sample_num             */
+} FLACFrameInfo;
+
+/**
+ * Parse the Streaminfo metadata block
+ * @param[out] avctx   codec context to set basic stream parameters
+ * @param[out] s       where parsed information is stored
+ * @param[in]  buffer  pointer to start of 34-byte streaminfo data
+ */
+void ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
+                              const uint8_t *buffer);
+
+/**
+ * Validate the FLAC extradata.
+ * @param[in]  avctx codec context containing the extradata.
+ * @param[out] format extradata format.
+ * @param[out] streaminfo_start pointer to start of 34-byte STREAMINFO data.
+ * @return 1 if valid, 0 if not valid.
+ */
+int ff_flac_is_extradata_valid(AVCodecContext *avctx,
+                               enum FLACExtradataFormat *format,
+                               uint8_t **streaminfo_start);
+
+/**
+ * Calculate an estimate for the maximum frame size based on verbatim mode.
+ * @param blocksize block size, in samples
+ * @param ch number of channels
+ * @param bps bits-per-sample
+ */
+int ff_flac_get_max_frame_size(int blocksize, int ch, int bps);
+
+/**
+ * Validate and decode a frame header.
+ * @param      avctx AVCodecContext to use as av_log() context
+ * @param      gb    GetBitContext from which to read frame header
+ * @param[out] fi    frame information
+ * @param      log_level_offset  log level offset. can be used to silence error messages.
+ * @return non-zero on error, 0 if ok
+ */
+int ff_flac_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
+                                FLACFrameInfo *fi, int log_level_offset);
+
+void ff_flac_set_channel_layout(AVCodecContext *avctx);
+
+/**
+ * Parse the metadata block parameters from the header.
+ * @param[in]  block_header header data, at least 4 bytes
+ * @param[out] last indicator for last metadata block
+ * @param[out] type metadata block type
+ * @param[out] size metadata block size
+ */
+static av_always_inline void flac_parse_block_header(const uint8_t *block_header,
+                                                      int *last, int *type, int *size)
+{
+    int tmp = bytestream_get_byte(&block_header);
+    if (last)
+        *last = tmp & 0x80;
+    if (type)
+        *type = tmp & 0x7F;
+    if (size)
+        *size = bytestream_get_be24(&block_header);
+}
+
+#endif /* AVCODEC_FLAC_H */