X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fflac.c;h=d624beb61f21fb09833dd7dd691afd940a1b85c1;hb=9bf41210a9a7511f44ea1d7fd2646430889a7c2b;hp=2e3197f483b4fb731b0a79874346551e6b5c822a;hpb=7f4e432148779b338a6199f50eb70845c78fd060;p=ffmpeg

diff --git a/libavcodec/flac.c b/libavcodec/flac.c
index 2e3197f483b..d624beb61f2 100644
--- a/libavcodec/flac.c
+++ b/libavcodec/flac.c
@@ -2,24 +2,27 @@
  * FLAC common code
  * Copyright (c) 2009 Justin Ruggles
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "libavutil/crc.h"
+#include "libavutil/log.h"
+#include "bytestream.h"
+#include "get_bits.h"
 #include "flac.h"
 #include "flacdata.h"
 
@@ -33,18 +36,18 @@ static int64_t get_utf8(GetBitContext *gb)
 }
 
 int ff_flac_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
-                                FLACFrameInfo *fi)
+                                FLACFrameInfo *fi, int log_level_offset)
 {
     int bs_code, sr_code, bps_code;
 
     /* frame sync code */
     if ((get_bits(gb, 15) & 0x7FFF) != 0x7FFC) {
-        av_log(avctx, AV_LOG_ERROR, "invalid sync code\n");
+        av_log(avctx, AV_LOG_ERROR + log_level_offset, "invalid sync code\n");
         return -1;
     }
 
     /* variable block size stream code */
-    skip_bits1(gb);
+    fi->is_var_size = get_bits1(gb);
 
     /* block size and sample rate codes */
     bs_code = get_bits(gb, 4);
@@ -55,17 +58,20 @@ int ff_flac_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
     if (fi->ch_mode < FLAC_MAX_CHANNELS) {
         fi->channels = fi->ch_mode + 1;
         fi->ch_mode = FLAC_CHMODE_INDEPENDENT;
-    } else if (fi->ch_mode <= FLAC_CHMODE_MID_SIDE) {
+    } else if (fi->ch_mode < FLAC_MAX_CHANNELS + FLAC_CHMODE_MID_SIDE) {
         fi->channels = 2;
+        fi->ch_mode -= FLAC_MAX_CHANNELS - 1;
     } else {
-        av_log(avctx, AV_LOG_ERROR, "invalid channel mode: %d\n", fi->ch_mode);
+        av_log(avctx, AV_LOG_ERROR + log_level_offset,
+               "invalid channel mode: %d\n", fi->ch_mode);
         return -1;
     }
 
     /* bits per sample */
     bps_code = get_bits(gb, 3);
     if (bps_code == 3 || bps_code == 7) {
-        av_log(avctx, AV_LOG_ERROR, "invalid sample size code (%d)\n",
+        av_log(avctx, AV_LOG_ERROR + log_level_offset,
+               "invalid sample size code (%d)\n",
                bps_code);
         return -1;
     }
@@ -73,19 +79,23 @@ int ff_flac_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
 
     /* reserved bit */
     if (get_bits1(gb)) {
-        av_log(avctx, AV_LOG_ERROR, "broken stream, invalid padding\n");
+        av_log(avctx, AV_LOG_ERROR + log_level_offset,
+               "broken stream, invalid padding\n");
         return -1;
     }
 
     /* sample or frame count */
-    if (get_utf8(gb) < 0) {
-        av_log(avctx, AV_LOG_ERROR, "utf8 fscked\n");
+    fi->frame_or_sample_num = get_utf8(gb);
+    if (fi->frame_or_sample_num < 0) {
+        av_log(avctx, AV_LOG_ERROR + log_level_offset,
+               "sample/frame number invalid; utf8 fscked\n");
         return -1;
     }
 
     /* blocksize */
     if (bs_code == 0) {
-        av_log(avctx, AV_LOG_ERROR, "reserved blocksize code: 0\n");
+        av_log(avctx, AV_LOG_ERROR + log_level_offset,
+               "reserved blocksize code: 0\n");
         return -1;
     } else if (bs_code == 6) {
         fi->blocksize = get_bits(gb, 8) + 1;
@@ -105,7 +115,8 @@ int ff_flac_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
     } else if (sr_code == 14) {
         fi->samplerate = get_bits(gb, 16) * 10;
     } else {
-        av_log(avctx, AV_LOG_ERROR, "illegal sample rate code %d\n",
+        av_log(avctx, AV_LOG_ERROR + log_level_offset,
+               "illegal sample rate code %d\n",
                sr_code);
         return -1;
     }
@@ -114,7 +125,8 @@ int ff_flac_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
     skip_bits(gb, 8);
     if (av_crc(av_crc_get_table(AV_CRC_8_ATM), 0, gb->buffer,
                get_bits_count(gb)/8)) {
-        av_log(avctx, AV_LOG_ERROR, "header crc mismatch\n");
+        av_log(avctx, AV_LOG_ERROR + log_level_offset,
+               "header crc mismatch\n");
         return -1;
     }
 
@@ -141,3 +153,74 @@ int ff_flac_get_max_frame_size(int blocksize, int ch, int bps)
 
     return count;
 }
+
+int avpriv_flac_is_extradata_valid(AVCodecContext *avctx,
+                               enum FLACExtradataFormat *format,
+                               uint8_t **streaminfo_start)
+{
+    if (!avctx->extradata || avctx->extradata_size < FLAC_STREAMINFO_SIZE) {
+        av_log(avctx, AV_LOG_ERROR, "extradata NULL or too small.\n");
+        return 0;
+    }
+    if (AV_RL32(avctx->extradata) != MKTAG('f','L','a','C')) {
+        /* extradata contains STREAMINFO only */
+        if (avctx->extradata_size != FLAC_STREAMINFO_SIZE) {
+            av_log(avctx, AV_LOG_WARNING, "extradata contains %d bytes too many.\n",
+                   FLAC_STREAMINFO_SIZE-avctx->extradata_size);
+        }
+        *format = FLAC_EXTRADATA_FORMAT_STREAMINFO;
+        *streaminfo_start = avctx->extradata;
+    } else {
+        if (avctx->extradata_size < 8+FLAC_STREAMINFO_SIZE) {
+            av_log(avctx, AV_LOG_ERROR, "extradata too small.\n");
+            return 0;
+        }
+        *format = FLAC_EXTRADATA_FORMAT_FULL_HEADER;
+        *streaminfo_start = &avctx->extradata[8];
+    }
+    return 1;
+}
+
+void avpriv_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
+                              const uint8_t *buffer)
+{
+    GetBitContext gb;
+    init_get_bits(&gb, buffer, FLAC_STREAMINFO_SIZE*8);
+
+    skip_bits(&gb, 16); /* skip min blocksize */
+    s->max_blocksize = get_bits(&gb, 16);
+    if (s->max_blocksize < FLAC_MIN_BLOCKSIZE) {
+        av_log(avctx, AV_LOG_WARNING, "invalid max blocksize: %d\n",
+               s->max_blocksize);
+        s->max_blocksize = 16;
+    }
+
+    skip_bits(&gb, 24); /* skip min frame size */
+    s->max_framesize = get_bits_long(&gb, 24);
+
+    s->samplerate = get_bits_long(&gb, 20);
+    s->channels = get_bits(&gb, 3) + 1;
+    s->bps = get_bits(&gb, 5) + 1;
+
+    avctx->channels = s->channels;
+    avctx->sample_rate = s->samplerate;
+    avctx->bits_per_raw_sample = s->bps;
+
+    s->samples  = get_bits_long(&gb, 32) << 4;
+    s->samples |= get_bits(&gb, 4);
+
+    skip_bits_long(&gb, 64); /* md5 sum */
+    skip_bits_long(&gb, 64); /* md5 sum */
+}
+
+void avpriv_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);
+}