* 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/channel_layout.h"
#include "libavutil/crc.h"
+#include "libavutil/log.h"
+#include "bytestream.h"
+#include "get_bits.h"
#include "flac.h"
#include "flacdata.h"
static const int8_t sample_size_table[] = { 0, 8, 12, 0, 16, 20, 24, 0 };
+static const uint64_t flac_channel_layouts[8] = {
+ AV_CH_LAYOUT_MONO,
+ AV_CH_LAYOUT_STEREO,
+ AV_CH_LAYOUT_SURROUND,
+ AV_CH_LAYOUT_QUAD,
+ AV_CH_LAYOUT_5POINT0,
+ AV_CH_LAYOUT_5POINT1,
+ AV_CH_LAYOUT_6POINT1,
+ AV_CH_LAYOUT_7POINT1
+};
+
static int64_t get_utf8(GetBitContext *gb)
{
int64_t val;
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 + log_level_offset, "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 + log_level_offset, "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;
}
/* reserved bit */
if (get_bits1(gb)) {
- av_log(avctx, AV_LOG_ERROR + log_level_offset, "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 */
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");
+ 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 + log_level_offset, "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;
} else if (sr_code == 14) {
fi->samplerate = get_bits(gb, 16) * 10;
} else {
- av_log(avctx, AV_LOG_ERROR + log_level_offset, "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;
}
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 + log_level_offset, "header crc mismatch\n");
+ av_log(avctx, AV_LOG_ERROR + log_level_offset,
+ "header crc mismatch\n");
return -1;
}
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 ff_flac_set_channel_layout(AVCodecContext *avctx)
+{
+ if (avctx->channels <= FF_ARRAY_ELEMS(flac_channel_layouts))
+ avctx->channel_layout = flac_channel_layouts[avctx->channels - 1];
+ else
+ avctx->channel_layout = 0;
+}
+
+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;
+ ff_flac_set_channel_layout(avctx);
+
+ 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);
+}
projects / ffmpeg / blobdiff