* FLAC (Free Lossless Audio Codec) decoder
* Copyright (c) 2003 Alex Beregszaszi
*
- * 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
*/
* @file
* FLAC (Free Lossless Audio Codec) decoder
* @author Alex Beregszaszi
- *
- * For more information on the FLAC format, visit:
- * http://flac.sourceforge.net/
+ * @see http://flac.sourceforge.net/
*
* This decoder can be used in 1 of 2 ways: Either raw FLAC data can be fed
* through, starting from the initial 'fLaC' signature; or by passing the
#include <limits.h>
+#include "libavutil/audioconvert.h"
#include "libavutil/crc.h"
#include "avcodec.h"
#include "internal.h"
FLACSTREAMINFO
AVCodecContext *avctx; ///< parent AVCodecContext
+ AVFrame frame;
GetBitContext gb; ///< GetBitContext initialized to start at the current frame
int blocksize; ///< number of samples in the current frame
int got_streaminfo; ///< indicates if the STREAMINFO has been read
int32_t *decoded[FLAC_MAX_CHANNELS]; ///< decoded samples
- uint8_t *bitstream;
- unsigned int bitstream_size;
- unsigned int bitstream_index;
- unsigned int allocated_bitstream_size;
} FLACContext;
-static const int sample_size_table[] =
-{ 0, 8, 12, 0, 16, 20, 24, 0 };
-
-static int64_t get_utf8(GetBitContext *gb)
-{
- int64_t val;
- GET_UTF8(val, get_bits(gb, 8), return -1;)
- return val;
-}
+static const int64_t flac_channel_layouts[6] = {
+ AV_CH_LAYOUT_MONO,
+ AV_CH_LAYOUT_STEREO,
+ AV_CH_LAYOUT_SURROUND,
+ AV_CH_LAYOUT_QUAD,
+ AV_CH_LAYOUT_5POINT0,
+ AV_CH_LAYOUT_5POINT1
+};
static void allocate_buffers(FLACContext *s);
-int ff_flac_is_extradata_valid(AVCodecContext *avctx,
+int avpriv_flac_is_extradata_valid(AVCodecContext *avctx,
enum FLACExtradataFormat *format,
uint8_t **streaminfo_start)
{
FLACContext *s = avctx->priv_data;
s->avctx = avctx;
- avctx->sample_fmt = SAMPLE_FMT_S16;
+ avctx->sample_fmt = AV_SAMPLE_FMT_S16;
/* for now, the raw FLAC header is allowed to be passed to the decoder as
frame data instead of extradata. */
if (!avctx->extradata)
return 0;
- if (!ff_flac_is_extradata_valid(avctx, &format, &streaminfo))
+ if (!avpriv_flac_is_extradata_valid(avctx, &format, &streaminfo))
return -1;
/* initialize based on the demuxer-supplied streamdata header */
- ff_flac_parse_streaminfo(avctx, (FLACStreaminfo *)s, streaminfo);
+ avpriv_flac_parse_streaminfo(avctx, (FLACStreaminfo *)s, streaminfo);
if (s->bps > 16)
- avctx->sample_fmt = SAMPLE_FMT_S32;
+ avctx->sample_fmt = AV_SAMPLE_FMT_S32;
else
- avctx->sample_fmt = SAMPLE_FMT_S16;
+ avctx->sample_fmt = AV_SAMPLE_FMT_S16;
allocate_buffers(s);
s->got_streaminfo = 1;
+ avcodec_get_frame_defaults(&s->frame);
+ avctx->coded_frame = &s->frame;
+
+ if (avctx->channels <= FF_ARRAY_ELEMS(flac_channel_layouts))
+ avctx->channel_layout = flac_channel_layouts[avctx->channels - 1];
+
return 0;
}
assert(s->max_blocksize);
- if (s->max_framesize == 0 && s->max_blocksize) {
- s->max_framesize = ff_flac_get_max_frame_size(s->max_blocksize,
- s->channels, s->bps);
- }
-
for (i = 0; i < s->channels; i++) {
s->decoded[i] = av_realloc(s->decoded[i],
sizeof(int32_t)*s->max_blocksize);
}
-
- if (s->allocated_bitstream_size < s->max_framesize)
- s->bitstream= av_fast_realloc(s->bitstream,
- &s->allocated_bitstream_size,
- s->max_framesize);
}
-void ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
+void avpriv_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
const uint8_t *buffer)
{
GetBitContext gb;
dump_headers(avctx, s);
}
-void ff_flac_parse_block_header(const uint8_t *block_header,
+void avpriv_flac_parse_block_header(const uint8_t *block_header,
int *last, int *type, int *size)
{
int tmp = bytestream_get_byte(&block_header);
/* need more data */
return 0;
}
- ff_flac_parse_block_header(&buf[4], NULL, &metadata_type, &metadata_size);
+ avpriv_flac_parse_block_header(&buf[4], NULL, &metadata_type, &metadata_size);
if (metadata_type != FLAC_METADATA_TYPE_STREAMINFO ||
metadata_size != FLAC_STREAMINFO_SIZE) {
return AVERROR_INVALIDDATA;
}
- ff_flac_parse_streaminfo(s->avctx, (FLACStreaminfo *)s, &buf[8]);
+ avpriv_flac_parse_streaminfo(s->avctx, (FLACStreaminfo *)s, &buf[8]);
allocate_buffers(s);
s->got_streaminfo = 1;
buf += 4;
do {
- ff_flac_parse_block_header(buf, &metadata_last, NULL, &metadata_size);
+ if (buf_end - buf < 4)
+ return 0;
+ avpriv_flac_parse_block_header(buf, &metadata_last, NULL, &metadata_size);
buf += 4;
- if (buf + metadata_size > buf_end) {
+ if (buf_end - buf < metadata_size) {
/* need more data in order to read the complete header */
return 0;
}
{
const int blocksize = s->blocksize;
int32_t *decoded = s->decoded[channel];
- int av_uninit(a), av_uninit(b), av_uninit(c), av_uninit(d), i;
+ int a, b, c, d, i;
/* warm up samples */
for (i = 0; i < pred_order; i++) {
type = get_bits(&s->gb, 6);
if (get_bits1(&s->gb)) {
+ int left = get_bits_left(&s->gb);
wasted = 1;
+ if ( left < 0 ||
+ (left < s->curr_bps && !show_bits_long(&s->gb, left)) ||
+ !show_bits_long(&s->gb, s->curr_bps)) {
+ av_log(s->avctx, AV_LOG_ERROR,
+ "Invalid number of wasted bits > available bits (%d) - left=%d\n",
+ s->curr_bps, left);
+ return AVERROR_INVALIDDATA;
+ }
while (!get_bits1(&s->gb))
wasted++;
s->curr_bps -= wasted;
return 0;
}
-/**
- * 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
- * @return non-zero on error, 0 if ok
- */
-static int decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
- FLACFrameInfo *fi)
-{
- int bs_code, sr_code, bps_code;
-
- /* frame sync code */
- skip_bits(gb, 16);
-
- /* block size and sample rate codes */
- bs_code = get_bits(gb, 4);
- sr_code = get_bits(gb, 4);
-
- /* channels and decorrelation */
- fi->ch_mode = get_bits(gb, 4);
- 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) {
- fi->channels = 2;
- } else {
- av_log(avctx, AV_LOG_ERROR, "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",
- bps_code);
- return -1;
- }
- fi->bps = sample_size_table[bps_code];
-
- /* reserved bit */
- if (get_bits1(gb)) {
- av_log(avctx, AV_LOG_ERROR, "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");
- return -1;
- }
-
- /* blocksize */
- if (bs_code == 0) {
- av_log(avctx, AV_LOG_ERROR, "reserved blocksize code: 0\n");
- return -1;
- } else if (bs_code == 6) {
- fi->blocksize = get_bits(gb, 8) + 1;
- } else if (bs_code == 7) {
- fi->blocksize = get_bits(gb, 16) + 1;
- } else {
- fi->blocksize = ff_flac_blocksize_table[bs_code];
- }
-
- /* sample rate */
- if (sr_code < 12) {
- fi->samplerate = ff_flac_sample_rate_table[sr_code];
- } else if (sr_code == 12) {
- fi->samplerate = get_bits(gb, 8) * 1000;
- } else if (sr_code == 13) {
- fi->samplerate = get_bits(gb, 16);
- } 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",
- sr_code);
- return -1;
- }
-
- /* header CRC-8 check */
- 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");
- return -1;
- }
-
- return 0;
-}
-
static int decode_frame(FLACContext *s)
{
int i;
GetBitContext *gb = &s->gb;
FLACFrameInfo fi;
- if (decode_frame_header(s->avctx, gb, &fi)) {
+ if (ff_flac_decode_frame_header(s->avctx, gb, &fi, 0)) {
av_log(s->avctx, AV_LOG_ERROR, "invalid frame header\n");
return -1;
}
s->bps = s->avctx->bits_per_raw_sample = fi.bps;
if (s->bps > 16) {
- s->avctx->sample_fmt = SAMPLE_FMT_S32;
+ s->avctx->sample_fmt = AV_SAMPLE_FMT_S32;
s->sample_shift = 32 - s->bps;
s->is32 = 1;
} else {
- s->avctx->sample_fmt = SAMPLE_FMT_S16;
+ s->avctx->sample_fmt = AV_SAMPLE_FMT_S16;
s->sample_shift = 16 - s->bps;
s->is32 = 0;
}
return 0;
}
-static int flac_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- AVPacket *avpkt)
+static int flac_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame_ptr, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
FLACContext *s = avctx->priv_data;
- int i, j = 0, input_buf_size = 0, bytes_read = 0;
- int16_t *samples_16 = data;
- int32_t *samples_32 = data;
- int alloc_data_size= *data_size;
- int output_size;
+ int i, j = 0, bytes_read = 0;
+ int16_t *samples_16;
+ int32_t *samples_32;
+ int ret;
- *data_size=0;
+ *got_frame_ptr = 0;
if (s->max_framesize == 0) {
s->max_framesize =
ff_flac_get_max_frame_size(s->max_blocksize ? s->max_blocksize : FLAC_MAX_BLOCKSIZE,
FLAC_MAX_CHANNELS, 32);
- s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->max_framesize);
- }
-
- if (1 && s->max_framesize) { //FIXME truncated
- if (s->bitstream_size < 4 || AV_RL32(s->bitstream) != MKTAG('f','L','a','C'))
- buf_size= FFMIN(buf_size, s->max_framesize - FFMIN(s->bitstream_size, s->max_framesize));
- input_buf_size= buf_size;
-
- if (s->bitstream_size + buf_size < buf_size || s->bitstream_index + s->bitstream_size + buf_size < s->bitstream_index)
- return -1;
-
- if (s->allocated_bitstream_size < s->bitstream_size + buf_size)
- s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->bitstream_size + buf_size);
-
- if (s->bitstream_index + s->bitstream_size + buf_size > s->allocated_bitstream_size) {
- memmove(s->bitstream, &s->bitstream[s->bitstream_index],
- s->bitstream_size);
- s->bitstream_index=0;
- }
- memcpy(&s->bitstream[s->bitstream_index + s->bitstream_size],
- buf, buf_size);
- buf= &s->bitstream[s->bitstream_index];
- buf_size += s->bitstream_size;
- s->bitstream_size= buf_size;
-
- if (buf_size < s->max_framesize && input_buf_size) {
- return input_buf_size;
- }
}
/* check that there is at least the smallest decodable amount of data.
this amount corresponds to the smallest valid FLAC frame possible.
FF F8 69 02 00 00 9A 00 00 34 46 */
- if (buf_size < 11)
- goto end;
+ if (buf_size < FLAC_MIN_FRAME_SIZE)
+ return buf_size;
/* check for inline header */
if (AV_RB32(buf) == MKBETAG('f','L','a','C')) {
av_log(s->avctx, AV_LOG_ERROR, "invalid header\n");
return -1;
}
- bytes_read = get_metadata_size(buf, buf_size);
- goto end;
- }
-
- /* check for frame sync code and resync stream if necessary */
- if ((AV_RB16(buf) & 0xFFFE) != 0xFFF8) {
- const uint8_t *buf_end = buf + buf_size;
- av_log(s->avctx, AV_LOG_ERROR, "FRAME HEADER not here\n");
- while (buf+2 < buf_end && (AV_RB16(buf) & 0xFFFE) != 0xFFF8)
- buf++;
- bytes_read = buf_size - (buf_end - buf);
- goto end; // we may not have enough bits left to decode a frame, so try next time
+ return get_metadata_size(buf, buf_size);
}
/* decode frame */
init_get_bits(&s->gb, buf, buf_size*8);
if (decode_frame(s) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "decode_frame() failed\n");
- s->bitstream_size=0;
- s->bitstream_index=0;
return -1;
}
bytes_read = (get_bits_count(&s->gb)+7)/8;
- /* check if allocated data size is large enough for output */
- output_size = s->blocksize * s->channels * (s->is32 ? 4 : 2);
- if (output_size > alloc_data_size) {
- av_log(s->avctx, AV_LOG_ERROR, "output data size is larger than "
- "allocated data size\n");
- goto end;
+ /* get output buffer */
+ s->frame.nb_samples = s->blocksize;
+ if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return ret;
}
- *data_size = output_size;
+ samples_16 = (int16_t *)s->frame.data[0];
+ samples_32 = (int32_t *)s->frame.data[0];
#define DECORRELATE(left, right)\
assert(s->channels == 2);\
DECORRELATE( (a-=b>>1) + b, a)
}
-end:
if (bytes_read > buf_size) {
av_log(s->avctx, AV_LOG_ERROR, "overread: %d\n", bytes_read - buf_size);
- s->bitstream_size=0;
- s->bitstream_index=0;
return -1;
}
+ if (bytes_read < buf_size) {
+ av_log(s->avctx, AV_LOG_DEBUG, "underread: %d orig size: %d\n",
+ buf_size - bytes_read, buf_size);
+ }
+
+ *got_frame_ptr = 1;
+ *(AVFrame *)data = s->frame;
- if (s->bitstream_size) {
- s->bitstream_index += bytes_read;
- s->bitstream_size -= bytes_read;
- return input_buf_size;
- } else
- return bytes_read;
+ return bytes_read;
}
static av_cold int flac_decode_close(AVCodecContext *avctx)
for (i = 0; i < s->channels; i++) {
av_freep(&s->decoded[i]);
}
- av_freep(&s->bitstream);
return 0;
}
-static void flac_flush(AVCodecContext *avctx)
-{
- FLACContext *s = avctx->priv_data;
-
- s->bitstream_size=
- s->bitstream_index= 0;
-}
-
-AVCodec flac_decoder = {
- "flac",
- AVMEDIA_TYPE_AUDIO,
- CODEC_ID_FLAC,
- sizeof(FLACContext),
- flac_decode_init,
- NULL,
- flac_decode_close,
- flac_decode_frame,
- CODEC_CAP_DELAY | CODEC_CAP_SUBFRAMES, /* FIXME: add a FLAC parser so that
- we will not need to use either
- of these capabilities */
- .flush= flac_flush,
- .long_name= NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
+AVCodec ff_flac_decoder = {
+ .name = "flac",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = CODEC_ID_FLAC,
+ .priv_data_size = sizeof(FLACContext),
+ .init = flac_decode_init,
+ .close = flac_decode_close,
+ .decode = flac_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
};
projects / ffmpeg / blobdiff