#include "libavutil/crc.h"
#include "avcodec.h"
#include "internal.h"
-#include "bitstream.h"
+#include "get_bits.h"
#include "bytestream.h"
#include "golomb.h"
#include "flac.h"
return 0;
}
-static int decode_frame(FLACContext *s)
+/**
+ * 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, i;
- int ch_mode, bps, blocksize, samplerate, channels;
- GetBitContext *gb = &s->gb;
+ int bs_code, sr_code, bps_code;
/* frame sync code */
- skip_bits(&s->gb, 16);
+ 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 */
- ch_mode = get_bits(gb, 4);
- if (ch_mode < FLAC_MAX_CHANNELS) {
- channels = ch_mode + 1;
- ch_mode = FLAC_CHMODE_INDEPENDENT;
- } else if (ch_mode <= FLAC_CHMODE_MID_SIDE) {
- channels = 2;
+ 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(s->avctx, AV_LOG_ERROR, "invalid channel mode: %d\n", ch_mode);
- return -1;
- }
- if (channels != s->channels) {
- av_log(s->avctx, AV_LOG_ERROR, "switching channel layout mid-stream "
- "is not supported\n");
+ 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 == 0)
- bps= s->bps;
- else if ((bps_code != 3) && (bps_code != 7))
- bps = sample_size_table[bps_code];
- else {
- av_log(s->avctx, AV_LOG_ERROR, "invalid sample size code (%d)\n",
+ if (bps_code == 3 || bps_code == 7) {
+ av_log(avctx, AV_LOG_ERROR, "invalid sample size code (%d)\n",
bps_code);
return -1;
}
- if (bps > 16) {
- s->avctx->sample_fmt = SAMPLE_FMT_S32;
- s->sample_shift = 32 - bps;
- s->is32 = 1;
- } else {
- s->avctx->sample_fmt = SAMPLE_FMT_S16;
- s->sample_shift = 16 - bps;
- s->is32 = 0;
- }
- s->bps = s->avctx->bits_per_raw_sample = bps;
+ fi->bps = sample_size_table[bps_code];
/* reserved bit */
if (get_bits1(gb)) {
- av_log(s->avctx, AV_LOG_ERROR, "broken stream, invalid padding\n");
+ av_log(avctx, AV_LOG_ERROR, "broken stream, invalid padding\n");
return -1;
}
/* sample or frame count */
if (get_utf8(gb) < 0) {
- av_log(s->avctx, AV_LOG_ERROR, "utf8 fscked\n");
+ av_log(avctx, AV_LOG_ERROR, "utf8 fscked\n");
return -1;
}
/* blocksize */
if (bs_code == 0) {
- av_log(s->avctx, AV_LOG_ERROR, "reserved blocksize code: 0\n");
- return -1;
- } else if (bs_code == 6)
- blocksize = get_bits(gb, 8)+1;
- else if (bs_code == 7)
- blocksize = get_bits(gb, 16)+1;
- else
- blocksize = ff_flac_blocksize_table[bs_code];
-
- if (blocksize > s->max_blocksize) {
- av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", blocksize,
- s->max_blocksize);
+ 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 == 0)
- samplerate= s->samplerate;
- else if (sr_code < 12)
- samplerate = ff_flac_sample_rate_table[sr_code];
- else if (sr_code == 12)
- samplerate = get_bits(gb, 8) * 1000;
- else if (sr_code == 13)
- samplerate = get_bits(gb, 16);
- else if (sr_code == 14)
- samplerate = get_bits(gb, 16) * 10;
- else {
- av_log(s->avctx, AV_LOG_ERROR, "illegal sample rate code %d\n",
+ 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;
}
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(s->avctx, AV_LOG_ERROR, "header crc mismatch\n");
+ av_log(avctx, AV_LOG_ERROR, "header crc mismatch\n");
return -1;
}
- s->blocksize = blocksize;
- s->samplerate = samplerate;
- s->bps = bps;
- s->ch_mode = ch_mode;
+ return 0;
+}
+
+static int decode_frame(FLACContext *s)
+{
+ int i;
+ GetBitContext *gb = &s->gb;
+ FLACFrameInfo fi;
+
+ if (decode_frame_header(s->avctx, gb, &fi)) {
+ av_log(s->avctx, AV_LOG_ERROR, "invalid frame header\n");
+ return -1;
+ }
+
+ if (fi.channels != s->channels) {
+ av_log(s->avctx, AV_LOG_ERROR, "switching channel layout mid-stream "
+ "is not supported\n");
+ return -1;
+ }
+ s->ch_mode = fi.ch_mode;
+
+ if (fi.bps && fi.bps != s->bps) {
+ av_log(s->avctx, AV_LOG_ERROR, "switching bps mid-stream is not "
+ "supported\n");
+ return -1;
+ }
+ if (s->bps > 16) {
+ s->avctx->sample_fmt = SAMPLE_FMT_S32;
+ s->sample_shift = 32 - s->bps;
+ s->is32 = 1;
+ } else {
+ s->avctx->sample_fmt = SAMPLE_FMT_S16;
+ s->sample_shift = 16 - s->bps;
+ s->is32 = 0;
+ }
+
+ if (fi.blocksize > s->max_blocksize) {
+ av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", fi.blocksize,
+ s->max_blocksize);
+ return -1;
+ }
+ s->blocksize = fi.blocksize;
+
+ if (fi.samplerate == 0) {
+ fi.samplerate = s->samplerate;
+ } else if (fi.samplerate != s->samplerate) {
+ av_log(s->avctx, AV_LOG_WARNING, "sample rate changed from %d to %d\n",
+ s->samplerate, fi.samplerate);
+ }
+ s->samplerate = s->avctx->sample_rate = fi.samplerate;
// dump_headers(s->avctx, (FLACStreaminfo *)s);
static int flac_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- const uint8_t *buf, int buf_size)
+ 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;