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-rw-r--r--libavcodec/shorten.c77
1 files changed, 46 insertions, 31 deletions
diff --git a/libavcodec/shorten.c b/libavcodec/shorten.c
index 1527946172..1d3b6eb1bb 100644
--- a/libavcodec/shorten.c
+++ b/libavcodec/shorten.c
@@ -2,20 +2,20 @@
* Shorten decoder
* Copyright (c) 2005 Jeff Muizelaar
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
@@ -50,8 +50,12 @@
#define ENERGYSIZE 3
#define BITSHIFTSIZE 2
+#define TYPE_S8 1
+#define TYPE_U8 2
#define TYPE_S16HL 3
+#define TYPE_U16HL 4
#define TYPE_S16LH 5
+#define TYPE_U16LH 6
#define NWRAP 3
#define NSKIPSIZE 1
@@ -112,7 +116,6 @@ static av_cold int shorten_decode_init(AVCodecContext *avctx)
{
ShortenContext *s = avctx->priv_data;
s->avctx = avctx;
- avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
return 0;
}
@@ -182,13 +185,17 @@ static int init_offset(ShortenContext *s)
int nblock = FFMAX(1, s->nmean);
/* initialise offset */
switch (s->internal_ftype) {
+ case TYPE_U8:
+ s->avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
+ mean = 0x80;
+ break;
case TYPE_S16HL:
case TYPE_S16LH:
- mean = 0;
+ s->avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
break;
default:
- av_log(s->avctx, AV_LOG_ERROR, "unknown audio type");
- return AVERROR_INVALIDDATA;
+ av_log(s->avctx, AV_LOG_ERROR, "unknown audio type\n");
+ return AVERROR_PATCHWELCOME;
}
for (chan = 0; chan < s->channels; chan++)
@@ -200,8 +207,9 @@ static int init_offset(ShortenContext *s)
static int decode_wave_header(AVCodecContext *avctx, const uint8_t *header,
int header_size)
{
- int len;
+ int len, bps;
short wave_format;
+ const uint8_t *end= header + header_size;
if (bytestream_get_le32(&header) != MKTAG('R', 'I', 'F', 'F')) {
av_log(avctx, AV_LOG_ERROR, "missing RIFF tag\n");
@@ -217,6 +225,8 @@ static int decode_wave_header(AVCodecContext *avctx, const uint8_t *header,
while (bytestream_get_le32(&header) != MKTAG('f', 'm', 't', ' ')) {
len = bytestream_get_le32(&header);
+ if (len<0 || end - header - 8 < len)
+ return AVERROR_INVALIDDATA;
header += len;
}
len = bytestream_get_le32(&header);
@@ -240,10 +250,11 @@ static int decode_wave_header(AVCodecContext *avctx, const uint8_t *header,
avctx->sample_rate = bytestream_get_le32(&header);
header += 4; // skip bit rate (represents original uncompressed bit rate)
header += 2; // skip block align (not needed)
- avctx->bits_per_coded_sample = bytestream_get_le16(&header);
+ bps = bytestream_get_le16(&header);
+ avctx->bits_per_coded_sample = bps;
- if (avctx->bits_per_coded_sample != 16) {
- av_log(avctx, AV_LOG_ERROR, "unsupported number of bits per sample\n");
+ if (bps != 16 && bps != 8) {
+ av_log(avctx, AV_LOG_ERROR, "unsupported number of bits per sample: %d\n", bps);
return AVERROR(ENOSYS);
}
@@ -254,18 +265,6 @@ static int decode_wave_header(AVCodecContext *avctx, const uint8_t *header,
return 0;
}
-static void output_buffer(int16_t **samples, int nchan, int blocksize,
- int32_t **buffer)
-{
- int i, ch;
- for (ch = 0; ch < nchan; ch++) {
- int32_t *in = buffer[ch];
- int16_t *out = samples[ch];
- for (i = 0; i < blocksize; i++)
- out[i] = av_clip_int16(in[i]);
- }
-}
-
static const int fixed_coeffs[3][3] = {
{ 1, 0, 0 },
{ 2, -1, 0 },
@@ -423,7 +422,7 @@ static int shorten_decode_frame(AVCodecContext *avctx, void *data,
/* allocate internal bitstream buffer */
if (s->max_framesize == 0) {
void *tmp_ptr;
- s->max_framesize = 1024; // should hopefully be enough for the first header
+ s->max_framesize = 8192; // should hopefully be enough for the first header
tmp_ptr = av_fast_realloc(s->bitstream, &s->allocated_bitstream_size,
s->max_framesize);
if (!tmp_ptr) {
@@ -552,7 +551,7 @@ static int shorten_decode_frame(AVCodecContext *avctx, void *data,
sum += s->offset[channel][i];
coffset = sum / s->nmean;
if (s->version >= 2)
- coffset >>= FFMIN(1, s->bitshift);
+ coffset = s->bitshift == 0 ? coffset : coffset >> s->bitshift - 1 >> 1;
}
/* decode samples for this channel */
@@ -591,15 +590,30 @@ static int shorten_decode_frame(AVCodecContext *avctx, void *data,
/* if this is the last channel in the block, output the samples */
s->cur_chan++;
if (s->cur_chan == s->channels) {
+ uint8_t *samples_u8;
+ int16_t *samples_s16;
+ int chan;
+
/* get output buffer */
frame->nb_samples = s->blocksize;
- if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
- av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
+
+ for (chan = 0; chan < s->channels; chan++) {
+ samples_u8 = ((uint8_t **)frame->extended_data)[chan];
+ samples_s16 = ((int16_t **)frame->extended_data)[chan];
+ for (i = 0; i < s->blocksize; i++) {
+ switch (s->internal_ftype) {
+ case TYPE_U8:
+ *samples_u8++ = av_clip_uint8(s->decoded[chan][i]);
+ break;
+ case TYPE_S16HL:
+ case TYPE_S16LH:
+ *samples_s16++ = av_clip_int16(s->decoded[chan][i]);
+ break;
+ }
+ }
}
- /* interleave output */
- output_buffer((int16_t **)frame->extended_data, s->channels,
- s->blocksize, s->decoded);
*got_frame_ptr = 1;
}
@@ -652,5 +666,6 @@ AVCodec ff_shorten_decoder = {
.capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Shorten"),
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
+ AV_SAMPLE_FMT_U8P,
AV_SAMPLE_FMT_NONE },
};
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