On 09/12/2010 04:34 PM, Marcelo Galvão Póvoa wrote:
On 12 September 2010 06:28, Vitor Sessak<[email protected]> wrote:
On 09/12/2010 12:25 AM, Marcelo Galvão Póvoa wrote:
On 11 September 2010 18:54, Vitor Sessak<[email protected]> wrote:
On 09/11/2010 06:08 PM, Marcelo Galvão Póvoa wrote:
2010/9/11 Marcelo Galvão Póvoa<[email protected]>:
On 11 September 2010 12:37, Vitor Sessak<[email protected]> wrote:
On 09/11/2010 04:47 PM, Marcelo Galvão Póvoa wrote:
On 9 September 2010 16:11, Vitor Sessak<[email protected]>
wrote:
On 09/07/2010 02:05 AM, Marcelo Galvão Póvoa wrote:
On 6 September 2010 11:31, Vitor Sessak<[email protected]>
wrote:
On 09/06/2010 02:46 AM, Marcelo Galvăo Póvoa wrote:
[...]
Can celp_filters.c:ff_celp_circ_addf() simplify this?
I already gave some thought to that but I couldn't figure out how
to
use ff_celp_circ_addf() there. I wrote the algorithm the simplest
way
I could think of.
Try
for (i = 0; i< AMRWB_SFR_SIZE; i++)
if (fixed_vector[i])
ff_celp_circ_addf(buf, buf, coef, i, fixed_vector[i],
AMRWB_SFR_SIZE);
That's right indeed, thanks!
/*
* AMR wideband decoder
* Copyright (c) 2010 Marcelo Galvao Povoa
*
* This file is part of FFmpeg.
*
* 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.
*
* 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "libavutil/lfg.h"
#include "avcodec.h"
#include "get_bits.h"
#include "lsp.h"
#include "celp_math.h"
#include "celp_filters.h"
#include "acelp_filters.h"
#include "acelp_vectors.h"
#include "acelp_pitch_delay.h"
#include "amrwbdata.h"
No need to include amr.h?
Oops, fixed
Sorry, I forgot to define the table type before the include. Fixed
Just one last think I just saw:
ctx->fr_cur_mode = unpack_bitstream(ctx, buf, buf_size);
expected_fr_size = ((cf_sizes_wb[ctx->fr_cur_mode] + 7)>> 3) + 1;
if (buf_size< expected_fr_size) {
av_log(avctx, AV_LOG_ERROR,
"Frame too small (%d bytes). Truncated file?\n", buf_size);
*data_size = 0;
return buf_size;
}
This check is not useful like that. Imagine that buf_size == 1. Then,
unpack_bitstream will try to read buf[2] and will segfault. This check
should be done before the call of ff_amr_bit_reorder().
I thought about that, but how I would calculate expected_fr_size if I
don't know of which mode the frame is? One solution would be doing
this check inside ff_amr_bit_reorder() just after decoding the header.
Another solution would be to get rid of the unpack_bitstrem() function and
move its code to amrwb_decode_frame(). It is already almost a wrapper around
ff_amr_bit_reorder(). It would also allows to avoid checking
(ctx->fr_cur_mode< MODE_SID) twice...
Interesting, but how about instead of moving all the code to
amrwb_decode_frame(), we keep a function to decode the header since
there are more than one type of it. I wrote the simpler (and most
common I guess) "MIME/storage" header format but in case someone wants
to implement the others this way would be easier. See the patch I
attached.
I like it. Just a last nitpick:
+ header_size = decode_mime_header(ctx, buf);
+ expected_fr_size = ((cf_sizes_wb[ctx->fr_cur_mode] + 7) >> 3) + 1;
+
+ if (buf_size < expected_fr_size) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Frame too small (%d bytes). Truncated file?\n", buf_size);
+ *data_size = 0;
+ return buf_size;
+ }
+
+ if (!ctx->fr_quality || ctx->fr_cur_mode > MODE_SID) {
+ av_log(avctx, AV_LOG_ERROR, "Encountered a bad or corrupted frame\n");
+ }
Is there any chance of decoding that frame if ctx->fr_cur_mode >
MODE_SID? Better to bail out with an error in this case.
+ if (ctx->fr_cur_mode < MODE_SID) { /* Normal speech frame */
+ ff_amr_bit_reorder((uint16_t *) &ctx->frame, sizeof(AMRWBFrame),
+ buf + header_size, amr_bit_orderings_by_mode[ctx->fr_cur_mode]);
+ }
+ else if (ctx->fr_cur_mode == MODE_SID) { /* Comfort noise frame */
+ av_log_missing_feature(avctx, "SID mode", 1);
+ return -1;
+ }
I think it all be clearer in the following way:
header_size = decode_mime_header(ctx, buf);
expected_fr_size = ((cf_sizes_wb[ctx->fr_cur_mode] + 7) >> 3) + 1;
if (buf_size < expected_fr_size) {
av_log(avctx, AV_LOG_ERROR,
"Frame too small (%d bytes). Truncated file?\n", buf_size);
*data_size = 0;
return buf_size;
}
if (!ctx->fr_quality || ctx->fr_cur_mode > MODE_SID)
av_log(avctx, AV_LOG_ERROR, "Encountered a bad or corrupted
frame\n");
if (ctx->fr_cur_mode == MODE_SID) /* Comfort noise frame */
av_log_missing_feature(avctx, "SID mode", 1);
if (ctx->fr_cur_mode >= MODE_SID)
return -1;
ff_amr_bit_reorder((uint16_t *) &ctx->frame, sizeof(AMRWBFrame),
buf + header_size, amr_bit_orderings_by_mode[ctx->fr_cur_mode]);
In that way, the ff_amr_bit_reorder() call is not in the middle of the
error handling. Finally, after fixing this, if Rob agree, I think you
can move this discussion to ffmpeg-devel.
-Vitor
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