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avcodec/dolby_e: Avoid code duplication when converting input

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convert_input, a nontrivial auxiliary function used by both the general
parsing code as well as the decoder itself, has been duplicated in
c7016e35a624a75bb5b82bee932ddfe28d013b3f; this commit removes said
duplication.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2021-01-26 16:33:01 +01:00
parent 8cbff41583
commit 7c27513d04
3 changed files with 14 additions and 41 deletions
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40
libavcodec/dolby_e.c
View File

@ -25,7 +25,6 @@
#include "internal.h"
#include "get_bits.h"
#include "put_bits.h"
#include "dolby_e.h"
#include "kbdwin.h"
#include "fft.h"
@ -626,42 +625,6 @@ static int parse_key(DBEContext *s)
return 0;
}
static int convert_input(DBEContext *s, int nb_words, int key)
{
const uint8_t *src = s->input;
uint8_t *dst = s->buffer;
PutBitContext pb;
int i;
av_assert0(nb_words <= 1024u);
if (nb_words > s->input_size) {
av_log(s->avctx, AV_LOG_ERROR, "Packet too short\n");
return AVERROR_INVALIDDATA;
}
switch (s->word_bits) {
case 16:
for (i = 0; i < nb_words; i++, src += 2, dst += 2)
AV_WB16(dst, AV_RB16(src) ^ key);
break;
case 20:
init_put_bits(&pb, s->buffer, sizeof(s->buffer));
for (i = 0; i < nb_words; i++, src += 3)
put_bits(&pb, 20, AV_RB24(src) >> 4 ^ key);
flush_put_bits(&pb);
break;
case 24:
for (i = 0; i < nb_words; i++, src += 3, dst += 3)
AV_WB24(dst, AV_RB24(src) ^ key);
break;
default:
av_assert0(0);
}
return init_get_bits(&s->gb, s->buffer, nb_words * s->word_bits);
}
static int parse_metadata_ext(DBEDecodeContext *s1)
{
DBEContext *s = &s1->dectx;
@ -992,7 +955,8 @@ static int parse_audio(DBEDecodeContext *s1, int start, int end, int seg_id)
s1->channels[seg_id][ch].nb_groups = 0;
continue;
}
if ((ret = convert_input(s, s->metadata.ch_size[ch], key)) < 0)
ret = ff_dolby_e_convert_input(s, s->metadata.ch_size[ch], key);
if (ret < 0)
return ret;
if ((ret = parse_channel(s1, ch, seg_id)) < 0) {
if (s1->avctx->err_recognition & AV_EF_EXPLODE)

7
libavcodec/dolby_e.h
View File

@ -84,6 +84,13 @@ typedef struct DBEContext {
static const uint16_t sample_rate_tab[16] = {
0, 42965, 43008, 44800, 53706, 53760
};
/**
* Use the provided key to transform the input into data (put into s->buffer)
* suitable for further processing and initialize s->gb to read said data.
*/
int ff_dolby_e_convert_input(DBEContext *s, int nb_words, int key);
/**
* Initialize DBEContext and parse Dolby E metadata.
* Set word_bits/word_bytes, input, input_size, key_present

8
libavcodec/dolby_e_parse.c
View File

@ -53,7 +53,7 @@ static int parse_key(DBEContext *s)
return 0;
}
static int convert_input(DBEContext *s, int nb_words, int key)
int ff_dolby_e_convert_input(DBEContext *s, int nb_words, int key)
{
const uint8_t *src = s->input;
uint8_t *dst = s->buffer;
@ -63,6 +63,8 @@ static int convert_input(DBEContext *s, int nb_words, int key)
av_assert0(nb_words <= 1024u);
if (nb_words > s->input_size) {
if (s->avctx)
av_log(s->avctx, AV_LOG_ERROR, "Packet too short\n");
return AVERROR_INVALIDDATA;
}
@ -116,7 +118,7 @@ int ff_dolby_e_parse_header(DBEContext *s, const uint8_t *buf, int buf_size)
if ((key = parse_key(s)) < 0)
return key;
if ((ret = convert_input(s, 1, key)) < 0)
if ((ret = ff_dolby_e_convert_input(s, 1, key)) < 0)
return ret;
skip_bits(&s->gb, 4);
@ -127,7 +129,7 @@ int ff_dolby_e_parse_header(DBEContext *s, const uint8_t *buf, int buf_size)
return AVERROR_INVALIDDATA;
}
if ((ret = convert_input(s, mtd_size, key)) < 0)
if ((ret = ff_dolby_e_convert_input(s, mtd_size, key)) < 0)
return ret;
skip_bits(&s->gb, 14);