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qdm2: simplify bitstream reader setup for some subpacket types 

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2012-04-11 13:02:43 +01:00
parent a31787ee3b
commit 9ffe8ee7c5
1 changed files with 26 additions and 20 deletions
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46
libavcodec/qdm2.c
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@ -200,8 +200,6 @@ typedef struct {
} QDM2Context;
static uint8_t empty_buffer[FF_INPUT_BUFFER_PADDING_SIZE];
static VLC vlc_tab_level;
static VLC vlc_tab_diff;
static VLC vlc_tab_run;
@ -1083,13 +1081,12 @@ static void process_subpacket_9 (QDM2Context *q, QDM2SubPNode *node)
* @param node pointer to node with packet
* @param length packet length in bits
*/
static void process_subpacket_10 (QDM2Context *q, QDM2SubPNode *node, int length)
static void process_subpacket_10 (QDM2Context *q, QDM2SubPNode *node)
{
GetBitContext gb;
init_get_bits(&gb, ((node == NULL) ? empty_buffer : node->packet->data), ((node == NULL) ? 0 : node->packet->size*8));
if (length != 0) {
if (node) {
init_get_bits(&gb, node->packet->data, node->packet->size * 8);
init_tone_level_dequantization(q, &gb);
fill_tone_level_array(q, 1);
} else {
@ -1103,13 +1100,17 @@ static void process_subpacket_10 (QDM2Context *q, QDM2SubPNode *node, int length
*
* @param q context
* @param node pointer to node with packet
* @param length packet length in bit
*/
static void process_subpacket_11 (QDM2Context *q, QDM2SubPNode *node, int length)
static void process_subpacket_11 (QDM2Context *q, QDM2SubPNode *node)
{
GetBitContext gb;
int length = 0;
if (node) {
length = node->packet->size * 8;
init_get_bits(&gb, node->packet->data, length);
}
init_get_bits(&gb, ((node == NULL) ? empty_buffer : node->packet->data), ((node == NULL) ? 0 : node->packet->size*8));
if (length >= 32) {
int c = get_bits (&gb, 13);
@ -1129,11 +1130,16 @@ static void process_subpacket_11 (QDM2Context *q, QDM2SubPNode *node, int length
* @param node pointer to node with packet
* @param length packet length in bits
*/
static void process_subpacket_12 (QDM2Context *q, QDM2SubPNode *node, int length)
static void process_subpacket_12 (QDM2Context *q, QDM2SubPNode *node)
{
GetBitContext gb;
int length = 0;
if (node) {
length = node->packet->size * 8;
init_get_bits(&gb, node->packet->data, length);
}
init_get_bits(&gb, ((node == NULL) ? empty_buffer : node->packet->data), ((node == NULL) ? 0 : node->packet->size*8));
synthfilt_build_sb_samples(q, &gb, length, 8, QDM2_SB_USED(q->sub_sampling));
}
@ -1153,21 +1159,21 @@ static void process_synthesis_subpackets (QDM2Context *q, QDM2SubPNode *list)
nodes[1] = qdm2_search_subpacket_type_in_list(list, 10);
if (nodes[1] != NULL)
process_subpacket_10(q, nodes[1], nodes[1]->packet->size << 3);
process_subpacket_10(q, nodes[1]);
else
process_subpacket_10(q, NULL, 0);
process_subpacket_10(q, NULL);
nodes[2] = qdm2_search_subpacket_type_in_list(list, 11);
if (nodes[0] != NULL && nodes[1] != NULL && nodes[2] != NULL)
process_subpacket_11(q, nodes[2], (nodes[2]->packet->size << 3));
process_subpacket_11(q, nodes[2]);
else
process_subpacket_11(q, NULL, 0);
process_subpacket_11(q, NULL);
nodes[3] = qdm2_search_subpacket_type_in_list(list, 12);
if (nodes[0] != NULL && nodes[1] != NULL && nodes[3] != NULL)
process_subpacket_12(q, nodes[3], (nodes[3]->packet->size << 3));
process_subpacket_12(q, nodes[3]);
else
process_subpacket_12(q, NULL, 0);
process_subpacket_12(q, NULL);
}
@ -1289,9 +1295,9 @@ static void qdm2_decode_super_block (QDM2Context *q)
process_synthesis_subpackets(q, q->sub_packet_list_D);
q->do_synth_filter = 1;
} else if (q->do_synth_filter) {
process_subpacket_10(q, NULL, 0);
process_subpacket_11(q, NULL, 0);
process_subpacket_12(q, NULL, 0);
process_subpacket_10(q, NULL);
process_subpacket_11(q, NULL);
process_subpacket_12(q, NULL);
}
/* **************************************************************** */
}