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Code Issues Releases Activity

store packet GetBitContext in the decoder context

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Originally committed as revision 19762 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Sascha Sommer 2009-09-05 09:56:06 +00:00
parent d2a47a578e
commit 2016932472
1 changed files with 13 additions and 12 deletions
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25
libavcodec/wmaprodec.c
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@ -188,6 +188,7 @@ typedef struct WMAProDecodeCtx {
int16_t subwoofer_cutoffs[WMAPRO_BLOCK_SIZES]; ///< subwoofer cutoff values
/* packet decode state */
GetBitContext pgb; ///< bitstream reader context for the packet
uint8_t packet_sequence_number; ///< current packet number
int num_saved_bits; ///< saved number of bits
int frame_offset; ///< frame offset in the bit reservoir
@ -1441,8 +1442,8 @@ static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len,
static int decode_packet(AVCodecContext *avctx,
void *data, int *data_size, AVPacket* avpkt)
{
GetBitContext gb;
WMAProDecodeCtx *s = avctx->priv_data;
GetBitContext* gb = &s->pgb;
const uint8_t* buf = avpkt->data;
int buf_size = avpkt->size;
int more_frames = 1;
@ -1463,12 +1464,12 @@ static int decode_packet(AVCodecContext *avctx,
buf_size = avctx->block_align;
/** parse packet header */
init_get_bits(&gb, buf, s->buf_bit_size);
packet_sequence_number = get_bits(&gb, 4);
skip_bits(&gb, 2);
init_get_bits(gb, buf, s->buf_bit_size);
packet_sequence_number = get_bits(gb, 4);
skip_bits(gb, 2);
/** get number of bits that need to be added to the previous frame */
num_bits_prev_frame = get_bits(&gb, s->log2_frame_size);
num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
dprintf(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number,
num_bits_prev_frame);
@ -1484,7 +1485,7 @@ static int decode_packet(AVCodecContext *avctx,
if (num_bits_prev_frame > 0) {
/** append the previous frame data to the remaining data from the
previous packet to create a full frame */
save_bits(s, &gb, num_bits_prev_frame, 1);
save_bits(s, gb, num_bits_prev_frame, 1);
dprintf(avctx, "accumulated %x bits of frame data\n",
s->num_saved_bits - s->frame_offset);
@ -1499,12 +1500,12 @@ static int decode_packet(AVCodecContext *avctx,
s->packet_loss = 0;
/** decode the rest of the packet */
while (!s->packet_loss && more_frames &&
remaining_bits(s, &gb) > s->log2_frame_size) {
int frame_size = show_bits(&gb, s->log2_frame_size);
remaining_bits(s, gb) > s->log2_frame_size) {
int frame_size = show_bits(gb, s->log2_frame_size);
/** there is enough data for a full frame */
if (remaining_bits(s, &gb) >= frame_size && frame_size > 0) {
save_bits(s, &gb, frame_size, 0);
if (remaining_bits(s, gb) >= frame_size && frame_size > 0) {
save_bits(s, gb, frame_size, 0);
/** decode the frame */
more_frames = decode_frame(s);
@ -1516,10 +1517,10 @@ static int decode_packet(AVCodecContext *avctx,
more_frames = 0;
}
if (!s->packet_loss && remaining_bits(s, &gb) > 0) {
if (!s->packet_loss && remaining_bits(s, gb) > 0) {
/** save the rest of the data so that it can be decoded
with the next packet */
save_bits(s, &gb, remaining_bits(s, &gb), 0);
save_bits(s, gb, remaining_bits(s, gb), 0);
}
*data_size = (int8_t *)s->samples - (int8_t *)data;