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Pitch delay decoding

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Originally committed as revision 19281 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vladimir Voroshilov 2009-06-26 17:43:05 +00:00
parent 2b0691349f
commit d266709055
1 changed files with 25 additions and 0 deletions
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25
libavcodec/g729dec.c
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@ -81,6 +81,8 @@ typedef struct {
} G729FormatDescription;
typedef struct {
int pitch_delay_int_prev; ///< integer part of previous subframe's pitch delay (4.1.3)
/// (2.13) LSP quantizer outputs
int16_t past_quantizer_output_buf[MA_NP + 1][10];
int16_t* past_quantizer_outputs[MA_NP + 1];
@ -206,6 +208,9 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
uint8_t quantizer_2nd_lo; ///< second stage lower vector of quantizer (size in bits)
uint8_t quantizer_2nd_hi; ///< second stage higher vector of quantizer (size in bits)
int pitch_delay_int; // pitch delay, integer part
int pitch_delay_3x; // pitch delay, multiplied by 3
if (*data_size < SUBFRAME_SIZE << 2) {
av_log(avctx, AV_LOG_ERROR, "Error processing packet: output buffer too small\n");
return AVERROR(EIO);
@ -258,6 +263,24 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
gc_1st_index = get_bits(&gb, format.gc_1st_index_bits);
gc_2nd_index = get_bits(&gb, format.gc_2nd_index_bits);
if(!i) {
if (bad_pitch)
pitch_delay_3x = 3 * ctx->pitch_delay_int_prev;
else
pitch_delay_3x = ff_acelp_decode_8bit_to_1st_delay3(ac_index);
} else {
int pitch_delay_min = av_clip(ctx->pitch_delay_int_prev - 5,
PITCH_DELAY_MIN, PITCH_DELAY_MAX - 9);
if(packet_type == FORMAT_G729D_6K4)
pitch_delay_3x = ff_acelp_decode_4bit_to_2nd_delay3(ac_index, pitch_delay_min);
else
pitch_delay_3x = ff_acelp_decode_5_6_bit_to_2nd_delay3(ac_index, pitch_delay_min);
}
/* Round pitch delay to nearest (used everywhere except ff_acelp_interpolate). */
pitch_delay_int = (pitch_delay_3x + 1) / 3;
ff_acelp_weighted_vector_sum(fc + pitch_delay_int,
fc + pitch_delay_int,
fc, 1 << 14,
@ -281,6 +304,8 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
(!voicing && frame_erasure) ? 0 : ctx->gain_pitch,
( voicing && frame_erasure) ? 0 : ctx->gain_code,
1 << 13, 14, SUBFRAME_SIZE);
ctx->pitch_delay_int_prev = pitch_delay_int;
}
*data_size = SUBFRAME_SIZE << 2;