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| author | Vladimir Voroshilov <voroshil@gmail.com> | 2009-06-05 01:43:22 +0700 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2011-09-24 21:11:00 +0200 |
| commit | 9297c7822fc2a46472cb5bb072f9f7a7d0de2948 (patch) | |
| tree | 248ba2412e2f1ac8c9d6dcdc78dfeb4c417ea75d /libavcodec/g729dec.c | |
| parent | 70efd101f102168d928b394f1e46f555c82afad9 (diff) | |
| download | ffmpeg-9297c7822fc2a46472cb5bb072f9f7a7d0de2948.tar.gz | |
Fixed-codebook vector decoding
Diffstat (limited to 'libavcodec/g729dec.c')
| -rw-r--r-- | libavcodec/g729dec.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/libavcodec/g729dec.c b/libavcodec/g729dec.c index 9826e63e49..61fecd6662 100644 --- a/libavcodec/g729dec.c +++ b/libavcodec/g729dec.c @@ -249,6 +249,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, int pitch_delay_int; // pitch delay, integer part int pitch_delay_3x; // pitch delay, multiplied by 3 + int16_t fc[SUBFRAME_SIZE]; // fixed-codebook vector if (*data_size < SUBFRAME_SIZE << 2) { av_log(avctx, AV_LOG_ERROR, "Error processing packet: output buffer too small\n"); @@ -335,6 +336,28 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, /* Round pitch delay to nearest (used everywhere except ff_acelp_interpolate). */ pitch_delay_int = (pitch_delay_3x + 1) / 3; + memset(fc, 0, sizeof(int16_t) * SUBFRAME_SIZE); + switch (packet_type) { + case FORMAT_G729_8K: + ff_acelp_fc_pulse_per_track(fc, ff_fc_4pulses_8bits_tracks_13, + ff_fc_4pulses_8bits_track_4, + fc_indexes, pulses_signs, 3, 3); + break; + case FORMAT_G729D_6K4: + ff_acelp_fc_pulse_per_track(fc, ff_fc_2pulses_9bits_track1_gray, + ff_fc_2pulses_9bits_track2_gray, + fc_indexes, pulses_signs, 1, 4); + break; + } + + /* + This filter enhances harmonic components of the fixed-codebook vector to + improve the quality of the reconstructed speech. + + / fc_v[i], i < pitch_delay + fc_v[i] = < + \ fc_v[i] + gain_pitch * fc_v[i-pitch_delay], i >= pitch_delay + */ ff_acelp_weighted_vector_sum(fc + pitch_delay_int, fc + pitch_delay_int, fc, 1 << 14, |