diff options
author | Kenan Gillet <kenan.gillet@gmail.com> | 2008-12-02 01:07:00 +0300 |
---|---|---|
committer | Vitor Sessak <vitor1001@gmail.com> | 2008-12-02 01:07:00 +0300 |
commit | 061f407e538b6107b2b9e78ff36edc4764ea3199 (patch) | |
tree | 628e95f9f854531dc56da7c3f0dab78abe376ef8 /libavcodec | |
parent | b8438f5f48c6aab06c1128229975286799d18861 (diff) |
More OKed parts of the QCELP decoder
patch by Kenan Gillet, kenan.gillet gmail com
Originally committed as revision 15975 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec')
-rw-r--r-- | libavcodec/qcelpdec.c | 61 |
1 files changed, 60 insertions, 1 deletions
diff --git a/libavcodec/qcelpdec.c b/libavcodec/qcelpdec.c index fead95878d..a759b1bc2a 100644 --- a/libavcodec/qcelpdec.c +++ b/libavcodec/qcelpdec.c @@ -31,7 +31,6 @@ #include "avcodec.h" #include "bitstream.h" -#include "qcelp.h" #include "qcelpdata.h" #include "celp_math.h" @@ -40,6 +39,16 @@ #undef NDEBUG #include <assert.h> +typedef enum +{ + I_F_Q = -1, /*!< insufficient frame quality */ + SILENCE, + RATE_OCTAVE, + RATE_QUARTER, + RATE_HALF, + RATE_FULL +} qcelp_packet_rate; + typedef struct { GetBitContext gb; qcelp_packet_rate bitrate; @@ -49,6 +58,9 @@ typedef struct { float prev_lspf[10]; float predictor_lspf[10]; /*!< LSP predictor, only use for RATE_OCTAVE and I_F_Q */ + float pitch_synthesis_filter_mem[303]; + float pitch_pre_filter_mem[303]; + float rnd_fir_filter_mem[180]; float formant_mem[170]; float last_codebook_gain; int prev_g1[2]; @@ -58,6 +70,13 @@ typedef struct { uint16_t first16bits; } QCELPContext; +/** + * Reconstructs LPC coefficients from the line spectral pair frequencies. + * + * TIA/EIA/IS-733 2.4.3.3.5 + */ +void qcelp_lspf2lpc(const float *lspf, float *lpc); + static void weighted_vector_sumf(float *out, const float *in_a, const float *in_b, float weight_coeff_a, float weight_coeff_b, int length) @@ -527,6 +546,46 @@ static int buf_size2bitrate(const int buf_size) return -1; } +/** + * Determine the bitrate from the frame size and/or the first byte of the frame. + * + * @param avctx the AV codec context + * @param buf_size length of the buffer + * @param buf the bufffer + * + * @return the bitrate on success, + * I_F_Q if the bitrate cannot be satisfactorily determined + * + * TIA/EIA/IS-733 2.4.8.7.1 + */ +static int determine_bitrate(AVCodecContext *avctx, + const int buf_size, + uint8_t **buf) { + qcelp_packet_rate bitrate; + + if ((bitrate = buf_size2bitrate(buf_size)) >= 0) { + if (bitrate > **buf) { + av_log(avctx, AV_LOG_WARNING, "Claimed bitrate and buffer size mismatch.\n"); + bitrate = **buf; + } else if (bitrate < **buf) { + av_log(avctx, AV_LOG_ERROR, "Buffer is too small for the claimed bitrate.\n"); + return I_F_Q; + } + (*buf)++; + } else if ((bitrate = buf_size2bitrate(buf_size + 1)) >= 0) { + av_log(avctx, AV_LOG_WARNING, + "Bitrate byte is missing, guessing the bitrate from packet size.\n"); + } else + return I_F_Q; + + if (bitrate == SILENCE) { + // FIXME: the decoder should not handle SILENCE frames as I_F_Q frames + av_log_missing_feature(avctx, "Blank frame", 1); + bitrate = I_F_Q; + } + return bitrate; +} + static void warn_insufficient_frame_quality(AVCodecContext *avctx, const char *message) { |