C++ (Cpp) ff_amr_bit_reorder 예제들

예제 #1

파일: amrnbdec.c 프로젝트: 0xFFeng/ffmpeg

/**
 * Unpack an RFC4867 speech frame into the AMR frame mode and parameters.
 *
 * The order of speech bits is specified by 3GPP TS 26.101.
 *
 * @param p the context
 * @param buf               pointer to the input buffer
 * @param buf_size          size of the input buffer
 *
 * @return the frame mode
 */
static enum Mode unpack_bitstream(AMRContext *p, const uint8_t *buf,
                                  int buf_size)
{
    enum Mode mode;

    // Decode the first octet.
    mode = buf[0] >> 3 & 0x0F;                      // frame type
    p->bad_frame_indicator = (buf[0] & 0x4) != 0x4; // quality bit

    if (mode >= N_MODES || buf_size < frame_sizes_nb[mode] + 1) {
        return NO_DATA;
    }

    if (mode < MODE_DTX)
        ff_amr_bit_reorder((uint16_t *) &p->frame, sizeof(AMRNBFrame), buf + 1,
                           amr_unpacking_bitmaps_per_mode[mode]);

    return mode;
}

예제 #2

파일: amrnbdec.c 프로젝트: cchatterj/isabel

/**
 * Unpack an RFC4867 speech frame into the AMR frame mode and parameters.
 *
 * The order of speech bits is specified by 3GPP TS 26.101.
 *
 * @param p the context
 * @param buf               pointer to the input buffer
 * @param buf_size          size of the input buffer
 *
 * @return the frame mode
 */
static enum Mode unpack_bitstream(AMRContext *p, const uint8_t *buf,
                                  int buf_size)
{
    GetBitContext gb;
    enum Mode mode;

    init_get_bits(&gb, buf, buf_size * 8);

    // Decode the first octet.
    skip_bits(&gb, 1);                        // padding bit
    mode = get_bits(&gb, 4);                  // frame type
    p->bad_frame_indicator = !get_bits1(&gb); // quality bit
    skip_bits(&gb, 2);                        // two padding bits

    if (mode < MODE_DTX)
        ff_amr_bit_reorder((uint16_t *) &p->frame, sizeof(AMRNBFrame), buf + 1,
                           amr_unpacking_bitmaps_per_mode[mode]);

    return mode;
}