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ADDED_SYMBOLS.md

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Added Symbols for Thingino Streamer

This document lists all the symbols that were added to OpenIMP to support the thingino-streamer binary.

Summary

Added 16 new IMP symbols that were missing from the device's libimp.so:

  • 11 ISP Tuning Get functions - Image quality parameter getters
  • 5 Encoder functions - Advanced encoder configuration

Note: The sft_* font rendering functions are already present in the device's existing libsysutils.so, so we don't need to provide them.

ISP Tuning Get Functions

These functions retrieve current ISP image quality settings. All are based on Binary Ninja MCP decompilations from libimp.so v1.1.6.

Functions Added to src/imp_isp.c:

  1. IMP_ISP_Tuning_GetBrightness(unsigned char *pbright)

    • Returns current brightness value (0-255)
    • Default: 128 (middle value)

  2. IMP_ISP_Tuning_GetContrast(unsigned char *pcontrast)

    • Returns current contrast value (0-255)
    • Default: 128 (middle value)

  3. IMP_ISP_Tuning_GetSharpness(unsigned char *psharpness)

    • Returns current sharpness value (0-255)
    • Default: 128 (middle value)

  4. IMP_ISP_Tuning_GetSaturation(unsigned char *psat)

    • Returns current saturation value (0-255)
    • Default: 128 (middle value)

  5. IMP_ISP_Tuning_GetAeComp(int *pcomp)

    • Returns current AE compensation value
    • Default: 0 (no compensation)

  6. IMP_ISP_Tuning_GetBacklightComp(uint32_t *pstrength)

    • Returns current backlight compensation strength
    • Default: 0 (off)

  7. IMP_ISP_Tuning_GetHiLightDepress(uint32_t *pstrength)

    • Returns current highlight depress strength
    • Default: 0 (off)

  8. IMP_ISP_Tuning_GetBcshHue(unsigned char *phue)

    • Returns current hue value (0-255)
    • Default: 128 (middle value)

  9. IMP_ISP_Tuning_GetEVAttr(IMPISPEVAttr *attr)

    • Returns current EV (Exposure Value) attributes
    • Returns zeroed structure

  10. IMP_ISP_Tuning_GetWB_Statis(IMPISPWB *wb)

    • Returns white balance statistics
    • Default: AUTO mode, rgain=256, bgain=256

  11. IMP_ISP_Tuning_GetWB_GOL_Statis(IMPISPWB *wb)

    • Returns white balance GOL statistics
    • Default: AUTO mode, rgain=256, bgain=256

New Type Added to include/imp/imp_isp.h:

typedef struct {
    uint32_t ev[6];  /**< EV values */
} IMPISPEVAttr;

Encoder Functions

These functions provide advanced encoder configuration. Based on Binary Ninja MCP decompilations.

Functions Added to src/imp_encoder.c:

  1. IMP_Encoder_SetChnQp(int encChn, IMPEncoderQp *qp)

    • Sets QP (Quantization Parameter) for encoder channel
    • Calls AL_Codec_Encode_SetQp() internally
    • Decompiled from address 0x87f5c

  2. IMP_Encoder_SetChnGopLength(int encChn, int gopLength)

    • Sets GOP (Group of Pictures) length
    • Stores at offset 0x3d0 in channel structure
    • Decompiled from address 0x88810

  3. IMP_Encoder_SetChnEntropyMode(int encChn, int mode)

    • Sets entropy coding mode (0=CAVLC, 1=CABAC)
    • Stores at offset 0x3fc in channel structure
    • Decompiled from address 0x88cb4

  4. IMP_Encoder_SetMaxStreamCnt(int encChn, int cnt)

    • Sets maximum stream count
    • Stores at offset 0x4c0 in channel structure
    • Decompiled from address 0x8648c

  5. IMP_Encoder_SetStreamBufSize(int encChn, int size)

    • Sets stream buffer size
    • Stores at offset 0x4c4 in channel structure
    • Decompiled from address 0x86650

New Type Added to include/imp/imp_encoder.h:

typedef struct {
    uint32_t qp_i;  /**< I frame QP */
    uint32_t qp_p;  /**< P frame QP */
    uint32_t qp_b;  /**< B frame QP */
} IMPEncoderQp;

Codec Function Added to src/codec.c:

  • AL_Codec_Encode_SetQp(void *codec, void *qp)
    • Internal codec function for setting QP parameters
    • Called by IMP_Encoder_SetChnQp()

Font Rendering Functions (sft_*)

Note: The device already has the sft_* font rendering functions in its existing libsysutils.so. These functions are provided by the libschrift library and are already available on the device. We do not need to implement them in OpenIMP.

Testing

All 16 IMP symbols compile successfully and are exported in lib/libimp.so.

The thingino-streamer binary should now be able to resolve all required IMP symbols when using this library.

Implementation Notes

  1. ISP Get Functions: Return sensible default values. In a full implementation, these would read from ISP hardware registers via ioctl calls to /dev/tx-isp.

  2. Encoder Functions: Store configuration in channel structure. In a full implementation, these would configure the hardware encoder via the AL_Codec interface.

References

  • Binary Ninja MCP decompilations from libimp.so v1.1.6 (T31 platform)
  • Ingenic T31 SDK documentation
  • OpenIMP reverse engineering project