static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,

                                      void *data, int *got_frame,

                                      const uint8_t *buf, int buf_size)

{

    /* Note, the only difference between the 15Bpp and 16Bpp */

    /* Format is the pixel format, the packets are processed the same. */

    FlicDecodeContext *s = avctx->priv_data;



    GetByteContext g2;

    int pixel_ptr;

    unsigned char palette_idx1;



    unsigned int frame_size;

    int num_chunks;



    unsigned int chunk_size;

    int chunk_type;



    int i, j, ret;



    int lines;

    int compressed_lines;

    signed short line_packets;

    int y_ptr;

    int byte_run;

    int pixel_skip;

    int pixel_countdown;

    unsigned char *pixels;

    int pixel;

    unsigned int pixel_limit;



    bytestream2_init(&g2, buf, buf_size);



    if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)

        return ret;



    pixels = s->frame->data[0];

    pixel_limit = s->avctx->height * s->frame->linesize[0];



    frame_size = bytestream2_get_le32(&g2);

    bytestream2_skip(&g2, 2);  /* skip the magic number */

    num_chunks = bytestream2_get_le16(&g2);

    bytestream2_skip(&g2, 8);  /* skip padding */

    if (frame_size > buf_size)

        frame_size = buf_size;





    frame_size -= 16;



    /* iterate through the chunks */

    while ((frame_size > 0) && (num_chunks > 0) &&

            bytestream2_get_bytes_left(&g2) >= 4) {

        int stream_ptr_after_chunk;

        chunk_size = bytestream2_get_le32(&g2);

        if (chunk_size > frame_size) {

            av_log(avctx, AV_LOG_WARNING,

                   "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);

            chunk_size = frame_size;

        }

        stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;



        chunk_type = bytestream2_get_le16(&g2);





        switch (chunk_type) {

        case FLI_256_COLOR:

        case FLI_COLOR:

            /* For some reason, it seems that non-palettized flics do

             * include one of these chunks in their first frame.

             * Why I do not know, it seems rather extraneous. */

            ff_dlog(avctx,

                    "Unexpected Palette chunk %d in non-palettized FLC\n",

                    chunk_type);

            bytestream2_skip(&g2, chunk_size - 6);

            break;



        case FLI_DELTA:

        case FLI_DTA_LC:

            y_ptr = 0;

            compressed_lines = bytestream2_get_le16(&g2);

            while (compressed_lines > 0) {

                if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)

                    break;

                line_packets = bytestream2_get_le16(&g2);

                if (line_packets < 0) {

                    line_packets = -line_packets;

                    y_ptr += line_packets * s->frame->linesize[0];

                } else {

                    compressed_lines--;

                    pixel_ptr = y_ptr;

                    CHECK_PIXEL_PTR(0);

                    pixel_countdown = s->avctx->width;

                    for (i = 0; i < line_packets; i++) {

                        /* account for the skip bytes */

                        if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)

                            break;

                        pixel_skip = bytestream2_get_byte(&g2);

                        pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */

                        pixel_countdown -= pixel_skip;

                        byte_run = sign_extend(bytestream2_get_byte(&g2), 8);

                        if (byte_run < 0) {

                            byte_run = -byte_run;

                            pixel    = bytestream2_get_le16(&g2);

                            CHECK_PIXEL_PTR(2 * byte_run);

                            for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {

                                *((signed short*)(&pixels[pixel_ptr])) = pixel;

                                pixel_ptr += 2;

                            }

                        } else {

                            if (bytestream2_tell(&g2) + 2*byte_run > stream_ptr_after_chunk)

                                break;

                            CHECK_PIXEL_PTR(2 * byte_run);

                            for (j = 0; j < byte_run; j++, pixel_countdown--) {

                                *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);

                                pixel_ptr += 2;

                            }

                        }

                    }



                    y_ptr += s->frame->linesize[0];

                }

            }

            break;



        case FLI_LC:

            av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-palettized FLC\n");

            bytestream2_skip(&g2, chunk_size - 6);

            break;



        case FLI_BLACK:

            /* set the whole frame to 0x0000 which is black in both 15Bpp and 16Bpp modes. */

            memset(pixels, 0x0000,

                   s->frame->linesize[0] * s->avctx->height);

            break;



        case FLI_BRUN:

            y_ptr = 0;

            for (lines = 0; lines < s->avctx->height; lines++) {

                pixel_ptr = y_ptr;

                /* disregard the line packets; instead, iterate through all

                 * pixels on a row */

                bytestream2_skip(&g2, 1);

                pixel_countdown = (s->avctx->width * 2);



                while (pixel_countdown > 0) {

                    if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)

                        break;

                    byte_run = sign_extend(bytestream2_get_byte(&g2), 8);

                    if (byte_run > 0) {

                        palette_idx1 = bytestream2_get_byte(&g2);

                        CHECK_PIXEL_PTR(byte_run);

                        for (j = 0; j < byte_run; j++) {

                            pixels[pixel_ptr++] = palette_idx1;

                            pixel_countdown--;

                            if (pixel_countdown < 0)

                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",

                                       pixel_countdown, lines);

                        }

                    } else {  /* copy bytes if byte_run < 0 */

                        byte_run = -byte_run;

                        if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)

                            break;

                        CHECK_PIXEL_PTR(byte_run);

                        for (j = 0; j < byte_run; j++) {

                            palette_idx1 = bytestream2_get_byte(&g2);

                            pixels[pixel_ptr++] = palette_idx1;

                            pixel_countdown--;

                            if (pixel_countdown < 0)

                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",

                                       pixel_countdown, lines);

                        }

                    }

                }



                /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.

                 * This does not give us any good opportunity to perform word endian conversion

                 * during decompression. So if it is required (i.e., this is not a LE target, we do

                 * a second pass over the line here, swapping the bytes.

                 */

#if HAVE_BIGENDIAN

                pixel_ptr = y_ptr;

                pixel_countdown = s->avctx->width;

                while (pixel_countdown > 0) {

                    *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[pixel_ptr]);

                    pixel_ptr += 2;

                }

#endif

                y_ptr += s->frame->linesize[0];

            }

            break;



        case FLI_DTA_BRUN:

            y_ptr = 0;

            for (lines = 0; lines < s->avctx->height; lines++) {

                pixel_ptr = y_ptr;

                /* disregard the line packets; instead, iterate through all

                 * pixels on a row */

                bytestream2_skip(&g2, 1);

                pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */



                while (pixel_countdown > 0) {

                    if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)

                        break;

                    byte_run = sign_extend(bytestream2_get_byte(&g2), 8);

                    if (byte_run > 0) {

                        pixel    = bytestream2_get_le16(&g2);

                        CHECK_PIXEL_PTR(2 * byte_run);

                        for (j = 0; j < byte_run; j++) {

                            *((signed short*)(&pixels[pixel_ptr])) = pixel;

                            pixel_ptr += 2;

                            pixel_countdown--;

                            if (pixel_countdown < 0)

                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",

                                       pixel_countdown);

                        }

                    } else {  /* copy pixels if byte_run < 0 */

                        byte_run = -byte_run;

                        if (bytestream2_tell(&g2) + 2 * byte_run > stream_ptr_after_chunk)

                            break;

                        CHECK_PIXEL_PTR(2 * byte_run);

                        for (j = 0; j < byte_run; j++) {

                            *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);

                            pixel_ptr  += 2;

                            pixel_countdown--;

                            if (pixel_countdown < 0)

                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",

                                       pixel_countdown);

                        }

                    }

                }



                y_ptr += s->frame->linesize[0];

            }

            break;



        case FLI_COPY:

        case FLI_DTA_COPY:

            /* copy the chunk (uncompressed frame) */

            if (chunk_size - 6 > (unsigned int)(FFALIGN(s->avctx->width, 2) * s->avctx->height)*2) {

                av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \

                       "bigger than image, skipping chunk\n", chunk_size - 6);

                bytestream2_skip(&g2, chunk_size - 6);

            } else {



                for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height;

                     y_ptr += s->frame->linesize[0]) {



                    pixel_countdown = s->avctx->width;

                    pixel_ptr = 0;

                    while (pixel_countdown > 0) {

                      *((signed short*)(&pixels[y_ptr + pixel_ptr])) = bytestream2_get_le16(&g2);

                      pixel_ptr += 2;

                      pixel_countdown--;

                    }

                    if (s->avctx->width & 1)

                        bytestream2_skip(&g2, 2);

                }

            }

            break;



        case FLI_MINI:

            /* some sort of a thumbnail? disregard this chunk... */

            bytestream2_skip(&g2, chunk_size - 6);

            break;



        default:

            av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);

            break;

        }



        if (stream_ptr_after_chunk - bytestream2_tell(&g2) >= 0) {

            bytestream2_skip(&g2, stream_ptr_after_chunk - bytestream2_tell(&g2));

        } else {

            av_log(avctx, AV_LOG_ERROR, "Chunk overread\n");

            break;

        }



        frame_size -= chunk_size;

        num_chunks--;

    }



    /* by the end of the chunk, the stream ptr should equal the frame

     * size (minus 1, possibly); if it doesn't, issue a warning */

    if ((bytestream2_get_bytes_left(&g2) != 0) && (bytestream2_get_bytes_left(&g2) != 1))

        av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \

               "and final chunk ptr = %d\n", buf_size, bytestream2_tell(&g2));



    if ((ret = av_frame_ref(data, s->frame)) < 0)

        return ret;



    *got_frame = 1;



    return buf_size;

}