+int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
+ void *data, int *data_size,
+ 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 = (FlicDecodeContext *)avctx->priv_data;
+
+ int stream_ptr = 0;
+ int pixel_ptr;
+ unsigned char palette_idx1;
+
+ unsigned int frame_size;
+ int num_chunks;
+
+ unsigned int chunk_size;
+ int chunk_type;
+
+ int i, j;
+
+ int lines;
+ int compressed_lines;
+ signed short line_packets;
+ int y_ptr;
+ signed char byte_run;
+ int pixel_skip;
+ int pixel_countdown;
+ unsigned char *pixels;
+ int pixel;
+ int pixel_limit;
+
+ s->frame.reference = 1;
+ s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
+ if (avctx->reget_buffer(avctx, &s->frame) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
+ return -1;
+ }
+
+ pixels = s->frame.data[0];
+ pixel_limit = s->avctx->height * s->frame.linesize[0];
+
+ frame_size = LE_32(&buf[stream_ptr]);
+ stream_ptr += 6; /* skip the magic number */
+ num_chunks = LE_16(&buf[stream_ptr]);
+ stream_ptr += 10; /* skip padding */
+
+ frame_size -= 16;
+
+ /* iterate through the chunks */
+ while ((frame_size > 0) && (num_chunks > 0)) {
+ chunk_size = LE_32(&buf[stream_ptr]);
+ stream_ptr += 4;
+ chunk_type = LE_16(&buf[stream_ptr]);
+ stream_ptr += 2;
+
+ switch (chunk_type) {
+ case FLI_256_COLOR:
+ case FLI_COLOR:
+ /* For some reason, it seems that non-paletised flics do include one of these */
+ /* chunks in their first frame. Why i do not know, it seems rather extraneous */
+/* av_log(avctx, AV_LOG_ERROR, "Unexpected Palette chunk %d in non-paletised FLC\n",chunk_type);*/
+ stream_ptr = stream_ptr + chunk_size - 6;
+ break;
+
+ case FLI_DELTA:
+ case FLI_DTA_LC:
+ y_ptr = 0;
+ compressed_lines = LE_16(&buf[stream_ptr]);
+ stream_ptr += 2;
+ while (compressed_lines > 0) {
+ line_packets = LE_16(&buf[stream_ptr]);
+ stream_ptr += 2;
+ if (line_packets < 0) {
+ line_packets = -line_packets;
+ y_ptr += line_packets * s->frame.linesize[0];
+ } else {
+ compressed_lines--;
+ pixel_ptr = y_ptr;
+ pixel_countdown = s->avctx->width;
+ for (i = 0; i < line_packets; i++) {
+ /* account for the skip bytes */
+ pixel_skip = buf[stream_ptr++];
+ pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
+ pixel_countdown -= pixel_skip;
+ byte_run = buf[stream_ptr++];
+ if (byte_run < 0) {
+ byte_run = -byte_run;
+ pixel = LE_16(&buf[stream_ptr]);
+ stream_ptr += 2;
+ CHECK_PIXEL_PTR(byte_run);
+ for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
+ *((signed short*)(&pixels[pixel_ptr])) = pixel;
+ pixel_ptr += 2;
+ }
+ } else {
+ CHECK_PIXEL_PTR(byte_run);
+ for (j = 0; j < byte_run; j++, pixel_countdown--) {
+ *((signed short*)(&pixels[pixel_ptr])) = LE_16(&buf[stream_ptr]);
+ stream_ptr += 2;
+ 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-paletised FLC\n");
+ stream_ptr = stream_ptr + chunk_size - 6;
+ break;
+
+ case FLI_BLACK:
+ /* set the whole frame to 0x0000 which is balck in both 15Bpp and 16Bpp modes. */
+ memset(pixels, 0x0000,
+ s->frame.linesize[0] * s->avctx->height * 2);
+ 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 */
+ stream_ptr++;
+ pixel_countdown = (s->avctx->width * 2);
+
+ while (pixel_countdown > 0) {
+ byte_run = buf[stream_ptr++];
+ if (byte_run > 0) {
+ palette_idx1 = buf[stream_ptr++];
+ 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)\n",
+ pixel_countdown);
+ }
+ } else { /* copy bytes if byte_run < 0 */
+ byte_run = -byte_run;
+ CHECK_PIXEL_PTR(byte_run);
+ for (j = 0; j < byte_run; j++) {
+ palette_idx1 = buf[stream_ptr++];
+ pixels[pixel_ptr++] = palette_idx1;
+ pixel_countdown--;
+ if (pixel_countdown < 0)
+ av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
+ pixel_countdown);
+ }
+ }
+ }
+
+ /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
+ * This doesnt give us any good oportunity to perform word endian conversion
+ * during decompression. So if its requried (ie, this isnt a LE target, we do
+ * a second pass over the line here, swapping the bytes.
+ */
+ pixel = 0xFF00;
+ if (0xFF00 != LE_16(&pixel)) /* Check if its not an LE Target */
+ {
+ pixel_ptr = y_ptr;
+ pixel_countdown = s->avctx->width;
+ while (pixel_countdown > 0) {
+ *((signed short*)(&pixels[pixel_ptr])) = LE_16(&buf[pixel_ptr]);
+ pixel_ptr += 2;
+ }
+ }
+ 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 */
+ stream_ptr++;
+ pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
+
+ while (pixel_countdown > 0) {
+ byte_run = buf[stream_ptr++];
+ if (byte_run > 0) {
+ pixel = LE_16(&buf[stream_ptr]);
+ stream_ptr += 2;
+ CHECK_PIXEL_PTR(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;
+ CHECK_PIXEL_PTR(byte_run);
+ for (j = 0; j < byte_run; j++) {
+ *((signed short*)(&pixels[pixel_ptr])) = LE_16(&buf[stream_ptr]);
+ stream_ptr += 2;
+ 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)(s->avctx->width * 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);
+ stream_ptr += 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])) = LE_16(&buf[stream_ptr+pixel_ptr]);
+ pixel_ptr += 2;
+ pixel_countdown--;
+ }
+ stream_ptr += s->avctx->width*2;
+ }
+ }
+ break;
+
+ case FLI_MINI:
+ /* some sort of a thumbnail? disregard this chunk... */
+ stream_ptr += chunk_size - 6;
+ break;
+
+ default:
+ av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
+ 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 ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
+ av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
+ "and final chunk ptr = %d\n", buf_size, stream_ptr);
+
+
+ *data_size=sizeof(AVFrame);
+ *(AVFrame*)data = s->frame;
+
+ return buf_size;
+}
+
+static int flic_decode_frame_24BPP(AVCodecContext *avctx,
+ void *data, int *data_size,
+ uint8_t *buf, int buf_size)
+{
+ av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");
+ return -1;
+}
+
+static int flic_decode_frame(AVCodecContext *avctx,
+ void *data, int *data_size,
+ uint8_t *buf, int buf_size)
+{
+ if (avctx->pix_fmt == PIX_FMT_PAL8) {
+ return flic_decode_frame_8BPP(avctx, data, data_size,
+ buf, buf_size);
+ }
+ else if ((avctx->pix_fmt == PIX_FMT_RGB555) ||
+ (avctx->pix_fmt == PIX_FMT_RGB565)) {
+ return flic_decode_frame_15_16BPP(avctx, data, data_size,
+ buf, buf_size);
+ }
+ else if (avctx->pix_fmt == PIX_FMT_BGR24) {
+ return flic_decode_frame_24BPP(avctx, data, data_size,
+ buf, buf_size);
+ }
+
+ /* Shouldnt get here, ever as the pix_fmt is processed */
+ /* in flic_decode_init and the above if should deal with */
+ /* the finite set of possibilites allowable by here. */
+ /* but in case we do, just error out. */
+ av_log(avctx, AV_LOG_ERROR, "Unknown Format of FLC. My Science cant explain how this happened\n");
+ return -1;
+}
+
+
projects / ffmpeg.git / blobdiff