static int xsub_encode(AVCodecContext *avctx, unsigned char *buf, int bufsize, void *data) { AVSubtitle *h = data; uint64_t startTime = h->pts / 1000; // FIXME: need better solution... uint64_t endTime = startTime + h->end_display_time - h->start_display_time; int start_tc[4], end_tc[4]; uint8_t *hdr = buf + 27; // Point behind the timestamp uint8_t *rlelenptr; uint16_t width, height; int i; PutBitContext pb; if (bufsize < 27 + 7*2 + 4*3) { av_log(avctx, AV_LOG_ERROR, "Buffer too small for XSUB header.\n"); return -1; } // TODO: support multiple rects if (h->num_rects > 1) av_log(avctx, AV_LOG_WARNING, "Only single rects supported (%d in subtitle.)\n", h->num_rects); // TODO: render text-based subtitles into bitmaps if (!h->rects[0]->pict.data[0] || !h->rects[0]->pict.data[1]) { av_log(avctx, AV_LOG_WARNING, "No subtitle bitmap available.\n"); return -1; } // TODO: color reduction, similar to dvdsub encoder if (h->rects[0]->nb_colors > 4) av_log(avctx, AV_LOG_WARNING, "No more than 4 subtitle colors supported (%d found.)\n", h->rects[0]->nb_colors); // TODO: Palette swapping if color zero is not transparent if (((uint32_t *)h->rects[0]->pict.data[1])[0] & 0xff) av_log(avctx, AV_LOG_WARNING, "Color index 0 is not transparent. Transparency will be messed up.\n"); if (make_tc(startTime, start_tc) || make_tc(endTime, end_tc)) { av_log(avctx, AV_LOG_WARNING, "Time code >= 100 hours.\n"); return -1; } snprintf(buf, 28, "[%02d:%02d:%02d.%03d-%02d:%02d:%02d.%03d]", start_tc[3], start_tc[2], start_tc[1], start_tc[0], end_tc[3], end_tc[2], end_tc[1], end_tc[0]); // Width and height must probably be multiples of 2. // 2 pixels required on either side of subtitle. // Possibly due to limitations of hardware renderers. // TODO: check if the bitmap is already padded width = FFALIGN(h->rects[0]->w, 2) + PADDING * 2; height = FFALIGN(h->rects[0]->h, 2); bytestream_put_le16(&hdr, width); bytestream_put_le16(&hdr, height); bytestream_put_le16(&hdr, h->rects[0]->x); bytestream_put_le16(&hdr, h->rects[0]->y); bytestream_put_le16(&hdr, h->rects[0]->x + width); bytestream_put_le16(&hdr, h->rects[0]->y + height); rlelenptr = hdr; // Will store length of first field here later. hdr+=2; // Palette for (i=0; i<4; i++) bytestream_put_be24(&hdr, ((uint32_t *)h->rects[0]->pict.data[1])[i]); // Bitmap // RLE buffer. Reserve 2 bytes for possible padding after the last row. init_put_bits(&pb, hdr, bufsize - (hdr - buf) - 2); if (xsub_encode_rle(&pb, h->rects[0]->pict.data[0], h->rects[0]->pict.linesize[0]*2, h->rects[0]->w, (h->rects[0]->h + 1) >> 1)) return -1; bytestream_put_le16(&rlelenptr, put_bits_count(&pb) >> 3); // Length of first field if (xsub_encode_rle(&pb, h->rects[0]->pict.data[0] + h->rects[0]->pict.linesize[0], h->rects[0]->pict.linesize[0]*2, h->rects[0]->w, h->rects[0]->h >> 1)) return -1; // Enforce total height to be be multiple of 2 if (h->rects[0]->h & 1) { put_xsub_rle(&pb, h->rects[0]->w, PADDING_COLOR); align_put_bits(&pb); } flush_put_bits(&pb); return hdr - buf + put_bits_count(&pb)/8; }
static int xsub_encode(AVCodecContext *avctx, unsigned char *buf, int bufsize, void *data) { AVSubtitle *h = data; uint64_t startTime = h->pts / 1000;  