static int truemotion1_decode_header(TrueMotion1Context *s) { int i, ret; int width_shift = 0; int new_pix_fmt; struct frame_header header; uint8_t header_buffer[128] = { 0 }; /* logical maximum size of the header */ const uint8_t *sel_vector_table; header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f; if (s->buf[0] < 0x10) { av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]); /* unscramble the header bytes with a XOR operation */ for (i = 1; i < header.header_size; i++) header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1]; header.compression = header_buffer[0]; header.deltaset = header_buffer[1]; header.vectable = header_buffer[2]; header.ysize = AV_RL16(&header_buffer[3]); header.xsize = AV_RL16(&header_buffer[5]); header.checksum = AV_RL16(&header_buffer[7]); header.version = header_buffer[9]; header.header_type = header_buffer[10]; header.flags = header_buffer[11]; header.control = header_buffer[12]; /* Version 2 */ if (header.version >= 2) { if (header.header_type > 3) { av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type); } else if ((header.header_type == 2) || (header.header_type == 3)) { s->flags = header.flags; if (!(s->flags & FLAG_INTERFRAME)) s->flags |= FLAG_KEYFRAME; } else s->flags = FLAG_KEYFRAME; } else /* Version 1 */ s->flags = FLAG_KEYFRAME; if (s->flags & FLAG_SPRITE) { avpriv_request_sample(s->avctx, "Frame with sprite"); /* FIXME header.width, height, xoffset and yoffset aren't initialized */ return AVERROR_PATCHWELCOME; } else { s->w = header.xsize; s->h = header.ysize; if (header.header_type < 2) { if ((s->w < 213) && (s->h >= 176)) { s->flags |= FLAG_INTERPOLATED; avpriv_request_sample(s->avctx, "Interpolated frame"); if (header.compression >= 17) { av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression); if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable)) select_delta_tables(s, header.deltaset); if ((header.compression & 1) && header.header_type) sel_vector_table = pc_tbl2; else { if (header.vectable > 0 && header.vectable < 4) sel_vector_table = tables[header.vectable - 1]; else { av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable); if (compression_types[header.compression].algorithm == ALGO_RGB24H) { new_pix_fmt = AV_PIX_FMT_RGB32; width_shift = 1; } else new_pix_fmt = AV_PIX_FMT_RGB555; // RGB565 is supported as well s->w >>= width_shift; if (s->w != s->avctx->width || s->h != s->avctx->height || new_pix_fmt != s->avctx->pix_fmt) { av_frame_unref(s->frame); s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 }; s->avctx->pix_fmt = new_pix_fmt; if ((ret = ff_set_dimensions(s->avctx, s->w, s->h)) < 0) return ret; av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int)); /* There is 1 change bit per 4 pixels, so each change byte represents * 32 pixels; divide width by 4 to obtain the number of change bits and * then round up to the nearest byte. */ s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3; if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable)) { if (compression_types[header.compression].algorithm == ALGO_RGB24H) gen_vector_table24(s, sel_vector_table); else if (s->avctx->pix_fmt == AV_PIX_FMT_RGB555) gen_vector_table15(s, sel_vector_table); else gen_vector_table16(s, sel_vector_table); /* set up pointers to the other key data chunks */ s->mb_change_bits = s->buf + header.header_size; if (s->flags & FLAG_KEYFRAME) { /* no change bits specified for a keyframe; only index bytes */ s->index_stream = s->mb_change_bits; } else { /* one change bit per 4x4 block */ s->index_stream = s->mb_change_bits + (s->mb_change_bits_row_size * (s->avctx->height >> 2)); s->index_stream_size = s->size - (s->index_stream - s->buf); s->last_deltaset = header.deltaset; s->last_vectable = header.vectable; s->compression = header.compression; s->block_width = compression_types[header.compression].block_width; s->block_height = compression_types[header.compression].block_height; s->block_type = compression_types[header.compression].block_type; if (s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n", s->last_deltaset, s->last_vectable, s->compression, s->block_width, s->block_height, s->block_type, s->flags & FLAG_KEYFRAME ? " KEY" : "", s->flags & FLAG_INTERFRAME ? " INTER" : "", s->flags & FLAG_SPRITE ? " SPRITE" : "", s->flags & FLAG_INTERPOLATED ? " INTERPOL" : ""); return header.header_size;