static int write_extradata(FFV1Context *f) { RangeCoder *const c = &f->c; uint8_t state[CONTEXT_SIZE]; int i, j, k; uint8_t state2[32][CONTEXT_SIZE]; unsigned v; memset(state2, 128, sizeof(state2)); memset(state, 128, sizeof(state)); f->avctx->extradata_size = 10000 + 4 + (11 * 11 * 5 * 5 * 5 + 11 * 11 * 11) * 32; f->avctx->extradata = av_malloc(f->avctx->extradata_size); ff_init_range_encoder(c, f->avctx->extradata, f->avctx->extradata_size); ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8); put_symbol(c, state, f->version, 0); if (f->version > 2) { if (f->version == 3) f->minor_version = 4; put_symbol(c, state, f->minor_version, 0); } put_symbol(c, state, f->ac, 0); if (f->ac > 1) for (i = 1; i < 256; i++) put_symbol(c, state, f->state_transition[i] - c->one_state[i], 1); put_symbol(c, state, f->colorspace, 0); // YUV cs type put_symbol(c, state, f->bits_per_raw_sample, 0); put_rac(c, state, f->chroma_planes); put_symbol(c, state, f->chroma_h_shift, 0); put_symbol(c, state, f->chroma_v_shift, 0); put_rac(c, state, f->transparency); put_symbol(c, state, f->num_h_slices - 1, 0); put_symbol(c, state, f->num_v_slices - 1, 0); put_symbol(c, state, f->quant_table_count, 0); for (i = 0; i < f->quant_table_count; i++) write_quant_tables(c, f->quant_tables[i]); for (i = 0; i < f->quant_table_count; i++) { for (j = 0; j < f->context_count[i] * CONTEXT_SIZE; j++) if (f->initial_states[i] && f->initial_states[i][0][j] != 128) break; if (j < f->context_count[i] * CONTEXT_SIZE) { put_rac(c, state, 1); for (j = 0; j < f->context_count[i]; j++) for (k = 0; k < CONTEXT_SIZE; k++) { int pred = j ? f->initial_states[i][j - 1][k] : 128; put_symbol(c, state2[k], (int8_t)(f->initial_states[i][j][k] - pred), 1); } } else { put_rac(c, state, 0); } } if (f->version > 2) { put_symbol(c, state, f->ec, 0); put_symbol(c, state, f->intra = (f->avctx->gop_size < 2), 0); } f->avctx->extradata_size = ff_rac_terminate(c); v = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0, f->avctx->extradata, f->avctx->extradata_size); AV_WL32(f->avctx->extradata + f->avctx->extradata_size, v); f->avctx->extradata_size += 4; return 0; }