static av_cold int mov_text_encode_init(AVCodecContext *avctx) { /* * For now, we'll use a fixed default style. When we add styling * support, this will be generated from the ASS style. */ static const uint8_t text_sample_entry[] = { 0x00, 0x00, 0x00, 0x00, // uint32_t displayFlags 0x01, // int8_t horizontal-justification 0xFF, // int8_t vertical-justification 0x00, 0x00, 0x00, 0x00, // uint8_t background-color-rgba[4] // BoxRecord { 0x00, 0x00, // int16_t top 0x00, 0x00, // int16_t left 0x00, 0x00, // int16_t bottom 0x00, 0x00, // int16_t right // }; // StyleRecord { 0x00, 0x00, // uint16_t startChar 0x00, 0x00, // uint16_t endChar 0x00, 0x01, // uint16_t font-ID 0x00, // uint8_t face-style-flags 0x12, // uint8_t font-size 0xFF, 0xFF, 0xFF, 0xFF, // uint8_t text-color-rgba[4] // }; // FontTableBox { 0x00, 0x00, 0x00, 0x12, // uint32_t size 'f', 't', 'a', 'b', // uint8_t name[4] 0x00, 0x01, // uint16_t entry-count // FontRecord { 0x00, 0x01, // uint16_t font-ID 0x05, // uint8_t font-name-length 'S', 'e', 'r', 'i', 'f',// uint8_t font[font-name-length] // }; // }; }; MovTextContext *s = avctx->priv_data; avctx->extradata_size = sizeof text_sample_entry; avctx->extradata = av_mallocz(avctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE); if (!avctx->extradata) return AVERROR(ENOMEM); av_bprint_init(&s->buffer, 0, AV_BPRINT_SIZE_UNLIMITED); memcpy(avctx->extradata, text_sample_entry, avctx->extradata_size); s->ass_ctx = ff_ass_split(avctx->subtitle_header); return s->ass_ctx ? 0 : AVERROR_INVALIDDATA; }