static int bmp_parse(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size) { BMPParseContext *bpc = s->priv_data; uint64_t state = bpc->pc.state64; int next = END_NOT_FOUND; int i = 0; *poutbuf_size = 0; restart: if (bpc->pc.frame_start_found <= 2+4+4) { for (; i < buf_size; i++) { state = (state << 8) | buf[i]; if (bpc->pc.frame_start_found == 0) { if ((state >> 48) == (('B' << 8) | 'M')) { bpc->fsize = av_bswap32(state >> 16); bpc->pc.frame_start_found = 1; } } else if (bpc->pc.frame_start_found == 2+4+4) { // unsigned hsize = av_bswap32(state>>32); unsigned ihsize = av_bswap32(state); if (ihsize < 12 || ihsize > 200) { bpc->pc.frame_start_found = 0; continue; } bpc->pc.frame_start_found++; bpc->remaining_size = bpc->fsize + i - 17; if (bpc->pc.index + i > 17) { next = i - 17; state = 0; break; } else { bpc->pc.state64 = 0; goto restart; } } else if (bpc->pc.frame_start_found) bpc->pc.frame_start_found++; } bpc->pc.state64 = state; } else { if (bpc->remaining_size) { i = FFMIN(bpc->remaining_size, buf_size); bpc->remaining_size -= i; if (bpc->remaining_size) goto flush; bpc->pc.frame_start_found = 0; goto restart; } } flush: if (ff_combine_frame(&bpc->pc, next, &buf, &buf_size) < 0) return buf_size; if (next != END_NOT_FOUND && next < 0) bpc->pc.frame_start_found = FFMAX(bpc->pc.frame_start_found - i - 1, 0); else bpc->pc.frame_start_found = 0; *poutbuf = buf; *poutbuf_size = buf_size; return next; }